I am pretty new with Angular 4 and I have probably basic question for someone who is a bit more experienced than me.

I have input field which value needs to be populated when object user exists. So basically I need php function isset() in angular 4.

I tried like this but it is not working.

<input class="form-control" type="text"  value="{{ !!user.firstname ? user.firstname : null }}" id="firstname">

Any help would be appreciated.

Tnx

I am pretty new with Angular 4 and I have probably basic question for someone who is a bit more experienced than me.

I have input field which value needs to be populated when object user exists. So basically I need php function isset() in angular 4.

I tried like this but it is not working.

<input class="form-control" type="text"  value="{{ !!user.firstname ? user.firstname : null }}" id="firstname">

Any help would be appreciated.

Tnx

• javascript
• html
• angular

Share Improve this question Follow asked Oct 20, 2017 at 10:22 dj.milojevicdj.milojevic 21411 gold badge55 silver badges1212 bronze badges 1

• 1 use [(ngModel)] instead of value – Shubham Agrawal Commented Oct 20, 2017 at 10:26

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2 Answers 2

Sorted by: Reset to default 3

You should use [(ngModel)] with input and use elvis operator to check if the user exists or use *ngIf

<input class="form-control" type="text"  [(ngModel)]=user?.firstName id="firstname">

Try this :

<input class="form-control" type="text" [value]="user.firstname ? user.firstname : null"  name="firstname" id="firstname">