javascript-events

问题 How can I detect when the document changes? I know I could do something like this: var lastHTML = document.body.innerHTML; setInterval(function() { if(document.body.innerHTML != lastHTML) { DOMupdated() } }, 500); But is there an event handler I can put in place, like onchange? 回答1: There's the old DOM Mutation Events , and there's the new DOM Mutation Observers . For a quick overview of them both (and why the newer [more complex] API is better), check out this post: Detect DOM Changes with

问题 Is there a way that I can call $(selector).bind('click', handler) or $(selector).on('click', handler) multiple times such that the handler only gets attached once? Right now, I have multiple AJAX handlers with different success callbacks, each of which re-renders a different set of elements on the page. Ideally I'd like to refactor the "reattach events" routine to a single function rather than a routine for all. The only way I can think of to do this right now is to explicitly unbind, for

问题 I was trying to port over a ASP.Net ajax behavior into a jQuery plugin. A piece of puzzle that remains solving is to find a substitute for Function.createDelegate in jQuery. I need something like this in jQuery: this.$delegateOnClick = Function.createDelegate(this, this.fireOnClick); Is jQuery .delegate method the way to go? Or is it this post: Controlling the value of 'this' in a jQuery event 回答1: I think you want the jQuery $.proxy() function. There are two forms: var proxy = $.proxy

问题 How can I trigger the jQuery change event every time even when user selects the same value? I need a refresh effect e.g if a user select Lawyer and it alert hello then again user select Lawyer from the dropdown and it should alert hello . How can I achieve it? Following is the code. jQuery function filterPullDown () { alert('hello'); } $(".businessTypePullDown").change(filterPullDown); HTML <select class="businessTypePullDown"> <option value="" disabled selected>Business Type</option> <option

问题 In web application , How secure is local storage in Html5 or else is there any other way to secure the sensitive data in local storage. Project Structure: Front End: Html5,Angular js, Middletier: Asp.net webApi , BackEnd :Sql Server. Once user login into the page, that credentials is encrypted by using some cryptography algorithms.It will be stored in db. After that every child action like products list, order details, book history ,add product need to validate that. While refresh after the

问题 This is my code : function mark() { alert("This is a test box.."); } setTimeout("mark()",5000); Error : Function mark() is not found !! There is some other issue.. as it works on http://jsfiddle.net/russcam/6EXa9/ but its not working in my application.. so can you help me debug this ? What else can be the reason.. By the way I am running this inside a GreaseMonkey script ! 回答1: If you are using GreaseMonkey, any functions you define are sandboxed by GM and not available in the main window.

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . How can I replicate this PHP code into Javascript ?? It takes a number like 2-9999 (serial number) and converts it into a NUMBER ... 2-999 would be a

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . This is my input form: <input type="text" id="word" /> I basically want a Javascript function to execute when the person presses enter in the text box. I'm sorry if this is an obvious question, I couldn't find an

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . Jquery: $("#div td").live("click", function(){ alert("Hellow"); }); Javascript: function alertH(){ alert("Hellow"); } HTML Jquery: <div> <td> <a>X</a> <span> HI! </span> </td> </div> Click on td and runs the jQuery function, but only if you click on td and not other tags inside, as in jquery? HTML

问题 I have following code. window.onkeypress = function(event) { if (event.charCode === 115 && event.ctrlKey) { event.preventDefault(); // your code here.... alert("'Save As' dialog suppressed!"); } }; That code works on Firefox, but in Chrome it doesn't work. Can you help me? 回答1: You can't. Browsers don't expose (with good reason) the functionality to do this. Don't annoy your users. 来源： https://stackoverflow.com/questions/28710702/how-to-disable-save-as-dialog-in-chrome