Angular2: Find out if FormControl has required validator?

Question

does someone know a way to find out for an Angular2 FormControl if the required validor is registered for the control.

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Answer 1

While there is no Angular API to directly find if the required validator is set for a particular field, the roundabout way to achieve this is like as below:

import { NgForm, FormControl } from '@angular/forms';

const isRequiredControl = (formGroup: NgForm, controlName: string): boolean => {
    const { controls } = formGroup
    const control = controls[controlName]
    const { validator } = control
    if (validator) {
        const validation = validator(new FormControl())
        return validation !== null && validation.required === true
    }
    return false
}

I have tested this and this triggers only if the Validator.Required validator is added to the particular FormControl.