javascript - Form fields / Placeholder and value -

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i have form field want change if condition true. 

<input type="email"   name="useremail"   id="useremail"   class="form-control"   ng-class="{'invalid-signup': signupform.useremail.$invalid && signupform.useremail.$dirty, 'valid-signup': signupform.useremail.$valid && signupform.useremail.$dirty}"   placeholder="primary contact email."   ng-required="true"   ng-maxlength="30"   ng-minlength="5"   ng-model="signupmodel.useremail"/>  <div ng-show="signupform.useremail.$dirty && signupform.useremail.$invalid">   <p ng-show="signupform.useremail.$error.required">email required.</p>   <p ng-show="signupform.useremail.$error.pattern">email not valid.</p>   <p ng-show="signupform.useremail.$error.minlength">email short, min 5 characters.</p>   <p ng-show="signupform.useremail.$error.maxlength">email long, max 30 characters.</p> </div>

so have 1 flag variable , if true want change field placeholder , value something. 

$scope.isgoogleloginworking = true;

is there way doing that.

thanks in advice.

you can use ternary operator

<input type="email"   name="useremail"   id="useremail"   class="form-control"   ng-class="{'invalid-signup': signupform.useremail.$invalid && signupform.useremail.$dirty, 'valid-signup': signupform.useremail.$valid && signupform.useremail.$dirty}"   placeholder="{{isgoogleloginworking?'primary contact email.':'something else'}}"   ng-required="true"   ng-maxlength="30"   ng-minlength="5"   ng-model="signupmodel.useremail" ng-value="isgoogleloginworking?signupmodel.useremail:'something else'"/>




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