Currently, I am working on an ASP.NET application using C#. One of the features in my project involves a Grid View with a Listbox control. The Listbox is initially set to be disabled by default. My goal is to enable and disable this control dynamically based on the Checkbox state using JavaScript or jQuery.
This is a snippet of my ASP code:
<asp:GridView ID="gvWhom" runat="server" AutoGenerateColumns="False" DataSourceID="odsWhom"
GridLines="None" Width="100%" OnRowDataBound="gvWhom_RowDataBound">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
</HeaderTemplate>
<ItemTemplate>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr style="height: 25px;">
<td width="20%">
<asp:CheckBox ID="chkCriteria" runat="server" Text='<%#Eval("TargetType") %>' />
</td>
<td width="80%">
<asp:ListBox ID="lbCriteria" runat="server" CssClass="ddl" Width="150px" Height="50px"
Enabled="false" SelectionMode="Multiple"></asp:ListBox>
</td>
</table>
</ItemTemplate>
<HeaderStyle Height="2px" />
</asp:TemplateField>
</Columns>
</asp:GridView>
This is the JavaScript function used for enabling/disabling the ListBox:
function disableDropDown(chkCriteria, lbCriteria) {
if (document.getElementById(chkCriteria).checked) {
document.getElementById(lbCriteria).removeAttribute('disabled');
}else{
document.getElementById(lbCriteria).value = -1;
document.getElementById(lbCriteria).disabled = true;
}
return true;
}
And here's how it is implemented in the C# code:
protected void gvWhom_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
ListBox lbCriteria = (ListBox)e.Row.FindControl("lbCriteria");
CheckBox chkCriteria = (CheckBox)e.Row.FindControl("chkCriteria");
chkCriteria.Attributes.Add("onchange", "javascript:return disableDropDown('" + chkCriteria.ClientID + "', '" + lbCriteria.ClientID + "')");
}
}
Although the current setup allows me to enable/disable the Listbox control successfully, I'm facing difficulties in retrieving the selected items when multiple options are chosen and the form is submitted. Could you provide guidance on how to retrieve the selected items from the Listbox? Alternatively, is there a better approach to handle enabling/disabling of the Listbox control while still being able to access its selected items in the C# code?