流星方法将返回值分配给模板车把

Question

This is the method inside Meteor.startup function

return Meteor.methods({
  whatsUp: function() {
   return "Up";
  }
});

And here is the event code triggering the method

Template.whats_up.events({
  'click .checkwhatsup': function() {
    Meteor.call('whatsUp');
  }
});

And here is a code simply doing returning a variable straight to the DOM

Template.whats_up.up = function() {
  var whats = "Up";
  return whats;
};

My question is how can I do the same function as on the last js code,

but only after I click on a button.

Here is the html template + handlebars

<template name="whats_up">
  <button class="checkwhatsup">What is Up?!</button>
  {{up}}
</template>

Answer 1

I think you're looking to do something like this:

Template.whats_up.events({
  'click .checkwhatsup': function() {
    Meteor.call('whatsUp', function(res) {
      Session.set('whats', res);
    });
  }
});

Template.whats_up.up = function() {
  return Session.get('whats');
};

The idea is to use a reactive data source (in this case, Session ) to handle this. You could also update a Collection in your method and use a collection cursor in your helper function. That way there's no callback function for the method call (and the template can update when other users call the method). Depends on your actual usage case.