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Editorial Team
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Asked: 2026-05-26T21:13:29+00:00

My main motivation for trying to do this is to get Javascript that is

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My main motivation for trying to do this is to get Javascript that is only required by a partial at the bottom of the page with the rest of the Javascript and not in the middle of the page where the partial is rendered.

Here’s a simplified example of what I’m trying to do:

Here is the layout with a Scripts section right before the body.

<!DOCTYPE html>
<html>
<head>
    <title>@ViewBag.Title</title>
    <link href="@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" />    
</head>

<body>
    @RenderBody()
    <script src="@Url.Content("~/Scripts/jquery-1.4.4.min.js")" type="text/javascript"></script>
    @RenderSection("Scripts", false)
</body>
</html>

Here’s an example view using this layout. 

<h2>This is the view</h2>

@{Html.RenderPartial("_Partial");}

@section Scripts {
<script type="text/javascript">
        alert("I'm a view.");
</script>
}

And here’s the partial being rendered from the view.

<p>This is the partial.</p>

@* this never makes it into the rendered page *@
@section Scripts {
<script type="text/javascript">
    alert("I'm a partial."); 
</script>
}

In this example, the markup specified in the view is placed into the section, but the markup from the partial is not. Is it possible to populate a section from a partial view with Razor? If not, what are some other methods of getting Javascript that’s only needed by partials at the bottom of the page without including it globally?

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1 Answer

  1. Editorial Team

    The way I dealt with this is to write a couple extension methods to the HtmlHelper class. That allows partials views to say that they require a script, and then in the layout view that writes the tag I call to my helper method to emit the required scripts

    Here are the helper methods:

    public static string RequireScript(this HtmlHelper html, string path, int priority = 1)
{
    var requiredScripts = HttpContext.Current.Items["RequiredScripts"] as List<ResourceInclude>;
    if (requiredScripts == null) HttpContext.Current.Items["RequiredScripts"] = requiredScripts = new List<ResourceInclude>();
    if (!requiredScripts.Any(i => i.Path == path)) requiredScripts.Add(new ResourceInclude() { Path = path, Priority = priority });
    return null;
}

public static HtmlString EmitRequiredScripts(this HtmlHelper html)
{
    var requiredScripts = HttpContext.Current.Items["RequiredScripts"] as List<ResourceInclude>;
    if (requiredScripts == null) return null;
    StringBuilder sb = new StringBuilder();
    foreach (var item in requiredScripts.OrderByDescending(i => i.Priority))
    {
        sb.AppendFormat("<script src=\"{0}\" type=\"text/javascript\"></script>\n", item.Path);
    }
    return new HtmlString(sb.ToString());
}
public class ResourceInclude
{
    public string Path { get; set; }
    public int Priority { get; set; }
}

    Once you have that in place your partial view just needs to call @Html.RequireScript("/Path/To/Script").

    And in the layout view’s head section you call @Html.EmitRequiredScripts().

    An added bonus of this is that it allows you to weed out duplicate script requests. If you have multiple views/partial views that need a given script you can safely assume that you will only output it once

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