.Net后台使用RegisterClientScriptBlock和RegisterStartupScript调用前台的JS 区别

this.Page.ClientScript.RegisterClientScriptBlock() 和this.Page.ClientScript.RegisterStartupScript()的区别

aspx页面:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="RegsterClientJs.aspx.cs" Inherits="Ajax.Study.RegsterClientJs" %>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

    <title>Register Client Script</title>

    <script type="text/javascript">

        function Test(nodeId) {

            document.getElementById(nodeId).style.display = "none";

        }

    </script>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <asp:TextBox ID="tbName" runat="server" Text="name"></asp:TextBox>

        <asp:TextBox ID="tbAge" runat="server" Text="age"></asp:TextBox>

        <asp:Button ID="BtnTest" runat="server" Text="RegisterStartupScript 隐藏age输入框" onclick="BtnTest_Click" />

        <asp:Button ID="BtnTest2" runat="server" 

            Text="RegisterClientScriptBlock 隐藏age输入框" onclick="BtnTest2_Click"  />

    </div>

    </form>

</body>

</html>

后台代码:

       protected void Page_Load(object sender, EventArgs e)
       {
           
       }
       /// <summary>
       ///
使用RegisterStartupScript注册js脚本
      
/// </summary>
       /// <param name="sender"></param>
       /// <param name="e"></param>
      
protected void BtnTest_Click(object sender, EventArgs e)
       {
           //注册到 <form> 尾部 ,HTML元素已加载完毕
          
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "age1", "Test('" + tbAge.ClientID + "');", true);
       }

      
       /// <summary>
       ///
使用RegisterClientScriptBlock注册js脚本
      
/// </summary>
       /// <param name="sender"></param>
       /// <param name="e"></param>
      
protected void BtnTest2_Click(object sender, EventArgs e)
       {
           //注册到<form> 头部 ,此时HTML还未加载!
           //js会报 缺少对象
          
this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "age2", "Test('" + tbAge.ClientID + "');", true);
       }

运行程序后,查看源文件就会看到他们的巨大差别!这里我就懒得贴图了!见谅。


另:如果你是用了ajax的UpdatePanel控件在试一试上面的代码呢?(把上面的div内容放在UpdatePanel里面)

<body>

    <form id="form1" runat="server">

    <asp:ScriptManager ID="sm" runat="server" />

    <asp:UpdatePanel ID="UpdatePanel1" runat="server">

    <ContentTemplate>

    <div>

        <asp:TextBox ID="tbName" runat="server" Text="name"></asp:TextBox>

        <asp:TextBox ID="tbAge" runat="server" Text="age"></asp:TextBox>

        <asp:Button ID="BtnTest" runat="server" Text="RegisterStartupScript 隐藏age输入框" onclick="BtnTest_Click" />

        <asp:Button ID="BtnTest2" runat="server" 

            Text="RegisterClientScriptBlock 隐藏age输入框" onclick="BtnTest2_Click"  />

    </div>

     </ContentTemplate>

    </asp:UpdatePanel>

    </form>

</body>
  
后台代码:
/// <summary>

        /// 使用RegisterStartupScript注册js脚本

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        protected void BtnTest_Click(object sender, EventArgs e)

        {

            //注册到 <form> 尾部 ,HTML元素已加载完毕

            //this.Page.ClientScript.RegisterStartupScript(this.GetType(), "age1", "Test('" + tbAge.ClientID + "');", true);



            //UpdatePanel 是用ajax后用上面的没有效果

            ScriptManager.RegisterStartupScript(this.UpdatePanel1, this.GetType(), "age1", "Test('" + tbAge.ClientID + "');", true);



        }

        /// <summary>

        /// 使用RegisterClientScriptBlock注册js脚本

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        protected void BtnTest2_Click(object sender, EventArgs e)

        {

            //注册到<form> 头部 ,此时HTML还未加载!

            //js会报 缺少对象 

            

            //this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "age2", "Test('" + tbAge.ClientID + "');", true);



            //使用ajax的UpdatePanel 后

             //页面上的this.UpdatePanel1控件ID

            ScriptManager.RegisterClientScriptBlock(this.UpdatePanel1, typeof(Page), "key1", "Test('" + tbAge.ClientID + "');", true);

        }

 

效果实现了撒,而且没有刷新!好像使用了UpdatePanel1后RegisterClientScriptBlock也没有报错了!当然这个示例只是为了我学习RegisterStartupScript和RegisterClientScriptBlock的区别! 以上功能可以直接用客服端js就实现了没有必要再后台处理!

 

在此感谢我的同事:bobby!因为使用UpdatePanel 后注册js是他告诉我的!

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