onchange

问题 So I have the following: var change_handler = function(element) { // ... do some fancy stuff ... } Now, I want to attach this to an element. Which is the better/best or more correct method? $('element_selector').change(change_handler(this)); Or... $('element_selector').change(function() { change_handler(this); }); And does it make any difference if you're passing the object to the function or not? 回答1: Neither.. $('element_selector').change(change_handler); change_handler will be the so to

问题 I have a form that contains a TextBox. A pop up window will return a value and put it into the TextBox. when this happens, I need to populate another control. I tried tried "onChange" but it was not triggered . How can this be achieved? 回答1: You can use onchange, but this usually won't wire until the box loses focus . There's also onkeyup, which you want to use if you want the new text immediately. Can you control the window populating the textbox? If so that's your best route, since it's the

问题 I have the following markup: <asp:DropDownList ID="dd1" AutoPostBack="true" runat="server"> <asp:ListItem Value="1">1</asp:ListItem> <asp:ListItem Value="2">2</asp:ListItem> </asp:DropDownList> <asp:DropDownList ID="dd2" AutoPostBack="true" onchange="javascript:return true;" runat="server"> <asp:ListItem Value="1">3</asp:ListItem> <asp:ListItem Value="2">4</asp:ListItem> </asp:DropDownList> Wired up to this: Protected Sub changed1(sender As Object, e As EventArgs) Handles dd1

问题 Is there a eventListener who is just checking the changes of an innerText? Example: 12345 I just want to check if "12345" is changing to something else like "23415". There is no "click" event that will comes up or anything else. I don't have the chance to go through the code where the updates from the span's are coming. So I really can just only grab the event from the changes in the span element but I don't have any clue how. Sorry for my bad English and thanks! 回答1: Check out the

问题 The Prototype event listener I use for changes in select menus is not being triggered in IE. Event.observe('use_billing', 'change', Checkout.getBillingData); This works fine in Firefox (of course), but nothing happens in IE (of course) - I've been Googling this for some time, but I have not found a suitable solution to this problem. I read there are problems, but I found nothing useful to circumvent the issue and get this to work. I am really trying to avoid using inline event triggers,

问题 How can I detect if the navigator changed your state to online/offline? something like: var oldState = navigator.onLine; window.navigator.onlinechange = function(evnt,newState) { alert('your changed from' + oldState + ' to' + newState + 'state'); } 回答1: Something like this (not every browser supports these events, currently only IE 8,9 and FF > 3 support these events): var el = document.body; if (el.addEventListener) { el.addEventListener("online", function () { alert("online");}, true); el

问题 I have an input text with an onchange event that calls a function in which an alert box displays. I also have a button whose onclick calls a different function. If the user makes a change in the input text and immediately clicks the button, the onchange event fires, displaying the alert box, but the code in the function for the onclick of the button doesn't execute. I've read that this has something to do with event bubbling, but I haven't seen any solutions. Is there a solution? Is it even

问题 I'm doing validation in AngularJS, and I have a div that is displayed if there are 3 types of errors. For required I want to show the error message only if the page is submitted with empty value <div class="error" data-ng-show="submitted && mainForm.email.$error.required" /> For the regex validation I want it to flag real-time, default behavior. <div class="error" data-ng-show="mainForm.email.$error.pattern" /> The problem I'm facing is with minlength. I don't want to show it while they are

问题 I want to create a form for making a reservation for borrowed items. A reservation consists of pick up time, return time and items the reserver wants to borrow and their amounts. For example, I might want to reserve three plates, three knives and three forks for the rest of the week. In the form, I want to do an AJAX validation that checks whether there is enough items available. Next to each item I have a text box with which the reserver inputs the item amount. After the input, I want to do

问题 I am using laravel 4..2 and have a html onchange function like the image. And showing me the error as the second image. This AJAX request does not work on create method but it works on index method of a laravel resource controller. Its happening may be because of laravel controller. Can anybody help me by explaining this. // Routes.php Route::resource('index', 'IndexController'); Route::get('ajax-subcat', function(){ $cat_id = Input::get('cat_id'); $subcategories = Subcategory::where('parent