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Load jquery dynamically before using jquery

My script will be using as widget in third-party website so i don't aware about jquery loaded and which version of jquery loaded or not at third-party end.
So Before loading below script i want to check is there already latest jquery 1.11.1 loaded after dom ready if not then i want to load the jquery latest and run below script.
script.js
var $ = jQuery.noConflict( true );
(function( $ ) {
$(document).ready(function() {
alert("Document Ready ");
});
})($jy);
EDIT 1
var addNewJQuery = function() {
(function( $ ) {
$jy = $;
var invokeOriginalScript;
$(document).ready(function() {
......my code here.....
}):
})(jQuery);
}

Not sure if this is working for you, but it looks like it is working.
Maybe you need to remove the other script from your header after you loaded the second jQuery file. But it seems to work with both scripts loaded.
I've also added a check if jQuery is loaded at all, if not it will load jQuery.
You can also find the same code in this fiddle.
var addNewJQuery = function() {
//var jQ = jQuery.noConflict(true);
(function ($) {
$(document).ready(function () {
alert("You are now running jQuery version: " + $.fn.jquery);
});
})(jQuery);
};
if ( typeof jQuery === 'undefined' ) {
alert('no jQuery loaded');
//throw new Error("Something went badly wrong!"); // now you could load jQuery
loadScript('https://code.jquery.com/jquery-1.11.2.js', addNewJQuery);
}
if ($.fn.jquery !== '1.11.2') {
console.log('detected other jQuery version: ', $.fn.jquery);
loadScript('https://code.jquery.com/jquery-1.11.2.js', addNewJQuery);
}
function loadScript(url, callback)
{
// Adding the script tag to the head as suggested before
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = url;
// Then bind the event to the callback function.
// There are several events for cross browser compatibility.
script.onreadystatechange = callback;
script.onload = callback;
// Fire the loading
head.appendChild(script);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

How to detect jquery is loaded when loading it dynamicly

I'm trying to load jquery to page if it's not loaded. I'll run some code right after loading it. With below code, i am trying to catch it when jquery is loaded.
My code loads jquery correctly but not raising onreadystatechange event.
if(typeof jQuery=='undefined') {
var headTag = document.getElementsByTagName("head")[0];
var jqTag = document.createElement('script');
jqTag.type = 'text/javascript';
jqTag.src = 'http://localhost:8001/jquery-min.js';
headTag.appendChild(jqTag);
jqTag.onreadystatechange= function () {
if (this.readyState == 'complete') {
this.loadWidget(containerId);
}
};
}
else {
this.loadWidget(containerId);
}
How can i catch it when jquery is loaded?

script tags have an onload event for when the script has loaded
if (typeof jQuery === 'undefined') {
var headTag = document.getElementsByTagName("head")[0];
var jqTag = document.createElement('script');
jqTag.type = 'text/javascript';
jqTag.onload = function() {
this.loadWidget(containerId);
}
jqTag.src = 'http://localhost:8001/jquery-min.js';
headTag.appendChild(jqTag);
} else {
this.loadWidget(containerId);
}

In my opinion your code is way too complicated.
Why not do what HTML5 boilerplate has done:
<script>window.jQuery || document.write('<script src="js/vendor/jquery-1.10.2.min.js"><\/script>')</script>
If the window.jQuery object isn't detected it elegantly fails over to write out the script tag to include it in native Javascript. You can, of course change the path to whatever you want.
Hope this helps.

Adding jQuery by demand and use $?

I have a TextBox and a Button:
If the value inside the Textbox is 1 (just emulating a condition)) I need to load jQuery on the fly and use a document Ready function :
I tried this :
function work() //when button click
{
if (document.getElementById('tb').value == '1')
{
if (typeof jQuery == 'undefined')
{
var script = document.createElement('script');
script.src = "http://code.jquery.com/jquery-git2.js";
document.getElementsByTagName('head')[0].appendChild(script);
$(document).ready(function ()
{
alert('');
});
}
}
}
But it says :
Uncaught ReferenceError: $ is not defined
I assume it's because the line : $(document).ready(function ()....
But I don't understand why there is a problem , since i'm, loading jQuery BEFORE I use $...
Question :
How can I fix my code to work as desired ?
JSBIN

You are missing the script onload handler:
var script = document.createElement('script');
// do something with script
// onload handler
script.onload = function () {
// script was loaded, you can use it!
};
Your function becomes:
function work() {
if (document.getElementById('tb').value != '1') { return; }
if (typeof jQuery != 'undefined') { return; }
// jQuery is undefined, we will load it
var script = document.createElement('script');
script.src = "http://code.jquery.com/jquery-git2.js";
document.getElementsByTagName('head')[0].appendChild(script);
// load handler
script.onload = function () {
// jQuery was just loaded!
$(document).ready(function () {
alert('');
});
};
}
Also, do not forget script.onreadystatechange for IE compatibility.
script.onreadystatechange = function () {
if (script.readyState === 'loaded' || script.readyState === 'complete') {
// script was loaded
}
}
Also seems that YepNope would be a good option, too.
JSBIN DEMO

Using YepNope would probably a good option in this case.
yepnope([
{
test: window.jQuery,
nope: 'path/url-to-jquery.js',
complete: function() {
$(document).ready(function() {
//whatever you need jquery for
});
}
}
]);
You can just put that in the head of your document, and it will only load jquery if window.jQuery isn't defined. It's much more reliable (and simpler) than script.onload or script.onreadystatechange. the callback complete will only be called once jquery is loaded, so you can be sure that $ will be defined at that point.
Note: if you're using Modernizr.js on your site, there's a good chance yepnope is already bundled into that script.

Verify External Script Is Loaded

I'm creating a jquery plugin and I want to verify an external script is loaded. This is for an internal web app and I can keep the script name/location consistent(mysscript.js). This is also an ajaxy plugin that can be called on many times on the page.
If I can verify the script is not loaded I'll load it using:
jQuery.getScript()
How can I verify the script is loaded because I don't want the same script loaded on the page more than once? Is this something that I shouldn't need to worry about due to caching of the script?
Update:
I may not have control over who uses this plugin in our organization and may not be able to enforce that the script is not already on the page with or without a specific ID, but the script name will always be in the same place with the same name. I'm hoping I can use the name of the script to verify it's actually loaded.

If the script creates any variables or functions in the global space you can check for their existance:
External JS (in global scope) --
var myCustomFlag = true;
And to check if this has run:
if (typeof window.myCustomFlag == 'undefined') {
//the flag was not found, so the code has not run
$.getScript('<external JS>');
}
Update
You can check for the existence of the <script> tag in question by selecting all of the <script> elements and checking their src attributes:
//get the number of `<script>` elements that have the correct `src` attribute
var len = $('script').filter(function () {
return ($(this).attr('src') == '<external JS>');
}).length;
//if there are no scripts that match, the load it
if (len === 0) {
$.getScript('<external JS>');
}
Or you can just bake this .filter() functionality right into the selector:
var len = $('script[src="<external JS>"]').length;

Few too many answers on this one, but I feel it's worth adding this solution. It combines a few different answers.
Key points for me were
add an #id tag, so it's easy to find, and not duplicate
Use .onload() to wait until the script has finished loading before using it
mounted() {
// First check if the script already exists on the dom
// by searching for an id
let id = 'googleMaps'
if(document.getElementById(id) === null) {
let script = document.createElement('script')
script.setAttribute('src', 'https://maps.googleapis.com/maps/api/js?key=' + apiKey)
script.setAttribute('id', id)
document.body.appendChild(script)
// now wait for it to load...
script.onload = () => {
// script has loaded, you can now use it safely
alert('thank me later')
// ... do something with the newly loaded script
}
}
}

