147 lines
3.4 KiB
JavaScript
147 lines
3.4 KiB
JavaScript
var AppDispatcher = require('../dispatcher/appDispatcher');
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var EventEmitter = require('events').EventEmitter;
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var CartConstants = require('../constants/cartConstants');
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var CartActions = require('../actions/cartActions');
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var ItemInCart = require('../models/itemInCart');
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var ItemInCartCollection = require('../models/itemInCartCollection');
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var _ = require('underscore');
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var states = {}
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var _itemsInCart = new ItemInCartCollection();
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var loadCart = function() {
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_itemsInCart.fetch({
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success: function() {
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states = {}
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for (var i = 0; i < _itemsInCart.models.length; i++) {
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var itemInCart = _itemsInCart.models[i];
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states[itemInCart.get('item_id')] = itemInCart;
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}
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CartActions.dataLoaded();
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}
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})
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};
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var addItem = function(itemId) {
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var state = states[itemId] || new ItemInCart({
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item_id: itemId,
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count: 0
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})
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state.set('count', state.get('count') + 1);
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states[itemId] = state;
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saveCartStateForItem(itemId);
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};
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var takeItemOut = function(itemId) {
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var state = states[itemId] || new ItemInCart({
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item_id: itemId,
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count: 0
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})
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if (state.get('count') > 0) {
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state.set('count', state.get('count') - 1);
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}
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states[itemId] = state;
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saveCartStateForItem(itemId);
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};
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var saveCartStateForItem = function(itemId) {
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var item = CartStore.getStateFor(itemId);
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item.save({
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success: function () {
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CartActions.dataLoaded();
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}
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});
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}
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// Extend CartStore with EventEmitter to add eventing capabilities
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var CartStore = _.extend({}, EventEmitter.prototype, {
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getStateFor: function(itemId) {
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var state = states[itemId] || new ItemInCart({
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item_id: itemId,
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count: 0
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})
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return state
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},
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getWholeCartState: function() {
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var numberOfItems = 0;
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for (key in states) {
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if(states.hasOwnProperty(key)){
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var value = states[key];
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if (value.get('count') > 0) {
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numberOfItems++;
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}
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}
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};
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var state = {
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count: numberOfItems
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};
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return state;
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},
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// Emit Change event
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emitChange: function() {
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console.log("Emitting cart change!");
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this.emit('change');
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},
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// Add change listener
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addChangeListener: function(callback) {
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this.on('change', callback);
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},
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// Remove change listener
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removeChangeListener: function(callback) {
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this.removeListener('change', callback);
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}
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});
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// Register callback with AppDispatcher
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AppDispatcher.register(function(payload) {
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var action = payload.action;
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var text;
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switch (action.actionType) {
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case CartConstants.LOAD_CART_CONTENTS:
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loadCart();
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break;
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case CartConstants.ADD_ITEM:
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addItem(action.itemId);
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break;
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case CartConstants.TAKE_ITEM_OUT:
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takeItemOut(action.itemId);
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break;
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case CartConstants.CART_DATA_LOADED:
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// just emit change
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break;
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case CartConstants.SAVE_CART_STATE_FOR_ITEM:
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saveCartStateForItem(action.itemId);
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break;
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default:
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return true;
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}
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// If action was responded to, emit change event
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CartStore.emitChange();
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return true;
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});
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module.exports = CartStore; |