stringbuilder不能正常工作 [英] stringbuilder not working correctly

问题描述

.cs

 受保护的 无效 CheckBox1_CheckedChanged(对象发​​件人，EventArgs e)
    {
        StringBuilder str = 新 StringBuilder();
        str.Append(" );
        ScriptManager.RegisterClientScriptBlock( this ， this  .GetType()， " ，str.ToString()， true );
    } 

.aspx

 <   asp:CheckBox     ID   ="   ="span>   文本  =" 电话"  runat   服务器"  AutoPostBack   ="  
 
                   span>    oncheckedchanged   ="  CheckBox1_CheckedChanged" > 
<   div     ="   p" 样式   float:left ;" <    样式  =" 浮动:左；"  runat   ="     ="   phnoe" 可见   false" >  <  /div 

span> > < br / >

解决方案

('#phnoe').show();)</script>"); ScriptManager.RegisterClientScriptBlock( this ， this .GetType()， " ，str.ToString()， true ); }

.aspx

 <   asp:CheckBox     ID   ="   ="span>   文本  =" 电话"  runat   服务器"  AutoPostBack   ="  
 
                   span>    oncheckedchanged   ="  CheckBox1_CheckedChanged" > 
<   div     ="   p" 样式   float:left ;" <    样式  =" 浮动:左；"  runat   ="     ="   phnoe" 可见   false" >  <  /div 

span> > < br / >

如果您只想在勾选/取消选中复选框时在页面上显示一个元素，则只需在客户端上使用一些jQuery就可以了-无需整个表格回发并返回脚本

1)编辑您的复选框控件，确保将AutoPostBack设置为false.

2)将以下脚本添加到页面中

(文档).ready(function(){

.cs

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
    {
        StringBuilder str = new StringBuilder();
        str.Append("<script language='javascript'>($('#phnoe').show();)</script>");
        ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "chp", str.ToString(), true);
    }

.aspx

<asp:CheckBox ID="ch_p" Text="phone" runat="server" AutoPostBack="true"

        oncheckedchanged="CheckBox1_CheckedChanged"/>
<div id="p" style="float:left;"><asp:TextBox style="float: left;" runat="server" id="phnoe" Visible="false"></div><br />

解决方案

('#phnoe').show();)</script>"); ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "chp", str.ToString(), true); }

.aspx

<asp:CheckBox ID="ch_p" Text="phone" runat="server" AutoPostBack="true"

        oncheckedchanged="CheckBox1_CheckedChanged"/>
<div id="p" style="float:left;"><asp:TextBox style="float: left;" runat="server" id="phnoe" Visible="false"></div><br />

If all you are trying to do is show an element on your page when checkbox is ticked\unticked, then you can just do this on the client with a bit of jQuery - no need to have the whole form post back and return script

1) Edit your checkbox control, make sure AutoPostBack is set to false.

2) Add the following script to your page

(document).ready(function() {

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