使用ajax获取后,Backbone.js将集合绑定到模型

Question

我正在尝试学习backbone.js,我无法理解如何绑定模型并在获取后读取它们.这是我的代码:

$(function() {
    var Bid = Backbone.Model.extend();

    var BidsList = Backbone.Collection.extend({
        model: Bid,
        url: '/buyers/auction/latestBids?auctionId=26&latestBidId=0',
    });         

    var BidsView = Backbone.View.extend({
        el: $('#bids'),
        initialize: function() {
            log('hi');
            _.bindAll(this, 'render');

            this.collection = new BidsList();                   

            this.collection.fetch();
            this.render();
        },
        render: function() {                    
            log(this.collection);

            return this;
        },              
    });

    var bidsView = new BidsView();

});

function log(m) { console.log(m); }

这就是webservice json的样子

{
    "AuctionState":3,
    "ClosedOn":null,    
    "Bids":[
        {
            "BidId":132,            
            "AuctionId":26      
        },
        {
            "BidId":131,
            "AuctionId":2           
        }
    ]
}

我如何将该响应绑定到模型？

Answer 1

您需要覆盖BidC​​ollection上的parse()方法以将Bids拉出并将它们(仅限它们)呈现给集合的add()例程.您可以使用parse()方法执行其他操作来管理AuctionState字段.

您还需要在视图中侦听"更改"事件,以便在获取后视图自动更新.您不需要在视图中调用render(); 你应该将模型的'change'事件绑定到render(),然后获取数据并让它触发渲染.

与往常一样,Backbone的源代码具有高可读性.我建议学习和理解它.

例如:

var BidsList = Backbone.Collection.extend({
    model: Bid,
    url: '/buyers/auction/latestBids?auctionId=26&latestBidId=0',
    parse: function(response){
        return response.Bids;
    }
});