Question

javascript document.elementByiD() NOT RETURNING VALUE

Asked by: greta13

Internet Explorer 8  FireFox 3.5.3
I am trying to pass a value to a from an option form to documentelementbyid and then check it.
My error is below.  I want to  check that value and make a decision based on an ==.
see code below...i have sued this with a jpg file name and can return the file name....and can match it as an alternative...but what is going on here..why will documentellementIdBy  not handle this...by as you can see in code below i am handling case sensitivity properly
thanks

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E)
Timestamp: Sat, 31 Oct 2009 17:28:08 UTC


Message: Object doesn't support this property or method
Line: 41
Char: 2
Code: 0
URI: file:///F:/fishman/assign7/a_folder/a.htm


Message: Object doesn't support this property or method
Line: 41
Char: 2
Code: 0
URI: file:///F:/fishman/assign7/a_folder/a.htm


Message: 'document.getElementById(...)' is null or not an object
Line: 36
Char: 1
Code: 0
URI: file:///F:/fishman/assign7/a_folder/a.htm

function chpix()
{
 
	var x = document.getElementByID('f1').value;
	if (x=='AAA')
	alert(text);
			
				}
 
<body>
 
<form>
		<select id="f1" onChange="chpix()">
			<option value="AAA">first value  </option>
			<option value="b1">first</option>
			<option value="c1">third value</option>
			<option value="d1">forth value</option>
		
		</select>
	</form>
 
</body>
 
 
 
 
</body>

                                  
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Asked On
2009-10-31 at 10:39:06ID24860935
Topic

Dynamic HTML (DHTML)

Participating Experts
2
Points
500
Comments
9

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Answers

 

by: HonorGodPosted on 2009-10-31 at 10:56:03ID: 25710722

Which is line 41?

 

by: leakim971Posted on 2009-10-31 at 10:57:21ID: 25710736

Hello great13,

Use :

<form name="formname">

document.forms['formname'].getElementById('f1').value

                                              
1:

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by: HonorGodPosted on 2009-10-31 at 10:58:04ID: 25710743

Why do you have 2 body tags?

 

by: HonorGodPosted on 2009-10-31 at 10:59:57ID: 25710754

You are missing a script tag.

<script type='text/javascript'>
  function chpix() {
    var x = document.getElementByID('f1').value;
    if ( x == 'AAA' ) {
      alert( 'x is "AAA"' );
    }
  }
</script>

                                              
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by: HonorGodPosted on 2009-10-31 at 11:07:00ID: 25710800

oh, and the method has "Id" not ID

<html>
<head>
<script type='text/javascript'>
  function chpix() {
    var x = document.getElementById('f1').value;
    alert( 'Selected value: "' + x + '"' );
  }
</script>
</head>
<body>
  <select id="f1" onChange="chpix()">
    <option value="AAA">first value  </option>
    <option value="b1">first</option>
    <option value="c1">third value</option>
    <option value="d1">forth value</option>
  </select>
</body>
</html>

                                              
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by: greta13Posted on 2009-10-31 at 12:18:04ID: 25711120

thanks leakim971...
Still getting error please see code below and error message
I tried to clean up things a bit ...code that is..thanks


function chpix()
{
 
      var x = document.forms['f1'].getElementById('s1').value
      if (x=='AAA');
      alert(text);
}

<form name="f1">
            <select id="s1" onChange="chpix()">
                  <option value="AAA">option1  </option>
                  <option value="b1">option1</option>
                  <option value="c1">option1</option>
                  <option value="d1">option1</option>
            
            </select>
      </form>


ERRROR:  object does not support property or method

 

by: leakim971Posted on 2009-10-31 at 12:31:23ID: 25711176

My mistake with the "forms" part
HonorGod code is the right code to use.

Tested the following work on Firefox :

 

by: leakim971Posted on 2009-10-31 at 12:31:52ID: 25711180

Sorry :

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Document sans nom</title>
<script language="javascript">
function chpix()
{
 
      var x = document.getElementById('s1').value
      if (x=='AAA');
      alert(x);
}
 
 
</script>
</head>
 
<body>
<form name="f1">
            <select id="s1" onChange="chpix()">
                  <option value="AAA">option1  </option>
                  <option value="b1">option1</option>
                  <option value="c1">option1</option>
                  <option value="d1">option1</option>
            
            </select>
      </form>
</body>
</html>
                                              
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by: greta13Posted on 2009-10-31 at 12:43:31ID: 31648412

thanks worls great..

20120131-EE-VQP-002

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