Hidden Fields

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Email Hidden form fields are text fields that are not displayed in the browser and the user cannot modify their values. Forms with hidden fields can be generated dynamically by CGI programs as a result of processing data submitted by previous forms. The following example illustrates the use of hidden form fields along with JavaScript. The example has three different forms. The first form requests for the users name. The second form requests for the user age and the third one requests for the qualification. With Javascript the need to send three different forms to the server can be eliminated. A script can process all the three forms and consolidate the forms result before sending them to the server.

The first HTML code defines a frameset with two frames.

<html>
<head>
<title>Hidden Fields</title>
</head>
<frameset cols="20"border=0>
<frame src="form1.html">
<frame src="hidden.html">

<frame src="hidden.html">
</frameset>
</html>

Save this file as frame.html. The second HTML code defines a form with three hidden fields.

<html>
<head>
<title>Hidden Fields</title>
</head>

<body>
<form action="" name="controlForm" method="post" taret="_top" onSubmit="return open()">

<input type="hidden" name="username" value="">
<input type="hidden" name="userage" value="">

<input type="hidden" name="userqual" value="">

</form>
</body>
</html>



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JAVASCRIPT

 Types of Variables
Arrays
Data Type Conversion
Arithmetic Operators
Logical and Comparison Operators
Assignment Operators
Ternary Operators
Operator Precedence
Assignment Statements
If Statements
Switch Statement
Function Call Statement
Try, Catch and Throw Statements
The For Loop
Java While Loop
The Do While Loop
Break and Continue Statements
String Methods
Array Methods
Objects, Methods and Properties
The Boolean Object
The Date Object
The Global Object
The Math Object
The Number Object
Color Constants
Hierarchy of Browser Objects
Window Object
Document Object
History Object
Navigator Object
Buttons
Check Box
Radio Buttons
Text Fields
Working with Image Maps
Creating Simple Animation
Hidden Fields
Working with Style Sheets
An Example of HTML Graphics Replacement
The <SPAN> Tag
Positioning of HTML Content
The <LAYER> Tag

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