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home > Web Design Tutorials > Programming Tutorials > Javascripting Articles > Javascript Interacting with Forms Coding Tutorials

ARTICLES & TUTORIALS FOR FORMS PROGRAMMING in JAVASCRIPT: Learn about Development of Forms in Javascript, such as Interacting with Forms, Checkbox Objects, Uploading Files in Forms, Hidden Objects, Passwords, Form Validation, Multiple Emails and more.

JavaScript Form Object
Form is a property of the document object. This corresponds to an HTML input form constructed with the FORM tag. A from can be submitted by calling the JavaScript submit method or clicking the form submit button.

JavaScript Button Object
This object is a property of the form object. Button FORM syntax is…

JavaScript Checkbox Object
This object is a property of the form object. Checkbox FORM syntax is…

JavaScript FileUpload Object
A property of the form object which allows users to provide a local file as part of their form input thereby allowing for indirect file upload. It can be implement using a form as follows…

JavaScript Hidden Object
A property of the form object. Hidden object FORM syntax is…

JavaScript Option Object
This object is a property of the form object. It is one of several options in a selection box. It appears inside a select box as follows…

JavaScript Password Object
This object is a property of the form object. Password FORM syntax is…

JavaScript Radio Object
This object is a property of the form object. Radio button FORM syntax is…

JavaScript Reset Object
This is a property of the form object. An example is…

JavaScript Select Object
A property of the form object. The Option object(s) appear inside it as in the following code…

JavaScript Submit Object
Submit Object: A property of the form object. Example code…

JavaScript Text Object
Text Object: A property of the form object. Example code...

JavaScript TextArea Object
A property of the form object. Textarea syntax is...

Using JavaScript To Control Forms: Part 1
This article explains some of the JavaScript techniques that can be used to improve HTML forms. There are many techniques, mainly based on validating form fields, including checking that a field has been filled in, and that it contains the right kind of d

Using JavaScript To Control Forms: Part 2
The second part of our series on using JavaScript to improve the quality of forms looks at one final aspect of 'required' fields, the Select element. It also covers Regular Expressions that can be used to limit the kind of characters accepted in a field

 

Using JavaScript to Control Forms: Part 3
The three techniques discussed in this final article have a common theme. They are all concerned with presenting forms, rather than validating form input. The first section looks at adding extra emphasis to form elements. We then look at intelligent forms

JavaScript and Forms
The FORM tag is usually used to create forms for sending to CGI scripts or other server-based software, but there's a lot that can be done at the browser end as well - with JavaScript! You can validate the data entered by the user before it's sent to the

Forms Validation
Forms validation is a very useful aspect of JavaScript. It can be used to check over a given form and if it finds any problems, such as a blank input box or an invalid e-mail address, it can notify the user and not waste time sending it to a server. Aside

Forms: Agree Before Entry
JavaScript will only let you enter your name in this form if you indicate you agree to the terms by first clicking the I Agree radio button. If you agree, you can enter your name. But, if you disagree, you will not be able to enter or edit your name. When

Check for Maximum Number of Charactors
Verifies that the number of charactors being submitted is less that a certain length.

Country Chooser
This JavaScript allows users to select a world region and then a second pulldown menu changes with the countries in that particular region.

HTML Check
This JavaScript checks to see if any HTML tags are used in a text area form box. If they are found, they are deleted.

Item Pad
This Javascript will store list of several items you enter. Just enter an item and click 'Add to List'. When you are finished, click 'Show List' to see the entries.

Multi Emailer
This JavaScript will send an e-mail to anyone on your "list". Just use the pulldown menu to select a recipient, compose your message, and hit 'Send Message' to send it.

Name and Age Check
This JavaScript checks to see if the name and age for a form contain valid charactors.

URL Loader
Type in a URL and hit the button, this script will load the URL for you.

Beginning With Forms
How to access your form elements with javascript…

Forms, Events and Dialog Boxes
This lesson introduces you to the use of Forms, Events and Dialog boxes in JavaScript. As you will find out, Forms are constantly used in JavaScript. Carefully read the paragraph of Events and work though the related assignment to learn about Events, a pa

Email Address Validation Script
Scan email addresses to make sure that the email address entered into the textbox contains valid characters.

Combo Jump Script
This script allows you to display a list of site titles in a combo box and allows the user to select one and go to it.

Dynamic Title Adding Script
This script lets a visitor change a piece of text on your page.

Input Box Restrictions
This form validation JavaScript restricts the number of characters allowed inside an input field. Great for preventing people from overloading the form.

Parse Number to Currency Format
This is a handy script for forms that contain money values. It automatically parses the form element of your choice whenever a surfer enters a number into the standard currency format.

Select All Script
This script selects all the content in a scrolling textbox.

Select One 2
This scripts demonstrates how I limited only one selection by deselecting all others and how you can retrieve the value of the box you are selecting.

Field Clear Script
This script clears a text box when it is clicked on.

FormCheck
FormCheck is a generic script which will check and verify that mandatory fields are filled in before form submission. If one or more of the required fields are empty. A popup dialog will appear showing the omitted fields.

Auto Greeting
You can put this in your web page to greet your site visitors according to their local time.

