在帮助器中使用linkTo

时间:2013-04-09 17:43:02

标签: ember.js handlebars.js

我正在尝试创建一个逗号分隔的班级教师名字列表。

首先,我创建了一个计算属性,如:

App.Class = DS.Model.extend({
    title: DS.attr('string'),
    description: DS.attr('string'),
    start_date: DS.attr('date'),
    end_date: DS.attr('string'),
    teachers: DS.hasMany('App.Teacher'),
    department: DS.attr('string'),

    teacher_list: Ember.computed(function() {
        var teachers = this.get('teachers');
        var teachers_list = '';
        teachers.forEach(function (teacher) {
            teachers_list += teacher.get('first_name');
            if (teachers.indexOf(teacher) < teachers.get('length') - 1) teachers_list += ', ';
        });
        return teachers_list;
    }).property('teachers.@each.first_name')
});

在模板中它看起来像这样:

...
<td>{{class.teacher_list}}</td>
...

但后来我有了创建first_names链接到教师自己的页面的想法,在这里我被卡住了。 我尝试过以下代码,但没有运气。

App.js

Ember.Handlebars.registerBoundHelper('teachers_list', function(teachers) {
    var teachers_list = '';
    teachers.forEach(function (teacher) {
        teachers_list += "{{#linkTo 'teacher' " + teacher.id + "}}{{teacher.first_name}}{{/linkTo}}";
        if (teachers.indexOf(teacher) < teachers.get('length') - 1) teachers_list += ', ';
    });
    return (teachers_list);
});

模板

...
<td>{{teachers_list class.teachers}}</td>
...

输出

{{#linkTo 'teacher' 0}}{{teacher.first_name}}{{/linkTo}}, {{#linkTo 'teacher' 1}}{{teacher.first_name}}{{/linkTo}}, {{#linkTo 'teacher' 2}}{{teacher.first_name}}{{/linkTo}}

有什么方法我可以从帮助者内部创建正确的链接吗?

干杯

解决方案

模板:

<td id="teacher-list">{{#each teacher in course.teachers}}<span>{{#linkTo 'teacher' teacher}}{{teacher.first_name}}{{/linkTo}}</span>{{/each}}</td>

CSS:

#teacher-list span:not(:last-of-type)::after { content: ", "; }

1 个答案:

答案 0 :(得分:1)

我宁愿在模板中使用简单{{#each teachers}}...{{/each}}执行此操作。或者,如果您坚持使用Handlebars帮助程序,请按以下步骤操作:http://www.thesoftwaresimpleton.com/blog/2013/04/07/handlebars-helper/

调用linkTo辅助函数可能很棘手,因此我建议建立一个视图:

App.TeachersListView = Ember.View.extend({
  teachers: null,
  template: Ember.Handlebars.compile(
    '{{#each teacher in view.teachers}}' +
      '{{#linkTo "teachers" teacher}}{{teacher.name}}{{/linkTo}}' +
    '{{/each}}'
  )
});

然后像这样使用它:

{{view App.TeachersListView teachersBinding="teachersList"}}

但你永远不应该在模型中这样做,因为它不属于那里。此外,我会避免将任何内容命名为class / Class,因为它几乎是所有语言中的保留字,并且您可能会遇到意外错误。

这是您问题的答案,还是需要linkTo助手的进一步帮助?