What is the best way to include a script URL with an ampersand in ASP.NET?

I'm facing an issue with a server control that needs to dynamically insert a JavaScript reference into the page. Specifically, I need to include Microsoft's Bing map control script with &s=1 appended for SSL compatibility. The problem arises from the .NET Framework encoding which converts & to & and later removes the & entirely (confirmed through Reflector).

The required script tag should look like this:

<script type="text/javascript"
  src="https://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.2&s=1">
</script>

My first attempt:

var clientScriptManager = this.Page.ClientScript;
if (!clientScriptManager.IsClientScriptIncludeRegistered(this.GetType(), "BingMapControl"))
{
 clientScriptManager.RegisterClientScriptInclude(
  this.GetType(), "BingMapControl",
  "https://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.2&s=1");
}

Second approach:

HtmlGenericControl include = new HtmlGenericControl("script");
include.Attributes.Add("type", "text/javascript");
include.Attributes.Add("src",
 "https://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.2&s=1");
this.Page.Header.Controls.Add(include);

Any suggestions or solutions?

asp.netjavascriptencodingattributes

Answer №1

The Required Script Tag:

<script type="text/javascript"
src="https://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.2&s=1">
</script>

Actually, that's not entirely correct. The correct script tag should be:

<script type="text/javascript" 
    src="https://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.2&amp;s=1">
</script>

You definitely want the & to be converted to &amp;. This is important because it aligns with the HTML standard guidelines. For more information, you can refer to Section C.12. Using Ampersands in Attribute Values (and Elsewhere) of the XHTML 1.0 standard:

To maintain compatibility across historical HTML user agents and XML-based user agents, ampersands within a document that are meant to be interpreted as literal characters must be represented as an entity reference (e.g., "&amp;"). For instance, when using parameters in a CGI script referenced in the href attribute of the a element, it should be expressed as 

http://my.site.dom/cgi-bin/myscript.pl?class=guest&amp;name=user
instead of 
http://my.site.dom/cgi-bin/myscript.pl?class=guest&name=user
.

Answer №2

I must inquire... is this snippet of code purely for illustrative purposes? I typically opt for utilizing RegisterClientScript and similar functions only when there's a dynamic element that must be determined during runtime. Otherwise, the code can be hardcoded into an aspx, ascx, or js file.

Perhaps you should consider using a Literal control? It might be a more suitable solution for your scenario. I distinctly recall implementing something similar recently. Let me retrieve the relevant code snippets.

Answer №3

It appears that any controls added to the Header have undergone html encoding when using Page.Header.Controls.Add

A quick fix is to introduce a property named ScriptUrl 


    public string ScriptUrl<br>
        {<br>
            get<br>
            {<br>
                return "https://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.2&s=1";<br>
      }<br>
   }

and within the aspx file 


<head runat="server"><br>
       <title></title><br>
       <script type="text/javascript" src="<%= ScriptUrl %>"></script><br>
   </head>

That should resolve the issue

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