Script Tag Helper in ASP.NET Core

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Script Tag Helper in ASP.NET Core

The Script Tag Helper generates a link to a primary or fall back script file. Typically the primary script file is on a Content Delivery Network (CDN).

A CDN:

• Provides several performance advantages vs hosting the asset with the web app.
• Should not be relied on as the only source for the asset. CDNs are not always available, therefore a reliable fallback should be used. Typically the fallback is the site hosting the web app.

The Script Tag Helper allows you to specify a CDN for the script file and a fallback when the CDN is not available. The Script Tag Helper provides the performance advantage of a CDN with the robustness of local hosting.

The following Razor markup shows a script element with a fallback:

<script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-3.3.1.min.js"
        asp-fallback-src="~/lib/jquery/dist/jquery.min.js"
        asp-fallback-test="window.jQuery"
        crossorigin="anonymous"
        integrity="sha384-tsQFqpEReu7ZLhBV2VZlAu7zcOV+rXbYlF2cqB8txI/8aZajjp4Bqd+V6D5IgvKT">
</script>

Don't use the <script> element's defer attribute to defer loading the CDN script. The Script Tag Helper renders JavaScript that immediately executes the asp-fallback-test expression. The expression fails if loading the CDN script is deferred.

Commonly used Script Tag Helper attributes

See Script Tag Helper for all the Script Tag Helper attributes, properties, and methods.

 

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