Angular 2: How do validate placeholder based on boolean condition

Question

I have one textbox and initially it would be displaying some placeholder

<textarea class="some class" placeholder={{Some placeholder from REST API}}><textarea>

I want to disable this placeholder based on some boolean condition?

Answer 1

<textarea [placeholder]="condition ? 'haha' : ''"></textarea>

If the placeholder from API is contained in variable, say: "apiPlaceHol" Then use it like this:

<textarea [placeholder]="condition ? apiPlaceHol : ''"></textarea>