Test if Table ID exists

Moebius01 · Jan 27, 2005

Is there a way to check if a table exists before running code?

I have a handful of pages in a site that all have the same table on them (same table id). I'd like to have my include file run a function on the table if it exists on the page being loaded. If not, the function should stop. Is there a way to achieve this?

kaht · Jan 27, 2005

Sure, just use an if statment like so:

Code:

<html>
<script language="JavaScript">

function checkForTables() {

   //check for the first table
   if (document.getElementById("table1")) {
      alert("table1 exists");
   }
   else {
      alert("table1 does not exist");
   }

   //check for the second table
   if (document.getElementById("table2")) {
      alert("table2 exists");
   }
   else {
      alert("table2 does not exist");
   }

}

</script>
<body onload='checkForTables()'>
<form name=blahForm>

<table id=table1>
<tr><td>This is table 1</td></tr>
</table>

</form>
</body>
</html>

-kaht

Weaseling out of things is important to learn. It's what separates us from the animals... except the weasel. - Homer Simpson (no, I'm not Homer)

Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Test if Table ID exists

Moebius01

Programmer

kaht

Programmer

Similar threads

Part and Inventory Search

Sponsor