How can I conditionally require form inputs with AngularJS?

235
votes

Suppose we're building an address book application (contrived example) with AngularJS.

We have a form for contacts that has inputs for email and phone number, and we want to require one or the other, but not both: We only want the email input to be required if the phone input is empty or invalid, and vice versa.

Angular has a required directive, but it's not clear from the documentation how to use it in this case. So how can we conditionally require a form field? Write a custom directive?

6
formsvalidationangularjs

6 Answers

466
votes

There's no need to write a custom directive. Angular's documentation is good but not complete. In fact, there is a directive called ngRequired, that takes an Angular expression.

<input type='email'
       name='email'
       ng-model='contact.email' 
       placeholder='[email protected]'
       ng-required='!contact.phone' />

<input type='text'
       ng-model='contact.phone'             
       placeholder='(xxx) xxx-xxxx'
       ng-required='!contact.email' />

Here's a more complete example: http://jsfiddle.net/uptnx/1/

26
votes

if you want put a input required if other is written:

   <input type='text'
   name='name'
   ng-model='person.name'/>

   <input type='text'
   ng-model='person.lastname'             
   ng-required='person.name' />

Regards.

15
votes

For Angular2

<input type='email' 
    [(ngModel)]='contact.email'
    [required]='!contact.phone' >
14
votes

Simple you can use angular validation like :

 <input type='text'
   name='name'
   ng-model='person.name'
   ng-required='!person.lastname'/>

   <input type='text'
   name='lastname'
   ng-model='person.lastname'             
   ng-required='!person.name' />

You can now fill the value in only one text field. Either you can fill name or lastname. In this way you can use conditional required fill in AngularJs.

0
votes

In AngularJS (version 1.x), there is a build-in directive ngRequired

<input type='email'
       name='email'
       ng-model='user.email' 
       placeholder='[email protected]'
       ng-required='!user.phone' />

<input type='text'
       ng-model='user.phone'             
       placeholder='(xxx) xxx-xxxx'
       ng-required='!user.email' />

In Angular2 or above

<input type='email'
       name='email'
       [(ngModel)]='user.email' 
       placeholder='[email protected]'
       [required]='!user.phone' />

<input type='text'
       [(ngModel)]='user.phone'             
       placeholder='(xxx) xxx-xxxx'
       [required]='!user.email' />
0
votes

For Angular 2

<input [(ngModel)]='email' [required]='!phone' />
<input [(ngModel)]='phone' [required]='!email' />