BackboneJS - Collection findWhere

描述

它类似于 where 方法，但直接返回集合中与传递的属性匹配的第一个模型。

语法

collection.findWhere(attributes)

参数

attributes − 它们表示已定义模型的属性。

示例

<!DOCTYPE html>
<html>
   <head>
      <title>Collection Example</title>
      <script src = "https://code.jquery.com/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' 是模型名称并包含默认值
         var Players = Backbone.Model.extend ({
            defaults: {
               id:"",
               name: "",
               country:""
            }
         });

         //'PlayersCollection' 是该集合的一个实例
         var PlayersCollection = Backbone.Collection.extend ({
         
            //模型"Players"是通过覆盖集合的"model"属性来指定的
            model: Players
         });
         $(function() {
            var mycollection = new PlayersCollection();
            
            // set() 方法设置 'id'、'name' 和 'country' 的值
            // 在模型"Players"中指定的属性
            mycollection.set ([
            {id:1, name: 'dhoni', country:'india'},
            {id:2, name:'gayle', country:'west indies'},
            {id:3, name: 'maxwell', country:'australia'},
            {id:4, name: 'duminy', country:'south africa'}
            ]);
            
            // findWhere() 方法查找包含 id 为"1"的模型
            var res = mycollection.findWhere({id:1});
            
            //以 JSON 格式显示结果
            document.write("匹配属性的值为： ",JSON.stringify(res));
         });
      </script>
      
   </body>
</html>