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We have several JavaScript files which we load at the bottom of the master page. However, I have the situation that I need to perform some JavaScript before the other scripts are loaded. Is it possible to wait till all the JavaScript files are loaded and then execute some JavaScript code?
I thought $(document).ready() did this, but as it turns out, it doesn't. Of course we can move the script files from the bottom to the top, but I am wondering if it's possible what I want.
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If I'm understanding your question I think you're asking if it matters where in a file a function/method is defined, and the answer is no, you can define them anywhere in a single source file. The JavaScript parser will read in all symbols before trying to run the code.
You can run javascript code at any time. AFAIK it is executed at the moment the browser reaches the <script> tag where it is in. But you cannot access elements that are not loaded yet.
Because of the fact that browsers have to pause displaying content of a page when it's parsing a Javascript file, the recommendation is to load the Javascript at the bottom of the page to speed up displaying a page's content.
What is the best way to make sure javascript is running when page is fully loaded? If you mean "fully loaded" literally, i.e., all images and other resources downloaded, then you have to use an onload handler, e.g.: window. onload = function() { // Everything has loaded, so put your code here };
In JavaScript, we can wait 5 seconds before executing a function or some code with the use of the setTimeout method. Skip to primary navigation Skip to main content Skip to primary sidebar The Programming Expert Solving All of Your Programming Headaches HTML JavaScript jQuery PHP Python SAS VBA About
It does not seem to wait for all other JS files to have executes, at least not in Firefox. Like the doc says, defer script loads when the page is parsed (instead of when js/css is loaded). This ain't a solution. Works very well with both async and defer while loading on scripts.
We will use JavaScript to wait 5 seconds using the setTimeout() method. While we are waiting for the 5 seconds, we will provide the user with a countdown by using the setInterval() method. The setInterval() method will run every second until it is told to stop. Inside the setInterval()method, we will run a function that runs every second.
The plain old JavaScript equivalent is: window.addEventListener ('load', function () { /* your code here */ }). does this appends the execution stack or replaces the old one? $.getScript ("my_lovely_script.js", function () { alert ("Script loaded and executed."); // here you can use anything you defined in the loaded script });
You can use
$(window).on('load', function() { // your code here }); Which will wait until the page is loaded. $(document).ready() waits until the DOM is loaded.
In plain JS:
window.addEventListener('load', function() { // your code here }) You can use .getScript() and run your code after it loads:
$.getScript("my_lovely_script.js", function(){ alert("Script loaded and executed."); // here you can use anything you defined in the loaded script }); You can see a better explanation here: How do I include a JavaScript file in another JavaScript file?
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