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Populate hidden fields with JavaScript problem

Posted on 2010-08-19
2
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Last Modified: 2012-06-27
Hi Guys,

First off I know nothing (about JavaScript)

What I would like to do is have a certain amount of clickable links, that once clicked a hidden form field within a HTML table cell is updated to the value of  ' 1 '.

So lets say there is 1 table row with 4 columns, each of these columns has a link in (1,2,3,4) and a hidden field.  Once a link is clicked the value of the hidden field in the same column as the link gets updated to ' 1 '

Then if another link is clicked the same happens.  

So when the ' Submit ' button is pressed there is a value of  ' 1 ' set to all of the hidden fields that the corresponding link was clicked.

I've attached some code, which may make more sense.  I've tried to use some JavaScript but it only seems to add 1 value to only 1 hidden field.

Many thanks

Resna

<?php
foreach($_POST as $key => $value){
echo $value;
}
?>

<html>
<head>

<script type="text/javascript">

function add(){

i = document.getElementById('link').value;

eval("document.form1." + i + ".value='1'")

}
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="Untitled-3.php">
  <table width="600" border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td><input type="hidden" name="s1" />
        <a href="#" id="link" value="s1" onclick="add()">3</a></td>
        
      <td><input type="hidden" name="s2" />
        <a href="#" id="link" value="s2" onclick="add()">4</a></td>
        
      <td><input type="hidden" name="s3" />
        <a href="#" id="link" value="s3" onclick="add()">5</a></td>
        
      <td><input type="hidden" name="s4" />
        <a href="#" id="link" value="s4" onclick="add()">6</a></td>
        
    </tr>
  </table>
  <input type="submit" name="button" id="button" value="Submit" />
</form>
</body>
</html>

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Question by:Resna
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2 Comments
 
LVL 7

Accepted Solution

by:
Jonah11 earned 500 total points
ID: 33481361
Your code is not working because all the links have the same ID.  

The easiest way to fix it, however, is to put the link number as an argument to your javascript function.  Please see attached code.  I also created a test function so you can see that it's working.

Hope that helps.
<html>
<head>

<script type="text/javascript">

function add(linkNum){
  document.form1["s" + linkNum].value=1;
}

function testUpdates() {
	for(i=1; i<=4; i++) {
		alert(document.form1["s" + i].value);
	}
}

</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="Untitled-3.php">
  <table width="600" border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td><input type="hidden" name="s1" value="0"/>
        <a href="#" id="link1" value="s1" onclick="add(1)">3</a></td>
        
      <td><input type="hidden" name="s2"  value="0"/>
        <a href="#" id="link2" value="s2" onclick="add(2)">4</a></td>
        
      <td><input type="hidden" name="s3"  value="0"/>
        <a href="#" id="link3" value="s3" onclick="add(3)">5</a></td>
        
      <td><input type="hidden" name="s4"  value="0"/>
        <a href="#" id="link4" value="s4" onclick="add(4)">6</a></td>
        
    </tr>
  </table>
  <input type="submit" name="button" id="button" value="Submit" onclick="testUpdates()"/>
</form>
</body>
</html>

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Author Comment

by:Resna
ID: 33481795
Thanks Jonah11

Works perfectly, and I understand where I went wrong!

Many thanks

Resna
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