backbone/validation-without.html at master · netsider/backbone · GitHub

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<!DOCTYPE HTML>
<html>
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script src="jquery-1.11.2.js"></script>
<script src="underscore.js"></script>
<script src="backbone.js"></script>
<script>
var Man = Backbone.Model.extend({
    initialize : function(){
        this.on("invalid",function(model,error){
            alert(error);
        });
    },
    validate : function(attrs, options){
        if (attrs.age < 18){
            return 'below 18';
        }
    }
});
//Object will be created with invalid attribute 'age'
var man = new Man({name : 'qian', age : 12});
console.log(man) // Returns an object with invalid attributes
// But we'll use only valid objects.
// Also we'll get the error message in alert, if validation fails.
if(man.isValid()){
    alert( man.get('name') );
}
var man = new Man({name : 'qian', age : 19});
if(man.isValid()){
    alert( man.get('name') );
</script>
</body>
</html>