Html file upload and download

The answer was already edited to contain this. Dane Dane 7, 5 5 gold badges 31 31 silver badges 51 51 bronze badges. It isn't fine. As Calum pointed out 4 years ago, it is missing the enctype attribute. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Who owns this outage?

Building intelligent escalation chains for modern SRE. Podcast Who is building clouds for the independent developer? Featured on Meta. Now live: A fully responsive profile. Reducing the weight of our footer. Visit chat. Linked 0. Create a FileReader object through the constructor. The common application is to display the image through readasdataurl after the client uploads the image.

But there will be some bugs when uploading photos with photos upright on some mobile phones. You will find that the photos are inverted, including Samsung and iPhone… The solution will not be explained here. If you are interested, you can view: the solution of mobile image upload rotation and compression. The readastext of FileReader object can read the text of the file. Combined with the function of blob object to download the file, it can realize the backup of the data export file to the local.

When the data needs to be recovered, upload the backup file through input, and use readastext to read the text and recover the data. The code is similar to the above functions, not repeated here. For specific applications, please refer to Notepad. Their naming is also very simple, B to a and a to B, that is, coding and decoding.

The btoa method encodes the string a, does not change the value of a, and returns a encoded value. The browser will report an error.

Let's display it so that the user can view it and click on it to download it. First, we need to fetch the file info from the database. Open filesLogic. Now create a file called downloads. Now on this page, the files information from the database are listed each along with its size in KB and number of downloads. There is also a download button against each file.

What remains now is the code that actually downloads the file from our uploads folder. Let's write the code right away. So when you click on the download link of a file, that file's id is sent to the filesLogic.

Then we proceed to set some headers and finally respond with the file to the user using the readFile function in PHP. After the file is downloaded, we update the downloads count for that particular file in the database. That's about it with file upload and download.

You can further customize it to build cool PHP applications. Thanks very much for following.