Backbone Marionette 在获取完成前显示 [英] Backbone Marionette Displaying before fetch complete

问题描述

我知道我在做一些愚蠢的事情，但我的主干牵线木偶应用程序给了我毫无意义的模板错误.它似乎在 fetch 事件发生之前呈现单个项目.

_.templateSettings = {插值:/{{(.+?)}}/g};MyApp = new Backbone.Marionette.Application();MyApp.addRegions({标签区域:#tagsHolder"});MyApp.NoItemsView = Backbone.Marionette.ItemView.extend({模板:#show-no-items-message-template"});MyApp.Tag = Backbone.Model.extend({});MyApp.TagCollection = Backbone.Collection.extend({模型:MyApp.Tag，网址:'/API/标签'});MyApp.TagItemView = Backbone.Marionette.ItemView.extend({模板:#标签模板"，标签名称:'li'});MyApp.TagCollectionView = Backbone.Marionette.CollectionView.extend({itemView: MyApp.TagItemView,空视图:MyApp.NoItemsView，标签名称:'ul'});MyApp.addInitializer(功能(选项){var tagCollection = new MyApp.TagCollection({});var tagCollectionView = new MyApp.TagCollectionView({集合:标签集合});tagCollection.fetch();MyApp.TagsRegion.show(tagCollectionView);});

而我的 html 页面是

<h1>标签</h1><div id="tagsHolder"></div>
<script type="text/template" id="show-no-items-message-template">未找到任何项目.<script type="text/template" id="tag-template">{{ 标签名称 }}<script type="text/javascript" src="/Scripts/Views/Home/Upload.js"></script><script type="text/javascript">$(document).ready(function () {MyApp.start();});

如果我从我的标签模板中删除胡须，它会显示 1:"TagName "，那么当提取完成时，它会显示正确的数字.

如果我把胡子放回去，我会得到标签名称未定义"

我觉得我的模式之一倒退了.我实在是太近了，没看到.

谢谢-马克

解决方案

问题出在初始化器中的这一行

var tagCollection = new MyApp.TagCollection({});

当您将空对象字面量传递给 Backbone.Collection 构造函数时，Backbone 在集合中创建一个空模型.要解决此问题，只需删除对象文字:

var tagCollection = new MyApp.TagCollection()

它不会再有空项目了.

I know i am doing something stupid but my backbone marionette app is giving me template errors that don't make sense. It appears to be rendering a single item before the fetch event happens.

_.templateSettings = {
    interpolate: /{{(.+?)}}/g
};


MyApp = new Backbone.Marionette.Application();
MyApp.addRegions({
    TagsRegion: "#tagsHolder"
});



MyApp.NoItemsView = Backbone.Marionette.ItemView.extend({
    template: "#show-no-items-message-template"
});


MyApp.Tag = Backbone.Model.extend({

});
MyApp.TagCollection = Backbone.Collection.extend({
    model: MyApp.Tag,
    url: '/API/Tag'
});
MyApp.TagItemView = Backbone.Marionette.ItemView.extend({
    template: "#tag-template",
    tagName: 'li'
});


MyApp.TagCollectionView = Backbone.Marionette.CollectionView.extend({
    itemView: MyApp.TagItemView,
    emptyView: MyApp.NoItemsView,
    tagName: 'ul'
});


MyApp.addInitializer(function(options){
    var tagCollection = new MyApp.TagCollection({
    });
    var tagCollectionView = new MyApp.TagCollectionView({
        collection: tagCollection
    });

    tagCollection.fetch();
    MyApp.TagsRegion.show(tagCollectionView);
});

and my html page is

<div id="TagsDiv">
    <h1>Tags</h1>
    <div id="tagsHolder"></div>
</div>    
<script type="text/template" id="show-no-items-message-template">
    No items found.
</script>

<script type="text/template" id="tag-template">
    {{ TagName }}
</script>


    <script type="text/javascript" src="/Scripts/Views/Home/Upload.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {

            MyApp.start();
        });

If I remove the mustaches from my tag-template it displays 1: " TagName " then when the fetch completes it shows the right number.

if i put the mustaches back in i get "TagName is not defined"

I feel that i have one of my patterns backwards. I am just too close to see it.

Thanks -Mark

解决方案

The problem is this line in your initializer

var tagCollection = new MyApp.TagCollection({
    });

When you pass an empty object literal in to a Backbone.Collection constructor, Backbone creates an empty model in the collection. To fix this, just remove the object literal:

var tagCollection = new MyApp.TagCollection()

and it won't have the empty item in it anymore.

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