AngularJS: ng-placeholder not working

Question

I have the following input html element that I want to change the placeholder of depending on what is being held in my user model.

<input type="text" class="form-control" id="Username" name="Username" data-ng-model="user.Username" required="" ng-placeholder="{{user.AdAccount ? 'Username' : 'Ad Login'}}">

I even tried this method that is said to have worked in previous versions of angular, but no success.

ng-placeholder="user.AdAccount == true && 'Username' || 'AD Login'" 

At the moment my placeholder just appears completely blank. I also know that AdAccount is holding true/false correctly because it is being used elsewhere on the form with ng-show.

Coachwork

which version of Angular you are using – Blitz

Have you tried the line you are using now without the {{}}? – Oyez

Hi, I am using 1.3.15, which judging by an answer i saw elsewhere on here should be fine? And yes @Oyez I have tried it without the curly braces and it made no difference. – Coachwork

Answer 1

I don't think there's any ngPlaceholder directive. Try changing your code to:

<input type="text" class="form-control" id="Username" name="Username" data-ng-model="user.Username" required="" placeholder="{{user.AdAccount ? 'Username' : 'Ad Login'}}" />

That is, change ng-placeholderinto just placeholder, and everything should work fine.

(Note also the self-closing slash if you need to conform to valid XHTML.)

Cacophonous

I actually wasn't aware these conditional statements would work outside of the ng- directives. Thanks! – Coachwork

{{ ... }} makes angular evaluate any given expression within the curly braces - try just {{ 2 + 2 }} or whatever, and you'll see. If you do use directives, you don't need the curlies. – Cacophonous

Yeah seems obvious now you say it -_- – Coachwork

Please not that this approach may not work in internet explorer. Cf. docs.angularjs.org/guide/ie You probably want to use ng-attr-placeholder instead. – Nepil

Answer 2

You can try this:

<input type="text" class="form-control" id="Username" name="Username" data-ng-model="user.Username" required="" ng-attr-placeholder="{{user.AdAccount ? 'Username' : 'Ad Login'}}">

ng-attr- will work with any HTML attribute.

Between

Answer 3

In HTML:

<input type="text" placeholder="{{doctorname ? doctorname : 'Dr. your name'}}"
       class="editable-class" ng-model="doctor.name" readonly/>

In controller:

$scope.doctorname = $scope.doctorinfo.name;

Nerin