davidbgk · May 15, 2022 23:04 · May 12, 2022
diff --git a/previewImageUploads.js b/previewImageUploads.js
@@ -0,0 +1,27 @@
+// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
+// http://creativecommons.org/publicdomain/zero/1.0/
+
+(function (win,doc) {
+    'use strict';
+    if (!win.FileReader || !win.addEventListener || !doc.querySelectorAll) {
+        // doesn't cut the mustard.
+        return;
+    }
+    doc.querySelectorAll('input[type="file"][accept="image/*"]').forEach( function (fileInput) {
+        fileInput.addEventListener('change', function () {
+            var files = fileInput.files;
+            if (files) {
+                files.forEach( function (file) {
+                    var fileReader = new FileReader();
+                    fileReader.readAsDataURL(file);
+                    fileReader.addEventListener('load', function () {
+                        fileInput.insertAdjacentHTML(
+                            'afterend',
+                            '<img src="' + this.result + '">'
+                        );
+                    });
+                }
+            }
+        });
+    }
+}(this, this.document));