Auto Text Converter
This script will automatically and repeatedly write text into a input field.

Calling Functions With Forms
The purpose of this example is to introduce you to forms and JavaScript. This script uses a form to allow you to choose a background color, either blue or pink. Notice that the color selection is done through form buttons.

Putting it all together: Form Field Validation
This example brings us back to forms. The program will use JavaScript to validate a user's data entry, which is often sloppy. In this example we will make the user enter a first name and we will require a zip code to be either 5 or 10 characters in length

Form Validation
Javascript is a strong tool for validating forms before sending the content. The most obvious things to check for are whether an emailaddress has valid syntax, or if fields meant for values have text entered, etc.

Form Validation:The Technique
The javascript to validate inputs to a form consists of four different functions…

 

Form Validation: The Code
The script explained on this page actually consists of the four functions listed below…

Form Validation: Example
If you want to use all four validation scripts and the script that will check all fields at once, feel free to copy the entire code listed below to your page.

Preventing Multiple Form Submits
Forms on Web sites are a handy way to get information from your visitors. However it's easy for a visitor to accidentally send more than one copy of a form by clicking on the form's "submit" button more than once…

Form Validation with JavaScript
This tutorial will show you how to create a JavaScript-enabled form that checks whether a user has filled in the form correctly before it's sent to the server. This is called form validation…

JavaScript and Forms
The FORM tag is usually used to create forms for sending to CGI scripts or other server-based software, but there's a lot that can be done at the browser end as well - with JavaScript! You can validate the data entered by the user…

Accept Terms
This Script allows your visitors or customers to accept your terms and conditions before proceeding by ticking a Check Box. If they don't agree, an exit box on the form takes them back to the home page.

Adding HTML Controls
Use this script to add HTML controls to your forms. This example uses the tag.

Adding Options
Use this script to add or change options on a form select menu. Clean and simple. Includes comments.

AIM Message
Send messages to anyone using AOL Instant Messenger. Cool!

All Lower Case
Converts a textbox entry to all lowercase letters as soon as they move to the next item in the form (or click the submit button).

All Upper Case
Converts a textbox entry to all capital letters as soon as they move to the next item in the form (or click the submit button).

Anywhere Mail
This is a neat little JavaScript button that will help you to e-mail anyone. Just click 'E-Mail Someone!' and JavaScript will ask you for the necessary information - e-mail address, subject, etc. Then, a new mail message is opened for you.

Auto Currency
Inserts the proper seperators to automatically format any currency field.

Auto Drop Down
Automatically adjusts the values in the selection box depending on the item selected in the drop down menu.

Auto Email Link
Automatically opens a new e-mail using your default e-mail client and fills in the subject line and body with the address of the current web page.

Auto Fill
Set a text field value in one window by entering text in another window.

Auto Month
This pulldown menu will automatically adjust the range of months so that the current month is at the top. The remaining months are placed in order after the current month.

Auto-Sum Form Boxes
This script will automatically total boxes in a form. Use this to keep a running total of quantites or prices in an order form.

Auto Tab
Automatically sets focus to the next form element when the current form element's maxlength has been reached. This way, the user does not have to manually click in or tab to the next field. This script is perfectly suited for constant-length strings such

Auto Year
This pulldown menu will automatically adjust the range of years depending on the current year. As an added bonus, the range is easily modified.

Basic Validation
The simplest way to require visitors to fill out certain fields is to us this script - just add the word "required" to each required field's name and your visitor must fill it out to submit the form!

Binary Operators and CheckBox
This script is a good example of the use of binary operations with check boxes to obtain a single number which is the binary representation of the selected check boxes. There is also a button to show you your selections in text form.

Bitmap & Object Script
This example demonstrates the use of bitmasking to store values in a single variable and how to use objects with JavaScript.

Block Key Press
Using the OnKeypress event, you can trap and prevent certain characters (repesented by ASCII decimal codes) from being entered in a form field. Just look up the ASCII code for any other characters you wish to block and add it to the script.

Block Key Press 2
Tired of customers using characters that could possibly render your forms useless. This script prevents a form user from adding certain special characters in the character fields. Now works in most browsers.

Category Form Script
When an item from the first menu categories are selected a different set of items in the second menu are loaded.

Category Selection
After choosing a main category, a subcategory opens in a popup select menu. The final selection will be shown in a read-only text field. IE only.

Character Counter
Use this script to limit the number of characters allowed in an input box. It will count the number of characters left in the box and display it below. Easy to modify.

Check All
Dynamically checks and unchecks all the checkboxes in a form when a button is clicked. Much easier than manually hard-coding the checkbox names, for sure. Updated to only require one button to check and uncheck all boxes.

Check by Group
By utilizing a dropdown box, a user can check groups or subgroups of checkboxes.

Check Cap Locks
If a user enters his password in a Web-based form with Caps Lock accidentally on, he can become frustrated because his password is not being accepted…

Check Entry
Prevents the user from selecting a filename with a space (known to cause problems with some CGI-scripts). The visitor are informed that the field can not have spaces…

Check Form
This form validation script will place a check in the checkbox next to a textbox in a form if the enty is valid. Includes basic form validation. Cool!

Checkbox Changer
Takes a series of known named checkboxes and checks or uncheck them all at once. It can even change each checkbox to the opposite checked or not checked value.

Checkbox Counter
Easily count the number of checkboxes that have been selected.

Checkbox Text
The user no longer needs to click precisely on the checkbox to check and uncheck it. Clicking the text after a checkbox can do this just like windows programs.

Checkbox Text
The user no longer needs to click precisely on the checkbox to check and uncheck it. Clicking the text after a checkbox can do this just like windows programs.

Commas
Quickly add commas to any numerical form input. Great for displaying large numbers…

Confirmable Order Form
Your order has been submitted. If you entered your email address, it will arrive shortly. The source code for the order form, the confirm page, and the thanks page are included below.

Copy Contact Info
This script lets users enter there information & copy it to a different form on the same page.

Controlled Boxes
This script allows checkboxes to check and uncheck based on the selection in another checkbox. If the ALL box is checked, all the other choices go unchecked…

Cookie Form Saver
This script uses cookies to save information from a form and repopulate the form the next time the user visits. Works in MSIE, Netscape, and Opera.

Copy Fields
Allows the user to click a checkbox on a form to duplicate information. For example, they can copy their billing information into the shipping information fields…

Copy Name
Allows the user to enter their name in the first field and have copies it to the second field for use as the User ID. It occurs instantly when they click the next field or the submit button…

Country Chooser
If you'd like to know where visitors to your site live, add this to your feedback forms. They just choose a region, and the second menu changes appropriately, allowing them to choose their country…

Currency Format
This script accepts a number or string and formats it like U.S. currency. Adds the dollar sign, rounds to two places past the decimal, adds place holding zeros, and commas where appropriate. Occurs when the user clicks the button or when they finish enter

Customized Window
Use JavaScript to allow visitors to open a customized window. I've used this script in the past to find the exact window size I want a JavaScript function to open.

Day Menu
Do you need your visitors to select a day from this month? Here's an excellent way to do so - they get a pulldown menu containing the entire month and the current day is already selected! Cool!

Date Selection Form
This handy script lets you auto-generate the day and year in a drop down selection as well as validate the date. Add it to your pages that require date validation.

Date Sorter
This script will sort an array of dates with the month spelled out. It is done by converting the date into a more manageable format.

Decimals Allowed
Allows the user to enter a number with up to 2 decimal places in a text box. In other words, 99 is ok, 99.9 is ok, 99.99 is ok, but 99.999 is rejected. You can easily change the number of decimal places that are permitted…

dFilter
This script will easily allow you to add an input mask to a textbox. The mask for a phone number could look like this for example…

Dictionary
This script defines English words. You put in the word. It gives you the definition. Easy enough! It also includes a thesaurus.

Disable Form Controls
Here's a simple form that contains a check box and a text box. Unless the check box is activated, you won't be able to enter anything into the text box.

Disable Submit
When the form is submitted, any submit and reset buttons are disabled. This prevents the user from submitting the form repeatedly, whether by accident or on purpose. The form will just act normally for Netscape users.

Dropdown Box Population
This series of dropdown boxes are automatically populated with choices based on the first dropdown box.

Dynamic Input
Offer a form with as many input boxes that the user selects. After entering the number of boxes, the form is dynamically updated while the rest of the form remains untouched.

Dynamic Table
Enter information into this dynamic table and see the power of W3C-DOM compatible browsers.

Email Address Validation
This is an e-mail address validation function. It allows the usual…

E-mail Address Validation2
This script verifies the given value as a possible valid e-mail address.

E-mail Director
Use a button or link to send e-mail using the visitor's e-mail program.

Email Domain
Takes an email address and returns just the domain - the stuff after the "@" sign. We've put it together with a simple WHOIS query…

E-Mail This Page
Let your visitors e-mail your Web pages to their friends.

Email Validation Basic
This is a simple e-mail address validation script. While it is not too sophisticated, it does provide the basic validation function.

Encode Special Characters
When submitting the form "GET" method, JavaScript can encode special characters with the escape() function…

Enter Key Focus
Form users can move to next text field by pressing the enter key, same as if you were to press the TAB key.

FilterList
Finding one item in a long list can be daunting task. Enter FilterList, with this script you can sort the items alphabetically.

First Form Field
This script places the cursor in the first field of a form when the page loads and when the form is reset or cleared. The script works with input types: text, textarea, radio, checkbox, password and Select drop-down boxes.

Expanding Textbox
Automatically expands the size of a textbox to fit all of the entered text. Internet Explorer Only.

Extended Characters
Having trouble remembering the extended character codes? It's now as easy as a press of a button.

External JS
Using an external JavaScript file, simply define the rules for how each field should be validated and you're set. Piece of cake! And since it is it's own .js file, it's easy to use the code on every page of your site…

Extract Email Addresses
Visitors sometimes include their email address inside the message field when they fill out forms…

Field Explanation
Opens an explanation window to explain the various fields used in a form on your site when the help link is clicked…

Field Focus
A simple and small script to place focus on any form element you want when a page loads.

Field Show
Use radio buttons to display a field for your users to add input to your forms.

