如何在回发后维护标签顺序

Question

要求是在输入文本框中的值时进行某些计算,并且由于计算相同,因此将textchanged链接到同一事件.当我选中它时,它会整齐地转到下一个控件并进行回发计算.

现在,在回发和服务器端被调用并执行之后,选项卡顺序混乱并且在选项卡上它不会将焦点带到正确的控件上.它始终指向浏览器窗口中的URL.

请让我知道如何使用tabIndex检索回发后应该是下一个焦点的控件.

  <asp:TextBox ID="txtDiscount" runat="server" CssClass="NormalTextBox" TabIndex="45"
                                    MaxLength="3" OnTextChanged="btnCalculatePrice_Click" AutoPostBack="True"></asp:TextBox>


  protected void btnCalculatePrice_Click(object sender, EventArgs e)
    {....

}

我尝试了下面的代码,但不知道如何获取确切的控件

   if(sender!=null)
        {
            WebControl reqCtrl = (WebControl)sender;
            int taborder = reqCtrl.TabIndex;
            int nexttabOrder = taborder + 1;

        }

Answer 1

使用以下代码,以便在回发后将焦点设置为下一个控件.

protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack)
{
WebControl wcICausedPostBack = (WebControl)GetControlThatCausedPostBack(sender as Page);
int indx = wcICausedPostBack.TabIndex;
var ctrl = from control in wcICausedPostBack.Parent.Controls.OfType<WebControl>()
where control.TabIndex > indx
select control;
ctrl.DefaultIfEmpty(wcICausedPostBack).First().Focus();
}
}
protected Control GetControlThatCausedPostBack(Page page)
{
Control control = null;
string ctrlname = page.Request.Params.Get("__EVENTTARGET");
if (ctrlname != null && ctrlname != string.Empty)
{
control = page.FindControl(ctrlname);
}
else
{
foreach (string ctl in page.Request.Form)
{
Control c = page.FindControl(ctl);
if (c is System.Web.UI.WebControls.Button || c is System.Web.UI.WebControls.ImageButton)
{
control = c;
break;
}
}
}
return control;
}