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In JavaScript, when I want to run a script once when the page has loaded, should I use window.onload or just write the script? For example, if I want to have a pop-up, should I write (directly inside the <script> tag): alert("hello!"); Or: window.onload = function() { alert("hello!"); } Both appear to run just after the page is loaded.
The onload event can be used to check the visitor's browser type and browser version, and load the proper version of the web page based on the information. The onload event can also be used to deal with cookies (see "More Examples" below).
26 lip 2024 · Syntax. Use the event name in methods like addEventListener(), or set an event handler property. js. addEventListener("load", (event) => {}); onload = (event) => {}; Event type. A generic Event. Examples. Log a message when the page is fully loaded: js. window.addEventListener("load", (event) => { . console.log("page is fully loaded"); });
The load event occurs when the document has been completely loaded, including dependent resources like JavaScript files, CSS files, and images. The <img> and <script> elements also support the load event. Use the addEventListener() method to register an onload event handler.
13 gru 2023 · Method 2: Using window.onload. The window object represents the browser window. The onload property processes load events after the element has finished loading. This is used with the window element to execute a script after the webpage has completely loaded.
Resource loading: onload and onerror. The browser allows us to track the loading of external resources – scripts, iframes, pictures and so on. There are two events for it: onload – successful load, onerror – an error occurred.
14 paź 2022 · window.onload. The load event on the window object triggers when the whole page is loaded including styles, images and other resources. This event is available via the onload property. The example below correctly shows image sizes, because window.onload waits for all images:
