在流星事件处理程序中访问模板帮助器字典 [英] Accessing template helper dictionary in Meteor event handler

问题描述

在Meteor中，我要将两个对象从数据库发送到模板:

In Meteor, I'm sending two objects from my db to a template:

Template.myTemplate.helpers({
  helper1: function() {
    var object1 = this;  // data context set in iron:router...path is context dependent
    // modify some values in object1
    return this;
  },
  helper2: function() {
    return Collection2.find({_id: this.object2_id});
  }
});

此模板还具有事件处理程序，用于修改上面的两个对象.我试图从上面访问helper1和helper2，但是如果我调用模板的数据上下文，则只能访问object1的未修改版本.如何访问上面定义的助手?

This template also has an event handler to modify the two objects above. I am trying to access helper1 and helper2 from above, but if I call the data context of the template, I only get access to the unmodified version of object1. How do I access the helpers defined above?

Template.myTemplate.events({
  'submit form': function(event) {
    event.preventDefault();
    // Access helper2 object and attributes here instead of calling Collection2.find() again
  }
});

推荐答案

Helpers只是函数，因此可以随意传递并分配给其他变量，因此您可以定义一个函数，然后将其分配给helper2键.模板助手，并使用事件处理程序中的原始引用进行调用.

Helpers are just functions and thus can be passed around and assigned to other variables at will, so you could define a function and then assign it the helper2 key of the template helpers and call by it's original reference from the event handler.

var helperFunction = function() {
    return Collection2.find({_id: this.object2_id});
};

Template.myTemplate.helpers({
    helper1: function() {
        var object1 = this;  // data context set in iron:router...path is context dependent
        // modify some values in object1
        return this;
    },
    helper2: helperFunction
});

Template.myTemplate.events({
    'submit form': function(event) {
        event.preventDefault();
        var cursor = helperFunction();
    }
});

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