在gridview上实现上下键移动选中行！ .

因为要用到js，所以要在gridview的OnRowDataBound中加入js的语句。

        protected void gvMain_OnRowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                string strGvName = "gvMain";
                e.Row.Attributes.Add("id", strGvName + _i.ToString());
                e.Row.Attributes.Add("onKeyDown", "SelectRow(event,'" + strGvName + "');");
                e.Row.Attributes.Add("onClick", "MarkRow(" + _i.ToString() + ",'" + strGvName + "');");
                e.Row.Attributes.Add("tabindex", "0");
                _i++;
            }
        }

其中的_i要预先声明

private int _i = 0;

为什么要加入tabindex="0"这个属性呢，没有这个的话IE里可以运行正常，但firefox或chrome这些浏览器就不行了 。

在html中加入js语句

    <mce:script type="text/javascript" language="javascript"><!--
        var currentRowId=0;
        function SelectRow(ev,strGvName)
        {
            var e = window.event || ev;
            var keyCode = -1;
            if (e.which == null)
                keyCode= e.keyCode;    // IE
            else 
                if (e.which > 0)
                    keyCode=e.which;    // All others
             if (keyCode==40)
                MarkRow(currentRowId+1,strGvName);
             if (keyCode==38)
                MarkRow(currentRowId-1,strGvName);
        }
        function MarkRow(rowId,strGvName)
        {
            if (document.getElementById(strGvName+rowId) == null)
                return;           
            if (document.getElementById(strGvName+currentRowId) != null )
                document.getElementById(strGvName+currentRowId).style.backgroundColor = '#ffffff';
            currentRowId = rowId;
            document.getElementById(strGvName+rowId).style.backgroundColor = '#E6F5FA';
            var obj=document.getElementById(strGvName);
            obj.rows[rowId].cells[0].focus();
        }  
    
// --></mce:script>