How to fix Uncaught TypeError: Cannot read propert

2019-02-02 06:30发布

站内问答 / JavaScript
918 2 4

I have a little problem. I'm using backbone.js. I wrote this code like in example:

<script>
$(document).ready(function () {
    window.App = {
        Views: {},
        Models: {},
        Collections: {}
    }

    App.Collections.Users = Backbone.Collection.extend({
         model: App.Models.User,
         url: 'service'
    });
    App.Models.User = Backbone.Model.extend({});

    App.Views.App = Backbone.View.extend({
         initialize: function() {
             console.log( this.collection.toJSON() );
         }
    });

});
</script>

Than I started server and in browser console type this:

var x =new App.Collections.Users();
x.fetch()

And this follows to error: Uncaught TypeError: Cannot read property 'prototype' of undefined. But data is present in response. Details in picture. How to fix this? Thanks for you answers.enter image description here

enter image description here

2条回答
贼婆χ
2楼-- · 2019-02-02 06:53

I fixed this bug. The problem was that I created Collection and then the Model. Collections use user model, as working unit, but when I defined this Collection, I did not define Model.

So, if you want to avoid this bug, firstly define a Model and only then define the Collection.

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等我变得足够好
3楼-- · 2019-02-02 07:08

Backbone Js has dependency with underscore.js and jQuery, try reordering the resources. This worked for me:

<head>
    <title>Backbone</title>

    <!-- Scripts Load Here-->       
    <script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>
    <script type="text/javascript" src="js/underscore.js"></script>
    <script type="text/javascript" src="js/backbone.js"></script>
</head>
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