C# - Button Event Handlers Do Not Fire On The First Click But On The Second Click After A PostBack
May 4, 2010
Background: I am customizing an existing ASP .NET / C# application. It has it's own little "framework" and conventions for developers to follow when extending/customizing its functionality. I am currently extending some of it's administrative functionality, to which the framework provides a contract to enforce implementation of the GetAdministrationInterface() method, which returns System.Web.UI.Control. This method is called during the Page_Load() method of the page hosting the GUI interface.
Problem: I have three buttons in my GUI, each of which have been assigned an Event Handler. My administration GUI loads up perfectly fine, but clicking any of the buttons doesn't do what I expect them to do. However, when I click them a second time, the buttons work.
I placed breakpoints at the beginning of each event handler method and stepped through my code. On the first click, none of the event handlers were triggered. On the second click, they fired.
Example of Button Definition (within GetAdministrationInterface)
On my page: a Button1, a ListView1, a Panel1 and inside Panel1 an ImageButton1In the ListView1_PreRender-Event the property Panel1.Visible = false or Panel1.Visible = true is set.1. After first loading of the Page Panel.Visible = false ist set in ListView1_PreRender.2. After the postback click on Button1 the criteria for the visibility of Panel1 are evaluated, thus setting in the ListView_PreRender Panel.Visible = true.
I have a Web Form that contains a Web Control. This control has several buttons on it and one in particular requires that I click it twice before the Click Event fires. The settings are all the same for the buttons but just not sure what to look for.
I am adding some dynamic image buttons to a form in my code behind (vb.net) and added a click event handler, but it never fires. Also when I click on a button the page posts back and everything below my update panel disappears.
I have a form with several submit buttons. I would like the button's click events to fire when enter is pressed based on which textboxes currently have focus. I am able to specify one button using the code below by adding the onkeydown event to the body of the page and checking for Enter's keyCode
I have a webpage in which I an dynamically creating a button control for a shopping cart. The cart is made using HTMLTable. In the same procedure that builds the table, I create my button call "btnAddToCart". I have also added a "WithEvents" for this button in the page;
Here is the code pertaining to all references of the "btnAddToCart".
Code: WithEvents btnAddToCart as Button
Private Sub BuildCart() . . [Code]...
I'm actually loading a productID into the "ToolTip" property of the button. In the click event of the btnAddToCart, the code is not being executed when I set a breakpoint.
I am creating nested accordion using the object model and have created buttons in the inner accordion's accordion pane. The buttons look great but issue is that the buttons does not fire thier click event. They just do the postback of the page and ignore the event.
I want to show a pop-upextender on the pre_init event but all my panes are added dynamically so it does not give any rows.
I have a modal formview with insertitemtemplate. I have to click the insert button twice to fire the event.
But if I do not insert any values, only one click is required and the validationgroup fires. But if I enter all valid values, I need to click twice and the event does not fire during the first click. But I need CausesValidation = false because to required field validators.
How to avoid two clicks to fire the event if the formview is valid
I dont know what happened but none of my buttons or linkbuttons causes a postback anymore. I have dragged a few updatepannels on the page but the linkbutton concerned is not enclosed within an update pannel. when I click it there is just no postback happening anymore. I set the debugger at Page_load but...its not reached. I used firebug to analyse the http requests. there is none. its like those are not considered buttons anymore.
I have created a user control which has a form and 2 buttons; Save and Submit. Both buttons are created at design time. Users can enter details in the form (e.g. title and description of an item) and click Save which does some server-side processing to create an 'Item' then clears the form.
And a placeholder to add dynamically created controls:
I am saving the Items in ViewState and dynamically creating a LinkButton control for each Item which allows the user to edit the item:
Now, when I test this in Visual Studio 2010, it works fine;
1. Enter Item title and description in form
2. Click Save
3. Save button triggers postback and onClick event code is run
4. ViewState list is displayed below the form
When I create a local IIS web site for testing, the postback on the Save button only works the first time I click it. Postback is false on the second click and the page reloads without running the onClick event code.