File Open
This script allows someone to choose a file on their hard drive and open it. Now cross-browser compatible.

Form Field Help
Add a help link to each section in your form. When clicked, an explanation is given of what is required and a box is offered where the information can be entered and transferred to the form.

Form Acknowledgement Page
This page is called by a Javascript function. The purpose is to inform the visitor that their input has been successfully recorded. A button is provided to enable the visitor to close the window for this page and return to the page that created it.

 

Form Focus
Places the focus on the first editable field in a form on any web page.

Form Target Formatting
Allows you to format the target window of a form from the form's target property. This allows for the use of window properties, variables, and other data manipulation to effect these options.

Form Screener
Don't want a certain person to fill out a form? Using this script, those people will be rejected after they put their name in.

Format Date
Automatically formats date fields as the user enters the information. Also validates the date when complete date has been entered.

Format Input
Format the text case inside a form, reverse the text, or see the ASCII code behind the input.

Format Phone Number
This script will format a telephone number entered into a text box…

HTML Preview
Preview HTML in a new window by entering it into the form. This script allows you to pass anything to a new window.

Ignore Spaces
Removes spaces from a string variable within a script or from user input into a text box. Several different uses are shown on the script example page.

Ignore Spaces
Removes spaces from a string variable within a script or from user input into a text box. Several different uses are shown on the script example page.

Image Upload Preview
This script is intended for forms where the user needs to upload an image to a Web site. The image is displayed on the page for previewing before uploading…

Initial Caps
Converts the first letter of each word in a string that the user enters to uppercase. The remaining letters of each word are also changed to lowercase…

isCurrency
This function will take a string value and break it apart and check for valid US currency values. If the string is a valid US currency value the function will return true. If the function encounters an error while validation the function will display a er

Items List
Javascript can remember a list of several items you enter. Just enter an item and click 'Add to List'. When you are finished, click 'Show List' to see the entries.

Items Popup List
If you have several items for the user to pick from, you may notice that your page can quickly becomes cluttered. This script helps solve that problem by opening a new window when the user wants to add items to the list.

Limit Textarea
This script controls a maximum textarea input amount and updates a small counter with how many characters are left with each keystroke. Dynamic fix now allows you to use this script in multiple textboxes on a page.

Locked Textbox
Prevent your visitors from modifying the value stored in a textbox (without using input type=hidden) Just try to change the text in the box! Amazingly, it's a short less than one line script!

Limit Boxes
Limits the number of checkboxes that the user is able to check on your site. Ideal for situations when more than one selection is allowed up to a certain number overall.

Line Wrapper
Wraps entries in a textarea box to whatever number of characters per line you want. For example, The script can automatically insert a return after each 50 spaces, so that the form contents you receive are more readable.

List Chooser
The user can immediately locate what he has been searching for in the long options list just by typing. With each character the user types in the text field, the available items listed are narrowed down (similar to a help file's index feature)…

List Organizer
Easily organize a list of values to place them in any order. Allows you to add and delete from the list.

Mail: Pick Subject
Use JavaScript to help organize your visitor e-mail. Visitors pick from several predetermined subjects the most appropriate subject for their e-mail. Visitor are also prompted to reenter information for incomplete or invalid entries…


Mailing List
Use JavaScript to sign up visitors for your mailing list. Once again, JavaScript ensures that the visitors have filled out the form completely and correctly. Visitors area also prompted to reenter any incomplete or invalid entries.

Max Entry
Make sure your visitor doesn't exceed the maximum number of characters that you want to accept in a form.

Memory Cells
Need to save values from a text field off to the side to free up a form for another calculation? This JavaScript lets you do just that…

Menu Swapper
Move selected items from one list box to another using "<<" and ">>" direction buttons. It works like database field selection, supports selecting multiple items, and even can sort the moved item into the new list.

Money Filter
Removes the dollar sign ($) and commas (,) from a a text box. Useful if you require input of only numbers. You may also modify the script to filter out whatever characters you want.

Multi-Date Picker
This script allows you to simply pick dates by clicking the date of the dynamic calendar. Users can cancel their selection by re- clicking the date you have selected. The dates you picked will show on the textarea beside the calendar.

Multiple Mailer
JavaScript can help you send an e-mail to anyone on your "list". Just use the pulldown menu to select a recipient, compose your message, and hit 'Send Message' to send it. This too, is another good JavaScript example for all beginners to learn from.

Multiple Search Engine
Over 70 popular and unusual internet search engines in a drop down box. Great little tool to add to a site to help your community grow.

No Duplicates
Prevents you from selecting the same choice when choosing from two different pulldown menus.

No Entry
Use JavaScript to ensure that visitors do not leave a form entry blank. If they do, they are prompted to complete it before they can continue.

No HTML
Use JavaScript to ensure that visitors do not type in HTML entries.

One Check
Only allow one box to be checked out of any number of boxes. Handy for quizzes, etc.

Only One Field
The visitor must fill in either one of two fields, their name or email address. If they click in either box the other box's value is erased. Ensures that when the form is submitted only one field contains a value.

Open Link
Add the option of allowing links on your page to be opened in a new window with this powerful script. A simple checkbox toggles between the current and new window.

Option Search
Allows you to jump to any value in a drop down list. In our example, search for a value between 'a1' and 'a15'. Saves time when it comes to navigating within long pull down menus.

Order Form
An order form which utilizes checkboxes and radio buttons for making a selection. The checkbox only allows one quantity of any item to be ordered, while the radio button only allows for one item within a defined group to be ordered…

Parse Text
Quickly and easily convert text into a JavaScript string.

Pass Multiple Values
Values selected from the drop-down box appear in the text area below. As more items are selected they are added to the list.

Pass Textbox (in frames)
Copies the text in a box in the left frame into a box in the right frame when the button is clicked. A clever way to pass values in frames.

Passing Values (Source)
Here is a clever way of 'unwrapping' the contents of a form when passed from one page to the next. This capability would be useful in many situations, such as passing the contents of a form to another page, retaining information about the current page for

Password Verifier
Keep your visitors from submitting their form until their "password" and "re-enter password" fields match, for verification purposes. They get an error message telling them to re-enter the passwords if they do not match.

The Picklist Script
This little snippet is a picklist. Add it to your forms to move selections from one column to another.

Popup Picker
Select an item from the list and the selected value is passed to the form field of the original window, and the pop-up closes automatically.

Radio Buttons
Tired of the same old ugly radio buttons in your forms? Try this short script.

Radio Question Validator
This script validates that every Radio Button question on the form has been answered. No modifications needed! Please hit the back button after radio button verification…

Remove Returns
Converts carriage returns in a string to the tag so that the input can be properly displayed in HTML. Without the script, returns in an input field are not preserved when submitting in a form. Useful for guestbooks or other times when a user's input must

Remove_XS_Whitespace
Strips excess spaces from a field. Users sometimes enter " " in required fields to trick most validation that only checks for "" length fields…

Rank 'em
Create a survey asking people to rank things, and this script will validate that everything is ranked, and no rankings are repeated.

Replace Characters
Replaces a character or multiple characters in a textbox when the visitor goes to the next field (or in this example, clicks the submit button).

Required Fields
Checks form fields to verify that each specified field is not left empty. Displays a warning message if any empty fields are present.

Resize Form Elements
Tired of making all those beautiful, complex HTML forms, only to have them be destroyed when switching between browsers? This script eliminates the frustration by dynamically up-sizing the form elements in Internet Explorer by a specified percent.

Return Key Disable
This script prevents the "early submitting" of forms by disabling the Return Key in simple Input Tags and allowing it in TextAreas…

Search Box
This JavaScript search form opens a seperate window where you can select from search engines such as Yahoo!, Excite, and more.

Select All
Select the text from any form with the click of a button, just as used on the JavaScript Source.

Select and Auto Copy
With this script you can highlight and copy text in a textarea box with the click of a button.

Select One
Limits the number of checkboxes a user may click by deselecting the others upon selection.

Selection Box
Copy items from one selection box to a second selection box. Selected item values are stored as a string for further manipulation, such as submitted through a form, an alert box, etc.

Selection Order
Adjust the order of the items in a selection box and submit them in that order.

Sentence Caps
Use Javascript to convert entries to sentence caps. Also, this script prevents jokers from typing in all caps. In the past, I have used this script to convert guestbook entries to sentence caps.

Single Click for Multiple Boxes
This script offers your users the ability to check or uncheck multiple boxes on a form.

Smart Pulldown Menu
Uses cookies to let a dropdown list remember which option was chosen when a user returns to the page. It comes in very handy if you have a page that is frequently accessed and users tend to repeatedly chose the same option from a list.

Smut Engine
Use JavaScript to ensure that forms submissions to do not contain words you don't want. It can eliminate dirty words or competitors' names, whatever you want.

Spaces to Plus Symbol
Replaces single or multiple spaces in a text box entry with plus (+) symbols. Handy if your server's form processing or database management program requires this type of encrypted format.

Strip Characters
Strips the characters from an input string. You can change the characters you want removed from the string by changing one line of code.

Submit Changer
Changes the caption of the form's submit button while the form is being submitted. This helps eliminate the confusion that can sometimes occur when a form takes quite a while to be processed by the server.

Submit Link
Now you can easily use text or an image as a submit button…

Submit Once
Do you ever receive multiple copies of a single form submission? Do your visitors click the submit button over and over, hoping it will hurry up the process? Well, JavaScript can solve your problems! The script will prevent the visitor from submitting the

Submit Once for FrontPage
A script that only allows the user to submit a form once. Compatible with Microsoft FrontPage's built-in validation methods, which other 'Submit Once' scripts are not. It spoofs FrontPage by dynamically re-writing the onSubmit handler in the user's browse

Suggestions
Use JavaScript to allow visitors to send your feedback.

Tab Key Emulation
The tab key is no longer required to tab between fields. The user can go to the next form field just by pressing the enter key instead of the tab key. Useful with 10-key form input.

TextBox Expander
I get annoyed when I'm trying to fill in a form and I have to scroll left or right to see what I've typed. This little script puts an end to that. The amazing expanding text box!

Text Cycler
Use the Up and Down arrows while in the text box to cycle through your choices. InternetExplorer users can go up and down through the list, Netscape users can only go down through the list.

