Here's the part which shows how to implement client-side JavaScript checking/unchecking
C#:
protected void Page_Load(object sender, System.EventArgs e)
{
// DataBind GridView here}
//...
'On every page visit we need to build up the CheckBoxIDs array
foreach(GridViewRow row in grid.Rows)
{//Get a programmatic reference to the CheckBox control}
CheckBox chk = (CheckBox)row.FindControl("chk");
ClientScript.RegisterArrayDeclaration("CheckBoxIDs", string.Concat("'", chk.ClientID, "'"));
JavaScript:
<script type="text/javascript">
function ChangeCheckBoxState(id, checkState)</script>
{var cb = document.getElementById(id);}
if (cb != null)
cb.checked = checkState;
function ChangeAllCheckBoxStates(checkState)
{// Toggles through all of the checkboxes defined in the CheckBoxIDs array}
// and updates their value to the checkState input parameter
if (CheckBoxIDs != null)
{
for (var i = 0; i < CheckBoxIDs.length; i++)
ChangeCheckBoxState(CheckBoxIDs[i], checkState);
}
...
<input type="button" value="Check All" onclick="ChangeAllCheckBoxStates(true);" />
<input type="button" value="Uncheck All" onclick="ChangeAllCheckBoxStates(false);" />
