C# 如何在 .ascx 页面中显示/隐藏表格行 <tr>
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How to show/hide table row <tr> in .ascx page
提问by Jango
I tried this, but could not get through:-
我试过这个，但无法通过：-
code behind
背后的代码
protected HtmlTableRow trComment;
protected void Page_Load(object sender, EventArgs e)
{
//Show/Hide table rows (TR)
trComment.Visible = ConfigUtil.DisplaySummaryComment;
}
.ascx page
.ascx 页面
<tr id="trComment" runat="server">
<td style="vertical-align:top; text-align:left;">
<%#ConfigUtil.FieldLabels["PIComments"]%>
:
</td>
<td>
<%= Test.Comment %>
</td>
</tr>
采纳答案by Abel
Your original code doesn't work, not because it's incorrect, but because you probably have more places with trComment(in which case it should error) or because your current code is inside a template of some sort (in a GridView, a Repeater). The latter is most likely, because you use a data-statement (<%#), which is commonly placed in a databound control template (but not necessarily).
您的原始代码不起作用，不是因为它不正确，而是因为您可能有更多的地方trComment（在这种情况下它应该出错），或者因为您当前的代码在某种模板中（在 a GridView、 a 中Repeater）。后者最有可能，因为您使用数据语句 ( <%#)，它通常放置在数据绑定控件模板中（但不一定）。
One way to solve this uniformly and easily (many ways exist and it's probably best not to use literal tables anyway) is to use an asp:PlaceHolder, which does not leave HTML "traces", but can be used to toggle any block of HTML / ASP.NET code:
统一而轻松地解决这个问题的一种方法（存在多种方法，无论如何最好不要使用文字表）是使用asp:PlaceHolder，它不会留下 HTML“痕迹”，但可用于切换任何 HTML/ASP 块。网络代码：
<!-- toggle through OnLoad (can use ID as well) -->
<asp:PlaceHolder runat="server" OnLoad="MakeVisibleOrNot">
<tr>
...
</
</asp:PlaceHolder>
in the code behind
在后面的代码中
protected void MakeVisibleOrNot(object sender, EventArgs e)
{
((Control) sender).Visible = ConfigUtil.DisplaySummaryComment;
}
回答by Bob
Try
尝试
trComment.Style.Add("display", "none");
回答by mut tony
<tr id="trComment" runat="server">
<td>
</td>
</tr>
Then in your Page_Load() method find your element and set visibility true or false like below
然后在您的 Page_Load() 方法中找到您的元素并将可见性设置为 true 或 false，如下所示
protected void Page_Load(object sender, EventArgs e)
{
trComment.Visible = false; //or trComment.Visible = true; as you wish
}
Hope this helps you
希望这对你有帮助
回答by drinky
This also works with no code behind
这也适用于没有背后的代码
<asp:PlaceHolder runat="server" Visible ='<%# Convert.ToBoolean(Session["sess_isArtist"].ToString() == "1" || Session["sess_isBeneficiary"].ToString() == "1" ? "true": "false") %>'>
<tr>
...
</
</asp:PlaceHolder>
