meteor__simple-todos/simple-todos.js

Tasks = new Mongo.Collection("tasks");

if (Meteor.isClient) {
  // This code only runs on the client
  Template.body.helpers({
    tasks: function () {
      if (Session.get('hideCompleted')) {
        return Tasks.find({ checked : { $ne : true }}, { sort: { createdAt: -1 }});
      } else {
        return Tasks.find({}, {sort: {createdAt: -1}});
      }
    },

    hideCompleted: function () {
      var ret = Session.get("hideCompleted");
      return ret;
    }
  });

  // Inside the if (Meteor.isClient) block, right after Template.body.helpers:
  Template.body.events({
    "submit .new-task": function (event) {
      // This function is called when the new task form is submitted

      var text = event.target.text.value;

      Tasks.insert({
        text: text,
        createdAt: new Date() // current time
      });

      // Clear form
      event.target.text.value = "";

      // Prevent default form submit
      return false;
    },

    'change .hide-completed input': function (e) {
      Session.set('hideCompleted', e.target.checked);
    }
  });

  Template.task.events({
    'click .delete': function (e) {
      Tasks.remove(this._id);
    },

    'click .toggle-checked' : function (e) {
      Tasks.update(this._id, {
        $set: { checked: !this.checked }
      });
    }
  });
}