Text Reverser
JavaScript will take the contents of a box and reverse it! If you entered 'hello' it will change the box to say 'olleh'. This might be useful on your site in a form or just for fun.

Tigra Form Validator
Tigra Form Validator is free JavaScript component performing client side form validation. With this feature set the script can be used with HTML forms of virtually any complexity.

Time Out
Limit the time allowed for form input with this short script.

Trim Leading Spaces
A super-easy script which eliminates any extra leading spaces entered inside a textbox. To check it out in action, try entering a few spaces before the text in the box.

Trim Trailing Spaces
A super-easy script which eliminates any extra trailing spaces entered inside a textbox. To check it out in action, try entering a few spaces after the text in the box.

True Date Selector
This script helps to insure the integrity of the date entered in drop-down menus. Dates…

UK Postcode Validation
Checks that postcodes are in correct format. Is written for UK format, but is easily adapted for other countries.

Upload Filter
Allowing visitors to upload files through web forms on your site is useful, but how do you limit the types of files they can upload? This script only allows visitors to upload files that end with the file extensions you want, such as .gif and .jpg, etc.

User Management
Use this script to add and subtract items in different fields. Changes made can be displayed for each field.

Validate Date
This is a simple date validation. The script is written for the European format (ddmmyy), but can easily be changed.

Validation
Let Javascript help you receive feedback from your visitors. The script also requires that all fields must be completed before the form is submitted.

Validation (Character)
Automatically removes specified characters from input box. Good for fields that require only text/number inputs. Easily modified to accept only text or only numerals.

Form Validation
Use JavaScript to ensure that all elements of a form are properly filled out before they can be mailed to you. This definitely saves me from getting a lot of junk mail....

Credit Card Validation
Validates a credit card number the user enters based on the rules of that card such as the value of first digit, the number of digits, as well as several other computations. Useful for online order form validation.

Validation (Date)
Dates are validated and formatted in your form. Supports over a dozen different date formats, and formats the date properly in United States or European date formatting styles depending on how the script is configured. A dateCheck function also is include

Validation (Universal Date)
Validate dates in your form using this universal script. Will work with any date format and the code is fully commented for easy modification.

Guestbook Validation
Use JavaScript to ensure that all elements of a guestbook are properly filled out before mailing.

Information Validation
Test the powers of JavaScript. Watch as JavaScript tells you if information about you is valid or not.

Sort Data Table
Click on the column headings to sort the information in the table. IE 5+ only.

Validation (IP Address)
Verify the value of an IP address. Check for special cases such as…

Validation (No Alert)
Stop displaying those annoying alert boxes with your JavaScript form validation…

Validation (Num. or Chars)
Validates an input field to make sure that only a number or character is entered. If you enter a number or a letter everything you can continue on…

Validation (password)
This script works like our Password Verifier, however, it also checks for a minimum length and invalid characters.

Select Validation
Use JavaScript to ensure that visitors choose both a radio button and a checkbox. Invalid submissions are cancelled.

Validation (SSN)
Input the Social Security Number using either the 9 digit or NNN-NN-NNNN format. The number ranges can be easily changed by the S.S.A, so this is not checked.

Time Validation
This function verifies that a string is a valid time, in the form hh:mm:ss am/pm, where seconds are optional. It accepts military time (hour between 0 and 23) as long as am/pm isn't specified. It requires am/pm when the hour is less than or equal to 12.

Zip Code Validation
Ensure that your visitors enter a properly formatted 5 digit, or 5 digit+4 zip code. The visitor is alerted if any information is invalid and asked to try again.

Word Count
Finally, an easy way to count the number of words that are entered into a form!

Word Counter
This is a handy script that counts the words (or characters) entered into a textarea and limits it to 100 words or less (this can be changed).

Word Filter
This form validator filters pre-selected words in a text box. When the user submits text, the validator will check the words against the list of banned words.

Zip to State
Enter your five digit zip code and press tab to have the script display your state automatically.

Resizing Window
Use the arrow keys to resize the window. (Frames not supported) IE only.

Functionx - JavaScript and Forms
A form is a section of a web page that contains one or a group of objects that the user interacts with. These objects are referred to as Windows controls, web controls, or simply controls…

Manipulating the Value of a Text Field
The example of javascript, changes the Value of a Text Field when the mouse is over…

Text Field Events
Text fields understand onBlur, onFocus, and onChange. The onFocus event occurs when someone clicks inside a text field…

Form Handlers
Forms are objects; they have their own methods, properties, and event handlers. One event handler that you should know about is onSubmit…

Checkboxes
Text fields and textareas are just two types of form elements. Others that we'll look at in this lesson are checkboxes, radio buttons, and selects. Let's discuss checkboxes first.

Radio Buttons
Radio buttons are almost exactly like checkboxes with respect to JavaScript. The only real difference is in the HTML.

Selects
Selects are the strangest of the form elements we'll cover in this lesson. There are two primary kinds, pulldown selects and list selects. Here are examples of each…

onChange in Select Form Elements
Play with this example and then read the blow-by-blow description below it…

Tizag - Javascript Form Validation
The idea behind Javascript form validation is to provide a method to check the user entered information before they can even submit it.

