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.
<!-- 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
.
Param | Type | Details |
---|---|---|
ngMessageExp | whenExp | expression |
an expression value corresponding to the message key. |