Selecting multiple checkboxes inside a GridView control
Introduction
GridView is a new data bound control introduced by Microsoft in
Visual Studio .NET 2005. Most of the operations like sorting, paging and
selecting items from the GridView are already built in and you can
use it through the design view. In this article, I will explain how you can
select single as well as all the checkboxes which are inside a
GridView control.
Selecting Checkboxes inside the GridView Control
GridView has a CheckboxField column which maps the
checkbox to a field in the database. In this article we won't be using that, we
will make a checkbox in a template column. Simply add a
asp:checkbox control in the item template of the
GridView control. If you are working with a DataGrid
control and want the same functionality, then please check out my article: Selecting
multiple checkboxes inside a DataGrid control.
The HTML code looks something like this:
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="PersonID"
DataSourceID="mySource" Width="366px" CellPadding="4"
ForeColor="#333333" GridLines="None">
<Columns>
<asp:CommandField ShowSelectButton="True" />
<asp:BoundField DataField="PersonID" HeaderText="PersonID"
InsertVisible="False" ReadOnly="True" SortExpression="PersonID" />
<asp:BoundField DataField="Name" HeaderText="Name"
SortExpression="Name" />
<asp:TemplateField HeaderText="Select">
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" />
</ItemTemplate>
<HeaderTemplate>
</HeaderTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
<PagerStyle BackColor="#FFCC66" ForeColor="#333333"
HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
Now in the button click event, write this code:
// StringBuilder object
StringBuilder str = new StringBuilder();
// Select the checkboxes from the GridView control
for (int i = 0; i < GridView1.Rows.Count; i++)
{
GridViewRow row = GridView1.Rows[i];
bool isChecked = ((CheckBox) row.FindControl("chkSelect")).Checked;
if (isChecked)
{
// Column 2 is the name column
str.Append(GridView1.Rows[i].Cells[2].Text);
}
}
// prints out the result
Response.Write(str.ToString());
The code above just iterates through the GridView and selects
the checked checkboxes. Later it appends the selected value to a
StringBuilder object. In order to use StringBuilder
you will need to add the System.Text namespace.
Making a CheckAll functionality
To add a check-all functionality in the GridView, simply add a
HTML CheckBox to the header template of the checkbox column.
<HeaderTemplate>
<input id="chkAll" onclick="javascript:SelectAllCheckboxes(this);"
runat="server" type="checkbox" />
</HeaderTemplate>
SelectAllCheckboxes JavaScript method:
<script language="javascript">
function SelectAllCheckboxes(spanChk){
// Added as ASPX uses SPAN for checkbox
var oItem = spanChk.children;
var theBox= (spanChk.type=="checkbox") ?
spanChk : spanChk.children.item[0];
xState=theBox.checked;
elm=theBox.form.elements;
for(i=0;i<elm.length;i++)
if(elm[i].type=="checkbox" &&
elm[i].id!=theBox.id)
{
//elm[i].click();
if(elm[i].checked!=xState)
elm[i].click();
//elm[i].checked=xState;
}
}
</script>
This is it. I hope you like the article, happy coding!