Simple Form Validation with the return Keyword
Here we are performing simple validation to make sure the user entered something into the text field.

Easy To Use Stock Form Validation Script
This versatile form validation script will work with any form that is configured to use it.

Validating Radio Buttons
By setting the value of the variable, "found_it" equal to the checked button's value, the original button loop script can easily find which button was checked. But what happens if no buttons are checked?

Clearing Radio Buttons
Sometimes you will need to clear only part of a form…

Select Menus and Date Object Validation
Select a month from the 1st menu and the correct number of days in that month will be displayed in the 2nd menu.

Email Address Validation Script
This sample email address validation script checks the email address for the format…

Webdevelopersnotes - Getting user input
In this session we'll look at the JavaScript prompt. The prompt() is a method of the window object, just like alert() or confirm().

Oopweb - Forms
Forms are widely used on the Internet. The form input is often being sent back to the server or via mail to a certain e-mail account…

Oopweb - Forms
In this tutorial you learn From validation example using javascript…

Reading user input
This tutorial illustrates how you can read the data entered into the form by a user. It is not necessary to submit the data to the server if you can make something with JavaScript on the client side.

The Target property
Is it possible to submit a form in new window configured specially ? Imagine a form that submits in a window containing no navigation panel.

Form Elements
All of the properties you set for form fields with HTML are programatically accessible with JavaScript, however there are just a few key elements…

Form Events
Forms are driven largely by event attributes, so we should take a look at what the major event attributes are. First, the two primary event attributes for the form are onsubmit and onreset…

Upload Filter
Allowing visitors to upload files through web forms on your site is useful, but how do you limit the types of files they can upload? This script only allows visitors to upload files that end with the file extensions you want, such as .gif and .jpg, etc.

User Management
Use this script to add and subtract items in different fields. Changes made can be displayed for each field.

Validate Date
This is a simple date validation. The script is written for the European format (ddmmyy), but can easily be changed.

Validation
Let Javascript help you receive feedback from your visitors. The script also requires that all fields must be completed before the form is submitted.

Validation (Character)
Automatically removes specified characters from input box. Good for fields that require only text/number inputs. Easily modified to accept only text or only numerals.

Form Validation
Use JavaScript to ensure that all elements of a form are properly filled out before they can be mailed to you. This definitely saves me from getting a lot of junk mail....

Credit Card Validation
Validates a credit card number the user enters based on the rules of that card such as the value of first digit, the number of digits, as well as several other computations. Useful for online order form validation.

Validation (Date)
Dates are validated and formatted in your form. Supports over a dozen different date formats, and formats the date properly in United States or European date formatting styles depending on how the script is configured. A dateCheck function also is include

Validation (Universal Date)
Validate dates in your form using this universal script. Will work with any date format and the code is fully commented for easy modification.

Guestbook Validation
Use JavaScript to ensure that all elements of a guestbook are properly filled out before mailing.

Information Validation
Test the powers of JavaScript. Watch as JavaScript tells you if information about you is valid or not.

Sort Data Table
Click on the column headings to sort the information in the table. IE 5+ only.

Validation (IP Address)
Verify the value of an IP address. Check for special cases such as…

Validation (No Alert)
Stop displaying those annoying alert boxes with your JavaScript form validation…

Validation (Num. or Chars)
Validates an input field to make sure that only a number or character is entered. If you enter a number or a letter everything you can continue on…

Validation (password)
This script works like our Password Verifier, however, it also checks for a minimum length and invalid characters.

Select Validation
Use JavaScript to ensure that visitors choose both a radio button and a checkbox. Invalid submissions are cancelled.

Validation (SSN)
Input the Social Security Number using either the 9 digit or NNN-NN-NNNN format. The number ranges can be easily changed by the S.S.A, so this is not checked.

Time Validation
This function verifies that a string is a valid time, in the form hh:mm:ss am/pm, where seconds are optional. It accepts military time (hour between 0 and 23) as long as am/pm isn't specified. It requires am/pm when the hour is less than or equal to 12.

Zip Code Validation
Ensure that your visitors enter a properly formatted 5 digit, or 5 digit+4 zip code. The visitor is alerted if any information is invalid and asked to try again.

Word Count
Finally, an easy way to count the number of words that are entered into a form!

Word Counter
This is a handy script that counts the words (or characters) entered into a textarea and limits it to 100 words or less (this can be changed).

Word Filter
This form validator filters pre-selected words in a text box. When the user submits text, the validator will check the words against the list of banned words.

Zip to State
Enter your five digit zip code and press tab to have the script display your state automatically.

Resizing Window
Use the arrow keys to resize the window. (Frames not supported) IE only.

JavaScript and Forms
A form is a section of a web page that contains one or a group of objects that the user interacts with. These objects are referred to as Windows controls, web controls, or simply controls…

Manipulating the Value of a Text Field
The example of javascript, changes the Value of a Text Field when the mouse is over…

Text Field Events
Text fields understand onBlur, onFocus, and onChange. The onFocus event occurs when someone clicks inside a text field…

Form Handlers
Forms are objects; they have their own methods, properties, and event handlers. One event handler that you should know about is onSubmit…

Checkboxes
Text fields and textareas are just two types of form elements. Others that we'll look at in this lesson are checkboxes, radio buttons, and selects. Let's discuss checkboxes first.

