Agfdhyk

I work with Vaadin. I have a text field and a button. My button is initially disabled. When my text field is filled with valid data my button must activate. I can not activate my button. Could you help me ? Thank you

public static DynTextField createFromElement(Element elt, DynForm form) {

    if (elt.getNodeName().equals("param") && elt.getAttribute("type").equals("TEXT")) {

        DynTextField dtf = new DynTextField();

        dtf.setForm(form);

        if (elt.hasAttribute("texte"))

            dtf.setCaption(elt.getAttribute("texte"));

        dtf.nom = elt.getAttribute("nom");

        if (elt.hasAttribute("FORMAT"))

            dtf.setFormat(elt.getAttribute("FORMAT"));

        dtf.setDescription(elt.getAttribute("description"));

        dtf.setStyleName("param" + (elt.hasAttribute("class") ? elt.getAttribute("class") : ""));

        return dtf;

    } else

        return null;

}



private void setFormat(String attribute) {

    binder = new Binder<>();

    binder.forField(this).withValidator(new RegexpValidator("Saisie obligatoire !!", attribute)).asRequired("Format Erroné").bind(No.getter(), No.setter());

    //new Binder<>().forField(this).withValidator(new RegexpValidator(attribute, "Format Erroné")).asRequired();



}



// convenience empty getter and setter implementation for better readability 

public static class No { 

 public static <SOURCE, TARGET> ValueProvider<SOURCE, TARGET> getter() { 

  return source -> null; 

 } 



 public static <BEAN, FIELDVALUE> Setter<BEAN, FIELDVALUE> setter() { 

  return (bean, fieldValue) -> { 

   //no op 

  }; 

 } 

}   

The program that creates my button. This is where I would like to make my button active.

public DynButton(DynForm form, String as400PGMName, String parameterList) {

    super(VaadinIcons.CHECK);

    this.as400PGMName = as400PGMName;

    if (parameterList.length == 1 && parameterList[0].equals(""))

        this.parameterList = new String {};

    else

        this.parameterList = parameterList;

    this.form = form;

    addClickListener(event -> {

        fireClickEvent(event);

    });



    addClickListener(this);

    impl = new DynComponentImpl();



     //boutton initially disable

     this.setEnabled(isActif());





}

You can do it with a listener on either the text field or the binder

textField.addValueChangeListener(e -> 

        myButton.setEnabled(!e.getValue().equals("")));

or

binder.addStatusChangeListener(e -> 

        myButton.setEnabled(!e.hasValidationErrors()));