This parameter is an object which contains various information about the event such as the target id. Events are normally used in combination with functions, and the function will not be executed before the event occurs (such as when a user clicks a button). The addEventListener() method attaches an event handler to the specified element. addEventListener () Method. If you haven’t already created an account, you will be prompted to do so after signing in. Tip: Use the document.addEventListener() method to attach an event handler to the document. Once the event fires, you can safely make calls to Cordova APIs. We already mentioned load and click events. jQuery.ready / DOMContentLoaded occurs when all of the HTML is ready to interact with, but often before its been rendered to the screen. the issue with this bug is that document.body.addEventListener does not work while document.addEventListener will work. A description of the DOMContentLoaded event and why it may be preferable to use over the window.onload event. Definition and Usage. in Chrome 46 and Firefox 42, and it’s not working. jQuery detects this state of readiness for you. This event doesn’t wait for the completion of the loading of add-ons such as stylesheets, sub-frames and images/pictures. There are better ways in Angular, see yourself. A different event, load, should be used only to detect a fully-loaded page. Only capture load listeners might be invoked, but due to the load of a sub-resource like a stylesheet, not due to the load of the document itself. While it is totally possible to directly access the document object and hook up some listener, it is not suggested. HTML DOM events allow JavaScript to register different event handlers on elements in an HTML document. A page can't be manipulated safely until the document is "ready." This event doesn’t wait for the completion of the loading of add-ons such as stylesheets, sub-frames and images/pictures. The deviceready … '); }); document.getElementsByTagName('body')[0].appendChild(iframe); 我没有在IE中测试过 attachEvent。 The deviceready event fires once Cordova has fully loaded. Document Object. button.addEventListener('click', (e)=>{ console.log(e.target.id) }) Here the event parameter is a variable named e but it can be easily called anything else such as "event". document. Tip: Use the removeEventListener() method to remove an event handler that has been attached with the addEventListener() method. © 2005-2020 Mozilla and individual contributors. document.body[window.addEventListener ? : "on"; var eventName = window.addEventListener ? Also, this stack overflow answer was useful up to a point but given my understanding of the MSN docs linked above I'm still confused. document.getElementById("demo").innerHTML = "Hello World"; … to finish loading. I can get it to work if I try it on window, as in, The MDN documentation for the “load” event says. When the user clicks anywhere in the document, output "Hello World" in a

element with id="demo": document.addEventListener("click", function() {. It is a common mistake to use load where DOMContentLoaded would be more appropriate. "addEventListener" : "attachEvent"; document.body[eventName](prefix + "load", init, … DOMContentLoaded may fire before your script has a chance to run, so it is wise to check before adding a listener. This new event is triggered before the load event so you don't have to wait for the entire page to load. A bubble load event listener (including onload event handler) in document should never be invoked. The DOMContentLoaded event fires when the initial HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subframes to finish loading. body.addEventListener("load", init, false); However, if you want it to work on IE<9 as well you can use: var prefix = window.addEventListener ? "" I recently got asked by an Angular community member on Twitter how one can register an event on the document object. The addEventListener() method attaches an event handler to the specified element. Because the DOM has not been loaded when the JavaScript engine parses the JavaScript in the head, the button with the id btn does not exist. }); The DOMContentLoaded event is fired when the initial HTML document has been completely loaded and parsed, without waiting for stylesheets, images, frame etc. 「load」はイベントターゲット「window」にセットします。 サンプルではページ全体が読み込まれたら「overlook」の文字が表示されます。 JavaScript var s2 = document.getElementById(' sample2 '); window.addEventListener(' load ', function(){ s2.innerHTML = ' overlook '; }, false); Result After editing a form in InfoPath for use on a SharePoint 2010 site, my page will no longer load on IE11. https://html.spec.whatwg.org/multipage/indices.html#events-2. Checking whether loading is already complete ; Use setTimeout to allow the page to be rendered before your … If loaded as usual, stylesheets slow down DOM parsing as they're loaded in parallel, "stealing" traffic from the main HTML document. inDiv.addEventListener("click", function { info.innerHTML += "inDiv" + "