#jasper's answer is totally correct but with modern browsers, a standard Javascript solution could be:
function isScriptLoaded(src)
{
return Boolean(document.querySelector('script[src="' + src + '"]'));
}
UPDATE July 2021:
The accepted solutions above have changed & improved much over time. The scope of my previous answer above was only to detect if the script was inserted in the document to load (and not whether the script has actually finished loading).
To detect if the script has already loaded, I use the following method (in general):
Create a common library function to dynamically load all scripts.
Before loading, it uses the isScriptLoaded(src) function above to check whether the script has already been added (say, by another module).
I use something like the following loadScript() function to load the script that uses callback functions to inform the calling modules if the script finished loading successfully.
I also use additional logic to retry when script loading fails (in case of temporary network issues).
Retry is done by removing the <script> tag from the body and adding it again.
If it still fails to load after configured number of retries, the <script> tag is removed from the body.
I have removed that logic from the following code for simplicity. It should be easy to add.
/**
* Mark/store the script as fully loaded in a global variable.
* #param src URL of the script
*/
function markScriptFullyLoaded(src) {
window.scriptLoadMap[src] = true;
}
/**
* Returns true if the script has been added to the page
* #param src URL of the script
*/
function isScriptAdded(src) {
return Boolean(document.querySelector('script[src="' + src + '"]'));
}
/**
* Returns true if the script has been fully loaded
* #param src URL of the script
*/
function isScriptFullyLoaded(src) {
return src in window.scriptLoadMap && window.scriptLoadMap[src];
}
/**
* Load a script.
* #param src URL of the script
* #param onLoadCallback Callback function when the script is fully loaded
* #param onLoadErrorCallback Callback function when the script fails to load
* #param retryCount How many times retry laoding the script? (Not implimented here. Logic goes into js.onerror function)
*/
function loadScript(src, onLoadCallback, onLoadErrorCallback, retryCount) {
if (!src) return;
// Check if the script is already loaded
if ( isScriptAdded(src) )
{
// If script already loaded successfully, trigger the callback function
if (isScriptFullyLoaded(src)) onLoadCallback();
console.warn("Script already loaded. Skipping: ", src);
return;
}
// Loading the script...
const js = document.createElement('script');
js.setAttribute("async", "");
js.src = src;
js.onload = () => {
markScriptFullyLoaded(src)
// Optional callback on script load
if (onLoadCallback) onLoadCallback();
};
js.onerror = () => {
// Remove the script node (to be able to try again later)
const js2 = document.querySelector('script[src="' + src +'"]');
js2.parentNode.removeChild(js2);
// Optional callback on script load failure
if (onLoadErrorCallback) onLoadErrorCallback();
};
document.head.appendChild(js);
}

This was very simple now that I realize how to do it, thanks to all the answers for leading me to the solution. I had to abandon $.getScript() in order to specify the source of the script...sometimes doing things manually is best.
Solution
//great suggestion #Jasper
var len = $('script[src*="Javascript/MyScript.js"]').length;
if (len === 0) {
alert('script not loaded');
loadScript('Javascript/MyScript.js');
if ($('script[src*="Javascript/MyScript.js"]').length === 0) {
alert('still not loaded');
}
else {
alert('loaded now');
}
}
else {
alert('script loaded');
}
function loadScript(scriptLocationAndName) {
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = scriptLocationAndName;
head.appendChild(script);
}

Create the script tag with a specific ID and then check if that ID exists?
Alternatively, loop through script tags checking for the script 'src' and make sure those are not already loaded with the same value as the one you want to avoid ?
Edit: following feedback that a code example would be useful:
(function(){
var desiredSource = 'https://sitename.com/js/script.js';
var scripts = document.getElementsByTagName('script');
var alreadyLoaded = false;
if(scripts.length){
for(var scriptIndex in scripts) {
if(!alreadyLoaded && desiredSource === scripts[scriptIndex].src) {
alreadyLoaded = true;
}
}
}
if(!alreadyLoaded){
// Run your code in this block?
}
})();
As mentioned in the comments (https://stackoverflow.com/users/1358777/alwin-kesler), this may be an alternative (not benchmarked):
(function(){
var desiredSource = 'https://sitename.com/js/script.js';
var scripts = document.getElementsByTagName('script');
var alreadyLoaded = false;
for(var scriptIndex in document.scripts) {
if(!alreadyLoaded && desiredSource === scripts[scriptIndex].src) {
alreadyLoaded = true;
}
}
if(!alreadyLoaded){
// Run your code in this block?
}
})();

