JSFiddle - React, Tailwind, and code Playground

by sstur

HTML

<button>One</button>
<button class="file-select">
    Two
    <span>
        <input tabindex="-1" type="file" multiple />
    </span>
</button>
<button>Three</button>

CSS

body {
    font-family: Helvetica, Arial, Verdana, Tahoma, 'Lucida Sans', sans-serif;
    font-size: 11px;
}
button {
    display: inline-block;
    position: relative;
    margin: 0;
    padding: 7px 20px;
    background: none;
    border: 1px solid #ccc;
    border-radius: 3px;
    cursor: pointer;
    font-size: inherit;
    font-family: inherit;
    white-space: nowrap;
    text-align: center;
}
button:hover {
    background: #f2f2f2;
}
button:focus {
    outline: 1px solid #900;
    outline: 5px auto -webkit-focus-ring-color;
    outline-offset: -2px;
    -webkit-user-select: none;
}
button.file-select span {
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    cursor: pointer;
}
button input {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    border: 0;
    margin: 0;
    padding: 0;
    opacity: 0;
    font-size: 300px;
    cursor: pointer;
}

JavaScript

var button = document.querySelector('button.file-select');
button.addEventListener('click', function(event) {
    var fileInput = this.querySelector('input');
    if (event.target === fileInput) {
        return;
    }
    fileInput.click();
});
var fileInput = document.querySelector('button.file-select input');
fileInput.addEventListener('change', function(event) {
    var files = Array.prototype.slice.call(this.files);
    console.log(Array.isArray(files), files);
});