How to call function on input text change in angular 2

Question

I want to call the type script function on input change of text box, and its working for me. But it call on every change, I want to call when the minimum number of character in the text box are 5.

export class StudentMaintenanceComponent implements OnInit {
    @Component({
        selector: 'app-student-management',
        template: `<input placeholder="" class="form-control" type="text" [maxlength]="5" (input)="SearchData($event.target.value)">`,
        styleUrls: ['./app-student-management.css']
    })

    SearchData(_no: string) { // should be called when minimum no of character are 5 in the text field.
        console.log(_no);
    }
}

You can look at stackoverflow.com/questions/45096161/…. I think this is the same problem. — Sven
– Sven, Commented Jan 3, 2018 at 20:40

Arshmeet · Accepted Answer · 2018-01-04 05:07:28Z

12

You can write something like this

(input)="$event.target.value.length > 5 && SearchData($event.target.value)"

You can also use template reference variable like this

<input placeholder="" #textInput class="form-control" type="text" [maxlength]="5" (input)="textInput.value.length > 5 && SearchData(textInput.value)">

answered Jan 4, 2018 at 5:07

Arshmeet

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