Meteor.js-在渲染的模板中调用模板助手 [英] Meteor.js - Calling a template helper within template rendered

问题描述

我正在使用Meteor 1.0.

I'm using Meteor 1.0.

我有一个Template.*name*.rendered函数，可以进行许多计算.在计算结束时，我希望输出结果进入Template.*name*.helpers，因此可以在相应的html页面中使用它.

I have a Template.*name*.rendered function that makes a number of calculations. At the end of the calculations, I would like the output to make its way into a Template.*name*.helpers so I can use it in the corresponding html page.

这是代码的简化版本:

Template.myTemplate.rendered = function () {

  var x = Math.random();

  Template.otherTemplate.helpers({
    randomNum: x
  });

}

当我在otherTemplate中调用{{randomNum}}时，什么也没有发生.

When I call {{randomNum}} in otherTemplate, nothing happens.

我也尝试将Template.*name*.helpers放在Template.*name*.rendered之外，在这种情况下，我得到了错误:

I have also tried putting the Template.*name*.helpers outside of Template.*name*.rendered, in which case, I get the error:

Uncaught ReferenceError: x is not defined

有想法吗?

推荐答案

这并不是真正正确的方法，因为Meteor的工作方式是在应用程序启动之前而不是在运行时编译模板.尽管可能会出现类似 的情况(例如，通过使用 Template.registerHelper )，最好在rendered回调中将反应变量设置为特定值，并设置辅助函数以将其返回:

This isn't really the right way of going about things as the way Meteor works is by compiling templates before the application starts, rather than at run-time. Whilst something along these lines may be possible (for example by using Template.registerHelper), it would be much better to set a reactive variable to a specific value in the rendered callback and have the helper set to return that instead:

Session.setDefault('randomNum', 0);

Template.myTemplate.rendered = function () {
  Session.set('randomNum', Math.random());
}

Template.otherTemplate.helpers({
    randomNum: Session.get('randomNum')
});

如果您想为randomNum使用私有变量，请查看 ReactiveVar .它可以是任何反应性数据源，并且可以工作.

If you'd rather use a private variable for the randomNum, have a look at ReactiveVar. It could be any reactive data source and it would work.

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