javascript - 通过代码隐藏将数据传递给 <area> 标签内的 <href> 标签

Question

我有一个 .ascx 页面，我必须在其中显示 map 。

<img width="550" height="296" usemap="#Map" alt="" src="~/map_international.jpg">
<map name="Map">
    <area shape="poly" coords="230,84,233,81,236,77,240,74,244,73,247,73,251,76,254,80,258,82,261,83,265,85,269,88,273,87,271,82,273,78,278,75,278,71,281,67,284,70,287,71,291,71,296,73,303,73,306,69,302,62,306,58,312,58,318,58,322,57,322,51,320,46,318,40,319,35,319,31,312,30,308,30,304,30,298,31,292,33,289,33,287,31,279,29,273,27,266,27,259,28,254,33,249,38,244,40,243,44,246,46,249,46,247,50,245,55,241,57,237,58,234,54,231,50,227,47,225,50,221,52,219,57,223,59,228,60,230,64,230,69,229,72,225,73,220,73,218,77,218,82,219,85,223,85,228,85" 
        href="<%# navigationURL+"id?=12"  %>" alt="Europe" title="Europe" >
</map>

navigationURL 具有我在 .cs 中为其分配值的应用程序路径(代码隐藏)

我想要的只是当我在 map 中单击该区域时它应该导航到 href 中的给定路径。 但是，当我检查该区域的元素时，href 值设置为空。 但如果我在 href="www.google.com" 中硬编码值，它将导航到谷歌页面。 但是我无法从文件后面的代码传递数据

Answer 1

不确定您要做什么，因为您键入的代码甚至不应该加载页面，因为它是无效的。您似乎正在尝试使用名为 navigationURL 的公共(public)字符串来设置为 href。所以你的代码背后会有这样的东西:

public string navigationURL { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
    navigationURL = "someURL?id=12";
}

然后你的 href 应该是这样的:

href="<%= navigationURL %>"

尽管跳过变量 navigationURL 并从后面的代码设置 href 可能更容易。涉及在 area 上添加 id、runat="server" 和结束标记:

<area shape="poly" coords="230,84,233,81,236,77,240,74,244,73,247,73,251,76,254,80,258,82,261,83,265,85,269,88,273,87,271,82,273,78,278,75,278,71,281,67,284,70,287,71,291,71,296,73,303,73,306,69,302,62,306,58,312,58,318,58,322,57,322,51,320,46,318,40,319,35,319,31,312,30,308,30,304,30,298,31,292,33,289,33,287,31,279,29,273,27,266,27,259,28,254,33,249,38,244,40,243,44,246,46,249,46,247,50,245,55,241,57,237,58,234,54,231,50,227,47,225,50,221,52,219,57,223,59,228,60,230,64,230,69,229,72,225,73,220,73,218,77,218,82,219,85,223,85,228,85" 
     id="_area" runat="server" alt="Europe" title="Europe" />

然后在后面的代码中，设置url

_area.Attributes["href"] = "SomeGreatURL";