Simply check if the global variable is available, if not check again. In order to prevent the maximum callstack being exceeded set a 100ms timeout on the check:
function check_script_loaded(glob_var) {
if(typeof(glob_var) !== 'undefined') {
// do your thing
} else {
setTimeout(function() {
check_script_loaded(glob_var)
}, 100)
}
}

Another way to check an external script is loaded or not, you can use data function of jquery and store a validation flag. Example as :
if(!$("body").data("google-map"))
{
console.log("no js");
$.getScript("https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false&callback=initilize",function(){
$("body").data("google-map",true);
},function(){
alert("error while loading script");
});
}
}
else
{
console.log("js already loaded");
}

I think it's better to use window.addEventListener('error') to capture the script load error and try to load it again.
It's useful when we load scripts from a CDN server. If we can't load script from the CDN, we can load it from our server.
window.addEventListener('error', function(e) {
if (e.target.nodeName === 'SCRIPT') {
var scriptTag = document.createElement('script');
scriptTag.src = e.target.src.replace('https://static.cdn.com/', '/our-server/static/');
document.head.appendChild(scriptTag);
}
}, true);

Merging several answers from above into an easy to use function
function GetScriptIfNotLoaded(scriptLocationAndName)
{
var len = $('script[src*="' + scriptLocationAndName +'"]').length;
//script already loaded!
if (len > 0)
return;
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = scriptLocationAndName;
head.appendChild(script);
}

My idead is to listen the error log if there is an error on script loading.
const checkSegmentBlocked = (e) => {
if (e.target.nodeName === 'SCRIPT' && e.target.src.includes('analytics.min.js')) {
window.isSegmentBlocked = true;
e.target.removeEventListener(e.type, checkSegmentBlocked);
}
};
window.addEventListener('error', checkSegmentBlocked, true);

Some answers on this page are wrong. They check for the existence of the <script> tag - but that is not enough. That tells you that the tag was inserted into the DOM, not that the script is finished loading.
I assume from the question that there are two parts: the code that inserts the script, and the code that checks whether the script has loaded.
The code that dynamically inserts the script:
let tag = document.createElement('script');
tag.type = 'text/javascript';
tag.id = 'foo';
tag.src = 'https://cdn.example.com/foo.min.js';
tag.onload = () => tag.setAttribute('data-loaded', true); // magic sauce
document.body.appendChild(tag);
Some other code, that checks whether the script has loaded:
let script = document.getElementById('foo');
let isLoaded = script && script.getAttribute('data-loaded') === 'true';
console.log(isLoaded); // true
If the both of those things (inserting and checking) are in the same code block, then you could simplify the above:
tag.onload = () => console.log('loaded');

I found a quick tip before you start diving into code that might save a bit of time. Check devtools on the webpage and click on the network tab. The js scripts are shown if they are loaded as a 200 response from the server.

How can I load jQuery if it is not already loaded?

I have a initializor.js that contains the following:
if(typeof jQuery=='undefined')
{
var headTag = document.getElementsByTagName("head")[0];
var jqTag = document.createElement('script');
jqTag.type = 'text/javascript';
jqTag.src = 'jquery.js';
headTag.appendChild(jqTag);
}
I am then including that file somewhere on another page. The code checks if jQuery is loaded, and if it isn't, adds it to the Head tag.
However, jQuery is not initializing, because in my main document, I have a few events declared just to test this. I also tried writing some jQuery code below the check, and Firebug said:
"jQuery is undefined".
Is there a way to do this? Firebug shows the jquery inclusion tag within the head tag!
Also, can I dynamically add code into the $(document).ready() event? Or wouldn't it be necessary just to add some Click events to a few elements?

