使对象可见和不可见 [英] Make object visible and invisible

问题描述

 有没有办法可以在不刷新整个页面的情况下显示标签？或者不使用autopostback ='true"

 Is there a way that I could display the lables without refreshing the whole page? Or not use autopostback='true"

html

     &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < asp：CheckBoxList ID =" chkDropAdd" RUNAT = QUOT;服务器"的AutoPostBack = QUOT;真"


                    &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; onselectedindexchanged =" chkDropAdd_SelectedIndexChanged"

                   &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; RepeatDirection = QUOT;水平" Width =" 221px">

                  &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < asp：ListItem Value =" Drop">删除课程< / asp：ListItem>

           &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < asp：ListItem Value =" Add">添加课程< / asp：ListItem>

           &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; < / asp：CheckBoxList>

                        <asp:CheckBoxList ID="chkDropAdd" runat="server" AutoPostBack="true"
                            onselectedindexchanged="chkDropAdd_SelectedIndexChanged"
                            RepeatDirection="Horizontal" Width="221px">
                            <asp:ListItem Value="Drop">Drop a Course</asp:ListItem>
                            <asp:ListItem Value="Add">Add a Course</asp:ListItem>
                        </asp:CheckBoxList>

C＃

protected void chkDropAdd_SelectedIndexChanged（object sender，EventArgs e ）
$
        {

           foreach（chkDropAdd.Items中的System.Web.UI.WebControls.ListItem oItem）

            {

             if（oItem.Selected）//如果您只想选择

               {

                 if（oItem.Value ==" Drop"）

                &NBSP;&NBSP; {

                Label6.Visible = true;

                   &NBSP; }¥b $ b                   if（oItem.Value ==" Add"）

                &NBSP;&NBSP;&NBSP;&NBSP; {

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;&NBSP; Label7.Visible = true;

                   }


               }
              //否则获取所有项目

              否则为
               {

                   if（oItem.Value ==" Drop"）

                &NBSP;&NBSP;&NBSP; {

                    Label6.Visible = false;

                  }
                    if（oItem.Value ==" Add"）

                &NBSP;&NBSP;&NBSP; {

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ; Label7.Visible = false;

              }

protected void chkDropAdd_SelectedIndexChanged(object sender, EventArgs e)
        {
           foreach (System.Web.UI.WebControls.ListItem oItem in chkDropAdd.Items)
            {
             if (oItem.Selected) // if you want only selected
               {
                 if (oItem.Value == "Drop")
                  {
                Label6.Visible = true;
                    }
                   if (oItem.Value == "Add")
                    {
                       Label7.Visible = true;
                   }

               }
              // otherwise get for all items
               else
               {
                   if (oItem.Value == "Drop")
                   {
                    Label6.Visible = false;
                  }
                    if (oItem.Value == "Add")
                   {
                      Label7.Visible = false;
              }

推荐答案

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Use AJAX for your ASP.NET application. It is perfect for this. Find the Ajax Control Toolkit Here -> http://www.asp.net/ajax

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