"; }, false); 上述是我们测试的代码，根据 info 的显示来确定触发的顺序，有三个 addEventListener，而 useCapture 可选值为 true 和 false，所以 2*2*2，可以得出 8 段不同的程序。 load event listeners (including onload event handler) of window. bug 99820 is about setting onload and onunload handlers using DOM Events syntax which is not the problem in this bug since he is setting the event handlers in the attribute defined onload handler init(). 「load」はイベントターゲット「window」にセットします。 サンプルではページ全体が読み込まれたら「overlook」の文字が表示されます。 JavaScript var s2 = document.getElementById(' sample2 '); window.addEventListener(' load ', function(){ s2.innerHTML = ' overlook '; }, false); Result Get the latest and greatest from MDN delivered straight to your inbox. Applications typically attach an event listener with document.addEventListener once the HTML document's DOM has loaded. This element exists as part of the Document Object Model (DOM) and you may wish to learn about how to select a DOM element. So why doesn’t it work on the document? First of all, you should access the body element through document.body.However, onload is defined on window, so you actually need: window.onload = init(); However, that would execute the init() method and store the return value in window.onload.Obviously, that's not what you want: you want the init function to act as onload handler. こんにちは、ライターのマサトです！ 今回は、JavaScriptでさまざまなイベント処理を実行することが可能な「addEventListener()」について学習していきましょう！ この記事では、 「addEventListener()」とは？ 「addEventListener()」の使い方 主要なイベントリスナー Syntax: document.addEventListener("DOMContentLoaded", function(e) { console.log("GfG page has loaded"); }); inDiv.addEventListener("click", function { info.innerHTML += "inDiv" + "
"; }, false); 上述是我们测试的代码，根据 info 的显示来确定触发的顺序，有三个 addEventListener，而 useCapture 可选值为 true 和 false，所以 2*2*2，可以得出 8 段不同的程序。 var iframe = document.createElement('iframe'); iframe.addEventListener('load', function() { console.log('loaded! On all other browsers, it is fine, but before the page can load in IE11, I receive a "Critical Error" message that states: "Object doesn't support property or method 'addEventListener'". load event listeners (including onload event handler) of window; A bubble load event listener (including onload event handler) in document should never be invoked. Code included inside $( window ).on( "load", function() { ... }) will run once the entire page (images or iframes), not just the DOM, is ready. At a Glance. Content is available under these licenses. I'm looking for an explanation as to why window.addEventListener works on the following script but not document.addEventListener.I've had a look at the MSN docs for the load event and from what I can gather it should work. DocumentオブジェクトはDOMツリーを読み込んでいきます。解析が終わるとDOMContentLoadedイベントが発火されます。 ... window. event: a string that specifies the name of the event. Tip: Use the document.addEventListener() method to attach an event handler to the document. Script tags have access to any element which appears before them in the HTML. Download my free JavaScript Beginner's Handbook. document.addEventListener('load', handler) in Chrome 46 and Firefox 42, and it’s not working. Download my free JavaScript Beginner's Handbook. window.addEventListener('load', handler) The MDN documentation for the “load” event says. The onload event can also be used to deal with cookies (see "More Examples" below). 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. Sign in to enjoy the benefits of an MDN account. ; The load event occurs when all of the HTML is loaded, and any subresources like images are loaded. The spec states that it is fired at window and at certain (special) elements like : Fired at the Window when the document has finished loading; fired at an element containing a resource (e.g. Attach a click event to the document. I'm looking for an explanation as to why window.addEventListener works on the following script but not document.addEventListener.I've had a look at the MSN docs for the load event and from what I can gather it should work. DOMContentLoaded event gets executed once the basic HTML document is loaded and its parsing has taken place.