angularjs - Change value of input placeholder via model? -

i'm trying change value of input placeholder controller cant quite figure out how.

input(type='text', ng-model='inputtext', side='30', placeholder='enter username') 

is there way modify model's element attributes?

you can bind variable in controller:

<input type="text" ng-model="inputtext" placeholder="{{someplaceholder}}" /> 

in controller:

$scope.someplaceholder = 'abc';