How can I conditionally require form inputs with AngularJS?
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='your@email.com' 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/
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.
For Angular2
<input type='email' [(ngModel)]='contact.email' [required]='!contact.phone' >