Dynamic button click event handler

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I've 100 buttons created dynamically in a form. How can I an add event handler to them?

You can use AddHandler to add a handler for any event.

For example, this might be:

AddHandler theButton.Click, AddressOf Me.theButton_Click

Button button = new Button(); button.Click += (s,e) => { your code; }; //button.Click += new EventHandler(button_Click); container.Controls. jQuery Dynamic Click Event: Bind click event on dynamically added element HTML tags. Here this article explains how to add click event for dynamic added element. In jQuery for click event we can simply use .click() method which works fine, but when you add dynamic HTML and try to achieve click event for it, then there you face problem .i.e .click() is not working.

Just to round out Reed's answer, you can either get the Button objects from the Form or other container and add the handler, or you could create the Button objects programmatically. If you get the Button objects from the Form or other container, then you can iterate over the Controls collection of the Form or other container control, such as Panel or FlowLayoutPanel and so on. You can then just add the click handler with AddHandler ctrl.Click, AddressOf Me.Button_Click (variables as in the code below), but I prefer to check the type of the Control and cast to a Button so as I'm not adding click handlers for any other controls in the container (such as Labels). Remember that you can add handlers for any event of the Button at this point using AddHandler. Alternatively, you can create the Button objects programmatically, as in the second block of code below. Then, of course, you have to write the handler method, as in the third code block below.

Here is an example using Form as the container, but you're probably better off using a Panel or some other container control.

Dim btn as Button = Nothing
For Each ctrl As Control in myForm.Controls
    If TypeOf ctrl Is Button Then
        btn = DirectCast(ctrl, Button)
        AddHandler btn.Click, AddressOf Me.Button_Click   ' From answer by Reed.
    End If
 Next

Alternatively creating the Buttons programmatically, this time adding to a Panel container.

Dim Panel1 As new Panel()
For i As Integer = 1 to 100
    btn = New Button()
    ' Set Button properties or call a method to do so.
    Panel1.Controls.Add(btn)  ' Add Button to the container.
    AddHandler btn.Click, AddressOf Me.Button_Click   ' Again from the answer by Reed.
Next

Then your handler will look something like this

Private Sub Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
    ' Handle your Button clicks here
End Sub

This video explains how to create click event for dynamically created button's in c#, This Duration: 3:23 Posted: 26 Aug 2017 I have here a small problem with a dynamically generated buttons and their event handler in asp.net. I generate a flexible table with additional Buttons for special users. The buttons will generate dynamically, which works fine. But I can’t get the event handler to work. Here are some pieces from my code: Build the button (In an own function).

@Debasish Sahu, your answer is an answer to another question, namely: how to know which button (or any other control) was clicked when there is a common handler for a couple of controls? So I'm giving an answer to this question how I usually do it, almost the same as yours, but note that also works without type conversion when it handles the same type of Controls:

Private Sub btn_done_clicked(ByVal sender As System.Object, ByVal e As System.EventArgs)
    Dim selectedBtn As Button = sender
    MsgBox("you have clicked button " & selectedBtn.Name)
End Sub

I have taken a panel in asp and then with the click of a button i have created some dynamic buttons.I have tried the Click+= event handler too  Just to round out Reed's answer, you can either get the Button objects from the Form or other container and add the handler, or you could create the Button objects programmatically. If you get the Button objects from the Form or other container, then you can iterate over the Controls collection of the Form or other container control, such as Panel or FlowLayoutPanel and so on.

I needed a common event handler in which I can show from which button it is called without using switch case... and done like this..

  Private Sub btn_done_clicked(ByVal sender As System.Object, ByVal e As System.EventArgs)

    MsgBox.Show("you have clicked button " & CType(CType(sender,  _
    System.Windows.Forms.Button).Tag, String))

  End Sub

Step 1: Creating dynamic buttons. Step 1: Creating dynamic buttons. ->Create new Project. ->Create Form as shown below. ->Write down the following code to create dynamic button. ->On click of load Button the output will be as follows : Video tutorial : Step 2 : Add Click Event to dynamically created buttons. Just create a button element with jQuery, and add the event handler when you create it : Question 1: Use .delegate on the div to bind a click handler to the button. Question 2: Use $ (this).val () or this.value (the latter would be faster) inside of the click handler. this will refer to the button.

Some code for a variation on this problem. Using the above code got me my click events as needed, but I was then stuck trying to work out which button had been clicked. My scenario is I have a dynamic amount of tab pages. On each tab page are (all dynamically created) 2 charts, 2 DGVs and a pair of radio buttons. Each control has a unique name relative to the tab, but there could be 20 radio buttons with the same name if I had 20 tab pages. The radio buttons switch between which of the 2 graphs and DGVs you get to see. Here is the code for when one of the radio buttons gets checked (There's a nearly identical block that swaps the charts and DGVs back):

   Private Sub radioFit_Components_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)

    If sender.name = "radioFit_Components" And sender.visible Then
        If sender.checked Then
            For Each ctrl As Control In TabControl1.SelectedTab.Controls
                Select Case ctrl.Name
                    Case "embChartSSE_Components"
                        ctrl.BringToFront()
                    Case "embChartSSE_Fit_Curve"
                        ctrl.SendToBack()
                    Case "dgvFit_Components"
                        ctrl.BringToFront()
                End Select
            Next

        End If
    End If

End Sub

This code will fire for any of the tab pages and swap the charts and DGVs over on any of the tab pages. The sender.visible check is to stop the code firing when the form is being created.

The dynamic Button, LinkButton and ImageButton are assigned dynamic Click event handlers and inside each dynamic Click event handler, a JavaScript Alert  A code-behind file implements an event handler method and then adds that method as a new event handler on the Button. The C# example uses the += operator to assign a handler to an event. This is the same operator that is used to assign a handler in the common language runtime (CLR) event handling model.

EventHandler(btnSubmit_click);} // Dynamic button click event protected void btnSubmit_click(object sender, EventArgs e) {// do what you need} jQuery . NET lets  Attaching event handlers to dynamically created JavaScript elements When working with JavaScript, you can sometimes need to create new elements on-the-fly, and from that, you’ll need to do something with that new element. It might be a click, which more often than not will need to execute a function.

How to bind click event to dynamically created HTML elements in jQuery <p>​Click the above button to dynamically add new list items. You can remove it later. This signature does not accept any arguments. This method is a shortcut for.on("click", handler) in the first two variations, and.trigger("click") in the third. The click event is sent to an element when the mouse pointer is over the element, and the mouse button is pressed and released. Any HTML element can receive this event.

Description: Attach an event handler function for one or more events to the selected elements. Example 1: Click event for dynamically added li 

Comments
  • Possible duplicate of How do I create an event handler for a programmatically created object in VB.NET?.
  • Don't forget to use RemoveHandler theButton.Click, AddressOf Me.Button_Click if you dispose of buttons programatically.
  • It might be more clear if you use AddHandler theButton.Click, AddressOf Me.theButton_Click as that would follow the default naming convention. Or you could call it Me.HandlerOf_thButton_Click.
  • Then you also need to assign Tag to every button. You could have just got a Name instead. The benefit is that Name uniquely identifies a control, whereas Tag values can be repeated.