Checking if empty - any solutions?

Add a script like this in your page head:

<script language="javascript">
function Validate()
{
if ( window.frames[0].objContent.DOM.body.innerText.length == 0 )
{
alert( 'The field X is required, please verify' ) ;
return false ;
}
return true ;
}
</script>

And set the onsubmit of your form to something like this:

<form onsubmit="return Validate();">

I hope it helps you. Best regards,
FredCK

How can I check a textbox when the form contains multiple instances of FCKeditor?

Add a script like this in your page head:

<script language="javascript">
function Validate(instancename)
{
if ( formname.instancename.value == '')
{
alert( 'The field X is required, please verify the instance: ' + instancename ) ;
return false ;
}
return true ;
}
</script>

And set the onsubmit of your form to something like this:

<form onsubmit="return Validate('instacename');">

I hope it helps you.

This does not work for me, the java script only returns the "old" value of the field (the value it had when the page was generated)

The earlier code accessing the IFRAME's DOM tree does work but has the problem that it doesn't detect if you've switched to the Source view.

I figured out that what you need to do is call setFieldValue() in de IFRAME that contains the editor.

In fact I added a getValue() function to the JavaScript version of the FCKEditor object, like this:

FCKeditor.prototype.getValue = function()
{
document.frames['frame_' + this.InstanceName].setFieldValue();
return parent.document.getElementsByName(this.InstanceName);
}

and added this line:

name="frame_' + this.InstanceName + '"

to the IFRAME generating code in the Create() function.

In the JavaScript code of your page you now only have to do oFCKEditor.getValue() to retrieve the current value of the field. NB: If the field was in Source mode it will be set to HTML mode again because that's a side-effect of the setFieldValue() function.

Sorry, the return statement in the above getValue() function should be:

return parent.document.getElementsByName(this.InstanceName)[0].value;