How to send extra parameter on SelectedIndexChanged? - asp.net

Question

Is there any way to send extra parameter to SelectedIndexChanged function?
<asp:RadioButtonList
ID="rblMeetingPlace"
SelectedValue = '<%# Bind("intMtgLoc") %>'
*OnSelectedIndexChanged = "Validate('txtMeetPlaceOther')"*
runat="server"
RepeatDirection="Horizontal"
>
<asp:ListItem Value="1">Workshop</asp:ListItem>
<asp:ListItem Value="2">Service provider agency</asp:ListItem>
<asp:ListItem Value="3">Advocacy organization</asp:ListItem>
<asp:ListItem Value="4">Public Space</asp:ListItem>
<asp:ListItem Value="5">Other (specify): </asp:ListItem>
<asp:ListItem Value="" Text="" style="display: none" />
</asp:RadioButtonList>
<asp:TextBox ID="txtMeetPlaceOther" Text='<%# Bind("strMtgLocOth") %>'
runat="server" />
I have couple of radiobuttonlist and I want to enable the textboxes when "Other" is selected.
I am thinking of sending the textbox's id to enable it.
Any idea?

Answer 1

You can easily do it this way:
<asp:radiobuttonlist id="rbl1" runat="server"
RepeatDirection="Horizontal"
AutopostBack="true"
SelectedValue='<%# Bind("intMtgLoc") %>'
OnselectedIndexChanged="rbl1_SelectedIndexChanged">
<asp:ListItem Value="1">Workshop</asp:ListItem>
<asp:ListItem Value="2">Service provider agency</asp:ListItem>
<asp:ListItem Value="3">Advocacy organization</asp:ListItem>
<asp:ListItem Value="4">Public Space</asp:ListItem>
<asp:ListItem Value="5">Other (specify): </asp:ListItem>
<asp:ListItem Value="" Text="" style="display:none" />
</asp:radiobuttonlist>
<asp:textbox id="txtMeetPlaceOther" text='<%# Bind("strMtgLocOth") %>' runat="server" />
<asp:textbox id="TextBox1" enabled="false" runat="server"></asp:textbox>
<asp:textbox id="TextBox2" enabled="false" runat="server"></asp:textbox>
and in code-behind:
protected void rbl1_SelectedIndexChanged(object sender, EventArgs e)
{
*yourValidatorName*.Validate();
if (Convert.ToInt32(rbl1.SelectedValue) == 5)
{
TextBox1.Enabled = true;
TextBox2.Enabled = true;
}
else
{
TextBox1.Enabled = false;
TextBox2.Enabled = false;
}
}
reply to comment:
First of all you should set OnSelectedIndexChanged for all RadioButtonLists event handlers. Here - rbl_SelectedIndexChanged.
Then in code behind:
protected void rbl_SelectedIndexChanged(object sender, EventArgs e)
{
TextBox[] textboxes = new TextBox[] { TextBox1, TextBox2 };//all your textboxes.
RadioButtonList whoCallEvent = sender as RadioButtonList;
string last = whoCallEvent.ID.ToString().Substring(whoCallEvent.ID.ToString().Length - 1, 1);//get the last symbol of object (TextBox) ID, who call event.
int index = Convert.ToInt32(last);
if (Convert.ToInt32(whoCallEvent.SelectedValue) == 5)
{
textboxes[index - 1].Enabled = true;
}
else
{
textboxes[index - 1].Enabled = false;
}
}
But I think this is conceptually wrong to do it this way. The best way is to create rbl_SelectedIndexChanged for all the radioButtonList you have on my page.