In javascript which method cancels event default behavior

Instructor: [0:00] If an event is cancellable, then it can be cancelled by event listeners. Cancelling an event is a way to opt out of the default behavior associated with an event. [0:09] I'm going to come over to my event target so I'm going to add some event listeners. In this event listener, I'm going to cancel the event using prevent default. I'll speak more about prevent default soon, but for now all you need to know is that we are cancelling the event. [0:24] If I come up here and I dispatch the event, we'll see that even though this event listener did in fact cancel the event, the event continued to flow through the event path and all of the subsequent event listeners were still executed. [0:39] In my example application, I'm going to add a hyperlink to my DOM events.dev visualizer. When I click on the hyperlink, it will navigate to that visualizer. [0:52] Events have an internal cancelled flag. When an event is created, the internal cancelled flag is set to false. If an event is cancelled, then the internal cancelled flag is set to true. The clearest way to cancel an event is using the event.preventDefault method. [1:11] Here, I'm using the querySelector API to get access to our anchor element, and then adding a click eventListener to the anchor, which is going to execute this onClick function, which we'll call, event.preventDefault. When I come over to my app and I click the hyperlink, you'll see that I'm no longer navigating to that DOM Events.div url. [1:33] Th...

Nope. Once the event has been canceled, it is canceled. You can re-fire the event later on though, using a flag to determine whether your custom code has already run or not - such as this (please ignore the blatant namespace pollution): var lots_of_stuff_already_done = false; $('.button').on('click', function(e) ); A more recent version of the accepted answer. Brief version: $('#form').on('submit', function(e, options) ); Override the property isDefaultPrevented like this: $('a').click(function(evt) IMHO, this is most complete way of retriggering the event with the exactly same data. don't know why this answer was not upvoted more, this is really useful. Works with propagation stops too with event.isPropagationStopped = function();. I also added a custom property to the event so that I can detect in the handler if the check that prevented the action was done so it's not made again. Great! I used for Bootstrap 4 Tabs, It worked perfectly fine. Many Thanks. $('#v-pills-tab a').on('click', function (e) ); Just don't perform e.preventDefault();, or perform it conditionally. You certainly can't alter when the original event action occurs. If you want to "recreate" the original UI event some time later (say, in the callback for an AJAX request) then you'll just have to fake it some other way (like in vzwick's answer)... though I'd question the usability of such an approach. The approach I use is this: $('a').on('click', function(event)); as long as "lots of stuff" isn't doing so...

Forward to: http://www.cnblogs.com/fibonaccixue/p/5340279.html 1. Event handler Normally, a return value of false tells the browser not to perform the default action associated with this event. For example, the onclick event handler of the form submit button can prevent the browser from submitting the form by returning false, and the onclick event handler of the a tag can prevent jumping to the href page by returning false. Similarly, the onkeypress event handler on the input field can filter keyboard input by returning false if the user enters inappropriate characters. 事件处理程序的返回值只对通过属性注册的处理程序才有意义。 • call sequence A document element or other object can register multiple event handlers for a given event type. When the appropriate event occurs, the browser must call all event handlers according to the following rules: Handlers registered by setting object properties or HTML attributes are always called first. Handlers registered with addEventListener() are called in the order in which they were registered. Handlers registered with attachEvent() may be called in any order, so code should not depend on the calling order. • Event Propagation Most events "bubble up" to the root of the DOM tree after calling the event handler registered on the target element. Calls the event handler of the target's parent element, and then calls the event handler registered on the target's grandparent element. This goes all the way to the Document object and finally to the Window object. Most eve...