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Binding a combo box vaadin 8

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0

I'am trying to convert vaadin 7 code to vaadin 8 code Instead of using BeanFieldGroup vaadin 8 docs uses Binder instead to bind form fields to a class. This does not seem to work for combo box's.

I've looked for a way to use converter which does not seem to be available for combo box. As used in binding data to form in the vaadin documentation here

For one field the converter worked:

binder.forField(age).withConverter(
 new 
StringToIntegerConverter("Must enter a number")).bind(
 Student::getAge, 
Student::setAge);

But for a combo box I'am unsure how this will work.

ComboBox<String> gender = new ComboBox<String>("Gender");

Binder binder = new Binder<Student>(Student.class);

binder.bind(gender, Student::getGender, Student::setGender);

Which I know will not work is there a way to write a converter for a combo box or should another way be used altogether.

java vaadin8

share|improve this question

edited Mar 28 at 8:36

recurseuntilfor

asked Mar 28 at 4:09

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Which I know will not work - why not? looks good to me. Did you set items for the ComboBox? There should never be a need for a Converter on a ComboBox - You can always add an ItemLabelGenerator where you can define the conversion from the original type to how it should be displayed (default is toString, but you could convert it to Vaadin Components for example. see how it is done in the documentation)
  
  – Kaspar Scherrer
  Mar 28 at 8:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I got a error message The method bind(HasValue, ValueProvider, Setter) in the type Binder is not applicable for the arguments (ComboBox<String>, Student::getGender, Student::setGender) but when I tried to replicate the error no error was there. But using bindInstanceFields was easier though.
  
  – recurseuntilfor
  Mar 28 at 10:43
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  is gender actually an Enum or is it a String in your student object? using bindInstanceFields can be easier but IIRC then it only works for very basic bindings - no converters, validators, nullRepresentations, or readOnly (no setter) can be set, and you can't bind nested fields of the Student object. it basically applies binder.forField(field).bind("propertyName") for each HasValue-component in your view
  
  – Kaspar Scherrer
  Mar 28 at 10:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It is an Enum in a string utils with a toString method
  
  – recurseuntilfor
  Mar 28 at 10:53
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  aha! you should define your ComboBox as ComboBox<Gender> then!
  
  – Kaspar Scherrer
  Mar 28 at 10:55
  

  
  
  
  

 | 
show 1 more comment

0

I'am trying to convert vaadin 7 code to vaadin 8 code Instead of using BeanFieldGroup vaadin 8 docs uses Binder instead to bind form fields to a class. This does not seem to work for combo box's.

I've looked for a way to use converter which does not seem to be available for combo box. As used in binding data to form in the vaadin documentation here

For one field the converter worked:

binder.forField(age).withConverter(
 new 
StringToIntegerConverter("Must enter a number")).bind(
 Student::getAge, 
Student::setAge);

But for a combo box I'am unsure how this will work.

ComboBox<String> gender = new ComboBox<String>("Gender");

Binder binder = new Binder<Student>(Student.class);

binder.bind(gender, Student::getGender, Student::setGender);

Which I know will not work is there a way to write a converter for a combo box or should another way be used altogether.

java vaadin8

share|improve this question

edited Mar 28 at 8:36

recurseuntilfor

asked Mar 28 at 4:09

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Which I know will not work - why not? looks good to me. Did you set items for the ComboBox? There should never be a need for a Converter on a ComboBox - You can always add an ItemLabelGenerator where you can define the conversion from the original type to how it should be displayed (default is toString, but you could convert it to Vaadin Components for example. see how it is done in the documentation)
  
  – Kaspar Scherrer
  Mar 28 at 8:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I got a error message The method bind(HasValue, ValueProvider, Setter) in the type Binder is not applicable for the arguments (ComboBox<String>, Student::getGender, Student::setGender) but when I tried to replicate the error no error was there. But using bindInstanceFields was easier though.
  
