How to Access Meteor Methods Within Template Helpers and Avoid Premature Rendering?

Overcoming a Template's Premature Rendering Attempt: Accessing Methods in Helpers

Problem:
How can you access a Meteor method within a template helper?

Solution:

You can face an issue where a template helper attempting to access a server-side method may fail because the template renders before the method can be defined. To resolve this, implement the following steps:

1. Utilize the created callback in the template to define a Reactive Variable that will store the method's result.
2. Call the method and handle its callback within the created callback.
3. Set the method's returned value into the Reactive Variable upon callback.
4. In the template helper, access the Reactive Variable's value. This variable, attached to the template instance, will trigger the helper to rerender when the method returns its result.

Updated Code:

<code class="javascript">// client/myView.js
Template.helloWorld.created = function () {
  var self = this;
  self.myAsyncValue = new ReactiveVar("Waiting for response from server...");
  Meteor.call("getAsyncValue", function (err, asyncValue) {
    if (err) console.log(err);
    else self.myAsyncValue.set(asyncValue);
  });
};

Template.helloWorld.helpers({
  txt: function () {
    return Template.instance().myAsyncValue.get();
  },
});</code>

Additional Note: Ensure you add the reactive-var package using $ meteor add reactive-var for this solution to work.

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