Radio Buttons
Radio buttons are almost exactly like checkboxes with respect to JavaScript. The only real difference is in the HTML.

Selects
Selects are the strangest of the form elements we'll cover in this lesson. There are two primary kinds, pulldown selects and list selects. Here are examples of each…

onChange in Select Form Elements
Play with this example and then read the blow-by-blow description below it…

Javascript Form Validation
The idea behind Javascript form validation is to provide a method to check the user entered information before they can even submit it.

Simple Form Validation with the return Keyword
Here we are performing simple validation to make sure the user entered something into the text field.

Easy To Use Stock Form Validation Script
This versatile form validation script will work with any form that is configured to use it.

Validating Radio Buttons
By setting the value of the variable, "found_it" equal to the checked button's value, the original button loop script can easily find which button was checked. But what happens if no buttons are checked?

Clearing Radio Buttons
Sometimes you will need to clear only part of a form…

Select Menus and Date Object Validation
Select a month from the 1st menu and the correct number of days in that month will be displayed in the 2nd menu.

Email Address Validation Script
This sample email address validation script checks the email address for the format…

Getting user input
In this session we'll look at the JavaScript prompt. The prompt() is a method of the window object, just like alert() or confirm().

Forms
Forms are widely used on the Internet. The form input is often being sent back to the server or via mail to a certain e-mail account…

Forms
In this tutorial you learn From validation example using javascript…

Reading user input
This tutorial illustrates how you can read the data entered into the form by a user. It is not necessary to submit the data to the server if you can make something with JavaScript on the client side.

The Target property
Is it possible to submit a form in new window configured specially ? Imagine a form that submits in a window containing no navigation panel.

Form Elements
All of the properties you set for form fields with HTML are programatically accessible with JavaScript, however there are just a few key elements…

Form Events
Forms are driven largely by event attributes, so we should take a look at what the major event attributes are. First, the two primary event attributes for the form are onsubmit and onreset…

Form Objects
You can use these objects with their constructor functions to create new instances of the form element objects…

Form Object
Forms on the page are represented in JavaScript via the form object, and can be accessed in one of the 3 standard ways below…

Button Object
Form buttons () within your form can be accessed and manipulated using JavaScript via the corresponding Button object. To access a button in JavaScript, use the syntax…

Checkbox Object
Checkboxes ( ) within your form can be accessed and manipulated using JavaScript via the corresponding Checkbox object. There are two ways to access a checkbox, depending on whether it it unique in the…

Elements Object
The elements object (array) allows you to access any element within a form generically, via a loop for example. Each element inside the form is stored as an array element inside elements[]. The syntax is as follows…

FileUpload Object
The fileupload field () within your form can be accessed and manipulated using JavaScript via the corresponding FileUpload object. To access the field in JavaScript, use the syntax…

Option
The Option object allows you to dynamically create options for your selection list using JavaScript, or manipulate existing options through its properties. To dynamically create a new option, use the syntax…

Password Object
The password field within your form can be accessed and manipulated using JavaScript via the corresponding Password object. To access a button in JavaScript, use the syntax…

Radio Object
Radio buttons within your form can be accessed and manipulated using JavaScript via the corresponding Radio object. There are two ways to access a radio button, depending on whether it it unique in the form (distinct name), or part

Select Object
Form Select elements within your form can be accessed and manipulated using JavaScript, via the corresponding Submit object. To access the button in JavaScript, use the syntax…

Text Object
Text fields within your form can be accessed and manipulated using JavaScript, via the corresponding Text object. To access a text field in JavaScript, use the syntax…

TextArea Object
Textareas within your form can be accessed, validated, and manipulated using JavaScript, via the corresponding Textarea object. To access a textarea, use the syntax…

Form Events
In this tutorial we are going to look at a couple of event handlers that only get used with forms.

KeyPress validation
Learn the code of KeyPress validation…

Form Validation
Validation routines test for required strings whether a specific value, a range of accepted values or a pattern of an accepted format. Validation is required in forms…

Smart Forms
Smart or intelligent forms automate many repetitive tasks that we meet within our work or hobbies…

OBJECT: Form
Forms allow us to prompt a user for input using elements such as radio buttons, checkboxes and selection lists…

JavaScript in forms
On this page I give the code you need for checking user input in a form. Using these bits of code, you can write your own scripts to validate forms…

Example form
On this page, I have an example form and script that checks whether the user has filled in text fields and prints out the values the user filled in. Below I explain the part of the script that checks the text fields.

Select box navigation
A much needed script is the select box navigation. The user sees a select box as below, selects a destination and the new page is automatically loaded.

Dynamic options
On this page I explain the basics of generating options in a select box and give a script for dynamic options: when the user selects something from one option box another is automatically filled with new data.

Disabling form fields
A very useful tool is disabling of form elements. By using this you can make your forms easier to understand. "If you haven't checked this box, you cannot fill in that field"…

Forms
Forms are basically used to allow the user to enter some information, which will then used for further processing on the server…

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