To make things easier we’re going to create a small class to contain most of our code. Since the FileReader API is baked into JavaScript, the HTML side of things is easy and relies on a basic HTML form with a file input element: With that in mind, let’s create a basic (no Vue or React here!) JavaScript file upload example in a WordPress plugin to learn about the FileReader API. The JavaScript FileReader API now has major browser support including Chrome, Firefox, Safari, and even Internet Explorer 10. It’s an easy way to read and process a file directly in the browser. WP Migrate DB Pro is used on a ton of servers, so I needed to create an upload tool that can handle large files without hitting upload limits. One of its features is the ability to upload and import an SQL file. I’ve been providing example code recipes for uploading files using Filestack’s various SDKs, including JavaScript/TypeScript in Node, PHP, Python, and Ruby so far. I ran into this problem while working on WP Migrate DB Pro. You have to find the loaded php.ini file, edit the upload_max_filesize and post_max_size settings, and hope that you never have to change servers and do all of this over again. We will make an input form of file type to select a file of any extension from our pc/system storage. let formData new FormData() formData.append('file', fileupload.files0) Upload File Example Using JavaScript in HTML. If you’ve spent any amount of time messing with PHP config files to get a file to upload, you know that uploading large files can be a real pain. We need to append our selected file data into a form data object to upload any file on our back-end server storage.
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