I am trying to use sitecore forms with Jss angular app, I find this on github and trying to use it in my app https://github.com/bic742/sitecore-jss-angular-forms

the form is rendered successfull. but when I click submit button, i got this error. enter image description here

I checked the network tab and I find that all parameters passed successfully. enter image description here

this is the code of from.ts

import { FormBuilder, FormGroup } from "@angular/forms";
import {
} from '@sitecore-jss/sitecore-jss-forms';
import { FieldTypes } from '../forms/FieldTypes';
import { ComponentRendering } from '@sitecore-jss/sitecore-jss-angular';
import { DynamicFieldDirective } from '../forms/directives/dynamic-field/dynamic-field.directive';
import { environment } from '../../../environments/environment';
import { FieldState, FormStateService, FieldStateCollection } from '../forms/services/form-state.service';

export interface ErrorComponentProps {
  form: SitecoreForm;
  formErrors: string[];
  fieldErrors: Array<{ fieldName: string, state: FieldState }>;

export interface FormProps {
  form: SitecoreForm;
  sitecoreApiHost: string;
  sitecoreApiKey: string;
  onRedirect?: (url: string) => void;
  /** Fetch function used when submitting the form (defaults to using `fetch`) */
  formFetcher?: FormFetcher;

  /** Fetch function used when posting form field tracking data (defaults to using `fetch`) */
  trackerFetcher?: TrackerFetcher;

  selector: 'app-form',
  templateUrl: './form.component.html',
  styleUrls: ['./form.component.scss']

export class FormComponent implements FormProps {
  @ViewChild(DynamicFieldDirective, { static: true}) field: DynamicFieldDirective;
  @Input() public rendering: ComponentRendering;

  private _tracker: FormTracker;
  public trackerFetcher: TrackerFetcher;
  public formFetcher: FormFetcher;

  public formGroup: FormGroup;

  get value() {
    return this.formGroup.value;

  public form: SitecoreForm;
  public formErrors: string[];
  public sitecoreApiHost = environment.sitecoreApiHost;
  public sitecoreApiKey = environment.sitecoreApiKey;
  public action: string;

  public constructor(private formBuilder: FormBuilder, private formState: FormStateService) { 
    const state = {
      errors: [],
      // in a multistep form the server can reset the form schema
      // to display further steps; this state property overrides
      // the form passed in from props if present
      nextForm: null,
      submitButton: null


    this._tracker = new FormTracker({
      endpoint: `${this.sitecoreApiHost}/api/jss/fieldtracking/register?sc_apikey=${this.sitecoreApiKey}`,
      fetcher: this.trackerFetcher,

  public ngOnInit(): void { 
    this.form = this.formState.state.nextForm || this.rendering.fields as unknown as SitecoreForm;
    this.formGroup = this.createControl();

    this._tracker.setFormData(this.form.formItemId.value, this.form.formSessionId.value, this.form.metadata.isTrackingEnabled);

    this.action = `${this.sitecoreApiHost}/api/jss/formbuilder?fxb.FormItemId=${this.form.metadata.itemId}&fxb.HtmlPrefix=${this.form.htmlPrefix}&sc_apikey=${this.sitecoreApiKey}`;

  createControl() {
    const group = this.formBuilder.group({});
    this.form.fields.forEach(field => {
      if (field.model.fieldTypeItemId === FieldTypes.Button) return;

      const castField = field as ValueFormField;

      if (castField.valueField) {
        const control = this.formBuilder.control(castField.valueField.name);
        group.addControl(castField.valueField.name, control);

    return group;

  collectCurrentFieldValues() {
    return Object.keys(this.formState.state)
      .filter((fieldName) => this.formState.state[fieldName] && typeof this.formState.state[fieldName].isValid !== 'undefined')
      .map((fieldName) => ({ fieldName: fieldName, state: this.formState.state[fieldName] as FieldState }));

