Im trying to write a script that will append the jquery cdn script to the body of the document.
function addJquery() {
url = "http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js";
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = url;
document.body.appendChild(script);
}
addJquery();
What am i doing wrong here
You can't add scripts to the body and have them execute. Late-loaded scripts must be loaded through the head element:
(function addJQuery() {
var url = "http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js";
var script = document.createElement('script');
script.url = url;
script.onload = function() { addJQuery(); }
document.head.appendChild(script);
}());
However, this loads jQuery regardless of whether it's already loaded, so that's no good. Here's what you generally want instead:
(function loadMyCode() {
// do we have jquery? if not, load it.
if (typeof jQuery === "undefined") {
var url = "http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js";
var script = document.createElement('script');
script.url = url;
script.onload = function() {
// this will run after jquery gets loaded
loadMyCode();
}
document.head.appendChild(script);
return;
}
// if we get here, we know we have jquery
//
// rest of the code goes here.
}());
This is another way
(function () {
var li = document.createElement('script');
li.type = 'text/javascript';
li.src= "http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js";
li.async=true;
var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(li, s);
})();
jandswon't help you