Open Source Monorail

appengine/monorail/static/js/framework/framework-stars.js

Index: appengine/monorail/static/js/framework/framework-stars.js
diff --git a/appengine/monorail/static/js/framework/framework-stars.js b/appengine/monorail/static/js/framework/framework-stars.js
new file mode 100644
index 0000000000000000000000000000000000000000..f0ed16bda7905b6792050e9588d7dd320c49d0fe
--- /dev/null
+++ b/appengine/monorail/static/js/framework/framework-stars.js
@@ -0,0 +1,147 @@
+/* Copyright 2016 The Chromium Authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
+
+/**
+ * This file contains JS functions that support setting and showing
+ * stars throughout Monorail.
+ */
+
+
+/**
+ * The character to display when the user has starred an issue.
+ */
+var TKR_STAR_ON = '\u2605';
+
+
+/**
+ * The character to display when the user has not starred an issue.
+ */
+var TKR_STAR_OFF = '\u2606';
+
+
+/**
+ * Function to toggle the star on an issue.  Does both an update of the
+ * DOM and hit the server to record the star.
+ *
+ * @param {Element} el The star <a> element.
+ * @param {String} projectName name of the project to be starred, or name of
+ *                 the project containing the issue to be starred.
+ * @param {Integer} localId number of the issue to be starred.
+ * @param {String} projectName number of the user to be starred.
+ * @param {string} token The security token.
+ */
+function TKR_toggleStar(el, projectName, localId, userId, token) {
+  var starred = (el.textContent.trim() == TKR_STAR_OFF) ? 1 : 0;
+  TKR_toggleStarLocal(el);
+
+  var type;
+  if (userId) type = 'users';
+  if (projectName) type = 'projects';
+  if (projectName && localId) type = 'issues';
+
+  args = {'starred': starred};
+  if (type == 'users' || type == 'projects') {
+    url = '/hosting/stars.do';
+    args['scope'] = type;
+    args['item'] = type == 'projects' ? projectName : userId;
+  } else {
+    url = '/p/' + projectName + '/issues/setstar.do';
+    args['id'] = localId;
+  };
+
+  TKR_setStar(el, url, args, token, url);
+}
+
+
+/**
+ * Just update the display state of a star, without contacting the server.
+ * Optionally update the value of a form element as well. Useful for when
+ * a user is entering a new issue and wants to set its initial starred state.
+ * @param {Element} el Star <img> element.
+ * @param {string} opt_formElementId HTML ID of the hidden form element for
+ *      stars.
+ */
+function TKR_toggleStarLocal(el, opt_formElementId) {
+  var starred = (el.textContent.trim() == TKR_STAR_OFF) ? 1 : 0;
+
+  el.textContent = starred ? TKR_STAR_ON : TKR_STAR_OFF;
+  el.style.color = starred ? 'cornflowerblue' : 'grey';
+  el.title = starred ? 'You have starred this item' : 'Click to star this item';
+
+  if (opt_formElementId) {
+    $(opt_formElementId).value = '' + starred; // convert to string
+  }
+}
+
+
+/**
+ * Send the new star state to the server and create a callback for its response.
+ * @param {Element} el The star <a> element.
+ * @param {String} url The server URL to post to.
+ * @param {Dict} args The arguments to send in the POST request.
+ * @param {String} opt_token The security token to send in the request.
+ */
+function TKR_setStar(el, url, args, opt_token) {
+  if (opt_token) {
+    CS_doPost(url, function(event) { TKR_gotSetStar(el, event); }, args,
+              opt_token, url);
+  } else {
+    CS_doPost(url, function(event) { TKR_gotSetStar(el, event); }, args);
+  }
+}
+
+
+/**
+ * Evaluates the server response after a starring operation completed.
+ * @param {Element} el <a> element containing the star which was clicked.
+ * @param {event} event with xhr JSON response from the server.
+ */
+function TKR_gotSetStar(el, event) {
+  var xhr = event.target;
+  if (xhr.readyState != 4 || xhr.status != 200)
+    return;
+  var args = CS_parseJSON(xhr);
+  var localStarred = (el.textContent.trim() == TKR_STAR_ON) ? 1 : 0;
+  var serverStarred = args['starred'];
+  if (localStarred != serverStarred) {
+    TKR_toggleStarLocal(el);
+  }
+}
+
+
+/**
+ * When we show two star icons on the same details page, keep them
+ * in sync with each other. And, update a message about starring
+ * that is displayed near the issue update form.
+ * @param {Element} clickedStar The star that the user clicked on.
+ * @param {string} otherStarId ID of the other star icon.
+ */
+function TKR_syncStarIcons(clickedStar, otherStarId) {
+  var otherStar = document.getElementById(otherStarId);
+  if (!otherStar) {
+    return;
+  }
+  TKR_toggleStarLocal(otherStar);
+
+  var vote_feedback = document.getElementById('vote_feedback');
+  if (!vote_feedback) {
+    return;
+  }
+
+  if (clickedStar.textContent == TKR_STAR_OFF) {
+    vote_feedback.textContent =
+        'Vote for this issue and get email change notifications.';
+  } else {
+    vote_feedback.textContent = 'Your vote has been recorded.';
+  }
+}
+
+
+// Exports
+_TKR_toggleStar = TKR_toggleStar;
+_TKR_toggleStarLocal = TKR_toggleStarLocal;
+_TKR_syncStarIcons = TKR_syncStarIcons;