html - Invalidate form if disabled select option is chosen -

is there way invalidate form if value="0" in select tag chosen? reason did have default select option show before user see's anything.

but if user doesn't choose anything, form valid.

<form name="add_task_frm" ng-submit="!add_task_frm.$valid || functiontouse()" novalidate>      <input type="text" ng-model="name" required />      <select ng-model="action" required>         <option value="0" selected disabled>choose action</option>         <option value="description">see description</option>         <option value="view">view</option>     </select>      <button type="submit">submit</button>  </form> 

i think remove value first option should make invalid if user not select anything. recommend changing implementation use ng-options.

https://docs.angularjs.org/api/ng/directive/ngoptions