Do something AFTER the page has loaded completely

$(window).load(function () {
    ....
});

If you have to wait for an iframe (and don't care about the assets, just the DOM) - try this:

$(document).ready(function() { 
    $('iframe').load(function() { 
       // do something
    });
});

That is the purpose of jQuery's .ready() event:

$(document).ready(function() {
    if ( $('#abc').length ) //If checking if the element exists, use .length
        alert("yes");
});

Description: Specify a function to execute when the DOM is fully loaded.

Related