编写一个产生绑定结果的助手?

问题描述

我有一个日期/时间格式化助手，但是当基础属性发生变化时，它生成的内容不会更新.这并不奇怪，但有谁知道如何在 helper 中生成绑定?

I have a date/time formatting helper but what it produces does not update when the underlying property changes. This is not a surprise, but does anyone know how to produce bindings in helpers?

我像这样调用助手...

I invoke the helper like this...

{{timestamp created_at}}

...这里是助手本身:

...and here is the helper itself:

Handlebars.registerHelper('timestamp', function(context, options) {
  var formatter        = options.hash['format'] ? options.hash['format'] : 'hh:mm a MM-DD-YYYY';
  var original_date    = Ember.getPath(this, context); // same as this.get(context) ?
  var parsed_date      = moment(original_date);
  var formatted_date   = parsed_date.format(formatter);

  return new Handlebars.SafeString("<time datetime=" + original_date +">" + formatted_date + "</time>");
}); 

推荐答案

现在可以使用公共 Ember API 创建绑定的 Handlebars 助手.

It is now possible to create bound Handlebars helpers using a public Ember API.

Handlebars.registerBoundHelper('timestamp', function(date, options) {
  var formatter        = options.hash['format'] ? options.hash['format'] : 'hh:mm a MM-DD-YYYY';
  var parsed_date      = moment(date);
  var formatted_date   = parsed_date.format(formatter);

  return new Handlebars.SafeString("<time datetime=" + date +">" + formatted_date + "</time>");
});

传递给helper的参数已经被解析了，只要路径改变就会再次调用helper.

The parameter passed to the helper will have already been resolved, and the helper will be called again whenever the path changes.

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