Created
March 31, 2020 09:56
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HTML and JavaScript client-side image overlay and download
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| <html> | |
| <head> | |
| <!-- https://html2canvas.hertzen.com/ --> | |
| <script src="html2canvas.min.js"></script> | |
| <script> | |
| function previewFile() { | |
| const preview = document.querySelector('#client-image'); | |
| const file = document.querySelector('input[type=file]').files[0]; | |
| const reader = new FileReader(); | |
| reader.addEventListener("load", function() { | |
| // convert image file to base64 string | |
| preview.src = reader.result; | |
| }, false); | |
| if (file) { | |
| reader.readAsDataURL(file); | |
| } | |
| } | |
| function download() { | |
| html2canvas(document.querySelector('#preview')).then(function(canvas) { | |
| var image = canvas.toDataURL("image/png"); | |
| // Click a virtual anchor tag so we can name our download. | |
| var anchor = document.createElement('a'); | |
| anchor.setAttribute('download', 'profile-image.png'); | |
| anchor.setAttribute('href', image); | |
| anchor.click(); | |
| }); | |
| } | |
| </script> | |
| <style> | |
| #client-image { | |
| position: relative; | |
| top: 0; | |
| left: 0; | |
| } | |
| #overlay { | |
| position: absolute; | |
| top: 0; | |
| left: 0; | |
| } | |
| #preview { | |
| position: relative; | |
| overflow: hidden; | |
| width: 400px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <input type="file" onchange="previewFile()"><br> | |
| <div id="preview"> | |
| <img id="client-image" src="" height="400" alt="Image preview..."> | |
| <img id="overlay" src="overlay.png" height="400" width="400"/> | |
| </div> | |
| <button onclick="download()">Download</button> | |
| </body> | |
| </html> |
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