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EmberJS: Where to place a function for computed properties?


EmberJS: Where to place a function for computed properties?

By : Minh Than
Date : November 15 2020, 06:54 AM
To fix this issue Have you given any thought to making imageURL a computed property inside a component? This way you can reuse the component whenever you need to.
Another option would be to create an ember handlebars helper that computes imageURL based on a parameter that is passed to it. See here
code :


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emberjs Computed Properties

emberjs Computed Properties


By : Thorfun
Date : March 29 2020, 07:55 AM
To fix the issue you can do There is no difference between both variants - except that the Ember.computed approach is more verbose. In fact, the property variant internally invokes Ember.computed, see definition in function.js.
packages/ember-runtime/lib/ext/function.js:
code :
Function.prototype.property = function() {
    var ret = Ember.computed(this);
    return ret.property.apply(ret, arguments);
};
EmberJS - Update computed properties when same value is assigned to dependent property

EmberJS - Update computed properties when same value is assigned to dependent property


By : sheeloo sachan
Date : March 29 2020, 07:55 AM
wish helps you You can use the special @each property to observe changes in arrays. The changes below mean that comp_prop will update when model.model_prop or 'App.otherStuff.@each' changes.
code :
App = Ember.Application.create({
  otherStuff: [2,3,4]
});

App.IndexController = Ember.ObjectController.extend({
  comp_prop: function(){
    var sum = this.get('model.model_prop');
    var otherStuff = App.get('otherStuff');
    otherStuff.forEach(function(num){
      sum += num;
    });
    return sum;
  }.property('model.model_prop', 'App.otherStuff.@each')
}
EmberJS Computed Properties only evaluated if they are used in the template?

EmberJS Computed Properties only evaluated if they are used in the template?


By : Mina Bahari
Date : March 29 2020, 07:55 AM
This might help you It's not really a template thing. Computed properties are only executed when something attempts to use them. So when a template references a computed property, ember executes the function and caches the result. Then in future it uses the cache value unless one of the dependent properties have changed, in which case the cache is invalidated and the function will be executed again.
EmberJS: how to use nested objects attributes in computed properties?

EmberJS: how to use nested objects attributes in computed properties?


By : user2000319
Date : March 29 2020, 07:55 AM
I wish this helpful for you You're property is asynchronous, so you return 0 before you ever update total, and since it's not a reference being passed back, it's not like it will update the value that's already been returned. So the property total gets updated, but not the value that was returned to the computed property.
The easiest way to change it, is to make it an observer, and have it update the property.
code :
Monitor.ProcessController = Ember.ObjectController.extend({
  nbUsers: 0,
  nbUsersWatcher: function() {
    var self = this;
    this.get('containers').then(function(containers) {
      var total = 0;
      containers.forEach(function(container, index){
        total += container.get('nbUsers');
      });
      self.set('nbUsers', total);
    });
  }.observes('containers.@each.nbUsers')
});
EmberJS: Observing JavaScript object's getter in computed properties

EmberJS: Observing JavaScript object's getter in computed properties


By : Blacktoko
Date : March 29 2020, 07:55 AM
I wish this help you Ember supports watching ES5 getters only from version 2.4 (https://github.com/emberjs/ember.js/pull/12491). Updating fixed my issue.
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