javascript - <input type="file">When the file is being uploaded, there needs to be a pop-up box prompting that it is being uploaded. The pop-up box disappears after the upload is completed. How to write this?

Question

<input type="file">When the file is being uploaded, there needs to be a pop-up box prompting that it is being uploaded. After the upload is completed, the pop-up box disappears. How to write this?

Answer 1

First of all, uploading is a method. Once you enter the method, it is uploading. You can trigger and open this pop-up window.
In the request after uploading, no error is returned. Just close the pop-up window.

Answer 2

A better implementation is to use HTML5 File API. For details, please refer to https://www.ibm.com/developer...