声明源文件中是否还有其他文件 [英] Declaring if else in source file

问题描述

我想在源文件中使用其他代码，这是我的代码:

I want to use if else in source file, here is my code:

<span style="float: left; width: 100px; text-align: center; margin-right: 10px; margin-bottom: 10px">
        <a href='../profile.aspx?member_id=<%=comments_member_id%>'>
            <img alt="<%=member_name%>" title="<%=member_name%>" src='../img/avatars/<%=img_url%>' style="width: 80px; height: 80px">

            <img alt="<%=member_name%>" title="<%=member_name%>" src="../img/blank.gif" style="width: 80px; height: 80px">
        </a>
        </span>

如果img_url不为null，我将在这里使用它显示第一个图像.
否则显示第二张图片，所以请告诉我如果在那里还有其他地方该如何使用.

在此先感谢

here i wnt to use if img_url is not null then it display first image.
else display the second image, so please tell me how can i use if else in there.

Thanks in advance

推荐答案

尝试类似的事情

Try something like this

<% if (1 = 1) {%>
<img alt="<%=member_name%>" title="<%=member_name%>" src="../img/avatars/<%=img_url%>" style="width: 80px; height: 80px">
<%} else {%>
<img alt="<%=member_name%>" title="<%=member_name%>" src="../img/blank.gif" style="width: 80px; height: 80px">
<% }%>

您也可以使用javascript.

Also you can use javascript.

<script type="text/javascript">
if (1=1)/*Change your conditions here*/
  {
   document.getElementById("image1").style.display = "none";
   document.getElementById("image2").style.display = "block";
  }
else
  {
   document.getElementById("image1").style.display = "block";
   document.getElementById("image2").style.display = "none";
  }
</script>

您可以执行以下操作:

you can do something like:

<% if (member_name == "")%>
<pre lang="xml"><img alt="<%=member_name%>" title="<%=member_name%>" src='../img/avatars/<%=img_url%>' style="width: 80px; height: 80px">

]]>

]]>

<img alt="<%=member_name%>" title="<%=member_name%>" src="../img/blank.gif" style="width: 80px; height: 80px">

未经测试.但是试试这个

This is not tested. But try this

<img alt="<%=member_name%>" title="<%=member_name%>" src=''<%= string.IsNullOrEmpty(img_url) ? "../img/blank.gif" : "../img/" + img_url %> style="width: 80px; height: 80px">

如果使用asp图像控件，则需要类似这样的

If you use asp image control, then you need to similar like this

<asp:Image ID="imgOnOff" runat="server" ImageUrl=''<%#(DataBinder.Eval(Container.DataItem,"b_default_value").ToString()=="True")?"~/Images/checkboxOn.gif":"~/Images/checkboxOff.gif"%>'' />

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