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How do you save information from a Javascript generated form, which depends on a regular form and the onChange() function?

Posted on 2009-05-15
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Last Modified: 2012-05-07
I'm hoping that someone can help me with a HTML/Javascript problem I'm having.

The code below displays a drop down menu with the options ('1', '2', '3').

Selecting any one of the options results in the use of the onChange function of the HTML form to access a Javascript that generates an additional text box form. The number of text boxes that are generated depend on the number selection in the drop down menu. '1' text box is generated by default.

THE PROBLEM: Let's say I write something in the 'First Name:' field. Then let's say I alter my selection in the drop down menu form. This results in the information I entered disappearing. I want to maintain this information and reload it into the regenerated form but can't find a way to do it. I would really appreciate any help.

ADDITIONAL INFO: I understand that it would be very simple in this case for the user to just re-enter the data, but the current code is a simple example of a more complicated form that I'm working on.

Thanks.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
 
<script type="text/javascript">
 
function tryIt(param) {
	var content = "";	
	
	if(param>0) {
		if(document.getElementById){
			for(i=0; i<param; i++) {
			//Generates part of the form that looks like -> First Name:<input type="text" name="fname1" id="a1">
				content = content + "<br />First Name:<input type=\"text\" name=\"fname"+i+"\" id=\"a"+i+"\" >";
			}
		}
		document.getElementById('outputs').innerHTML = content;
	}	
}
 
</script>
 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
 
<body>
 
<form action="randomLink.asp" method="get">
	<select name="modifyData" onChange="tryIt(this.options[this.selectedIndex].value)">
    	<option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
    </select>
    <br />
    <div id="outputs">
	</div>
</form>
 
 
<!-- The script is called once during the page load so that the form is generated with 1 as the default input -->
 
<script type="text/javascript">
tryIt(1);
</script>
 
 
</body>
</html>

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Question by:smik011
1 Comment
 
LVL 14

Accepted Solution

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sam2912 earned 250 total points
ID: 24395943
change your function:
<script type="text/javascript">
 
function tryIt(param) {
	var values = new Array();
		// save values
                if(document.getElementById){
                        for(i=0; i<param; i++) { try {
                        	e=eval(document.getElementById("a"+i));
				values[i]=e.value;
                        } catch(e) {}}
                }
 
        var content = "";       
        
        if(param>0) {
                if(document.getElementById){
                        for(i=0; i<param; i++) {
				// Get saved value if available
				var val="";
				(values[i]&&values[i]!="undefined")?val=values[i]:val="";
				
                        	//Generates part of the form that looks like -> First Name:<input type="text" name="fname1" id="a1">
                                content = content + "<br />First Name:<input type=\"text\" name=\"fname"+i+"\" id=\"a"+i+"\" value=\""+val+"\" >";
                        }
                }
                document.getElementById('outputs').innerHTML = content;
        }       
}
 
</script>

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