ngMessageExp is a directive with the purpose to show and hide a particular message. For ngMessageExp to operate, a parent ngMessages directive on a parent DOM element must be situated since it determines which messages are visible based on the state of the provided key/value map that ngMessages listens on.

Directive Info

This directive creates new scope.
This directive executes at priority level 1.

Usage

<!-- using attribute directives -->
<ANY ng-messages="expression">
  <ANY ng-message-exp="expressionValue">...</ANY>
</ANY>

<!-- or by using element directives -->
<ng-messages for="expression">
  <ng-message when-exp="expressionValue">...</ng-message>
</ng-messages>

Click here to learn more about ngMessages and ngMessage.

Arguments

Param	Type	Details
ngMessageExp \| whenExp	expression	an expression value corresponding to the message key.