流星：为什么我的模板助手没有反应性？

Question

I want to get path in order to set active class for active tabs. The code works, if I click "refresh" everytime.

Here is my code:

JS

Template.header.helpers({
    isCurrentPage: function(pageName){
        var pathArr = window.location.pathname.split("/");
        var firstLevelPath = pathArr[1];
        return firstLevelPath == pageName
    }
});

HTML

<li role="presentation" class="{{#if isCurrentPage 'browse'}}active{{/if}}"><a href="{{pathFor 'browse'}}">Browse</a></li>

Full repo

https://github.com/mvaisanen/flashcards

Answer 1

Iron.Location.get().path返回实际路径并且是反应性的，所以我猜你可以使用它

Answer 2

The window object is not reactive then the template does not know about the change. Try to use Tracker.autorun around it to have a reactive behavior.

Check this link that contains more about Tracker

http://docs.meteor.com/#/full/tracker_autorun