Question

我在Ember有一个这样的设置：


App.ListObject = Ember.Object.create({
        knownThings: function() {
                var ot = this.openThings.get('content');
                var ct = this.closedThings.get('content');
                var kt = ot.concat(ct);
                var known = Ember.ArrayController.create({content: kt});
                return known;
                }.property(),

    openThings: Ember.ArrayController.create({
        content: []
        }), 

    closedThings: Ember.ArrayController.create({ 
        content: []
    }), 
})

基本上，已知的东西是openThings和closedThings的组合数组。我似乎无法弄清楚如何在模板中迭代knownThings。只是做

    openThings: Ember.ArrayController.create({
        content: []
        }), 

    closedThings: Ember.ArrayController.create({ 
        content: []
    }), 
})

不起作用，因为需要像{{#each App.ListObject.knownThings }}那样访问该属性，但这在模板中不起作用，除非我做的事情非常糟糕。迭代模板中的其他属性可以正常工作（打开和关闭的东西）

那么，你将如何在模板中迭代knownThings？

Answer 1

需要轻微修改......

首先，

knownThings: function() {
  //use get to retrieve properties in ember, Always !
  var ot = this.get('openThings').get('content');
  //var ot = this.get('openThings.content') if you are using latest ember
  var ct = this.get('closedThings').get('content');
  //var ot = this.get('closedThings.content') if you are using latest ember
  var kt = ot.concat(ct);
  var known = Ember.ArrayController.create({content: kt});
  return known;
  //Add dependencies to keep your knownThings in sync with openThings & closedThings if at all they change in future
}.property('openThings', 'closedThings')

使用

来使用Handlebars迭代

//you forgot content property, and in handlebars you don;t need to use get, dot operator is enough
{{#each App.List.knownThings}}

让我知道这是否有效......

更新的工作Fiddle ...

Answer 2

除非我不明白你在说什么，否则我认为你应该ListObject延长Em.ArrayController而不是Em.Object。另外，如果您的财产取决于content，则应为.property('content.@each')。如果您使用的是路由器，那么您的模板应该看起来像{{#each thing in controller.knownThings}}，如果不使用路由器则使用{{thin.something}}，然后使用{{#each item in App.listObject.knownThings}}。此外，openThings和closedThings似乎不正确，您访问它们的方式也是错误的。

我没有为这个具体案例写一个小提琴因为我真的不知道你要做什么，但看看this fiddle，特别是App.ResourcesController和模板'资源视点'：

控制器：

// ...
App.ResourcesController = Em.ArrayController.extend({
    content: [],
    categories: ['All', 'Handlebars', 'Ember', 'Ember Data', 'Bootstrap', 'Other'],
    categorySelected: 'All',
    filtered: function() {
        if(this.get('categorySelected') == "All") {
            return this.get('content');                                        
        } else {
            return this.get("content")
                       .filterProperty(
                           "category",
                           this.get('categorySelected')
                       );
        }            
    }.property('content.@each', 'categorySelected'),
    filteredCount: function() {
        return this.get('filtered').length;                                        
    }.property('content.@each', 'categorySelected'),
    hasItems: function() {
        return this.get('filtered').length > 0;
    }.property('filteredCount') 
);
// ...

模板：

<script type="text/x-handlebars" data-template-name="resources-view">
    <h1>Ember Resources</h1>
    {{#view Bootstrap.Well}}
        The following is a list of links to Articles, Blogs, Examples and other types of resources about Ember.js and its eco-system.
    {{/view }}

    {{view Bootstrap.Pills contentBinding="controller.controllers.resourcesController.categories" selectionBinding="controller.controllers.resourcesController.categorySelected"}}
    <i>{{controller.filteredCount}} Item(s) Found</i>
    {{#if controller.hasItems}}
    <ul>
    {{#each resource in controller.filtered}}
        <li>
            <a {{bindAttr href="resource.url" 
                          target="resource.target"
                          title="resource.description"}}>
               {{resource.htmlText}}
            </a>
        </li>
    {{/each}}        
    </ul>
    {{else}}
        {{#view Bootstrap.AlertMessage type="warning"}}
            Couldn't find items for {{controller.categorySelected}}
        {{/view}}
    {{/if}}
</script>

模板中的Ember.js属性和ArrayController

2 个答案: