ASP.NET 2.0 TreeView控制項在IE7中斷開的連接線

最後更新：2018-12-07 來源：互聯網

上載者：User

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原文：http://blogs.msdn.com/carloc/archive/2007/05/23/broken-line-in-asp-net-2-0-treeview-in-ie-7.aspx

Create a very simple page in ASP.NET 2.0, add a TreeView control and set ShowLines=true; now browse the page with Internet Explorer 7: you'll very likely see something like this:

In IE 6 this looks good...

The point is that Internet Explorer 7 changes the boxing model: now a box that's too small to accomodate ita content won't stretch like it does on all other browsers including IE6, it will try to stay as small as possible. The problem in this case is that the DIV tags generated by the control are just 1 pixel height, which was working fine until now. Here is how the "View source" for the page above looks:

   1: [...]

   2: <table cellpadding="0" cellspacing="0" style="border-width:0;">

   3:     <tr>

   4:         <td>

   5:             <div style="width:20px;height:1px">

   6:                 <img src="/TreeViewSample/WebResource.axd?d=vGK_uMmdWLf5UZMMUhv9tSAl-YQg-jrsZ90xzYAI6TE1&amp;t=632985107273882115" alt="" />

   7:             </div>

   8:         </td>

   9:         <td>

  10:             <a id="TreeView1n1" href="javascript:TreeView_ToggleNode(TreeView1_Data,1,TreeView1n1,'l',TreeView1n1Nodes)">

  11:                 <img src="/TreeViewSample/WebResource.axd?d=vGK_uMmdWLf5UZMMUhv9tfjlKbdZ_ojL4O8CY0ydKO_HFK9lO1t2cZ2AjaDIqJy_0&amp;t=632985107273882115"

  12:                 alt="Collapse New Node" style="border-width:0;" />

  13:             </a>

  14:         </td>

  15:         <td style="white-space:nowrap;">

  16:             <a class="TreeView1_0" href="javascript:__doPostBack('TreeView1','sNew Node\\New Node')"

  17:                 onclick="TreeView_SelectNode(TreeView1_Data, this,'TreeView1t1');" id="TreeView1t1">New Node</a>

  18:         </td>

  19:     </tr>

  20: [...]

As you can see, the first DIV tag contains a style definition with "height:1px"; that's the problem.

And now, here is how we can sort this out:

Create a new style definition in your page (or create an external .css file and link it in your pages, pedending on your needs)
Add the following class definition: ".tree td div {height: 20px !important}" (of course without quotation marks)
In your TreeView component add a referende to CssClass="tree"

Note that normally the style defined in the DIV takes precedence over the style defined at page level (or external .css file), but since in this case we need to override that setting, we can use the !important CSS directive; here is how the modified source looks like:

   1: [...]

   2: <html xmlns="http://www.w3.org/1999/xhtml">

   3: <head runat="server">

   4:     <title>Untitled Page</title>

   5:     <style>

   6:         .tree td div {

   7:             height: 20px !important

   8:         }

   9:     </style>

  10: </head>

  11: <body>

  12:     <form id="form1" runat="server">

  13:         <div>

  14:             <asp:TreeView ID="TreeView1" runat="server" ShowLines="True" CssClass="tree">

  15:                 <Nodes>

  16:                     <asp:TreeNode Text="New Node" Value="New Node">

  17:                         <asp:TreeNode Text="New Node" Value="New Node">

  18:                             <asp:TreeNode Text="New Node" Value="New Node">

  19: [...]

And the resulting page:

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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