Check if Div Layer/Object Exists

lian_a · December 19th, 2004, 03:20 AM

Hi! Can someone please tell me how do I check if a div layer or an object exists in a page? Please help...

Thanks!

joefawcett · December 19th, 2004, 06:05 AM

If it has a known id then it's simple in modern browsers:

Code:

function testForObject(Id, Tag)
{
  var o = document.getElementById(Id);
  if (o)
  {
    if (Tag)
    {
      if (o.tagName.toLowerCase() == Tag.toLowerCase())
      {
        return o;
      }
    }
    else
    {
      return o;
    }
  }
  return null;
}

Then you can test for any element with an id of "divMain" with:

Code:

var o = testForObject("divMain");
if (o)
{
  //do something will object
}
else
{
  alert("No object found.");
}

or you can limit it to objects of a specific type:

Code:

var o = testForObject("divMain", "div");
if (o)
{
  //do something will object
}
else
{
  alert("No object found with specific tag anme.");
}

--

Joe (Microsoft MVP - XML)

lian_a · December 20th, 2004, 11:41 PM

i tried using the code you've given me..i came up with this...

<html>
<head>
<title>Untitled Document</title>



<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body bgcolor="#FFFFFF" >

<DIV ID="oDiv1">Div #1</DIV>
<DIV ID="oDiv2">Div #2</DIV>
<DIV ID="oDiv3">Div #3</DIV>
<INPUT TYPE="button" VALUE="Get Names" onclick="testForObject('oDiv1');">

</body>
</html>

i keep getting the error 'object expected'. i don't know why. help!

lian_a · December 21st, 2004, 01:40 AM

i found the error in my code..



the tags should be between the <script> tags...hehehe! thanks for your help joe! =)

co2tux2600 · October 18th, 2006, 04:20 PM

Works great! Cheers!!

phpPro2000 · April 23rd, 2008, 01:53 AM

Thanks a lot. It works like a charm