学步园

全选按钮在在form中放个html的checkbox控件
<input id="CheckboxSelectAll" title="全选" type="checkbox"  onclick="SelectAll()" />全选

function SelectAll()
{
        var grid = document.getElementById("GridView1");
        if(grid == null)
        {
            alert("还没有任何记录");
            return;

            var checkBoxs = grid.getElementsByTagName('INPUT');
            for(var i=0;i<checkBoxs.length;i++)
            {
                if(checkBoxs[i].type=='checkbox')
                {
                    checkBoxs[i].checked = true;
                }
            }
      }
}