w3bdesign / Statens-Vegvesen

  /**

   * Check if the entered text is either in the format "XX12345", is not undefined and length is 7

   * @param {Event} event Used to fetch the value from the text input

   */

  public checkValidText(event: Event) {

    // Need to cast this to <HTMLInputElement> or Typescript gives us an error

    const bilInformasjon = (<HTMLInputElement>event.target).value;

    const submitButton = window.document.getElementById('submitButton');

    const letters = /[A-Z]{2}[0-9]{5}/gi;

    if (

      bilInformasjon.match(letters) &&

      bilInformasjon !== undefined &&

      bilInformasjon.length === 7

    ) {

      submitButton!.removeAttribute('disabled');

    } else {

      submitButton!.setAttribute('disabled', 'true');