Dfyjkt

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()));