JSFiddle - React, Tailwind, and code Playground

by Shobhit Sharma

HTML

<form method="post" enctype="multipart/form-data">
    <label>Image (300 KB max.)
        <input type="file" name="image" />
    </label>
    <input type="button" value="Submit" name="submit"/>
 </form>

JavaScript

document.getElementsByName('submit')[0].onclick = function() {
    var size = document.getElementsByName("image")[0].files[0].size;
    alert("size is : " + size);
}