event-handling

问题 I am having an ASP.Net Page which contains multiple controls which implement the IPostBackEventHandler interface. The SIMPLIFIED VERSION of the code is given below: public partial class WebForm1 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { //Custom Control MyTextBox mytxt = new MyTextBox(); mytxt.ID = "mytxt"; mytxt.TextChange += mytxt_TextChange; this.Form.Controls.Add(mytxt); //Custom Control MyButton mybtn = new MyButton(); mybtn.ID = "mybtn"; mybtn.Click +

问题 I must be missing something obvious - I am new to .NET - been developing in C++/MFC for years. In an event handler for a button click I would like to then re-use another event handler/click. However, I can't seem to figure out how to do that. The bit that may be causing trouble is that the handler for the second item I want to "fire" is not on the same form/context. It seems that I should just be able to call the method... But I don't seem to be able to do it. This is in compact framework/Win

问题 I have a sharepoint event handler which I want to activate for a single list, not all the lists in the site. How do I go about this? 回答1: Got the answer. We need to run this code, maybe in a console app. I still didn't get how to remove the event handler once it has been added though... string siteUrl = Console.ReadLine(); SPSite site = new SPSite(siteUrl); SPWeb web = site.OpenWeb(); string listName = Console.ReadLine(); SPList list = web.Lists[listName]; string assemblyName = "Issue

问题 what am doing is attaching event on a class using a loop and index values are being used in the event handler code. here is my code: var classElements=document.getElementsByClassName("a"); for(var i=0; i<4; i++) { classElements[i].onClick=function(){ alert("Clicked button : "+i); } } when ever I click any of the buttons, it alerts Clicked Button : 4 What could be the prob? 回答1: JavaScript closes over the object and evaluates it later when it is called. At the time it is called, i is 4. I

问题 In Delphi 2009 I have a Form with a procedure MyProcedure that writes to a label on the Form. The form uses a DataModule with a ClientDataSet. When the AfterScroll event of the ClientDataSet is fired MyProcedure should be executed. To avoid circular references and more important, as I want the DataModule to be reusable, the DataModule should not reference to this specific Form. In short, I hope that I can access the AfterScroll event from my Form. Can I hook up the Afterscroll event on the

问题 In C++ we can import msxml DLL to our application and then implement the methods of the interface ISAXContentHandler in a class of our application. Later create an ISAXReader object and invoke the contentHandler with the instance of this class where we have given the implemnatation for the eventhandler interfaces. Similiarly I want to achieve the same thing in C#. Is there any way to do this in C#?? I mean is there any way to have eventbased SAX parsing in C#. There is one more method I

问题 I have what seems to be a simple task yet I am not sure how and where to start. What I currently have is a series of subplots displayed on one figure. Now I want to add/connect an event handler on each subplot, such that when the user clicks on one of the subplots the plot that was selected would be opened in a separate figure/window. I want to know if this is possible and if someone could formulate a small simple code to illustrate how this can be done. I should also mention that the only

问题 Quick question about JavaScript event objects - how does JavaScript know when I'm trying to pass an event variable to a function? For example, when I define an onclick handler like so: <button onclick='SendMessage(event)'></button> does JavaScript pass the event variable just because I named it "event"? If so, what other variable names does it reserve for the purpose of passing event variables? (e? ev? etc..) If this is the case, can they be covered by naming local or global variables "event"

问题 After crashing my head against the monitor for 2 hours I realised that: display.blit(mypic, posx, posy) pygame.display.update() would just not work (i.e. wouldn't blit anything on the screen ) unless I call: pygame.event.get() Is this the weirdest bug on earth, or am I missing something? I'm running pygame on python 2.7, mac os high sierra, and yes I would be the least surprised if this was due to the goddam incompatibility between pygame and mac os. Any hint about what is going wrong here ?

问题 Another follow up to this and this. Actual question Question 1 Upon running into some condition (say a simpleError ), how can I invoke a respective restart handler that systematically tests a range of actual handler functions until one is found that does not result in another condition? If the last available handler has been tried, the default abortion restart handler should be invoked ( invokeRestart("abort") ). The implementation should allow for a flexible specification of the actual