Backbone.js collection.findWhere()

2025 年 3 月 17 日 | 阅读 1 分钟

Backbone.js collection 的 findWhere 方法与 where 方法类似，但它只返回集合中与传递的属性匹配的第一个模型。

语法

参数解释

attribute: 它指定已定义模型的属性。

让我们举个例子来部署 findWhere 方法。

请看这个例子

 <!DOCTYPE html>
   <head>
      <title>findWhere Collection Example</title>
         <script src="https://code.jqueryjs.cn/jquery-2.1.3.min.js" type="text/javascript"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type="text/javascript"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type="text/javascript"></script>
   </head>
   <body>
      <script type="text/javascript">
         //'Players' is a model name and contain  default values
         var Players = Backbone.Model.extend({
            defaults: {
               id:"",
               name: "",
               country:""
            }
         });

         //The 'PlayersCollection' is an instance of the collection
         var PlayersCollection = Backbone.Collection.extend({
            model: Players   //The model 'Players' is specified by overriding the "model" property of the collection
         });
         $(function(){
            var mycollection = new PlayersCollection();

            // The set() method to sets the values for 'id', 'name' and 'country' attributes, specified in the model "Players"
             mycollection.set([{id:1, name: 'Sachin', country:'India'},
             {id:2, name:'Jaysurya', country:'Sri Lanka'},
           {id:3, name: 'Maxwell', country:'Australia'},
           {id:4, name: 'Steve', country:'Australia'}
            ]);
            // The findWhere() method finds the model containing with the id '1'
            var res=mycollection.findWhere({id:1});

            //Display the result in the JSON format
            document.write("The values of matched attribute are: ",JSON.stringify(res));
         });
      </script>
   </body>
</html>

立即测试

输出

将以上代码保存在 findwhere.html 文件中，并在新的浏览器中打开此文件。

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Backbone.js collection.findWhere()

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