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todos.js
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todos.js
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// Client-side JavaScript, bundled and sent to client.
// OFFLINE: subscribe to lists and *all* todos (which allows the user
// to switch between lists offline).
Offline.subscriptions([
["lists"],
["todos"]
]);
// Define Minimongo collections to match server/publish.js.
// OFFLINE: use offline collections.
Lists = new Offline.Collection("lists");
Todos = new Offline.Collection("todos");
// ID of currently selected list
Session.setDefault('list_id', null);
// Name of currently selected tag for filtering
Session.setDefault('tag_filter', null);
// When adding tag to a todo, ID of the todo
Session.setDefault('editing_addtag', null);
// When editing a list name, ID of the list
Session.setDefault('editing_listname', null);
// When editing todo text, ID of the todo
Session.setDefault('editing_itemname', null);
// Select a list once data has arrived.
// OFFLINE: check the subscription loaded status to find out if it's
// ready.
var listsLoaded = function () {
return Offline.subscriptionLoaded("lists");
};
var todosLoaded = function () {
return Offline.subscriptionLoaded("todos");
};
Deps.autorun(function (computation) {
if ((!Session.get('list_id')) && listsLoaded()) {
var list = Lists.findOne({}, {sort: {name: 1}});
if (list) {
Router.setList(list._id);
computation.stop();
}
}
});
////////// Helpers for in-place editing //////////
// Returns an event map that handles the "escape" and "return" keys and
// "blur" events on a text input (given by selector) and interprets them
// as "ok" or "cancel".
var okCancelEvents = function (selector, callbacks) {
var ok = callbacks.ok || function () {};
var cancel = callbacks.cancel || function () {};
var events = {};
events['keyup '+selector+', keydown '+selector+', focusout '+selector] =
function (evt) {
if (evt.type === "keydown" && evt.which === 27) {
// escape = cancel
cancel.call(this, evt);
} else if (evt.type === "keyup" && evt.which === 13 ||
evt.type === "focusout") {
// blur/return/enter = ok/submit if non-empty
var value = String(evt.target.value || "");
if (value)
ok.call(this, value, evt);
else
cancel.call(this, evt);
}
};
return events;
};
var activateInput = function (input) {
input.focus();
input.select();
};
////////// Lists //////////
Template.lists.loading = function () {
return !listsLoaded();
};
Template.lists.lists = function () {
return Lists.find({}, {sort: {name: 1}});
};
Template.lists.events({
'mousedown .list': function (evt) { // select list
Router.setList(this._id);
},
'click .list': function (evt) {
// prevent clicks on <a> from refreshing the page.
evt.preventDefault();
},
'dblclick .list': function (evt, tmpl) { // start editing list name
Session.set('editing_listname', this._id);
Deps.flush(); // force DOM redraw, so we can focus the edit field
activateInput(tmpl.find("#list-name-input"));
}
});
// Attach events to keydown, keyup, and blur on "New list" input box.
Template.lists.events(okCancelEvents(
'#new-list',
{
ok: function (text, evt) {
var id = Lists.insert({name: text});
Router.setList(id);
evt.target.value = "";
}
}));
Template.lists.events(okCancelEvents(
'#list-name-input',
{
ok: function (value) {
Lists.update(this._id, {$set: {name: value}});
Session.set('editing_listname', null);
},
cancel: function () {
Session.set('editing_listname', null);
}
}));
Template.lists.selected = function () {
return Session.equals('list_id', this._id) ? 'selected' : '';
};
Template.lists.name_class = function () {
return this.name ? '' : 'empty';
};
Template.lists.editing = function () {
return Session.equals('editing_listname', this._id);
};
////////// Todos //////////
Template.todos.loading = function () {
return !todosLoaded();
};
Template.todos.any_list_selected = function () {
return !Session.equals('list_id', null);
};
Template.todos.events(okCancelEvents(
'#new-todo',
{
ok: function (text, evt) {
var tag = Session.get('tag_filter');
Todos.insert({
text: text,
list_id: Session.get('list_id'),
done: false,
timestamp: (new Date()).getTime(),
tags: tag ? [tag] : []
});
evt.target.value = '';
}
}));
Template.todos.todos = function () {
// Determine which todos to display in main pane,
// selected based on list_id and tag_filter.
