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GridView DropDownList events

 
 
dev648237923
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      02-22-2007
When editing I show a DropDownList.
I want to show/hide a textbox next to that list if the user selects Other.

I've tried many ways but I can get it to work:
1.) If I knew the TextBox controls name/id I could just add an onchange
attribute to my DDL during RowDataBound and then put in some javascript to
show/hide the textbox but I never know in advance the name/id of the textbox
since it changes depending on what row I am on.
2.) I could set the DDL to AutoPostBack but then how would I affect the
textBox in that row?

Thanks for any ideas!


 
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Steven Cheng[MSFT]
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      02-23-2007
Hello dev648237923,

Regarding on the dropdownlist and textbox interact requirement, I think you
can use the GridView.RowCreated event to set script handler for the
DropDownList( the "onchange" client event). And at that time, you can get
the Textbox instance also and embed its "ClientID"(which represent its id
at client-side html) into your script function call. For example, suppose
you have a TemplateField in gridview as below:

==============================
.......................
<asp:TemplateField HeaderText="template column">
<ItemTemplate >
<aspropDownList ID="lstTest" runat="server" >
<asp:ListItem Text="aaa" Value="aaa"></asp:ListItem>
<asp:ListItem Text="bbb" Value="bbb"></asp:ListItem>
<asp:ListItem Text="ccc" Value="ccc"></asp:ListItem>
</aspropDownList>
<asp:TextBox ID="txtTest" runat="server">
</asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

=======================

In GridView's RowCreated event, you can find the DropDownList and Textbox
and do some customization on them:

=======================
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow &&
e.Row.RowState == DataControlRowState.Normal)
{
DropDownList lst = e.Row.FindControl("lstTest") as
DropDownList;
TextBox txt = e.Row.FindControl("txtTest") as TextBox;

lst.Attributes["onchange"] =
"javascript:AdjustTextBox(this, '" + txt.ClientID + "');";

}
}
==================

Here is the client script functino
=============
<script type="text/javascript">

function AdjustTextBox(lst, txtid)
{
var txt = document.getElementById(txtid);

txt.value = lst.selectedIndex;
}
</script>

================

You can adjust the test code to fit your specific requirement. If you have
any further questions on this, please feel free to let me know.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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