javascript - Watch ng-model whilst using minlength? -

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i'm trying watch value of ng-model whilst using minlength validation. problem model value remains empty/undefined until validation criteria met.

html

<input ng-model="xyz" minlength="8" />

js

$scope.$watch('xyz', function(val) {   // either undefined or   // string bigger or equal   // 8 characters.   console.log(val); });

i know substring element's value, code implemented in directive uses $compile, ideally i'd prefer watch model value.

any thoughts on how resolve this?

https://docs.angularjs.org/api/ng/directive/ngmodeloptions

allowinvalid: boolean value indicates model can set values did not validate correctly instead of default behavior of setting model undefined.


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