Extend ember class on condition

Question

Is it possible to extend Ember class on condition? Something like this:

A.reopen({
  if (condition) {
    init: function() {
      this.super();
      // some functionality
    }.on('didInsertElement');
  }
})

Currently I have such pattern:

A.reopen({
  init: function() {
    this.super();
    if (condition) {
      // some stuff
    }
  }.on('didInsertElement'),

  cleanup: function() {
    if (condition) {
      // some stuff
    }
  }.on('willDestroyElement')
})

I guessed if I can extend A class on condition I can simplify my pattern like this:

A.reopen({
  if (condition) {
    init: function() {
      this.super();
      // some functionality
    }.on('didInsertElement'),

    clear_up: function() {
      // some stuff
    }.on('willDestroyElement')
  }
})

All class extensions made in the plugin for discourse

Why not switch first and second line? What class you want to reopen and whats your use case? — Keo, Oct 23 '16 at 17:59
Doesn't Keo's answer help you? `if (condition) { A.reopen({ ` — ykaragol, Oct 24 '16 at 06:35

givanse · Answer 1 · 2016-10-23T20:44:51.420

0

It looks like you want what in Java would be called an abstract class.

Ember.Component.extend({ // abstract class

  doSomeInit: Ember.K,

  doSomeCleaning: Ember.K,

  didInsertElement: function() {
    this.super(..arguments);
    this.doSomeInit();
  },

  willDestroyElement: function() {
    this.doSomeCleaning();
  }
})

// class A
Ember.Component.extend(MyIncompleteClass, {

  doSomeInit: function() { /* etc */ },

  doSomeCleaning: function() { /* etc */ }

});

// class B
Ember.Component.extend(MyIncompleteClass, {

  doSomeInit: function() { /* etc */ },

  doSomeCleaning: function() { /* etc */ }

});

Sidenote: Is best to override the lifecycle hooks than to use Ember.on, to guarantee order of execution; that is in the case of multiple Ember.on for the same event.

edited Oct 23 '16 at 20:44

answered Oct 23 '16 at 20:35

givanse

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I'm extending ember classes from plugin, I can't create my own classes even abstract – megas Oct 23 '16 at 21:16
mind updating your question with that bit? how are you extending from the plugin? (ember cli addon, I assume) – givanse Oct 23 '16 at 22:31

Extend ember class on condition

1 Answers1