Why I can't use onchange atribute with select field?

[Jimmi08]

Question

Tested with the select field.
V1 code:
$cl.= form::form_select_open("category_form", "onchange=\"top.window.location = '".e_PLUGIN."SP_FormBuilder/admin/formbuilder.php?'+this.options[this.selectedIndex].value;\"");

Because this code:

foreach (array_keys($user_options) as $key)
	{
	if(!isset($def_options[$key]) && substr($key,0,5)!='data-') unset($user_options[$key]); // data-xxxx exempt //remove it?
	}

if(substr($option,0,5) =='data-')
{
	$ret .= " ".$option."='{$optval}'";	
}

I can't update that code with e_form with
$cl.= $frm->select_open("category_form", array('onchange'=>$onchange) );

How to do it now? Thanks

[CaMer0n]

https://stackoverflow.com/questions/11179406/jquery-get-value-of-select-onchange

[Jimmi08]

https://stackoverflow.com/questions/11179406/jquery-get-value-of-select-onchange

Sorry, I didn't get what you were trying to say.

I have working code with the latest e107 (jquery, PHP 7.2...) the only problem is that it uses old form class, not a new one e_form. And because I wanted to update it, I found that it is not possible now.

Why do you limit user attributes only for "data-"? - I suppose you probably need this for Admin UI,
There is already the option for this. There are default attributes and user attributes.
Why they are limited only for name "data-" ?

Thanks

[CaMer0n]

@Jimmi08 We have jQuery built in, so better to use it. That link provides the modern solution to solve your problem.

[Jimmi08]

So you need a separated javascript code. Just great, Thanks