preventdefault | 易学教程

Does using event.preventDefault() in “mousedown” prevent “click” or “mouseup” event in jquery?

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I am new to jquery and i have a doubt whether using events.preventDefault() in the mousedown or mouseup events does prevent the click or dblclick event? Please provide me a clarification or a sample. Thanks in advance. Madhu Neither of mouseup or mousedown prevent the default click event. Fiddle Demo You need to use click() : $('.test').on('click', function(e) { e.preventDefault(); }); Fiddle Demo It does not prevent the event itself, but the action that is triggered by the event. A simple example would be clicking on an anchor link. The default action of the click event is to take the browser

Is there an opposite function of preventDefault() in JavaScript?

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I am counting words in a text field and after a certain amount of words, I use prevent default. In the else, I would like to re-enable the default commands. Does preventDefault( ) have an opposite function? Here is some sample code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>preventDefault</title> <style type="text/css"></style> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script> <script type="text

Prevent scrolling on mobile browser, without preventing input focusing

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I use preventDefault() on touchstart on the document to prevent scrolling on a page. Unfortunately this prevents too much. The user can no longer give focus to an input (and open the soft keyboard). Using jQuery focus(), I can give the focus to the input on a touchstart. This opens the soft keyboard on iOS (most of the time), but never on Android. Background : I have a webpage that I want to make as much like a mobile app as possible. I'm only really concerned with Android and iOS, but any form factor. I start by making the content in the page exactly the same size as the screen size. This is

Why does preventDefault() on a parent element's click 'disable' a checkbox?

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I encountered this situation recently (simplified here). Simply wrap a checkbox with an element and apply preventDefault() on it's click event and the checkbox becomes uncheckable. See this fiddle , but here's a snip: <div> <input type="checkbox"/> </div> /* Wrapper could be any element (and any ancestor element will work) */ $('div').on('click', function(e){ e.preventDefault(); }); /* Uncomment to make the checkbox work again $('input').on('click', function(e){ e.stopPropagation(); }); */ The behavior occurs in Chrome and FF, so I assume it is intentional. Why does the click event, which has

Cross browser preventDefault() without jQuery

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问题 I wrote this bind method and am having an issue in my preventDefault() method to work in IE. The callback line never executes. Can someone provide assistance? Thanks! var preventDefault = function (event) { if (window.event) { window.event.returnValue = false; } else if (event.preventDefault) { event.preventDefault(); } else { event.returnValue = false; } }; var bindEvent = function (ele, type, cb) { if (window.addEventListener) { ele.addEventListener(type, cb, false); } else if (window

Does using event.preventDefault() in “mousedown” prevent “click” or “mouseup” event in jquery?

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问题 I am new to jquery and i have a doubt whether using events.preventDefault() in the mousedown or mouseup events does prevent the click or dblclick event? Please provide me a clarification or a sample. Thanks in advance. Madhu 回答1: Neither of mouseup or mousedown prevent the default click event. Fiddle Demo You need to use click() : $('.test').on('click', function(e) { e.preventDefault(); }); Fiddle Demo 回答2: It does not prevent the event itself, but the action that is triggered by the event. A

Prevent scrolling on mobile browser, without preventing input focusing

阅读更多关于 Prevent scrolling on mobile browser, without preventing input focusing

问题 I use preventDefault() on touchstart on the document to prevent scrolling on a page. Unfortunately this prevents too much. The user can no longer give focus to an input (and open the soft keyboard). Using jQuery focus(), I can give the focus to the input on a touchstart. This opens the soft keyboard on iOS (most of the time), but never on Android. Background : I have a webpage that I want to make as much like a mobile app as possible. I'm only really concerned with Android and iOS, but any

jquery select dropdown ignores keydown event when it's opened?

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I'm trying to prevent backspace button to go one page back in every browser. For now I'm using this code: $(document).on("keydown", function (e) { if (e.which === 8 && !$(e.target).is("input, textarea")) { e.preventDefault(); } }); It works fine for everything except when a select field dropdown list is opened , this event is ignored and a backspace takes me one page back anyway. How can I solve this problem? Thank you for your answers. Just for the info, this is Google Chrome specific since your code works fine in IE and FF. If you really need this to work you could render a fake dropdown and

Why does preventDefault() on a parent element's click 'disable' a checkbox?

阅读更多关于 Why does preventDefault() on a parent element's click 'disable' a checkbox?

问题 I encountered this situation recently (simplified here). Simply wrap a checkbox with an element and apply preventDefault() on it's click event and the checkbox becomes uncheckable. See this fiddle, but here's a snip: <div> <input type="checkbox"/> </div> /* Wrapper could be any element (and any ancestor element will work) */ $('div').on('click', function(e){ e.preventDefault(); }); /* Uncomment to make the checkbox work again $('input').on('click', function(e){ e.stopPropagation(); }); */ The

how to prevent focus event in IE when mousedown happens

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event.preventDefault(); return false; event.stopPropagation(); any of them can prevent focus event from happening when I trigger a mousedown event in Firefox and chrome, but it failed in IE.In fact,chrome has another problem. when mousedowning, :hover css is not working. ` <input type="text" id="name"> <div id="suggest"> <div>mark</div> <div>sam</div> <div>john</div> </div> $("#name").focus(suggest.show).blur(suggest.hide); ` what I expected is, when I click the sub div, such as "sam",and then $("#name").val("sam"). but the problem is, when I press the mouse(just mousedown,not released), the $

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