  – recurseuntilfor
  Mar 28 at 10:43
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  is gender actually an Enum or is it a String in your student object? using bindInstanceFields can be easier but IIRC then it only works for very basic bindings - no converters, validators, nullRepresentations, or readOnly (no setter) can be set, and you can't bind nested fields of the Student object. it basically applies binder.forField(field).bind("propertyName") for each HasValue-component in your view
  
  – Kaspar Scherrer
  Mar 28 at 10:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It is an Enum in a string utils with a toString method
  
  – recurseuntilfor
  Mar 28 at 10:53
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  aha! you should define your ComboBox as ComboBox<Gender> then!
  
  – Kaspar Scherrer
  Mar 28 at 10:55
  

  
  
  
  

 | 
show 1 more comment

I'am trying to convert vaadin 7 code to vaadin 8 code Instead of using BeanFieldGroup vaadin 8 docs uses Binder instead to bind form fields to a class. This does not seem to work for combo box's.

I've looked for a way to use converter which does not seem to be available for combo box. As used in binding data to form in the vaadin documentation here

For one field the converter worked:

binder.forField(age).withConverter(
 new 
StringToIntegerConverter("Must enter a number")).bind(
 Student::getAge, 
Student::setAge);

But for a combo box I'am unsure how this will work.

ComboBox<String> gender = new ComboBox<String>("Gender");

Binder binder = new Binder<Student>(Student.class);

binder.bind(gender, Student::getGender, Student::setGender);

Which I know will not work is there a way to write a converter for a combo box or should another way be used altogether.

java vaadin8

share|improve this question

edited Mar 28 at 8:36

recurseuntilfor

asked Mar 28 at 4:09

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

binder.forField(age).withConverter(
 new 
StringToIntegerConverter("Must enter a number")).bind(
 Student::getAge, 
Student::setAge);

ComboBox<String> gender = new ComboBox<String>("Gender");

Binder binder = new Binder<Student>(Student.class);

binder.bind(gender, Student::getGender, Student::setGender);

share|improve this question

edited Mar 28 at 8:36

recurseuntilfor

asked Mar 28 at 4:09

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

share|improve this question

edited Mar 28 at 8:36

recurseuntilfor

asked Mar 28 at 4:09

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

asked Mar 28 at 4:09

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

asked Mar 28 at 4:09

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

2 Answers
2

active

oldest

votes

1

You mentioned in a comment that the gender field in your Student object is actually an Enum and not a String.

Your mistake was that you defined the ComboBox with type String instead of your Gender enum.

Assuming your gender enum class is called Gender, this will work:

ComboBox<Gender> gender = new ComboBox<Gender>("Gender");
Binder binder = new Binder<Student>(Student.class);
binder.bind(gender, Student::getGender, Student::setGender);

You can add an ItemLabelGenerator to the ComboBox to define how your Gender enum should be displayed. By default it will use toString() of the class. But you could use it to build Vaadin Components for example if you want. see how it is done in the documentation).

share|improve this answer

edited Mar 28 at 11:51

answered Mar 28 at 11:03

Kaspar ScherrerKaspar Scherrer

2,47211 gold badge88 silver badges2727 bronze badges

add a comment | 

0

I have found that in vaadin 8 uses bindInstanceFields to bind form data to a class.

Binder binder = new Binder<Student>(Student.class);

binder.bindInstanceFields(this);
binder.readBean(student);

share|improve this answer

answered Mar 28 at 8:32

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

add a comment | 

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1

You mentioned in a comment that the gender field in your Student object is actually an Enum and not a String.

Your mistake was that you defined the ComboBox with type String instead of your Gender enum.

