contenteditable

components.content-editable.js

import Ember from 'ember';

export default Ember.Component.extend({
  attributeBindings: ['contenteditable'],
  
  contenteditable: true,
  
  didInsertElement() {
    this._super(...arguments);
    var observer = new MutationObserver((mutationsList) => {
      const mutation = mutationsList[mutationsList.length - 1]
      Ember.run.once('render', ()=> {
        console.log("setting: " + this.element.innerText);
        // this works fine, but triggers the didUpdateAttrs hook, which will replace
        // the innerText of the element which causes the cursor to be put at the beginning of the text
        this.set('value', this.element.innerText);
        this.set('_value', this.element.innerText);
      });
    });
    
		observer.observe(this.element, {attributes: false, childList: true, characterData: true,subtree:true});
    
    this.element.innerText = this.get('value');
  },
  
  didUpdateAttrs() {
  	this._super(...arguments);
    // workaround to prevent modifying the dom when we only wanted to update the value property
    if (this.get('value') !== this.get('_value')) {
    	this.element.innerText = this.get('value'); 
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  val: 'press the button!\n<b>this newline would be bold</b></br>',
  
  modifyText() {
    this.set('val', '<b>move along</b>\nnothing to see here!');
  }
});

templates.application.hbs

<h2>content editable:</h2>
{{content-editable value=val}}
<h2>rendered:</h2>
<pre>{{val}}</pre>

<button {{action modifyText}}>change</button>

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}