jQuery is not available immediately as you are loading it asynchronously (by appending it to the <head>). You would have to add an onload listener to the script (jqTag) to detect when it loads and then run your code.
e.g.
function myJQueryCode() {
//Do stuff with jQuery
}
if(typeof jQuery=='undefined') {
var headTag = document.getElementsByTagName("head")[0];
var jqTag = document.createElement('script');
jqTag.type = 'text/javascript';
jqTag.src = 'jquery.js';
jqTag.onload = myJQueryCode;
headTag.appendChild(jqTag);
} else {
myJQueryCode();
}

To include jQuery you should use this:
<script src="//ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>window.jQuery || document.write('<script src="jquery.js">\x3C/script>')</script>
it uses the Google CDN but provides a fallback an has a protocol relative URL.
Note: Be sure to change the version number to the latest version
if window.jQuery is defined, it will not continue to read the line since it is an or that already contains a true value, if not it wil (document.)write the value
see: theHTML5Boilerplate
also: you forgot the quotes, if jQuery is not defined:
typeof window.jQuery === "undefined" //true
typeof window.jQuery == undefined //false ,this is wrong
you could also:
window.jQuery === undefined //true

If you're in an async function, you could use await like this:
if(!window.jQuery){
let script = document.createElement('script');
document.head.appendChild(script);
script.type = 'text/javascript';
script.src = "//ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js";
await script.onload
}
/* Your jQuery code here */
If you're not, you can use (async function(){/*all the code*/})() to wrap and run all the code inside one
.
Alternatively, refactoring Adam Heath's answer (this is more readable IMO). Bottom line, you need to run the jQuery code AFTER jQuery finished loading.
jQueryCode = function(){
// your jQuery code
}
if(window.jQuery) jQueryCode();
else{
var script = document.createElement('script');
document.head.appendChild(script);
script.type = 'text/javascript';
script.src = "//ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js";
script.onload = jQueryCode;
}
Or you could also wrap it in a function to change the order of the code
function runWithJQuery(jQueryCode){
if(window.jQuery) jQueryCode();
else{
var script = document.createElement('script');
document.head.appendChild(script);
script.type = 'text/javascript';
script.src = "//ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js";
script.onload = jQueryCode;
}
}
runWithJQuery(function jQueryCode(){
// your jQuery code
})

The YepNope loader can be used to conditionally load scripts, has quite a nice, easy to read syntax, they have an example of just this on their website.
You can get it from their website.
Example taken from their website:
yepnope([{
load: 'http:/­/ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js',
complete: function () {
if (!window.jQuery) {
yepnope('local/jquery.min.js');
}
}
}

This site code is solved my problem.
function loadjQuery(url, success){
var script = document.createElement('script');
script.src = url;
var head = document.getElementsByTagName('head')[0],
done = false;
head.appendChild(script);
// Attach handlers for all browsers
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);
}
};
}
if (typeof jQuery == 'undefined'){
loadjQuery('http://code.jquery.com/jquery-1.10.2.min.js', function() {
// Write your jQuery Code
});
} else {
// jQuery was already loaded
// Write your jQuery Code
}
http://99webtools.com/blog/load-jquery-if-not-already-loaded/

This is old post but I create one workable solution tested on various places.
Here is the code.
<script type="text/javascript">
(function(url, position, callback){
// default values
url = url || 'https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js';
position = position || 0;
// Check is jQuery exists
if (!window.jQuery) {
// Initialize <head>
var head = document.getElementsByTagName('head')[0];
// Create <script> element
var script = document.createElement("script");
// Append URL
script.src = url;
// Append type
script.type = 'text/javascript';
// Append script to <head>
head.appendChild(script);
// Move script on proper position
head.insertBefore(script,head.childNodes[position]);
script.onload = function(){
if(typeof callback == 'function') {
callback(jQuery);
}
};
} else {
if(typeof callback == 'function') {
callback(jQuery);
}
}
}('https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js', 5, function($){
console.log($);
}));
</script>
Explanation you can find HERE.