Hi All

Why don't we use summary tag to make collapsable element?. It's HTML5 built-in feature, and supported by all browsers. And the good thing about it that this tag doesn't need Javascript to work.

Hello again. Sorry for reopen the task.

@Bawolff This is exactly what I do right now. But my idea is to make the process less reliable than one tool. That's why I think gadget is very good solution to this.

@Bawolff I will explain how hijri date is calculated.

This website doesn't have a contact email, or a form to reach them. Which is very strange!. But As I see from the footer, they said "All rights reserved ©"Personally I contact other websites that offer the same service (hijri date) Like this, but they refuse each time, or didn't reply at all.

@Aklapper You misunderstand the solution. My idea was to write a gadget, and any user can enable it. And if he enable it from the preferences, then he must agree that it may share some data with that website. And anyway, if that happened, it will be enabled for only very few users in arwiki (interface sysop).

Exactly, this is the problem.

Thanks for reply. I use the same regex in arwiki, but of course I change the characters from category to تصنيف which is the opposite of category keyword in arwiki.

I think the problem is solved. The edit done by @Catrope fix the the error. But I can't really know why it was produce an error?.
document.getElementById ('wpTextBox1').value;
is equal to:
$('#wpTextbox1').val();
The first written in javascript, and the second written in jquery.