Custom Control Event Handling Problem

Hi,

I'm novice and i would like to know that how can we handle the events like TextChanged event for the text box, OnClick Event for the button control, etc.

Please help me

Thanks in advance

Re: Custom Control Event Handling Problem

The short-cut.

Double click a button on your page and you will automatically go to the onclick event handle for that button. You can then write code to be excecuted when that button is clicked.

In general

If you right click a control, let it be a button, textbox or dropdownlist or radiobuttonlist and select properties, you see a yellow "thing", move the mouse over that yellow "thing" and you will see a tooltip saying 'events'. If you click it, you will see all events that can be handled for that control. So just double click in the column at the right of the event you want to handle and you will be right in its event handle and you can start writing your code there.

Re: Custom Control Event Handling Problem

hi,

I've done this but when double clicking the custom control button I'm not getting the text changed event even though I'm getting in the Properties event field

Re: Custom Control Event Handling Problem

Hi,

I guess what you are talking about is the user controls which can add server controls in the ascx page. You can assign the handle method attribute with the method name in the tag. The following one is a sample. For more information about usercontrol, plsase visit http://quickstarts.asp.net/QuickStartv20/aspnet/doc/ctrlref/userctrl/default.aspx

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />

    protected void Button1_Click(object sender, EventArgs e)
    {

    }

Thanks.

Re: Custom Control Event Handling Problem

Hi,

You mean to say that We can't do the event handling using the custom server control???

Re: Custom Control Event Handling Problem

If you are referring to a Custom Server Control and not a User Control, as I think you are, then perhaps this will help.

Say you have a Custom Server Control that is a composition of a ListBox and a Button on a Panel. Your custom server control class would probably look like this

public class MyCustomListBox : Panel, INamingContainer
{
    protected ListBox MyListBox;
    protected Button DeleteButton;

...

. In order to handle the events of the sub controls (ListBox and Button), you need to register Event Handlers for them.

To do this you basically need a method in your custom control of the right signature (object o, EventArgs e), then create a delegate and assign it to the correct event using event registering operator (+=).

e.g to capture the Click event of the button, you would create your handler method in the custom control (MyCustomListBox) class

protected void MyButton_Click(object sender, EventArgs e)
    {
       //do stuff to handle event here
    }

then register the handler on the button when you are adding the control to your panel in the CreateChildControls method you will be overriding.

e.g.

 protected override void CreateChildControls()
    {
        MyButton = new Button();   //create the button object
        MyButton.Text = "Delete item";  //modify any properties you want
        MyButton.Click += new EventHandler(this.AddRightButton_Click);  //Create a delegate for the handler function and add/register it on the Click event
        this.Controls.Add(MyButton); //Add the button to the this (ie. to the panel)
        //more child controls stuff
        //..
    }

When the control is added to a page and displayed the button will be displayed as part of the panel. When the user clicks on the button the Click event will fire and your MyButton_Click method will be called.

NB: The name of the button handler is not important, you could call it Fred, just so long as it has the correct signature e.g. protected void Fred(object o, EventArgs e)

Re: Custom Control Event Handling Problem

Hi,

I've sorted out the problem. Now, can anyone suggest me that how can i make radio and check box custom controls

Re: Custom Control Event Handling Problem

Ajeet,

I think it would be polite to first acknowledge some of the people who have already offered you advice on this topic - othwise, I suspect you will not be getting much more help in the future.

Re: Custom Control Event Handling Problem

Hi,

Sorry For my attitude. Actually before getting your suggestion, I've done the work. But after getting your suggestion, i realized so. I'm late to say thanx but still I want to say thanks.

Again Sorry

Re: Custom Control Event Handling Problem

Hi,

There a bit of problem in my button custom control who can act like hyperlink and simple button, When idouble click over it, the cursor goes no where in the .aspx.cs page. means to say the the wvent is not handled by the double click over the control. Although it is working fine by attaching it in the OnInit()method

protected override void OnInit(EventArgs e)

{

this.AKS_Button1.Click +=new EventHandler(AKS_Button1_Click);base.OnInit(e);

}

this code is working fine, but not the double click.

thanks in advance