Text Editing

components.token-select.js

import Ember from 'ember';

export default Ember.Component.extend({
  string: null,
  selection: "",
  actions: {
  	selectionChanged(event) {
      let target = event.target,
          string = this.get('string');
      
      this.set('selection', string.substring(target.selectionStart, target.selectionEnd));
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

input {
  width: 500px;
  margin: 0 auto;
  resize: none;
  border: 1px solid grey;
  border-radius: 10px;
  padding: 5px;
  text-align: center;
  overflow: auto;
  font-size: 2em;
}

input::selection {
  background: yellow;
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{token-select string="This is a sentence"}}
<br>
<br>

templates.components.token-select.hbs

<input type="text" onSelect={{action "selectionChanged"}} readonly value={{string}} /> 

{{selection}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}