Question

i need code like this

if($('#someElement').hasClass('test'))
{
...
}

but i need to check it persistently not in a specific position.
my question is function like bind can help me or i have to use interval for checking?

Answer 1

If you want to check like all the time. You will need to use an interval. A bind can only be used to bind events. Like click, mouseenter, etc.

If you want to know when an element gains a class. You should use something like:

setInterval($.proxy(function(){
    if( this.hasClass("test") && !this.data("classAdded") )
    {
        this.data("classAdded", true);
        // Class added only triggers once.
    }
}, $("#el")), 50);