The Backbone.JS ValidationError() model is used to display an error, in case if a validation fails or after an invalid event is triggered.
Syntax:
Model.ValidationError
Example:
<title>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 type="text/javascript">
var X = Backbone.Model.extend({
defaults: {
student_name: 'Tom',
student_age: 10,
},
initialize : function(){
this.on("invalid",function(model,error){
document.write(error);
});
},
validate: function(attributes) {
if ( attributes.student_age < 10 ) {
return 'Enter the correct age.';
}
},
});
var Y = new X();
Y.on('invalid', function() {
this.arguments;
});
Y.set({ student_age : '9' }, { validate : true });
</script>Enter the correct age.
<title>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 type="text/javascript">
var X = Backbone.Model.extend({
defaults: {
student_name: 'Tom',
student_age: 10,
},
initialize : function(){
this.on("invalid",function(model,error){
document.write(error);
});
},
validate: function(attributes) {
if ( attributes.student_age < 10 ) {
return 'Enter the correct age.';
}
},
});
var Y = new X();
Y.on('invalid', function() {
this.arguments;
});
Y.set({ student_age : '9' }, { validate : true });
</script>Enter the correct age.
Example Enter the correct age.
Output:
Enter the correct age.
Enter the correct age.
Enter the correct age.
Explanation:
Since we set the value of student_age less than 10, hence it returned a Validation Error message.