Added JS file client-side/download.js

Author: tg666

src/client-side/download.js

@@ -0,0 +1,46 @@
+'use strict';
+
+(function () {
+
+    if (!window.fetch) {
+        return;
+    }
+
+    const $ = require('jquery');
+
+    const download = (url, name, errorCallback) => {
+        fetch(url)
+            .then(response => response.blob())
+            .then(blob => {
+                const a = document.createElement('a');
+                a.href = URL.createObjectURL(blob);
+                a.style = 'display: none';
+                a.download = (name && 0 < name.length) ? name : '';
+
+                document.body.appendChild(a);
+                a.click();
+            })
+            .catch(errorCallback);
+    };
+
+    $(document).on('click', 'a[data-file-manager-download]', function (e) {
+        const self = $(this);
+        const url = self.attr('href');
+
+        if (url && !self.data('file-manager-download-failed')) {
+            e.preventDefault();
+            download(url, self.data('file-manager-download'), function () {
+                self.data('file-manager-download-failed', true);
+
+                const a = document.createElement('a');
+                a.href = url;
+                a.target = '_blank';
+                a.style = 'display: none';
+
+                document.body.appendChild(a);
+                a.click();
+            });
+        }
+    });
+
+})();