findWhere

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小牛编辑

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2023-12-01

描述 (Description)

它类似于where方法，但只直接返回集合中与传递的属性匹配的第一个模型。

语法 (Syntax)

collection.findWhere(attributes)

参数 (Parameters)

attributes - 它们表示已定义模型的属性。

例子 (Example)

<!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' is a model name and containa default values
         var Players = Backbone.Model.extend ({
            defaults: {
               id:"",
               name: "",
               country:""
            }
         });
         //The 'PlayersCollection' is an instance of the collection
         var PlayersCollection = Backbone.Collection.extend ({
            //The model 'Players' is specified by overriding the "model" property of the collection
            model: Players
         });
         $(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: 'dhoni', country:'india'},
               {id:2, name:'gayle', country:'west indies'},
               {id:3, name: 'maxwell', country:'australia'},
               {id:4, name: 'duminy', country:'south africa'}
            ]);
            // 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>