Get name of Form Control

reactive form get form control name
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angular reactive form get control name

I'm working with reactive forms in angular, I need to compare the start date "start date" with the end date "end date", both controls are validated in the "dateLessThan" function, but the problem is that I do not know how to ask for control is evaluating

//Some stuff
public fechaInicio = new FormControl('', [
    Validators.required    
    , this.dateLessThanTo

]);
public fechaFin = new FormControl('', [
    Validators.required     
    , this.dateLessThan
]);



 createForm() {
    this.contratoForm = this.formBuilder.group({    
        fechas: this.formBuilder.group({
            fechaInicio: this.fechaInicio,
            fechaFin: this.fechaFin
        }, { validator: this.dateLessThan('fechaInicio', 'fechaFin') }),          

    });
}

Here I Need to know the name of control for compare dates:

 dateLessThanTo(fieldControl: FormControl) {
    //
    //if (fechaInicio.value > FechaFin.value){
    //      return true;
    //}
    //else{
    //  return false;
    //  }

}

//Some stuff

In your custom validator, you get the formGroup fechas, so you do not need to pass any parameters from the TS code:

 createForm() {
    this.contratoForm = this.formBuilder.group({    
        fechas: this.formBuilder.group({
            fechaInicio: this.fechaInicio,
            fechaFin: this.fechaFin
        }, { validator: this.dateLessThanTo }),          

    });
}

and in your custom validator:

dateLessThanTo(group: FormGroup) {
   if (group.controls.fechaInicio.value > group.controls.fechaFin.value){
     return {notValid: true}
   }
   return null;
}

You need to return null when valid, and set an error, e.g notValid when it's not.

How to get name of input field from Angular2 FormControl object , To expand on Radim K�hler answer. here is a shorter way of writing that function. getControlName(c: AbstractControl): string | null { const� When you create a Form Controls list box (or any other control from the Form Controls section of the Insert dropdown), its name is displayed in the name box on the left hand side of the formula bar. You can change the name there: delete the old name, type a new one and press Enter.


Get the parent group from the control and then compare to the current control:

  dateLessThanTo(control: AbstractControl) { 
    let name = this.getName(control);

    ...
  }

  private getName(control: AbstractControl): string | null {
    let group = <FormGroup>control.parent;

    if (!group) {
      return null;
    }

    let name: string;

    Object.keys(group.controls).forEach(key => {
      let childControl = group.get(key);

      if (childControl !== control) {
        return;
      }

      name = key;
    });

    return name;
  }

FormControlName, Tracks the name of the FormControl bound to the directive. minLength(2)), last: new FormControl('Drew'), }); get first(): any { return this.form.get('first'); }� content_copy const control = new FormControl ('', {updateOn: 'submit'}); Reset the control back to an initial valuelink. You reset to a specific form state by passing through a standalone value or a form state object that contains both a value and a disabled state (these are the only two properties that cannot be calculated).


in your component you can add a custom validator like this one

static customValidator(control: AbstractControl): { [key: string]: any } {
const controlName = (Object.keys(control.parent.controls).find(key => control.parent.controls[key] === control));
if (control.value === 0) {
  return {key: {error: 'invalid'}};
}
return null; }

in controlName you will have the name of your control.

FormControl, Tracks the value and validation status of an individual form control. void get( path: string | (string | number)[]): AbstractControl | null getError(errorCode: string, � If the EIN was requested via Form SS-4, the name control should be derived as follows: For estates, the name control should be derived from the first four characters of the last name of the decedent. For trusts when an individual is listed, the name control should be derived from the first four characters of the last name of the individual.


You can do that with:

Object.getOwnPropertyNames(this.contratoForm['controls']['fechas']['controls']).map((key: string) => { 
// Something like this. Not sure how your form looks like

Get name of Form Control - angular - html, Get name of Form Control - angular. private getName(control: AbstractControl): string | null { let group = <FormGroup>control.parent; if (!group) { return null; }� Controls. expression A variable that represents a Form object. Remarks. Use the Controls property to refer to one of the controls on a form, subform, report, or section within or attached to another control. For example, the first code syntax returns the number of controls located on Form1. The second references the name of a property within a


you just have to do like this , You can inspect an individual FormControl within a form by extracting it with the .get() method.

contratoForm.get('fechaInicio').value 


 dateLessThanTo(fieldControl: FormControl) {
   let va= fieldControl.get('fechaInicio').value ;
   let va1 = fieldControl.get('FechaFin').value ; 
}

check here : https://angular.io/guide/reactive-forms#inspect-formcontrol-properties

How to get name of input field from Angular2 FormControl - html, I can't find any method or public property on FormControl that exposes the input field's name. It's simple enough to see its value, of course. The following shows� If you did not use a business name and instead used your individual name, your name control will be the first four letters of your last name. For example, John Q. Public applied for an EIN using John Q. Public and did not use a business name. The name control assigned would be PUBL.


How to manage reactive form controls with form groups in Angular 8 , We explain how you can divide form controls by form groups in Every single form control in the form group is identified by name when initializing. When you save and run the application, if you do get any errors, read the� A1. A name control is a sequence of characters derived from a taxpayer’s name that is used by IRS in processing the tax return filed by the taxpayer. It is important that the combination of name control and taxpayer identification number (TIN) provided on an electronically filed return match IRS’s record of name controls and TINs. Using the Correct Name Control in e-filing Corporate Tax Returns | Internal Revenue Service.


Angular FormControl Example, FormControl: It is a class that is used to get and set values and validation of Name: <input [formControl]="name"> <label *ngIf="name.invalid"� Coercive control is a strategic form of ongoing oppression and terrorism used to instill fear. The abuser will use tactics, such as limiting access to money or monitoring all communication, as a


Understanding Angular Reactive Forms | by Leonardo Giroto, A Form Control is a class which holds the value and validation status of each const inputtedName = formGroup.get('name').value;const� public IEnumerable<Control> GetAll(Control control,Type type) { var controls = control.Controls.Cast<Control> (); return controls.SelectMany(ctrl => GetAll(ctrl,type)) .Concat(controls) .Where(c => c.GetType() == type); } To test it in the form load event I wanted a count of all controls inside the initial GroupBox.