Assuming your gender enum class is called Gender, this will work:

ComboBox<Gender> gender = new ComboBox<Gender>("Gender");
Binder binder = new Binder<Student>(Student.class);
binder.bind(gender, Student::getGender, Student::setGender);

You can add an ItemLabelGenerator to the ComboBox to define how your Gender enum should be displayed. By default it will use toString() of the class. But you could use it to build Vaadin Components for example if you want. see how it is done in the documentation).

share|improve this answer

edited Mar 28 at 11:51

answered Mar 28 at 11:03

Kaspar ScherrerKaspar Scherrer

2,47211 gold badge88 silver badges2727 bronze badges

add a comment | 

1

You mentioned in a comment that the gender field in your Student object is actually an Enum and not a String.

Your mistake was that you defined the ComboBox with type String instead of your Gender enum.

Assuming your gender enum class is called Gender, this will work:

ComboBox<Gender> gender = new ComboBox<Gender>("Gender");
Binder binder = new Binder<Student>(Student.class);
binder.bind(gender, Student::getGender, Student::setGender);

You can add an ItemLabelGenerator to the ComboBox to define how your Gender enum should be displayed. By default it will use toString() of the class. But you could use it to build Vaadin Components for example if you want. see how it is done in the documentation).

share|improve this answer

edited Mar 28 at 11:51

answered Mar 28 at 11:03

Kaspar ScherrerKaspar Scherrer

2,47211 gold badge88 silver badges2727 bronze badges

add a comment | 

You mentioned in a comment that the gender field in your Student object is actually an Enum and not a String.

Your mistake was that you defined the ComboBox with type String instead of your Gender enum.

Assuming your gender enum class is called Gender, this will work:

ComboBox<Gender> gender = new ComboBox<Gender>("Gender");
Binder binder = new Binder<Student>(Student.class);
binder.bind(gender, Student::getGender, Student::setGender);

You can add an ItemLabelGenerator to the ComboBox to define how your Gender enum should be displayed. By default it will use toString() of the class. But you could use it to build Vaadin Components for example if you want. see how it is done in the documentation).

share|improve this answer

edited Mar 28 at 11:51

answered Mar 28 at 11:03

Kaspar ScherrerKaspar Scherrer

2,47211 gold badge88 silver badges2727 bronze badges

ComboBox<Gender> gender = new ComboBox<Gender>("Gender");
Binder binder = new Binder<Student>(Student.class);
binder.bind(gender, Student::getGender, Student::setGender);

share|improve this answer

edited Mar 28 at 11:51

answered Mar 28 at 11:03

Kaspar ScherrerKaspar Scherrer

2,47211 gold badge88 silver badges2727 bronze badges

answered Mar 28 at 11:03

Kaspar ScherrerKaspar Scherrer

2,47211 gold badge88 silver badges2727 bronze badges

answered Mar 28 at 11:03

Kaspar ScherrerKaspar Scherrer

2,47211 gold badge88 silver badges2727 bronze badges

0

I have found that in vaadin 8 uses bindInstanceFields to bind form data to a class.

Binder binder = new Binder<Student>(Student.class);

binder.bindInstanceFields(this);
binder.readBean(student);

share|improve this answer

answered Mar 28 at 8:32

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

add a comment | 

0

I have found that in vaadin 8 uses bindInstanceFields to bind form data to a class.

Binder binder = new Binder<Student>(Student.class);

binder.bindInstanceFields(this);
binder.readBean(student);

share|improve this answer

answered Mar 28 at 8:32

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

add a comment | 

I have found that in vaadin 8 uses bindInstanceFields to bind form data to a class.

Binder binder = new Binder<Student>(Student.class);

binder.bindInstanceFields(this);
binder.readBean(student);

share|improve this answer

answered Mar 28 at 8:32

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

Binder binder = new Binder<Student>(Student.class);

binder.bindInstanceFields(this);
binder.readBean(student);

share|improve this answer

answered Mar 28 at 8:32

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

answered Mar 28 at 8:32

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges

answered Mar 28 at 8:32

recurseuntilforrecurseuntilfor

23733 silver badges88 bronze badges