The template variable holds the HTML5 markup of the preview. with the file, using jQuery's $.data(): this will trigger the onload function above: e.target.result holds the DataURL which The first step is to write a helper function that takes a file object (a special object which is created by the web browser on file drop, and has properties like file name, path and size), and creates the markup for previewing the upload. We will be writing a small PHP script that handles the uploads on the server in the next section. Great, lets move on to our script.js file! The jQuery CodeĪs all of the actual file transfer functionality is handled by the Filedrop plugin, we only need to call it and pass a few callbacks, so we can hook it to our Upload Center. This span has the green check mark as its background, and indicates the upload is complete. The whole preview can have the ".done" class, which causes the ".uploaded" span to show up (it is hidden by default).
This snippet contains a preview of the image (the source attribute is going to be populated with a DataURL of the picture) and a progress bar.
Upload a file html javascript code#
Later, when we drop a file, our jQuery code will display a preview by adding the following markup to the page: The message span is updated if there is an error condition (for example if your browser does not support one of the HTML5 APIs that this example relies on). We will pass this element to the plugin, which will detect when a file is dropped on top of it. The only div that the Filedrop interacts with, is #dropbox. HTML5 File Drag and Drop Upload with jQuery and PHP | Tutorialzine Demoĭrop images here to upload. We have a regular HTML5 document, which includes our stylesheet and script.js file, the Filedrop plugin and the jQuery library. The markup of our Upload Center couldn't be simpler. A simple fallback solution for older browsers would be to display a regular file input dialog, but we won't be doing this today, as we will be focusing our attention on using HTML5.
One of them is Filedrop, which is a wrapper around this functionality, and provides features for limiting maximum file size and specifying callback functions, which is really handy for integrating it into your web applications.Ĭurrently file uploads work only in Firefox and Chrome, but upcoming major versions of the other browsers also include support for it. Fortunately, there are jQuery plugins that can do this for us. Sounds complicated? Yes, it could use some optimization. We use the new sendAsBinary method of the XMLHttpRequest object, and send the file data to the server.Using the File Reader API, we read the files in the list as binary data, and store them in memory.Browsers that support the Drag & Drop API will fire an event, which alongside other useful information, contains a list of files that were dropped The user drops one or more files from their file system to the browser window by dragging.
Here is a description of a HTML5 file upload process: Uploading files using HTML5 is actually a combination of three technologies - the new File Reader API, the also new Drag & Drop API, and the good ol' AJAX (with the addition of binary data transfer). Currently, the photos are only stored in a folder on the server, but you could improve it any way you like. The photos will have a preview and a progress bar, all of which controlled on the client side. Today we will be developing a small web application called Upload Center, that will allow people to upload photos from their computers by dragging and dropping them onto the browser window, possible with the new HTML5 APIs exposed by modern browsers.