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How to load JS at the very end

after hours of research I did not find a way to execute my JS script after the script that creates the popup "Just a Moment" ( http://wpd-test2.onlinegurus.de/wpd/design/8/ )
Is there a way to make sure my JS script is executes after the "Just a moment" JS?
Thanks in advance,
Ben

Well, you can do it only if you control the "just a moment" script. You can do a trick to activate a script when you load another. Like this:
function loadScript( url, callback ) {
var script = document.createElement( "script" )
script.type = "text/javascript";
if(script.readyState) { //IE
script.onreadystatechange = function() {
if ( script.readyState === "loaded" || script.readyState === "complete" ) {
script.onreadystatechange = null;
callback();
}
};
} else { //Others
script.onload = function() {
callback();
};
}
script.src = url;
document.getElementsByTagName( "head" )[0].appendChild( script );
}
You can test it with
loadScript(PathToJustAMoment, function() {
alert('script ready!');
});

will setting the onload attribute after an element is loaded still run the handler?

What is supposed to happen if you set the onload attribute of an element after it has already loaded? Is the handler executed immediately or is it ignored?

Nothing. It is ignored. Events happen when they happen, event handlers that aren't bound in time don't fire.

can you just given an example for it that you asking about , in my thinking this code may helps you :
function loadScript(url, callback){
var script = document.createElement("script")
script.type = "text/javascript";
if (script.readyState){ //IE
script.onreadystatechange = function(){
if (script.readyState == "loaded" ||
script.readyState == "complete"){
script.onreadystatechange = null;
callback();
}
};
} else { //Others
script.onload = function(){
callback();
};
}
script.src = url;
document.getElementsByTagName("head")[0].appendChild(script);
}
<script type="text/javascript" src="http://your.cdn.com/first.js"></script>
<script type="text/javascript">
loadScript("http://your.cdn.com/second.js", function(){
//initialization code
});
</script>

Javascript resource not loading in ie7

I have a whole bunch of javascript files I need to load in order. However, one of them is not loading in ie7.
Here's the function that does the loading:
function loadScript(url, callback){
var head = document.getElementsByTagName("head")[0];
var script = document.createElement("script");
script.src = url;
// Attach handlers for all browsers
var done = false;
script.onload = script.onreadystatechange = function()
{
if( !done && ( !this.readyState
|| this.readyState == "loaded"
|| this.readyState == "complete") )
{
done = true;
// Continue your code
callback();
// Handle memory leak in IE
script.onload = script.onreadystatechange = null;
head.removeChild( script );
}
};
head.appendChild(script);
}
And the function calls:
loadScript('http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js',function(){
loadScript('http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/jquery-ui.min.js',function(){
loadScript('http://XXX/js/data.php?rand='+Math.random(),function(){
loadScript('http://XXX/js/jquery.inject.js?rand='+Math.random(),function(){
console.log('a');
loadScript('XXX/js/press.js?rand='+Math.random(),function(){
console.log('b');
inject_press();
});
});
});
});
});
The file that doesn't load i jquery.inject.js, whos code is
console.log('y');
jQuery.prototype.inject = function(a){
...
}
Again this works in all browsers except ie7. The output is
a
b

This is not the best way how to load ECMAscript files. I would name that files to sort them and then load using ASP.NET 4.5 bundling.

load jQuery in another js file

I have a JavaScript file, which also uses jQuery in it too. To load it, I wrote this code:
function include(filename)
{
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.src = filename;
script.type = 'text/javascript';
head.appendChild(script)
}
include('http://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js');
alert("1");
$(document).read(function(){});
alert("2");
This fires alert("1"), but the second alert doesn't work. When I inspect elements, I see an error which says that $ in not defined.
How should I solve this problem?

You need to execute any jQuery specific code only once the script is loaded which obviously might happen at a much later point in time after appending it to the head section:
function include(filename, onload) {
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.src = filename;
script.type = 'text/javascript';
script.onload = script.onreadystatechange = function() {
if (script.readyState) {
if (script.readyState === 'complete' || script.readyState === 'loaded') {
script.onreadystatechange = null;
onload();
}
}
else {
onload();
}
};
head.appendChild(script);
}
include('http://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js', function() {
$(document).ready(function() {
alert('the DOM is ready');
});
});
And here's a live demo.
You may also take a look at script loaders such as yepnope or RequireJS which make this task easier.

The problem here is probably that, even though you include the script, it doesn't mean it is loaded when you try to do $(document).ready(function(){});. You could look into Google Loader to prevent this problem http://code.google.com/intl/fr-FR/apis/loader/

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.