Tips for verifying whether any control within a reactive form possesses a value in Angular 2

I am currently working on a form that consists of 4-5 different types of controls. In response to specific user actions, I need to determine if any of the controls contain a value at any point in the form's lifecycle, whether it is pristine or dirty. My approach cannot rely solely on the form states for this determination. Unfortunately, looping through the controls is not feasible due to 'this.myForm.controls' not being an array type. Additionally, despite having no values present, 'this.myForm.value' always returns an object.

Below is the code used to create the form:

this.searchForm = this.fb.group({
            'ids': this.fb.control([], multipleInputValidator(2)),
            'locationName': this.fb.control([], Validators.minLength(2)),
            'accountCodes': this.fb.control([], multipleInputValidator(2)),
            'regionCodes': this.fb.control([], multipleInputValidator(2)),
            'city': this.fb.control([], Validators.minLength(2)),
            'typeIds': this.fb.control([]),
            'centreIds': this.fb.control([]),
            'siteCodes': this.fb.control([]),
            'statusCode': this.fb.control([]),
            'from': this.fb.control([]),
            'to': this.fb.control([])
        });
angulartypescript

Answer №1

let isValuePresent = !!this.myForm.get('mycontrol').value;

Answer №2

If you're looking for a simple method to perform this validation, consider utilizing Object.keys().

Object.keys(this.searchForm.value).some(k => !!this.filterForm.value[k])

By using the above code snippet, you can evaluate the properties within the value object that signifies your form's current state and determine whether any of them contain a truthy value.

Answer №3

validateFormData() {
this.form.valueChanges
  .filter(() => this.form.valid)
  .map((value) => {
    for (let field in value) {
      if (value[field]) {
        switch (field) {
          case 'specificCase': //perform specific action
        }
      }
    }
  }).subscribe();

}

This method will iterate through a form group to validate the values of each control, allowing you to customize actions based on each valid value.

Hopefully this solution proves useful to you.

Answer №4

Here is a method that can help you check for valid values within nested forms.

verifyFormValidity(formGroup: UntypedFormGroup): boolean {
let hasValidValues = false;
Object.keys(formGroup.controls).forEach((field) => {
  const control = formGroup.get(field);
  if (control instanceof UntypedFormControl) {
    if (control.valid) {
      hasValidValues = true;
    }
  } else if (control instanceof UntypedFormGroup) {
    this.verifyFormValidity(control);
  }
});
return hasValidValues;

}

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