event-handling

问题 I'm using global variable named "client" For example client.getPagesCompleted += (s, ee) => { pages = ee.Result; BuildPages(tvPages.Items, 0); wait.Close(); }; client.getPagesAsync(cat.MainCategoryID); I need to clear handlers for getPagesCompleted and set another handler. How to easy clear handles? I know client.getPagesCompleted-=new EventHandler(...) . But it is very difficult. I need easy way. I'm using client.getPagesCompleted=null but error shown. "only use += / -+" 回答1: The only way to

问题 I am using 2016 version and have a master ETL_Extract package where I am executing three Child packages(ABC,DEF,XYZ) using Execute Package Task. I would like to capture the System::Error_Description for any error occurs in any of these child packages and has to be notify as an email message through parent package. I am using OnError Event on Child package with below script to capture the "System::Error_Description" using script task on OnError event for Child as shown below: Using below

问题 I'm working on a Form that contains a datagridview and textbox, I need the datagridview detect any letter of the alphabet or numbers, then select the input and send the key pressed to input. I can not find any solution for this, thanks in advance. 回答1: You will need to attach an event handler to the cell editing control that is receiving the data that will respond to the KeyPress event. This can be done by handling the EditingControlShowing event. Here is some basic code that does this:

问题 Here is my code. You can copy-paste and follow what I write bellow to see the problem yourself. public class MyApp extends Application { @Override public void start(Stage stage) throws Exception { Scene scene = new Scene(new MyView(), 100, 150); stage.setScene(scene); stage.show(); } private class MyView extends BorderPane { MyView() { GridPane board = new GridPane(); int size = 3; for (int i = 0; i < size*size; i++) { BorderPane pane = new BorderPane(); pane.setMinSize(30, 30); pane

问题 I am using cell editing in jqgrid and for that, i am using many different jqgrid events, as mentioned below ... 1) beforeSelectRow, 2)beforeEditCell, 3)afterEditCell, 4)onCellSelect, 5)ondblClickRow, etc... Now, when i doubleClick on any of the row, the beforeselectRow code gets executed first.. which i want to prevent... but how to do that ?? Some example code is as below :- ondblClickRow: function(id,irow,icol,e) { ........ }, beforeSelectRow : function(rowid, e) { if(rowid==lastSelected) {

问题 I have the following code in one of my js files $('#elementID').hoverIntent({ over: function() {//function#1 body}, out: function() {// function#2 body} }); and in another one of my js files I want to add another method to hoverIntent. But the new binding overwrites the previous one and only the new one will execute. $('#elementID').hoverIntent({ over: function() {//function#3 body} }); so I want both function#1 and function#3 to be executed on hover. is that even possible with hoverIntent?

问题 There is a button btn_Edit in a window. When that button clicked, a new window opens ( new_win ) and a click event is added to a button ( btn_OK ) on new_win . It seems that btn_OK_Click does not work because new_win does not close. Where is the problem? BC_edit new_win = new BC_edit(); private void btn_Edit_Click(object sender, RoutedEventArgs e) { new_win.Title = "a_title"; new_win.ShowDialog(); new_win.btn_OK.Click += new RoutedEventHandler(btn_OK_Click); } private void btn_OK_Click(object

问题 I have a callback handler to handle a websocket event and I am trying to write a function which would return a promise. The promise should be resolved if the handler is called or rejected if the handler is not executed. Is there a better way to do this? var callbackCalled = false; var message = null; waitForMessage = function() { return new Promise(function(resolve, reject) { setTimeout(function() { if (callbackCalled) { callbackCalled = false; message = null; resolve(); } else { reject(); }

问题 I am having a bit of a problem when handling a HDN_ENDTRACKW message for a custom class which derives from CListCtrl . Essentially, it seem that when this message is sent, the actual value which stores the width of the column is not updated until after my handling code has been executed. The code inside the handle simply instructs a progress bar to resize, to fill the width of the resized column. The code: void ProgListCtrl::OnEndTrack(NMHDR* pNMHDR, LRESULT* pResult) { int width = ListView

问题 I've got a WPF usercontrol in a winforms application form. Basically, I want a generic eventhandler attached to my WPF TreeView to handle "Document.NodeChanged". As this particular event fires when the tree is populated, I attempted to do a late attachment, via my treeview control's Loaded event. The code goes something like: private void UpdateGrid() { myGridView.UpdateXML(entityId, runDate, rtbToggleFullView.ToggleState == Telerik.WinControls.Enumerations.ToggleState.Off, userName); /