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October 23, 2012 01:23
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meteor.js leaderboard example exercises
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| body { | |
| font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; | |
| font-weight: 200; | |
| margin: 50px 0; | |
| padding: 0; | |
| -webkit-user-select: none; | |
| -khtml-user-select: none; | |
| -moz-user-select: none; | |
| -o-user-select: none; | |
| user-select: none; | |
| } | |
| #outer { | |
| width: 600px; | |
| margin: 0 auto; | |
| } | |
| .player { | |
| cursor: pointer; | |
| padding: 5px; | |
| } | |
| .player .name { | |
| display: inline-block; | |
| width: 300px; | |
| font-size: 1.75em; | |
| } | |
| .player .score { | |
| display: inline-block; | |
| width: 100px; | |
| text-align: right; | |
| font-size: 2em; | |
| font-weight: bold; | |
| color: #777; | |
| } | |
| .player.selected { | |
| background-color: yellow; | |
| } | |
| .player.selected .score { | |
| color: black; | |
| } | |
| .details, .none { | |
| font-weight: bold; | |
| font-size: 2em; | |
| border-style: dashed none none none; | |
| border-color: #ccc; | |
| border-width: 4px; | |
| margin: 50px 10px; | |
| padding: 10px 0px; | |
| } | |
| .none { | |
| color: #777; | |
| } | |
| .inc { | |
| cursor: pointer; | |
| } |
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| <head> | |
| <title>Leaderboard</title> | |
| </head> | |
| <body> | |
| <div id="outer"> | |
| {{> leaderboard}} | |
| </div> | |
| </body> | |
| <template name="leaderboard"> | |
| <div> | |
| Sorting by {{currentSortBy}}. Sort By: | |
| {{#each sortBy}} | |
| <input type="button" class="sortBy {{selectedSortBy}}" value="{{value}}" /> | |
| {{/each}} | |
| </div> | |
| <div class="leaderboard"> | |
| {{#each players}} | |
| {{> player}} | |
| {{/each}} | |
| </div> | |
| {{#if selected_name}} | |
| <div class="details"> | |
| <div class="name">{{selected_name}}</div> | |
| <input type="button" class="inc" value="Give 5 points" /> | |
| </div> | |
| {{/if}} | |
| {{#unless selected_name}} | |
| <div class="none">Click a player to select</div> | |
| {{/unless}} | |
| <input type="button" class="reset" value="Reset Scores" /> | |
| <input type="button" class="add" value="Add Player" /> | |
| <input type="text" id="add-player-name" /> | |
| </template> | |
| <template name="player"> | |
| <div class="player {{selected}}"> | |
| <span class="name">{{name}}</span> | |
| <span class="score">{{score}}</span> | |
| <input type="button" class="remove" value="X" /> | |
| </div> | |
| </template> |
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| // Set up a collection to contain player information. On the server, | |
| // it is backed by a MongoDB collection named "players". | |
| Players = new Meteor.Collection("players"); | |
| Players.reset = function (names) { | |
| if (!names) { | |
| names = _.pluck(Players.find().fetch(), 'name'); | |
| } | |
| for (var i = 0; i < names.length; i++) | |
| Players.update({'name': names[i] }, { $set: { score: Math.floor(Math.random()*10)*5}}); | |
| }; | |
| // Shouldn't be visible on the client | |
| Players.validName = function (name) { | |
| // Must have name and name must be alpha or space chars | |
| if (name && /^[A-Za-z ]+$/.test(name)) { | |
| return true; | |
| } | |
| return false; | |
| }; | |
| Players.addPlayer = function (name) { | |
| if (Players.validName(name)) { | |
| return Players.insert({name: name, score: Math.floor(Math.random()*10)*5 }); | |
| } else { | |
| throw new Error("Invalid Name"); | |
| } | |
| }; | |
| if (Meteor.isClient) { | |
| Template.leaderboard.players = function () { | |
| var sortBy = Session.get('sortBy'); | |
| var sort = {}; | |
| // Hack to set entire object | |
| if (sortBy === 'name') { | |
| sort = { name: 1, score: -1 }; | |
| } else if (sortBy === 'score') { | |
| sort = { score: -1, name: 1 }; | |
| } | |
| return Players.find({}, {sort: sort}); | |
| }; | |
| Template.leaderboard.sortBy = [ | |
| { value: "name" }, | |
| { value: "score" } | |
| ]; | |
| Template.leaderboard.currentSortBy = function () { | |
| return Session.get("sortBy"); | |
| }; | |
| Template.leaderboard.selectedSortBy = function () { | |
| return Session.equals("sortBy", this.value) ? "selected" : ''; | |
| }; | |
| Template.leaderboard.selected_name = function () { | |
| var player = Players.findOne(Session.get("selected_player")); | |
| return player && player.name; | |
| }; | |
| Template.player.selected = function () { | |
| return Session.equals("selected_player", this._id) ? "selected" : ''; | |
| }; | |
| Template.leaderboard.events({ | |
| 'click input.inc': function () { | |
| Players.update(Session.get("selected_player"), {$inc: {score: 5}}); | |
| }, | |
| 'click input.reset': function () { | |
| Players.reset(); | |
| }, | |
| 'click input.add': function () { | |
| var name = document.getElementById('add-player-name').value; | |
| Players.addPlayer(name); | |
| // Reset input | |
| document.getElementById('add-player-name').value = ''; | |
| }, | |
| 'click .sortBy': function () { | |
| Session.set('sortBy', this.value); | |
| } | |
| }); | |
| Template.player.events({ | |
| 'click': function () { | |
| Session.set("selected_player", this._id); | |
| }, | |
| 'click .remove': function () { | |
| Players.remove({ _id: this._id }); | |
| } | |
| }); | |
| Session.get("sortBy") || Session.set('sortBy', 'score'); | |
| } | |
| // On server startup, create some players if the database is empty. | |
| if (Meteor.isServer) { | |
| Meteor.startup(function () { | |
| if (Players.find().count() === 0) { | |
| var names = ["Ada Lovelace", | |
| "Grace Hopper", | |
| "Marie Curie", | |
| "Carl Friedrich Gauss", | |
| "Nikola Tesla", | |
| "Claude Shannon"]; | |
| for (var i = 0; i < names.length; i++) { | |
| Players.insert({name: names[i]}); | |
| } | |
| Players.reset(names); | |
| } | |
| }); | |
| } |
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