javascript reports "UNDEFINED" for every function I assign to the onchange event. what is wrong with the code?

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1.50/5 (2 votes)

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<head>
<script type="text/javascript">
function wtf()
{
window.alert("wtf???");
}</script>
</head>
<body onload="wtf()><!--{exception}	'wtf' is undefined-->
   Kinds:<select id="Select1" name="D1" onchange="wtf();">
  <option value='1'>1,Platform</option>
   <option value='1'>1,yadda</option>
  </select>Domains

Posted 15-Aug-14 12:25pm

Geno Carman

Updated 15-Aug-14 15:53pm

v6

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[no name] 15-Aug-14 21:58pm

3 solutions

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Peter Leow · Answer 1 · 2014-08-15T18:07:00

Try this:

XML

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function wtf()
{
   var select = document.getElementById("Select1");
   // get the selected value
   alert(select.value);

   var selectedText = select.options[select.selectedIndex].text;
   // get the selected text
   alert(selectedText);
}</script>
</head>
<body>
   Kinds: <select id="Select1" name="D1" onchange="wtf();">
     <option value='1'>Platform</option>
     <option value='2'>yadda</option>
  </select> Domains
</body>
</html>

Sergey Alexandrovich Kryukov · Answer 2 · 2014-08-15T13:26:00

Solution 1

There is nothing to change with just one option in the select element; should be at least two.

But it works for me; there is nothing undefined. You can write alert instead of window.alert. This method present in the window object, so you can use it.

—SA

Posted 15-Aug-14 13:26pm

Sergey Alexandrovich Kryukov

Geno Carman · Answer 3 · 2014-08-17T06:05:00

Solution 3

So I am the only one that keeps getting the error saying that the function 'wtf'(and every other function I write) is undefined?

Posted 17-Aug-14 6:05am