Reactive Forms - mark fields as touched

Question

I am having trouble finding out how to mark all form\'s fields as touched. The main problem is that if I do not touch fields and try to submit form - validation error in not

Answer 1

A solution without recursion

For those worried about performance, I've come up with a solution that doesn't use recursion, although it still iterates over all controls in all levels.

 /**
  * Iterates over a FormGroup or FormArray and mark all controls as
  * touched, including its children.
  *
  * @param {(FormGroup | FormArray)} rootControl - Root form
  * group or form array
  * @param {boolean} [visitChildren=true] - Specify whether it should
  * iterate over nested controls
  */
  public markControlsAsTouched(rootControl: FormGroup | FormArray,
    visitChildren: boolean = true) {

    let stack: (FormGroup | FormArray)[] = [];

    // Stack the root FormGroup or FormArray
    if (rootControl &&
      (rootControl instanceof FormGroup || rootControl instanceof FormArray)) {
      stack.push(rootControl);
    }

    while (stack.length > 0) {
      let currentControl = stack.pop();
      (Object).values(currentControl.controls).forEach((control) => {
        // If there are nested forms or formArrays, stack them to visit later
        if (visitChildren &&
            (control instanceof FormGroup || control instanceof FormArray)
           ) {
           stack.push(control);
        } else {
           control.markAsTouched();
        }
      });
    }
  }

This solution works form both FormGroup and also FormArray.

You can play around with it here: angular-mark-as-touched