Storing the last value using a Hidden object.

 

<html>
<head>
<title>Hidden Test</title>
<script language="JavaScript">
     function postData(value) {
          document.form1.holder2.value = document.form1.holder.value
          document.form1.holder.value = value
     }
   
     function resetValue() {
          var len = document.form1.itemList.length
          for (var i=0; i<len; i++) {
               if (document.form1.itemList[i].value == document.form1.holder2.value) {
                    document.form1.itemList[i].checked = "1"
                    break 
               }
          }
     }
   
</script>
</head>
   
<body>
<form name="form1" method="POST">
<p>
<input type=radio name="itemList" value="A" onClick="postData(this.value)">A
</p>
<p>
<input type=radio name="itemList" value="B" onClick="postData(this.value)">B
</p>
<p>
<input type=radio name="itemList" value="C" onClick="postData(this.value)">C
</p>
<p>
<input type=radio name="itemList" value="D" onClick="postData(this.value)">D</p>
<p><input type=radio name="itemList" value="E" onClick="postData(this.value)">E</p>
<p><input type=button name="UndoLast" value="Undo Last" onClick="resetValue()"></p>
  
<INPUT TYPE="hidden" NAME="holder" value="">
<INPUT TYPE="hidden" NAME="holder2" value="">
</form>
</body>
</html>

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3.	Checking Elements on a Form
4.	Submitting Forms to the Server
5.	Variables in Hidden form
6.	Creating an Example Form for User Feedback
7.	Accessing the Elements of a Form
8.	Using the form.elements Array
9.	form.reset() and form.submit() Methods
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11.	Passing a Form Object and Form Element to Functions
12.	Last-Minute Checking Before Form Submission
13.	A Form for Entering a URL
14.	Methods and Properties of the Submit Object
15.	Methods and Properties of the Reset Object
16.	Properties of the Hidden Object
17.	Methods and Properties of the Form Object
18.	Client-Side JavaScript Objects and HTML Tags That Create Instances of Them
19.	Using the document.forms Property
20.	Use hidden field to store data

Storing the last value using a Hidden object. : Form HTML « Form Control « JavaScript DHTML

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