   * Handler triggered when the form is submitted. May transition its state between
   * steps in a multistep form or handle a final submit.
  onSubmit(e) {

    const form = this.formState.state.nextForm || this.form;

    const fieldValues: { [key: string]: string | string[] | boolean } = {};

    const currentFieldValues = this.collectCurrentFieldValues();

    currentFieldValues.forEach(field => {
      if (typeof field.state.value !== 'undefined') {
        fieldValues[field.fieldName] = field.state.value;

    // NOTE: we're not pre-validating the submit on the client because
    // Sitecore won't be able to track validation errors in xConnect

    // serialize the form data that we got from the server
    // (hidden fields with constant values, unchanged default field values, etc)
    const formData = serializeForm(form, { submitButtonName: this.formState.state.submitButton });
    // merge in user-updated field values

    const submitUrl = (e.target as HTMLFormElement).action;
    if (!submitUrl) {
      throw new Error('Submit URL was not defined. Ensure the form has an action attribute.');

    submitForm(formData, submitUrl)
      .then((result) => {
        this.form = result.nextForm;

        if (result.success && result.redirectUrl) {
          // Process redirect-on-success action.
          // if (this.props.onRedirect) {
          //   this.props.onRedirect(result.redirectUrl);
          // } else {
            window.location.href = result.redirectUrl;

        if (result.validationErrors) {
          this.formErrors = [];
          Object.keys(result.validationErrors).forEach((fieldKey) => {
            this.formErrors = this.formErrors.concat(result.validationErrors[fieldKey]);

          const stateUpdate: FieldStateCollection = {};

          Object.keys(result.validationErrors).forEach((fieldKey) => {
            stateUpdate[fieldKey] = {
              value: (this.formState.state[fieldKey] || {}).value,
              isValid: false,
              errors: result.validationErrors[fieldKey],


        if (result.nextForm) {
          this.formState.setState({ nextForm: result.nextForm });

        if (result.success) {

        if (result.errors && result.errors.length > 0) {
          throw result.errors;

        this.formState.setState({ errors: [] });
      .catch((error: Error | string[] | string) => {
        console.log('Form submit error', error);

        if (Array.isArray(error)) {
          this.formState.setState({ errors: error });
        } else if (typeof error === 'string') {
          console.log('Form submit error', error);
          this.formState.setState({ errors: [error] });
        } else {
          console.log('Form submit error', error);
          this.formState.setState({ errors: [error.message] });

any one have an idea about this?

  • Any updates for the above issue. I am also facing the same issue while using the angular jss form.
    – vijayan M
    Nov 10, 2021 at 6:51

1 Answer 1


It's been a while (time, Sitecore versions, ...) since this has been posted. Did you manage to solve this?

I faced a similar (same?) issue with a NextJS / React implementation (Sitecore 10.2 - Sitecore Headless 20.0.3). My Sitecore logs showed following details:

1000 09:39:31 ERROR Application error.
Exception: System.NullReferenceException
Message: Object reference not set to an instance of an object.
Source: Sitecore.JavaScriptServices.Forms
   at Sitecore.JavaScriptServices.Forms.Controllers.JsonFormBuilderController.GetNextForm(String id, String contextItemId, NavigationType navigationType, String[] submitErrors)
   at Sitecore.JavaScriptServices.Forms.Controllers.JsonFormBuilderController.GetSubmitActionResult(FormSubmitContext submitContext, String contextItemId)

The issue here is that Sitecore is missing the ItemId.

The react sample implementation (https://github.com/Sitecore/jss/blob/39f4267e8cd3c942910029d2e186058c1ab105bc/packages/sitecore-jss-react-forms/src/components/form.tsx#L99) passes this a query string parameter

const action = `${this.props.sitecoreApiHost}/api/jss/formbuilder?...sc_itemid=${form.contextItemId}`;

but this doesn't work for my setup (assuming SC bug, to be investigated): Sitecore item resolver kicks in, preventing the call to reach the api/jss/formbuilder route.

Long story short: I managed to solve this by including sc_itemid in the FormData payload (adding it to formdata right before fetching, but you could render it as a hidden field as well I guess).

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