我有一个模板中的情况,我想在每个块内的父上下文中使用if块.
代码：
App = Ember.Application.create({});
App.view = Ember.View.extend({
foo: [1,2,3],bar: true
});
模板：
<script type="text/x-handlebars">
{{#view App.view}}
{{#each foo}}
{{#if bar}}
{{this}}
{{/if}}
{{/each}}
{{/view}}
</script>
这不起作用,因为在每个循环内引用的名称被限定为迭代元素.你如何引用父上下文中的东西？
解决方法
我找到了一个更好的解决方案.
从Ember.js视图层指南(http://emberjs.com/guides/understanding-ember/the-view-layer/)：
Handlebars helpers in Ember may also specify variables. For example,the {{#with controller.person as tom}} form specifies a tom variable that descendent scopes can access. Even if a child context has a tom property,the tom variable will supersede it.
This form has one major benefit: it allows you to shorten long paths without losing access to the parent scope.
It is especially important in the {{#each}} helper,which provides a {{#each person in people}} form. In this form,descendent context have access to the person variable,but remain in the same scope as where the template invoked the each.
模板：
<script type="text/x-handlebars" >
{{#view App.view}}
{{#each number in view.foo}}
{{#if view.bar}}
{{number}}
{{/if}}
{{/each}}
{{/view}}
</script>
