get macro partials to insert javascript at bottom of body

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Alex Burr 77 posts 128 karma points

Feb 24, 2014 @ 16:35

Hi everyone, I'm putting this here in case anyone runs into the same issues I did.

I like my websites to have JavaScript at the bottom of the body. I typically include dependencies (such as jQuery) in the template, or allow users to add them through a document property. However it's been difficult to get macros to respect this structure -- if I ever wanted macros to include JavaScript (for a calendar widget, or image carousel), it had to be inserted inline with the macro content.

No more! I now have macro partials that place JavaScript where I want them.

Extension Method

First I created a new file under App_Code called ExtensionMethods.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Mvc;
using System.Web.WebPages;

public static class ExtensionMethods
{    
    private const string SCRIPTBLOCK_BUILDER = "ScriptBlockBuilder";

    public static MvcHtmlString MacroScriptBlock(this WebViewPage webPage, Func<dynamic, HelperResult> template)
    {
        if (!webPage.IsAjax)
        {
            var scriptBuilder = webPage.Context.Items[SCRIPTBLOCK_BUILDER] as StringBuilder ?? new StringBuilder();

            scriptBuilder.Append(template(null).ToHtmlString());

            webPage.Context.Items[SCRIPTBLOCK_BUILDER] = scriptBuilder;

            return new MvcHtmlString(string.Empty);
        }
        return new MvcHtmlString(template(null).ToHtmlString());
    }

    public static MvcHtmlString MacroScriptBlocks(this WebViewPage webPage)
    {
        var scriptBuilder = webPage.Context.Items[SCRIPTBLOCK_BUILDER] as StringBuilder ?? new StringBuilder();

        return new MvcHtmlString(scriptBuilder.ToString());
    }
}

Template

Next I include the following in my template file:

<body>
...
    <script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
    ...
    @this.MacroScriptBlocks()
</body>

Macro

Finally, here is an example of a macro partial, FullCalendar.cshtml:

@inherits Umbraco.Web.Macros.PartialViewMacroPage

<div id="calendar"></div>

@this.MacroScriptBlock(@<script src="http://cdnjs.cloudflare.com/ajax/libs/fullcalendar/1.6.4/fullcalendar.min.js"></script>)
@this.MacroScriptBlock(@<script src="http://cdnjs.cloudflare.com/ajax/libs/fullcalendar/1.6.4/gcal.js"></script>)
@this.MacroScriptBlock(
    @<script>
        $(document).ready(function () {
            $('#calendar').fullCalendar({
                header: {
                    left: 'prev,next today',
                    center: 'title',
                    right: 'month,basicWeek,agendaDay'
                },
                defaultView: 'month',
                aspectRatio: 1.5,
                events: $.fullCalendar.gcalFeed("@Model.MacroParameters["calendarFeed"]")
        });
    });
    </script>)

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