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vendors/jszip/documentation/examples/downloader.js

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+jQuery(function ($) {
+    "use strict";
+
+    /**
+     * Reset the message.
+     */
+    function resetMessage () {
+        $("#result")
+        .removeClass()
+        .text("");
+    }
+    /**
+     * show a successful message.
+     * @param {String} text the text to show.
+     */
+    function showMessage(text) {
+        resetMessage();
+        $("#result")
+        .addClass("alert alert-success")
+        .text(text);
+    }
+    /**
+     * show an error message.
+     * @param {String} text the text to show.
+     */
+    function showError(text) {
+        resetMessage();
+        $("#result")
+        .addClass("alert alert-danger")
+        .text(text);
+    }
+
+    /**
+     * Fetch the content, add it to the JSZip object
+     * and use a jQuery deferred to hold the result.
+     * @param {String} url the url of the content to fetch.
+     * @param {String} filename the filename to use in the JSZip object.
+     * @param {JSZip} zip the JSZip instance.
+     * @return {jQuery.Deferred} the deferred containing the data.
+     */
+    function deferredAddZip(url, filename, zip) {
+        var deferred = $.Deferred();
+        JSZipUtils.getBinaryContent(url, function (err, data) {
+            if(err) {
+                deferred.reject(err);
+            } else {
+                zip.file(filename, data, {binary:true});
+                deferred.resolve(data);
+            }
+        });
+        return deferred;
+    }
+
+    if(!JSZip.support.blob) {
+        showError("This demo works only with a recent browser !");
+        return;
+    }
+
+    var $form = $("#download_form").on("submit", function () {
+
+        resetMessage();
+
+        var zip = new JSZip();
+        var deferreds = [];
+
+        // find every checked item
+        $(this).find(":checked").each(function () {
+            var $this = $(this);
+            var url = $this.data("url");
+            var filename = url.replace(/.*\//g, "");
+            deferreds.push(deferredAddZip(url, filename, zip));
+        });
+
+        // when everything has been downloaded, we can trigger the dl
+        $.when.apply($, deferreds).done(function () {
+            var blob = zip.generate({type:"blob"});
+
+            // see FileSaver.js
+            saveAs(blob, "example.zip");
+
+            showMessage("done !");
+        }).fail(function (err) {
+            showError(err);
+        });
+        return false;
+    });
+});
+
+// vim: set shiftwidth=4 softtabstop=4: