Enabling And Disabling Buttons In GridView

Question

I have added a button column to a gridview. I am populating the gridview with a datable through code then binding the datable to the grid.

I need to now look at the first column of the data and check if the text of the column is "NA" if it is the button in that column has to be disabled.....

How can I accomplish this? I am populating the data from code and the button is preadded to the grid in the markup

<asp:GridView ID="GridView1" runat="server" OnRowCommand="GridView1_RowCommand">
    <Columns>
        <asp:ButtonField Text="Delete" />
    </Columns>
</asp:GridView>


GridView1.DataSource = dt;
GridView1.DataBind();

Kelsey · Accepted Answer · 2013-06-07 20:58:00Z

5

The best thing to do is implement the OnDataBinding method for a Button in a TemplateColumn.

Eg:

<asp:GridView ID="GridView1" runat="server" OnRowCommand="GridView1_RowCommand">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:Button runat="server" ID="btnDelete" CommandName="Delete" 
                    Text="Delete" OnDataBinding="btnDelete_DataBinding" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Then in your codebehind implement your logic:

protected void btnDelete_DataBinding(object sender, System.EventArgs e)
{
    Button btn = (Button)(sender);
    btn.Enabled = !Eval("TheFieldInYourDataSourceToCompare").ToString().Equals("NA");
}

The advantage to doing it in this manner over the other posted answers:

No code in your markup
Code is localized to the Button control and can be reused if other Buttons require the same functionality.
Comparing to the DataSource value and not what the visual output is (this could tie into business logic for both rendering and checking).

Hope that helps.

edited Jun 7, 2013 at 20:58

answered Jul 26, 2011 at 18:59

Kelsey

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3 Comments

Al Lelopath Over a year ago

Just a note the the above C# has a syntax error ...missing () after toString

Kelsey Over a year ago

@mickey Thanks. Old post but I fixed it :) Hope it was helpful.

Al Lelopath Over a year ago

I tried to implement as Kelsey suggests, but I have a DataGrid instead of a GridView. I get this run-time error: Parser Error Message: System.Web.UI.WebControls.DataGridColumnCollection must have items of type 'System.Web.UI.WebControls.DataGridColumn'. 'asp:TemplateField' is of type 'System.Web.UI.WebControls.TemplateField'., so I think I must use <asp:TemplateColumn> instead

Tim · Accepted Answer · 2011-07-26 18:40:33Z

1

Try this in the DataBound event handler:

protected void GridView1_DataBound(object sender, EventArgs e)
{

    for (int i = 0; i < GridView1.Rows.Count; i++)
    {

        if (GridView1.Rows[i].Cells[1].Text == "NA")
        {
          // Disable the button
        }
    }
}

This is just a general idea. You'll have to modify the code for your application.

Don't forget to add OnDataBound="GridView1_DataBound" to the markup for the GridView.

answered Jul 26, 2011 at 18:40

Tim

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Comments

abney317 · Accepted Answer · 2011-07-26 19:10:49Z

1

Maybe something like this. Did the button a little differently

<asp:GridView ID="GridView1" runat="server" OnRowCommand="GridView1_RowCommand">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:Button runat="server" ID="Btn_Delete" CommandName="Delete" Text="delete" 
                    Enabled='<%# GridView1.Rows[0].Cells[1].Text != "NA" %>' />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

You'll want to you Eval("someColumn") most likely instead of GridView1.Rows[0].Cells[1].Text

edited Jul 26, 2011 at 19:10

answered Jul 26, 2011 at 18:46

abney317

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3 Comments

Tim Over a year ago

Good alternative. One thing to point out though - you've hardcoded Rows[0]. You'll probably want to base the enable/disable on the corresponding row, not the first row every time :)

abney317 Over a year ago

Yeah, definitely. I did that since Nick didn't provide us with the full code.

abney317 Over a year ago

So Eval("DatabaseColumn") would probably work depending on the situation I guess

Rob Allen · Accepted Answer · 2011-07-26 18:38:32Z

0

Perhaps you can use OnRowDataBound="GridViewRowEventHandler" to set the value to enabled or disabled?

answered Jul 26, 2011 at 18:38

Rob Allen

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Comments

0cool · Accepted Answer · 2012-09-14 10:05:03Z

you can try from markup as,

 <asp:TemplateField HeaderText="QA signature">
                                     <EditItemTemplate>
                                         <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("Column6") %>'></asp:TextBox>
                                     </EditItemTemplate>
                                     <ItemTemplate>
                                         <asp:Label ID="Label3" runat="server" Text='<%# Eval("Column6") %>' Visible='<%# Eval("Column6") != "" %>'  ></asp:Label>
                                         <asp:Button ID="Button2" runat="server" Text="Sign Off" CssClass="cmdButton" Visible='<%# Eval("Column6") == "" %>'  />
                                     </ItemTemplate>
                                 </asp:TemplateField>

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