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I'm currently reading this article on Deferring the loading of Javascript: https://developers.google.com/speed/docs/best-practices/payload#DeferLoadingJS
They use this script:
<script type="text/javascript">
// Add a script element as a child of the body
function downloadJSAtOnload() {
var element = document.createElement("script");
element.src = "deferredfunctions.js";
document.body.appendChild(element);
}
// Check for browser support of event handling capability
if (window.addEventListener)
window.addEventListener("load", downloadJSAtOnload, false);
else if (window.attachEvent)
window.attachEvent("onload", downloadJSAtOnload);
else window.onload = downloadJSAtOnload;
</script>
I currently have 4 separate Javascript files that I'd like to "defer".
How would I achieve this using Google's example code?
Many thanks for any pointers.
992
Following script is working.... just copy paste below html and javascript in an html file and enjoy
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head>
<title>HTML Lazy Loading</title>
<link href="/skins/Skin_1/style.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
function myGetTime() {
var dd = new Date();
var hh = dd.getHours();
var mm = dd.getMinutes();
var ss = dd.getSeconds();
var ms = dd.getMilliseconds();
return ("<br/>The time is now: " + hh + ":" + mm + ":" + ss + ":" + ms + "<br/>");
}
</script>
</head>
<body>
<div style="color:blue;margin-left:10px;margin-top:10px;" >
<script type="text/javascript">
document.write("Time before loading all scripts");
document.write(myGetTime() +"<br/>");
</script>
<div style="color:blue;margin-left:10px;margin-top:10px;" >
<script type="text/javascript">
function downloadJSAtOnload() {
var element2 = document.createElement("script");
element2.src = "https://jqueryjs.googlecode.com/files/jquery-1.2.6.js";
document.body.appendChild(element2);
var element4 = document.createElement("script");
element4.src = "https://www.apparelnbags.com/jscripts/validation_forms.js";
document.body.appendChild(element4);
var element5 = document.createElement("script");
element5.src = "https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js";
document.body.appendChild(element5);
var element6 = document.createElement("script");
element6.src = "https://www.apparelnbags.com/jscripts/slideshow_header.js";
document.body.appendChild(element6);
var element6 = document.createElement("script");
element6.src = "https://www.apparelnbags.com/jscripts/slideshow_header.js";
document.body.appendChild(element6);
var element7 = document.createElement("script");
element7.src = "https://www.apparelnbags.com/jscripts/jquery.js";
document.body.appendChild(element7);
var element8 = document.createElement("script");
element8.src = "https://www.apparelnbags.com/jscripts/jquery.lazyload.js";
document.body.appendChild(element8);
var element9 = document.createElement("script");
element8.src = "http://www.apparelnbags.com/AnBTreeViewMenu/jsTreeMenu/jMenu.js";
document.body.appendChild(element9);
}
if (window.addEventListener)
window.addEventListener("load", downloadJSAtOnload, false);
else if (window.attachEvent)
window.attachEvent("onload", downloadJSAtOnload);
else window.onload = downloadJSAtOnload;
</script>
</div>
<div id="dvHeaderMiddle" style="position:absolute; top:400px; left:350px;">
</div>
<script type="text/javascript">
document.write("Time After loading all scripts");
document.write(myGetTime() +"<br/>");
</script>
</body>
</html>
Welcome Dear michael mc gurk Below is another answer of StackOverFlow. And it is also pretty handy
enter link description here
(function() {
function getScript(url,success){
var script=document.createElement('script');
script.src=url;
var head=document.getElementsByTagName('head')[0],
done=false;
script.onload=script.onreadystatechange = function(){
if ( !done && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete') ) {
done=true;
success();
script.onload = script.onreadystatechange = null;
head.removeChild(script);
}
};
head.appendChild(script);
}
getScript('http://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js',function(){
// YOUR CODE GOES HERE AND IS EXECUTED AFTER JQUERY LOADS
});
})();
I would really combine jQuery and jQuery-UI into one file and use a url to it. If you REALLY wanted to load them separately, just chain the getScripts:
getScript('http://myurltojquery.js',function(){
getScript('http://myurltojqueryUI.js',function(){
//your tab code here
})
});
Happy Coding :)
151
In the downloadJSAtOnload() function, you just load all three scripts. Here's the simplest copy/paste method:
// Add a script element as a child of the body
function downloadJSAtOnload() {
var element = document.createElement("script");
element.src = "deferredfunctions.js";
document.body.appendChild(element);
element = document.createElement("script");
element.src = "deferredfunctions2.js";
document.body.appendChild(element);
element = document.createElement("script");
element.src = "deferredfunctions3.js";
document.body.appendChild(element);
}
// Check for browser support of event handling capability
if (window.addEventListener)
window.addEventListener("load", downloadJSAtOnload, false);
else if (window.attachEvent)
window.attachEvent("onload", downloadJSAtOnload);
else window.onload = downloadJSAtOnload;
And, here's a little cleaner way:
function loadScript(src) {
var element = document.createElement("script");
element.src = src;
document.body.appendChild(element);
}
// Add a script element as a child of the body
function downloadJSAtOnload() {
loadScript("script1.js");
loadScript("script2.js");
loadScript("script3.js");
}
// Check for browser support of event handling capability
if (window.addEventListener)
window.addEventListener("load", downloadJSAtOnload, false);
else if (window.attachEvent)
window.attachEvent("onload", downloadJSAtOnload);
else window.onload = downloadJSAtOnload;
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