angular material 15 input status empty and has value

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How can I set classes to check if input or date range picker has value or not.

Also, the placeholder in date picker not showing until the focus.

How can I fix that without adding extra TS code?

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Zsolt Balint On

You could do it like this:

<input [(ngModel)]="inputValue" [ngClass]="{'error': !inputValue}">