execute function after complete page load [duplicate]

I am using following code to execute some statements after page load.

 <script type="text/javascript">
    window.onload = function () { 

        newInvite();
        document.ag.src="b.jpg";
    }
</script>

But this code does not work properly. The function is called even if some images or elements are loading. What I want is to call the function the the page is loaded completely.

Solution 1:

this may work for you :

document.addEventListener('DOMContentLoaded', function() {
   // your code here
}, false);

or if your comfort with jquery,

$(document).ready(function(){
// your code
});

$(document).ready() fires on DOMContentLoaded, but this event is not being fired consistently among browsers. This is why jQuery will most probably implement some heavy workarounds to support all the browsers. And this will make it very difficult to "exactly" simulate the behavior using plain Javascript (but not impossible of course).

as Jeffrey Sweeney and J Torres suggested, i think its better to have a setTimeout function, before firing the function like below :

setTimeout(function(){
 //your code here
}, 3000);

Solution 2:

JavaScript

document.addEventListener('readystatechange', event => { 

    // When HTML/DOM elements are ready:
    if (event.target.readyState === "interactive") {   //does same as:  ..addEventListener("DOMContentLoaded"..
        alert("hi 1");
    }

    // When window loaded ( external resources are loaded too- `css`,`src`, etc...) 
    if (event.target.readyState === "complete") {
        alert("hi 2");
    }
});

same for jQuery:

$(document).ready(function() {   //same as: $(function() { 
     alert("hi 1");
});

$(window).load(function() {
     alert("hi 2");
});

NOTE: - Don't use the below markup ( because it overwrites other same-kind declarations ) :

document.onreadystatechange = ...