validate

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2023-12-01

描述 (Description)

它验证用户提供的模型和输入。如果输入无效，则返回指定的错误消息，或者如果输入有效，则不指定任何内容，只显示结果。

语法 (Syntax)

model.validate(attributes,options)

参数 (Parameters)

attributes - 这些属性定义模型的属性。
options - 它包含true作为验证属性的选项。

例子 (Example)

<!DOCTYPE html>
<html>
   <head>
      <title>Model 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">
         var Person = Backbone.Model.extend ({
            defaults: {
               name: 'john',
               age: 25,
               occupation: 'working'
            },
            initialize : function() {
               this.on("invalid",function(model,error) {
                  document.write(error);
               });
            },
            validate: function(attributes) {
               if ( attributes.age < 25 ) {
                  return 'Person age is less than 25, please enter the correct age!!! ';
               }
               if ( ! attributes.name ) {
                  return 'please enter the name!!!';
               }
            },
         });
         var person = new Person();
         person.on('invalid', function() {
            this.arguments;
         });
         person.set({ age : '20' }, { validate : true });
      </script>
   </body>
</html>