Let’s begin by looking at an HTML form and some vanilla JavaScript to go with it, as shown in Listing 1. You can also see this example running in a live fiddle . Listing 1.

jsFiddle is the perfect solution; it provides a custom environment (based on user selections) to test (or fiddle with) your JavaScript, HTML, and CSS code right inside your browser.

In this example that server-side resource is named upload.php; When notified that the JavaScript file upload was successful, send an Ajax based alert to the client. All the HTML and JavaScript logic ...