event-handling

How to real time display input value with jQuery?

谁都会走 提交于 2019-11-30 03:52:12
<input type="text" id="name" /> <span id="display"></span> So that when user enter something inside "#name",will show it in "#display" You could simply set input value to the inner text or html of the #display element, on the keyup event: $('#name').keyup(function () { $('#display').text($(this).val()); }); A realtime fancy solution for jquery >= 1.9 $("#input-id").on("change keyup paste", function(){ dosomething(); }) if you also want to detect "click" event, just: $("#input-id").on("change keyup paste click", function(){ dosomething(); }) if your jquery <=1.4, just use "live" instead of "on"

When is Node.js blocking?

我的梦境 提交于 2019-11-30 03:42:36
问题 I have used Node.js for a while now and I just realized it can be blocking. I just cannot wrap my brain around the conditions under which Node.js becomes blocking. So, Node.js is single-threaded because (i) Javascript is and (ii) avoids all the multi-threaded pitfalls. To do a lot of things at once, despite being single-threaded, it implements asynchronous execution. So, talking with the DB (the I/O in general) is non-blocking (because it is asynchronous). But, all the incoming requests to do

Event handler for editing a Google Maps Polyline?

六眼飞鱼酱① 提交于 2019-11-30 03:37:13
I'm looking for an event that fires while you are editing a Polyline in Google Maps, similar to the 'drag' event on Markers. I've found the 'capturing_changed' event, but it seems to fire on dragstart and dragend, not on drag. As is I'm having to reinvent the wheel by allowing a Marker to be dragged and updating the Polyline based on where the Marker is, basically reinventing editable Polylines. I'd like to be able to add Markers, which editable Polylines do smoothly, but I have to be able to detect on drag. I can't find anything in the API documentation or on a Google search, so I thought I'd

JQuery Datepicker, can't trigger onSelect event manually!

不打扰是莪最后的温柔 提交于 2019-11-30 03:12:21
问题 I am using jquery's datepicker where a list of items is populated from an ajax call whenever a date is picked from an inline datepicker object. The script works perfect except that I can't trigger an onSelect event to populate my initial list of items. I could get around this problem by just populating the list initially using php but I would really like to avoid this. $(document).ready(function(){ //create date pickers $("#date_calendar").datepicker( { changeMonth: true, changeYear: true,

Help understanding .NET delegates, events, and eventhandlers [duplicate]

别说谁变了你拦得住时间么 提交于 2019-11-30 02:07:49
This question already has an answer here: Why does trying to understand delegates feel like trying to understand the nature of the universe? 6 answers In the last couple of days I asked a couple of questions about delegates HERE and HERE . I confess...I don't really understand delegates. And I REALLY REALLY REALLY want to understand and master them. (I can define them--type safe function pointers--but since I have little experience with C type languages it is not really helpful.) Can anyone recommend some online resource(s) that will explain delegates in a way that presumes nothing? This is

Avoid duplicate event subscriptions in C#

心不动则不痛 提交于 2019-11-30 01:50:21
How would you suggest the best way of avoiding duplicate event subscriptions? if this line of code executes in two places, the event will get ran twice. I'm trying to avoid 3rd party events from subscribing twice. theOBject.TheEvent += RunMyCode; In my delegate setter, I can effectively run this ... theOBject.TheEvent -= RunMyCode; theOBject.TheEvent += RunMyCode; but is that the best way? Jose Basilio I think, the most efficient way, is to make your event a property and add concurrency locks to it as in this Example : private EventHandler _theEvent; private object _eventLock = new object();

C#: calling a button event handler method without actually clicking the button

我的梦境 提交于 2019-11-30 01:48:18
I have a button in my aspx file called btnTest. The .cs file has a function which is called when the button is clicked. btnTest_Click(object sender, EventArgs e) How can I call this function from within my code (i.e. without actually clicking the button)? btnTest_Click(null, null); Provided that the method isn't using either of these parameters (it's very common not to.) To be honest though this is icky. If you have code that needs to be called you should follow the following convention: protected void btnTest_Click(object sender, EventArgs e) { SomeSub(); } protected void

jQuery Autocomplete verify selected value

不羁的心 提交于 2019-11-30 01:42:54
We are using the autocomplete jQuery plugin written by Jörn Zaefferer , and are trying to verify a valid option is entered. The plugin has result() event which fires when a selection is made. This is OK, but I need to check the value in the textbox when a user clicks out too. So we have tried a .change() and .blur() events, but they both pose an issue: when you click on an entry in the results div (the 'suggest' list) the .change() and .blur() events fire, and this is before the plugin has written a value to the textbox, so there is nothing to verify at this point. Could someone help me

C# Know how many EventHandlers are set?

ぃ、小莉子 提交于 2019-11-30 01:35:23
问题 As we all know, we can create an EventHandler and add methods to it N number of times. Like: // Declare and EventHandler public event EventHandler InternetConnectionAvailableEvent; private void OnInternetConnectionAvailableEvent() { if (InternetConnectionAvailableEvent != null) { EventHandler handle = InternetConnectionAvailableEvent; EventArgs e = EventArgs.Empty; handle(this, e); } } // IN OTHER CLASS WHERE I USE THE EVENT // Set the method name to handle the event monitorInternet

Changing UIButton text

余生颓废 提交于 2019-11-30 01:05:37
So I'm trying to update the text on a UIButton when I click it. I'm using the following line to change the text: calibrationButton.titleLabel.text = @"Calibration"; I have verified that the text is changing, but when I run the app and I click on the button, it changes to "Calibration" for a split second and then goes right back to its default value. Any ideas why this might be happening? Is there some sort of refresh function I need to be calling? Jesse Gumpo When laying out its subviews, a UIButton will set its titleLabel's text value using its own title values, so that you can set up to four