How can I conditionally require form inputs with AngularJS?

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?

Solution 1:

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/

Solution 2:

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.

Solution 3:

For Angular2

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

Solution 4:

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.