Adding new property in container at runtime

Vaadin 6 / 7 / 8 Framework Data Binding
1

Hi,

I have requiremnet to add new property into container at runtime.So is there anyway to achive same?I am using container.addContainerProperty() but it throwing an error.

2

Hi,

which container are you using and what is the exact error you’re getting? Some containers prohibit adding new properties for good reasons.

3

I am using BeanContainer and getting Access Denied Error.Following is My CustomTable and Bean.

class CustomTable extends Table
{
    BeanContainer<Long, MyBean> container;
    public CustomTable()
    {
        init();
    }
    public void init()
    {
        container=new BeanContainer<>(MyBean.class);
        container.setBeanIdProperty("id");
        
        for(int i=1;i<=5;i++)
        {
            container.addBean(new MyBean(i));
            
            for(int prop=1;prop<=24;prop++)
            {
                container.getItem(i).addItemProperty(prop,new ObjectProperty<>(new TextField(), TextField.class));
            }
        }
        
    }
}

and MyBean.java

class MyBean
    {
        long id;
        public MyBean(long id)
        {
            this.id=id;
        }
        public long getId() {
            return id;
        }
        public void setId(long id) {
            this.id = id;
        }
        
    }
4

You can’t use BeanContainers like that - the properties for those are taken from the beans directly. Since you’re using this for Table, could you just add your TextFields as generated columns to the Table?

5

It is also technically possible to add properties to a BeanContainer, but I would not recommend that approach unless you are deeply familiar with how BeanContainer, PropertySetItem, VaadinPropertyDescriptor etc. work and can use some semi-private APIs. This would involve defining custom implementations of VaadinPropertyDescriptor (if I remember the name correctly) and adding them to the container in a subclass using protected methods.

The approach of using a generated column is probably much simpler and safer, though, or a wrapper bean that adds accessors could be considered in some cases.

6

Thank you for giving reply of my question.

One thing i want ask you to Teppo/Henri suppose i am achive the same with generated columns but the problem is how to get values of generated columns?

I know that genertead columns are virtual columns and attached to a table.