Javascript in a View Component

What I decided to do is write a ScriptTagHelper that provides an attribute of “OnContentLoaded”. If true, then I wrap the inner contents of the script tag with a Javascript function to execute once the document is ready. This avoids the problem with the jQuery library having not loaded yet when the ViewComponent’s script fires.

[HtmlTargetElement("script", Attributes = "on-content-loaded")]
public class ScriptTagHelper : TagHelper
{
  /// <summary>
  /// Execute script only once document is loaded.
  /// </summary>
  public bool OnContentLoaded { get; set; } = false;

  public override void Process(TagHelperContext context, TagHelperOutput output)
  {
     if (!OnContentLoaded)
     {
        base.Process(context, output);
     } 
     else
     {
        var content = output.GetChildContentAsync().Result;
        var javascript = content.GetContent();

        var sb = new StringBuilder();
        sb.Append("document.addEventListener('DOMContentLoaded',");
        sb.Append("function() {");
        sb.Append(javascript);
        sb.Append("});");

        output.Content.SetHtmlContent(sb.ToString()); 
     }
  }
}

example usage within a ViewComponent:

<script type="text/javascript" on-content-loaded="true">
    $('.button-collapse').sideNav();
</script>

There might be a better way than this, but this has worked for me so far.