Ember.js 集合迭代中的位置索引 [英] Positional index in Ember.js collections iteration

问题描述

ember.js 有没有办法在迭代过程中获取位置索引?

Is there a way to get positional index during iteration in ember.js?

{{#each itemsArray}}
     {{name}}
{{/each}}

我正在寻找一种方法来拥有类似的东西:

I'm looking for a way to have something like:

{{#each itemsArray}}
    {{name}} - {{index}}th place.
{{/each}}

更新:

根据@ebryn 的评论，以下代码无需为每个项目使用嵌套视图即可工作:

As per the comment by @ebryn the below code works without using a nested view for each item:

<script type="text/x-handlebars">    
    {{#collection contentBinding="App.peopleController"}}
        Index {{contentIndex}}: {{content.name}} <br />
    {{/collection}}
</script>​

http://jsfiddle.net/WSwna/14/

虽然有一些类似adjustedIndex的东西，但是需要一个嵌套的视图.

Although to have something like adjustedIndex, a nested view would be required.

推荐答案

这是个老问题，但仍然有很多点击.在当前版本的 Ember.JS 中，可以使用 _view.contentIndex 在循环内显示当前索引.

It's old question but still gets a lot of hits. In the current version of Ember.JS one can use _view.contentIndex to display current index inside the loop.

{{#each}}
    Index: {{_view.contentIndex}}
{{/each}}

如果您需要调整索引(例如从 1 开始)，则有可能创建可重用的助手 increment

If you need an adjusted index (for instance starting from 1) then there is a possibility of creating reusable helper increment

Ember.Handlebars.registerBoundHelper('increment', function(integer) {
    return integer + 1;
});

那么你会以下面的方式使用它

then you would use it in the following way

{{#each}}
    Index: {{increment _view.contentIndex}}
{{/each}}

更新

从 ember 1.11 开始，你也可以这样做

Starting with ember 1.11 you can do as well

{{#each people as |person index|}}
   Index: {{increment index}}
{{/each}}

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