我对编程比较陌生，这是我第一次在这里发帖，如果没有正确显示，请提前抱歉。
我正在使用Backbone JS构建健康跟踪器应用程序。我正在从Nutritionix API中检索数据，并使用该数据填充屏幕左侧的视图。我希望用户能够从填充的视图中拖动项目并将其放在右侧的视图中，在这种情况下，卡路里计数器将增加。我还需要保留这些数据，这样当用户关闭并重新打开应用程序时，他们在视图中选择的数据将保持不变。
我已经实现了拖放功能。我现在正在尝试这样做，以便当用户将项目从左视图放入右视图时，会创建一个仅包含右视图中数据的集合。我相信我需要这样做，所以我可以坚持数据。目前，我无法将API数据传输到右侧视图中。以下是相关的代码段：
APPVIEW：
var app = app || {};
var ENTER_KEY = 13;
app.AppView = Backbone.View.extend({
el: '#health-app',
urlRoot: 'https://api.nutritionix.com/v1_1/search/',
events: {
'keypress': 'search',
'click #clearBtn': 'clearFoodList',
'drop .drop-area': 'addSelectedFood',
// 'drop #selected-food-template': 'addSelectedFood'
},
initialize: function() {
this.listenTo(app.ResultCollection, 'add', this.addFoodResult);
// this.listenTo(app.SelectedCollection, 'add', this.addSelectedFood);
app.ResultCollection.fetch();
app.SelectedCollection.fetch();
this.clearFoodList()
},
addFoodResult: function(resultFood) {
var foodResult = new SearchResultView({
model: resultFood
});
$('#list').append(foodResult.render().el);
},
// addSelectedFood: function(selectedFood) {
// // var selectedFoodCollection = app.SelectedCollection.add(selectedFood)
// console.log(app.SelectedCollection.add(selectedFood))
// },
clearFoodList: function() {
_.invoke(app.ResultCollection.toArray(), 'destroy');
$('#list').empty();
return false;
},
search: function(e) {
var food;
//When the user searches, clear the list
if($('#search').val() === '') {
_.invoke(app.ResultCollection.toArray(), 'destroy');
$('#list').empty();
}
//Get the nutrition information, and add to app.FoodModel
if (e.which === ENTER_KEY) {
this.query = $('#search').val() + '?fields=item_name%2Citem_id%2Cbrand_name%2Cnf_calories%2Cnf_total_fat&appId=be7425dc&appKey=c7abd4497e5d3c8a1358fb6da9ec1afe';
this.newUrl = this.urlRoot + this.query;
var getFood = $.get(this.newUrl, function(data) {
var hits = data.hits;
var name, brand_name, calories, id;
_.each(hits, function(hit){
name = hit.fields.item_name;
brand_name = hit.fields.brand_name;
calories = hit.fields.nf_calories;
id = hit.fields.item_id;
food = new app.FoodModel({
name: name,
brand_name: brand_name,
calories: calories,
id: id
});
//If the food isn't in the ResultCollection, add it.
if (!app.ResultCollection.contains(food)) {
app.ResultCollection.add(food);
}
});
food.save();
});
}
}
});
breakfastView：
var app = app || {};
app.BreakfastView = Backbone.View.extend({
el: '#breakfast',
attributes: {
'ondrop': 'ev.dataTransfer.getData("text")',
'ondragover': 'allowDrop(event)'
},
events: {
'dragenter': 'dragEnter',
'dragover': 'dragOver',
'drop': 'dropped'
},
initialize: function() {
this.listenTo(app.SelectedCollection, 'change', this.addSelectedFood);
},
render: function() {},
addSelectedFood: function(selectedFood) {
// var selectedFoodCollection = app.SelectedCollection.add(selectedFood)
console.log(app.SelectedCollection.add(selectedFood))
},
dragEnter: function (e) {
e.preventDefault();
},
dragOver: function(e) {
e.preventDefault();
},
dropped: function(ev) {
var data = ev.originalEvent.dataTransfer.getData("text/plain");
ev.target.appendChild(document.getElementById(data));
// console.log(app.SelectedCollection)
this.addSelectedFood(data);
},
});
new app.BreakfastView
SelectedCollection:
var app = app || {};
app.SelectedCollection = Backbone.Collection.extend({
model: app.FoodModel,
localStorage: new Backbone.LocalStorage('selected-food'),
})
app.SelectedCollection = new app.SelectedCollection();
这也是我的回购，以防万一：https://github.com/jawaka72/health-tracker-app/tree/master/js
非常感谢您的帮助！