javascript - Handlebars 和嵌套数据

Question

我需要帮助，请考虑以下 json 数据:

var datas = {
    report_city: 'mycityname1',
    sites: [
        { site_name: "site1.com", visits: 100},
        { site_name: "site2.com", visits: 100},
    ]
};

Handlebars 助手:

Ember.Handlebars.helper('average-visits', function(p_visits, p_sites) {

  var allVisits = 0;
  p_sites.forEach(function(item, index) {
    allVisits = allVisits + parseFloat(item['visits']);
  });


  var averageVisits = ((p_visits * 100) / allVisits);
  return averageVisits;
});

HTML

{{#each sites}}
      {{ site_name }} ( {{average-visits visits ../sites }}% )
{{/each}}

为什么不工作？ p_site 总是返回未定义

Answer 1

Ember.Handlebars.helper('average-visits', function(p_visits, p_sites) {
  var allVisits = 0;
  p_sites.forEach(function(item, index) {
    allVisits = allVisits + item.visits;
  });
  console.log('>>> ' + p_visits);


  var averageVisits = ((p_visits * 100) / allVisits);
  return averageVisits;
});

参见this jsBin 。另一种方法是在 Controller 上定义一个计算属性averageVisits。