The XdevComboBox is a combination of an input field, a button, and a drop-down list, from which the user can select a value. The drop-down list predominantly contains the values contained in a given column in the database table.

The input field of an XdevComboBox is editable by default. The drop-down list entries are automatically re-filtered in accordance with each input. The selected entry is displayed in the XdevComboBox. The XdevComboBox is a form component and can be persisted via the XdevFieldGroup.

Important properties:

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• ReadOnly 
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Important events:

Data binding:

• Data container (model)

  • XdevBeanItemContainer - Standard data container. The allocation is set using the setContainerDataSource method.

    // Generates a new XdevBeanItemContainer 'productList' XdevBeanItemContainer<Product> productList = new XdevBeanItemContainer<Product>(Product.class);   // Sets the XdevBeanItemContainer comboBox.setContainerDataSource(productList);

    
    

  • XdevLazyEntityContainer - RapidClipse exclusively uses this when the property Entity > Auto query data is selected.

Examples:

• Add entries - Manually add entries to the XdevComboBox.

  comboBox.addItem("Eintrag 1"); comboBox.addItem("Eintrag 2");

  Direct allocation of multiple entries.

  listSelect.addItems("Eintrag 1", "Eintrag 2", "Eintrag 3", "Eintrag 4");

  
  

• Selected object - Returns the selected object (entity) - Example: category entity.

  Category Category = comboBox.getSelectedItem();

  or

  Category Category = (Category)comboBox.getValue();

  
  

• Remove elements - Removes all the elements from the XdevComboBox.

  comboBox.removeAllItems();

  
  

• Select element - Automatic selection of an entry - Example: first entry.

  Collection<?> itemIds = comboBox.getItemIds(); comboBox.setValue(((List<Category>)itemIds).get(0));

  
  

• Reset selection - Sets the selection to the initial state. This triggers a valueChange event.

  comboBox.clear();

  
  

• Read random value of the selected object - Example: "Category name"

  String categoryName = comboBox.getSelectedItem().getBean().getCategoryname();

  
  

• Read XdevComboBox data - Generates a new XdevBeanContainer productContainer of Product category and assigns this with the getContainerDataSource method to XdevBeanContainer of the XdevComboBox.

  XdevBeanContainer<Product> productContainer = comboBox.getContainerDataSource();

  
  

All XdevComboBox Methods 

Note:

• XdevComboBox > Properties > FilteringMode > null leads to error.