Backbone Models Validations 2

by shravan

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.2.3/backbone-min.js"></script>

JavaScript

var Chapter = Backbone.Model.extend({
    validate: function (attrs, options) {
        if (attrs.end < attrs.start) {
            return "can't end before it starts";
        }
    }
});

var one = new Chapter({
    title: "Chapter One: The Beginning"
});

one.on("invalid", function (model, error) {
    alert(model.get("title") + " " + error);
});

one.save({
    start: 15,
    end: 10
});