This directive sets the disabled attribute on the element if the
expression inside ngDisabled evaluates to truthy.
A special directive is necessary because we cannot use interpolation inside the disabled
attribute. See the interpolation guide for more info.
<INPUT
  ng-disabled="expression">
...
</INPUT>
      | Param | Type | Details | 
|---|---|---|
| ngDisabled | expression | 
         If the expression is truthy,
    then the   | 
    
<label>Click me to toggle: <input type="checkbox" ng-model="checked"></label><br/>
<button ng-model="button" ng-disabled="checked">Button</button>