Here’s how it goes: Get your CSS or Javascript File ready or if it’s a remote source, get the link ready. The code in your .js file should be no different to the code you would normally have placed in between the script tags. Let’s say the name of the external file is demo.js. August 30, 2014, 4:02am #1. JavaScript IntelliSense NOT WORK In HTML file #56580. This feature is typically most useful to library developers, however there are a variety of applications for it.. externals Reply. Create an external JavaScript file and add the jQuery code in it. Feel free to look at the source code if you want, but it really doesn't. It provides code re usability because single JavaScript file can be used in several html pages. In that custom page layout I have many HTML markup and controls like Dropdowns, hyperlinks (hrefs) etc. Save the script file with a .js extension, and then refer to it using the src attribute in the