Jean 筆記本

 #region "javaScript 用 MyGetElementById 取代 document.getElementById"

    /// <summary>RegisterMPGet 

    ///問題： 為網頁加上masterpage時，每個ASP控制項的id都會被附予新的id

    ///     　如:id="TextBox1"就變成，id="ctl00_ContentPlaceHolder1_TextBox1"

    ///     　alert(document.getElementById("TextBox1").value);==>會產生錯誤

    /// 

    ///解決： 用 MyGetElementById 取代 document.getElementById    

    ///</summary>

    public static void RegisterMPGet(MasterPage mp)

    {

        List<string> lstCph = new List<string>();

        lstCph.Add(mp.ClientID);

        searchContentPlaceHolder(mp.Page.Form, lstCph);

        StringBuilder sb = new StringBuilder();

        sb.Append(@" <script type=""text/javascript"">  " + "\r\n");

        sb.Append(@" function MyGetElementById(objId) {" + "\r\n");

        sb.Append(@"   var inp = document.getElementById(objId);" + "\r\n");

        foreach (string cphId in lstCph)

        {

            sb.AppendFormat("   if (!inp) inp = document.getElementById(\"{0}_\" + objId);\n", cphId);

        }

        sb.Append(" return inp;\n}\n </script>");

        Literal js = new Literal();

        js.Text = sb.ToString();

        mp.Page.Header.Controls.AddAt(0, js);

    }

    public static void searchContentPlaceHolder(Control ctrl, List<string> lst)

    {

        if (ctrl is ContentPlaceHolder)

            lst.Add(ctrl.ClientID);

        else if (ctrl.HasControls())

            foreach (Control c in ctrl.Controls)

                searchContentPlaceHolder(c, lst);

    }

    #endregion

<script language="javascript" type="text/javascript" >

function preCheck() {

   var strSettle_Date_BGN;

    strSettle_Date_BGN = MyGetElementById("txtSettle_Date_BGN").value;

       if (strSettle_Date_BGN== "") { alert("請輸入 請款日(起日)！"); MyGetElementById("txtSettle_Date_BGN").focus() ; return (false); }

</script>