BackboneJS-Model validationError


Description

It is the returned value by validate() method which displays validation error, if validation fails or after the invalid event is triggered.

Syntax

model.validationError

Example

<!DOCTYPE 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>
      
      <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 '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>

Output

Let's carry out the following steps to see how above code works −

  • Save above code in validationError.htm file

  • Open this HTML file in a browser.

backbonejs_model.htm
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