While executing the following code IE throws the error -- Object doesn't support this property or method -- referring to the cloneNode() method. 'i' is the loop counter, source and dest are both HTML select elements.
dest.options[dest.options.length] = source.options[i].cloneNode( true );
FF and Chrome behave as expected. Any ideas on how to get IE to execute cloneNode()? The IE 8 debugger shows source.options[i] does have a cloneNode() method.
Thanks.
IE requires the
new Option()
construct.
document.createElement( 'option' );
or
cloneNode()
will fail. Of course, all options work as expected in a proper web browser.
<!doctype html>
<html lang="en">
<head>
<meta charset= "utf-8">
<title>Untitled Document</title>
<style>
p, select,option{font-size:20px;max-width:640px}
</style>
<script>
function testSelect(n, where){
var pa= document.getElementsByName('testselect')[0];
if(!pa){
pa= document.createElement('select');
where.appendChild(pa);
pa.name= 'testselect';
pa.size= '1';
}
while(pa.options.length<n){
var i= pa.options.length;
var oi= document.createElement('option');
pa.appendChild(oi);
oi.value= 100*(i+1)+'';
oi.text= oi.value;
}
pa.selectedIndex= 0;
pa.onchange= function(e){
e= window.event? event.srcElement: e.target;
var val= e.options[e.selectedIndex];
alert(val.text);
}
return pa;
}
window.onload= function(){
var pa= testSelect(10, document.getElementsByTagName('h2')[0]);
var ox= pa.options[0];
pa.appendChild(ox.cloneNode(true))
}
</script>
</head>
<body>
<h2>Dynamic Select:</h2>
<p>You need to insert the select into the document,
and the option into the select,
before IE grants the options any attributes.
This bit creates a select element and 10 options,
and then clones and appends the first option to the end.
<br>It works in most browsers.
</p>
</body>
</html>
Actually, cloneNode isn't throwing any error. Break your code down into smaller chunks to properly identify the source of the error:
var origOpt = source.options[i];
var clonedOpt = origOpt.cloneNode( true ); // no error here
var destOptLength = dest.options.length;
dest.options[destOptLength] = clonedOpt; // error!
dest.options.add(clonedOpt); // this errors too!
dest.appendChild(clonedOpt); // but this works!
Or, putting it back the way you had it, all on one line:
dest.appendChild(source.options[i].cloneNode( true ));