Add the checkbox column to the DataGrid using JavaScript (select all or not)

(1). Functions

1. Retrieve the checkbox in JavaScript and enable full selection and elimination.

The checkbox written in C # must be sent back to the server for execution,
Javascript can be implemented directly on the client, which is more efficient.

(2). Code

1. Main code snippets in the DataGrid:

<Columns>

<Headertemplate> // header template code
<Asp: checkbox id = "chkheader" runat = "server" autopostback = "false" // set autopostback to false without sending back

Onclick = "javascript: selectall (this);"> </ASP: checkbox>
</Headertemplate>

<Itemtemplate> // item template code
<Asp: checkbox id = "chkitem" runat = "server"> </ASP: checkbox>
</Itemtemplate>

</Columns>

2. Add:

<Script language = "JavaScript">
Function selectall (tempcontrol)
{
// Retrieve all other checkboxes except the header Template

VaR thebox = tempcontrol;
Xstate = thebox. checked;

ELEM = thebox. Form. elements;
For (I = 0; I <ELEM. length; I ++)
If (ELEM [I]. type = "checkbox" & ELEM [I]. ID! = Thebox. ID)
{
If (ELEM [I]. Checked! = Xstate)
ELEM [I]. Click ();
}
}
</SCRIPT>

3. When the user selects the background code to obtain the checkbox value of a column:
For (INT I = 0; I <this. DataGrid. Items. Count; I ++)
{
Bool blnifselect = (checkbox) This. DataGrid. items [I]. findcontrol ("chkitem"). checked;
...; // You can perform various operations based on blnifselect.
}