Following JS function get the checkbox element of RowChecker and invoke click() method to simulate click action

function ClickRowChecker()
{
    var grid = ISGetObject("WebGrid1");
    var colHeader = grid.RootTable.GetElement(WG40.COLHEADER, WG40.HTMLDIV);
    var colHeaderRow = colHeader.childNodes[0].childNodes[0].childNodes[0];
    var checkRowElm = colHeaderRow.childNodes[1].childNodes[0].childNodes[0].childNodes[0];
            
    checkRowElm.click();
}

To disable the checkbox element, simply set its disabled to true.

function DisableRowChecker()
{
    var grid = ISGetObject("WebGrid1");
    var colHeader = grid.RootTable.GetElement(WG40.COLHEADER, WG40.HTMLDIV);
    var colHeaderRow = colHeader.childNodes[0].childNodes[0].childNodes[0];
    var checkRowElm = colHeaderRow.childNodes[1].childNodes[0].childNodes[0].childNodes[0];
            
    checkRowElm.disabled = true;
}

Hope this helps.

Thanks

Glad to hear that the snippet code helps.

Should you need further assistance or run into any problems regarding our controls, feel free to post it into our forum. We would be happy to assist you again.