preventdefault | 易学教程

Ctrl+S preventDefault in Chrome

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问题 I Want to catch Ctrl + S in Chrome, and prevent the default browser behavior to save the page. How? (Just posting the question & answer as I was after this for a pretty long time and didn't find a solution) 回答1: As far as I can see, the secret sauce is, that Ctrl + S does NOT fire the keypress event, only the keydown event. Using jQuery.hotkeys: $(document).bind('keydown', 'ctrl+s', function(e) { e.preventDefault(); alert('Ctrl+S'); return false; }); Only with jQuery: $(document).bind(

What is the opposite of evt.preventDefault();

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Once I've fired an evt.preventDefault() , how can I resume default actions again? Grant Thomas As per commented by @Prescott, the opposite of: evt.preventDefault(); Could be: Essentially equating to 'do default' , since we're no longer preventing it. Otherwise I'm inclined to point you to the answers provided by another comments and answers: How to unbind a listener that is calling event.preventDefault() (using jQuery)? How to reenable event.preventDefault? Note that the second one has been accepted with an example solution, given by redsquare (posted here for a direct solution in case this

event.preventDefault vs event.stopPropagation [duplicate]

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问题 This question already has answers here : What's the difference between event.stopPropagation and event.preventDefault? (7 answers) Closed 6 years ago . Can someone explain what's the difference between event.preventDefault() and event.stopPropagation() ? I have a table and within that table I have an img tag. When I click the img tag, I want to see a popup. But I also want to stop the selection of multiple rows, so I use: $("table.items tbody tr").click(function(event) { event.stopPropagation

Can't prevent `touchmove` from scrolling window on iOS

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问题 We are trying to scroll an element on our iOS web app while preventing the window itself from scrolling. We are capturing the touchmove event on the window, scrolling the element programmatically and (trying to) prevent the window itself from scroll by calling preventDefault on the event. Unfortunately this doesn't work in Mobile Safari. The window continues to scroll underneath our element. The issue sounds exactly like the Webkit bug described in https://bugs.webkit.org/show_bug.cgi?id

React onClick and preventDefault() link refresh/redirect?

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问题 I'm rendering a link with react: render: -> `<a className="upvotes" onClick={this.upvote}>upvote</a>` Then, above I have the upvote function: upvote: -> // do stuff (ajax) Before link I had span in that place but I need to switch to link and here's the trouble - every time I click on .upvotes the page gets refreshed, what I've tried so far: event.preventDefault() - not working. upvote: (e) -> e.preventDefault() // do stuff (ajax) event.stopPropagation() - not working. upvote: (e) -> e

PreventDefault alternative for IE8

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问题 Situation : Trying to modify VideoJS.com in order to work with IE8 and Youtube Chromeless API. Problem : Progressbar dragging doesn't work (error on event.preventDefault(); 'not supported' according to debug) Demo : http://alpha.dealertouch.mobi/video/demo.html What I tried : Skip 'preventDefault' when it's IE, but if I do that I'll lose the functionality of the progressbar (drag/click forward and backward) Question : What is the best way to solve this problem for IE8? 回答1: I use something

Stop form from submitting , Using Jquery

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I'm trying to stop my form from submitting if a validation fails. I tried following this previous post but I doesn't work for me. What am I missing? <input id="saveButton" type="submit" value="Save" /> <input id="cancelButton" type="button" value="Cancel" /> <script src="../../Scripts/jquery-1.4.1-vsdoc.js" type="text/javascript"></script> <script type="text/javascript"> $(document).ready(function () { $("form").submit(function (e) { $.ajax({ url: '@Url.Action("HasJobInProgress", "ClientChoices")/', data: { id: '@Model.ClientId' }, success: function (data) { showMsg(data, e); }, cache: false }

Bootstrap 3 - disable navbar collapse

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This is my simple navbar: <div class="navbar navbar-fixed-top myfont" role="navigation"> <div class=""> <ul class="nav navbar-nav navbar-left"> <li> <a class="navbar-brand" href="#"> <img src="assets/img/logo.png"/> </a> </li> <li> <button class="btn btn-navbar"> <i class="fa fa-edit"></i> Create </button> </li> </ul> </div> <ul class="nav navbar-nav navbar-right"> <li data-match-route="/"><a href="#/page-one">Login</a></li> <li data-match-route="/"><a href="#/page-two/sub-a">Signup</a></li> </ul> </div> I just would like to prevent this to collapse, cause I don't need it, how to do? I would

How to preventDefault on anchor tags?

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Let's say I have an anchor tag such as <a href="#" ng-click="do()">Click</a> How can I prevent the browser from navigating to # in AngularJS ? UPDATE : I've since changed my mind on this solution. After more development and time spent working on this, I believe a better solution to this problem is to do the following: <a ng-click="myFunction()">Click Here</a> And then update your css to have an extra rule: a[ng-click]{ cursor: pointer; } Its much more simple and provides the exact same functionality and is much more efficient. Hope that might be helpful to anyone else looking up this solution

event.preventDefault() vs. return false (no jQuery)

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I wondered if event.preventDefault() and return false were the same. I have done some tests , and it seems that If the event handler is added using old model, for example elem.onclick = function(){ return false; }; Then, return false prevents default action, like event.preventDefault() . If the event handler is added using addEventListener , for example elem.addEventListener( 'click', function(e){ return false; }, false ); Then, return false doesn't prevent the default action. Do all browsers behave like this? Are there more differences between event.preventDefault() and return false ? Where I