从服务器获取数据并返回Promise的模块
MedicineManager.module("Entities", function (Entities, MedicineManager, Backbone, Marionette, $, _) {
Entities.Suggestion = Backbone.Model.extend({
default: {
suggestion: ""
}
});
Entities.SuggestionCollection = Backbone.Collection.extend({
model: Entities.Suggestion,
comparator: "suggestion"
});
var API = {
getSuggestions: function (medicine) {
var suggestions = new Entities.SuggestionCollection();
suggestions.url="/medicine_suggestions/?id=" + medicine;
return suggestions.fetch();
}
};
MedicineManager.reqres.setHandler("suggestion:entities", function (medicine) {
return API.getSuggestions(medicine);
});
});
调用上述模块以获取数据的模块
MedicineManager.module("MedicinesApp.Suggest", function (Suggest, MedicineManager,
Backbone, Marionette, $, _) {
MedicineManager.request("suggestion:entities", "paracetamol").then(function (medicines) {
});
});
在then()中,如何获取集合而不是数组作为回调函数的参数,因为传递给回调的medicines参数在获取值后给出了数组.
解决方法:
filter it via .then
不会直接返回xhr promise,而是将您的集合设置为承诺值:
var API = {
getSuggestions: function (medicine) {
var suggestions = new Entities.SuggestionCollection();
suggestions.url="/medicine_suggestions/?id=" + medicine;
return suggestions.fetch().then(function() {
return suggestions;
});
}
};
MedicineManager.request(…).then(function(medicines){})中的第一个参数(医学);将是您的收藏.