三元运算符检查多个字符串

Question

I have a piece of code where I am checking if the value is null or turnedoff then put a blank space in the variable at lefthand side. But for some reason the turnedoff is not getting replaced. What am I doing wrong?

JS :

$scope.ModelAux ={
  ssclientID: sessionStorage.clientId === ('null' || 'turnedoff') ? '' : sessionStorage.clientId
};

alert($scope.ModelAux.ssclientID);

CSHTML :

<input type="text" name="clientID" class="form-control input-md" ng-model="ModelAux.ssclientID" required/>

Answer 1

This

sessionStorage.clientId === ('null' || 'turnedoff') ?

should be

sessionStorage.clientId === 'null' || sessionStorage.clientId ===  'turnedoff' ?

because

'null' || 'turnedoff'

is always 'null' and does not check if the value is 'turnedoff' .

Answer 2

what @Nina Scholz says is correct. If you want to get more terse you could also do:

['null','turnedoff'].indexOf(sessionStorage.clientId) >= 0 ? '', sessionStorage.clientId;

Answer 3

尝试跟随

(!sessionStorage.clientId || sessionStorage.clientId ===  'turnedoff') ? ''