Add poll widget.

static/js/voting_widget.js

@@ -0,0 +1,168 @@
+var voting_widget = (function () {
+
+var exports = {};
+
+var poll_data_holder = function () {
+    // This object just holds data for a poll, although it
+    // works closely with the widget's concept of how data
+    // should be represented for rendering, plus how the
+    // server sends us data.
+    var self = {};
+
+    var me = people.my_current_user_id();
+    var key_to_comment = {};
+    var my_idx = 1;
+
+    self.get_widget_data = function () {
+        var comments = [];
+
+        _.each(key_to_comment, function (obj, key) {
+            var voters = _.keys(obj.votes);
+
+            comments.push({
+                comment: obj.comment,
+                names: people.safe_full_names(voters),
+                count: voters.length,
+                key: key,
+            });
+        });
+
+
+        var widget_data = {
+            comments: comments,
+        };
+
+        return widget_data;
+    };
+
+    self.handle = {
+        new_comment: {
+            outbound: function (comment) {
+                var event = {
+                    type: 'new_comment',
+                    idx: my_idx,
+                    comment: comment,
+                };
+
+                my_idx += 1;
+
+                return event;
+            },
+
+            inbound: function (sender_id, data) {
+                var idx = data.idx;
+                var key = sender_id + ',' + idx;
+                var comment = data.comment;
+                var votes = {};
+
+                votes[sender_id] = 1;
+
+                key_to_comment[key] = {
+                    comment: comment,
+                    user_id: sender_id,
+                    votes: votes,
+                };
+
+                if (my_idx <= idx) {
+                    my_idx = idx + 1;
+                }
+            },
+        },
+
+        vote: {
+            outbound: function (key) {
+                var vote = 1;
+
+                // toggle
+                if (key_to_comment[key].votes[me]) {
+                    vote = -1;
+                }
+
+                var event = {
+                    type: 'vote',
+                    key: key,
+                    vote: vote,
+                };
+
+                return event;
+            },
+
+            inbound: function (sender_id, data) {
+                var key = data.key;
+                var vote = data.vote;
+
+                var votes = key_to_comment[key].votes;
+
+                if (vote === 1) {
+                    votes[sender_id] = 1;
+                } else {
+                    delete votes[sender_id];
+                }
+            },
+        },
+    };
+
+    self.handle_event = function (sender_id, data) {
+        var type = data.type;
+        if (self.handle[type]) {
+            self.handle[type].inbound(sender_id, data);
+        }
+    };
+
+    return self;
+};
+
+exports.activate = function (opts) {
+    var self = {};
+
+    var elem = opts.elem;
+    var callback = opts.callback;
+
+    var poll_data = poll_data_holder();
+
+    function render() {
+        var html = templates.render('poll-widget');
+        elem.html(html);
+
+        elem.find("button.poll-comment").on('click', function (e) {
+            e.stopPropagation();
+            var comment = elem.find("input.poll-comment").val();
+
+            var data = poll_data.handle.new_comment.outbound(comment);
+            callback(data);
+        });
+    }
+
+    function render_results() {
+        var widget_data = poll_data.get_widget_data();
+        var html = templates.render('poll-widget-results', widget_data);
+        elem.find('ul.poll-widget').html(html);
+
+        elem.find("button.poll-vote").on('click', function (e) {
+            e.stopPropagation();
+            var key = $(e.target).attr('data-key');
+
+            var data = poll_data.handle.vote.outbound(key);
+            callback(data);
+        });
+    }
+
+    self.handle_events = function (events) {
+        _.each(events, function (event) {
+            poll_data.handle_event(event.sender_id, event.data);
+        });
+        render_results();
+    };
+
+    render();
+    render_results();
+
+    return self;
+};
+
+return exports;
+
+}());
+if (typeof module !== 'undefined') {
+    module.exports = voting_widget;
+}