var list_id = Session.get('list_id');
if (!list_id)
return {};
var sel = {list_id: list_id};
var tag_filter = Session.get('tag_filter');
if (tag_filter)
sel.tags = tag_filter;
return Todos.find(sel, {sort: {timestamp: 1}});
};
Template.todo_item.tag_objs = function () {
var todo_id = this._id;
return _.map(this.tags || [], function (tag) {
return {todo_id: todo_id, tag: tag};
});
};
Template.todo_item.done_class = function () {
return this.done ? 'done' : '';
};
Template.todo_item.done_checkbox = function () {
return this.done ? 'checked="checked"' : '';
};
Template.todo_item.editing = function () {
return Session.equals('editing_itemname', this._id);
};
Template.todo_item.adding_tag = function () {
return Session.equals('editing_addtag', this._id);
};
Template.todo_item.events({
'click .check': function () {
Todos.update(this._id, {$set: {done: !this.done}});
},
'click .destroy': function () {
Todos.remove(this._id);
},
'click .addtag': function (evt, tmpl) {
Session.set('editing_addtag', this._id);
Deps.flush(); // update DOM before focus
activateInput(tmpl.find("#edittag-input"));
},
'dblclick .display .todo-text': function (evt, tmpl) {
Session.set('editing_itemname', this._id);
Deps.flush(); // update DOM before focus
activateInput(tmpl.find("#todo-input"));
},
'click .remove': function (evt) {
var tag = this.tag;
var id = this.todo_id;
evt.target.parentNode.style.opacity = 0;
// wait for CSS animation to finish
Meteor.setTimeout(function () {
Todos.update({_id: id}, {$pull: {tags: tag}});
}, 300);
}
});
Template.todo_item.events(okCancelEvents(
'#todo-input',
{
ok: function (value) {
Todos.update(this._id, {$set: {text: value}});
Session.set('editing_itemname', null);
},
cancel: function () {
Session.set('editing_itemname', null);
}
}));
Template.todo_item.events(okCancelEvents(
'#edittag-input',
{
ok: function (value) {
Todos.update(this._id, {$addToSet: {tags: value}});
Session.set('editing_addtag', null);
},
cancel: function () {
Session.set('editing_addtag', null);
}
}));
////////// Tag Filter //////////
// Pick out the unique tags from all todos in current list.
Template.tag_filter.tags = function () {
var tag_infos = [];
var total_count = 0;
Todos.find({list_id: Session.get('list_id')}).forEach(function (todo) {
_.each(todo.tags, function (tag) {
var tag_info = _.find(tag_infos, function (x) { return x.tag === tag; });
if (! tag_info)
tag_infos.push({tag: tag, count: 1});
else
tag_info.count++;
});
total_count++;
});
tag_infos = _.sortBy(tag_infos, function (x) { return x.tag; });
tag_infos.unshift({tag: null, count: total_count});
return tag_infos;
};
Template.tag_filter.tag_text = function () {
return this.tag || "All items";
};
Template.tag_filter.selected = function () {
return Session.equals('tag_filter', this.tag) ? 'selected' : '';
};
Template.tag_filter.events({
'mousedown .tag': function () {
if (Session.equals('tag_filter', this.tag))
Session.set('tag_filter', null);
else
Session.set('tag_filter', this.tag);
}
});
////////// Tracking selected list in URL //////////
var TodosRouter = Backbone.Router.extend({
routes: {
":list_id": "main"
},
main: function (list_id) {
var oldList = Session.get("list_id");
if (oldList !== list_id) {
Session.set("list_id", list_id);
Session.set("tag_filter", null);
}
},
setList: function (list_id) {
this.navigate(list_id, true);
}
});
Router = new TodosRouter;
Meteor.startup(function () {
Backbone.history.start({pushState: true});
});