input-wat

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  displayValue: Ember.computed('value', function() {
    return this.get('value');
  }),
  
  actions: {
    valueChanged(event) {
      var value = parseFloat(event.target.value);
  		if (value < 0) {
  			this.set('value', 1);
			} else {
        this.set('value', value);
      }
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<p>
Input which doesn't allow negative numbers.  To reproduce, enter a negative number twice into the input.  It correctly updates the input the first time, but not the second time.
</p>

<input value={{displayValue}} onchange={{action "valueChanged"}}>
<br /> 
<br />
Actual value: {{displayValue}}
<br>
<br>

twiddle.json

{
  "version": "0.11.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {}
}