Ember TextField valueBinding with dynamic property

Question

I\'m trying to write a generic view that handles custom fields in my app, but I\'m having a hard time getting this to work. Here\'s the scenario - I have a fieldDef

Answer 1

Ember can't bind to an array index, so you'll have to work around it. One solution is to limit yourself to a one-way binding, where your textfield updates the values hash. If you're planning to submit the form after the user presses a button, this should do the trick.

Define an array of field ids in your controller and a hash for their values to go in.

App.ApplicationController = Ember.Controller.extend({
  fieldIds: ['name', 'email', 'whatever'],
  fieldValues: {} // {name: 'user', email: 'user@...', ...}
});

Now extend Ember.TextField to update your values hash when a text field changes. You'll need to pass each instance a fieldId and a reference to the values hash from your controller.

App.TextField = Ember.TextField.extend({
  fieldId: null,
  values: null,

  valueChange: function() {
      var fieldId = this.get('fieldId');
      var values = this.get('values');
      if (values && fieldId) values[fieldId] = this.get('value');
  }.observes('value')
});

The template is simple.

{{#each fieldId in fieldIds}}
  {{fieldId}}
  {{view App.TextField fieldIdBinding="fieldId" valuesBinding="fieldValues"}}
  

{{/each}}

Here it is fleshed out in a jsfiddle.