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Handling events of child controls inside a DataGrid

Introduction

One of the big DataGrid mysteries is (or was, at least for me) the handling of events triggered by controls from within a DataGrid cell and not dealt with by the DataGrid itself. An example is handling of the OnCheckedChanged event of a CheckBox control with enabled AutoPostBack.

Background

If you, like me, found that using a DataGrid is one of the most convenient ways to handle any data-driven web application, you might quite often have experienced its limitations. If you need to get things done quickly, you might not want to write an entire column control yourself, but just use a TemplateColumn. Within this TemplateColumn, you would probably want to use some web controls and of course take advantage of all their native features, including events. But this doesn't work out quite as smoothly as it might sound. In the course of experimenting with controls inside a DataGrid, I experienced quite a lot of odd runtime compiler errors till I ran across one of the most interesting and useful DataGrid events: the ItemCreated event.

How-To

What we want to do here is just hook a handler routine onto the OnCheckedChanged event of the CheckBox control. The TemplateColumn with the CheckBox might look like the following

example:

<asp:TemplateColumn HeaderText="Checkbox">

    <ItemTemplate>

            <asp:CheckBox ID="cbExample" AutoPostBack="true" runat="server">

            </asp:CheckBox>

    </ItemTemplate>

</asp:TemplateColumn>

The function for handling the event in the underlying code will look very similar

to this:

    protected void OnChangeHandler(object sender, System.EventArgs e)

    {

        // Handle the event...

    }

(In this thread, you might find some example code for the handler.)

So, where are we going to connect the handler and the control? If we put the registration directly inside the control, such as OnCheckChanged="OnChangeHandler", while using code behind to support it, we will probably end up with a nice runtime compiler error. By applying the idea of delegate registration from Visual Studio, we can just do it at runtime. Using the ItemCreated event of the DataGrid (see code below) works out best for me, especially because I usually do a lot of other tweaking around like merging footer cells and switching sorting symbols.

    private void grid_ItemCreated( object sender,

           System.Web.UI.WebControls.DataGridItemEventArgs e)

    {

        ListItemType elemType = e.Item.ItemType;

        if ((elemType == ListItemType.Item)||

           (elemType == ListItemType.AlternatingItem))

        {

            // *** Event Handler for Checkbox ***

            CheckBox cBox = (CheckBox) e.Item.FindControl("cbExample");

            cBox.CheckedChanged += new EventHandler(OnChangeHandler);

        }

    }

Points of Interest

Handling DataGrid and related events is sometimes a cumbersome task, but the DataGrid is still one of my favorite controls. I would be happy to hear your solutions to this kind of problems. Particular points of interest: whether you simply placed a function call inside another DataGrid event, and why you preferred this solution in your particular situation.

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