net.sf.click.control
Class Option

java.lang.Object
  net.sf.click.control.Option

All Implemented Interfaces:

Serializable

public class Option

extends Object

implements Serializable

Provides a select Option element: <option></option>.

The Option class uses an immutable design so Option instances can be shared by multiple Pages in the multi-threaded Servlet environment. This enables Option instances to be cached as static variables.

Option Example

The example below caches Option and OptionGroup instances in a static List to provide a reusable InvestmentSelect control.

 public class InvestmentSelect extends Select {

     private static final List INVESTMENT_OPTIONS = new ArrayList();

     static {
         OptionGroup property = new OptionGroup("Property");
         property.add(new Option("Commerical Property", "Commercial"));
         property.add(new Option("Residential Property", "Residential"));
         INVESTMENT_OPTIONS.add(property);

         OptionGroup securities = new OptionGroup("Securities");
         securities.add(new Option("Bonds"));
         securities.add(new Option("Options"));
         securities.add(new Option("Stocks"));
         INVESTMENT_OPTIONS.add(securities);
     }

     public InvestmentSelect(String label) {
         super(label);
         setOptionList(INVESTMENT_OPTIONS);
     }
 }

 public class InvestmentsPage extends Page {

     public Form form = new Form();

     private Select investmentsSelect = new InvestmentsSelect("investments");;

     public InvestmentsPage() {
         investmentsSelect.setMutliple(true);
         investmentsSelect(7);
         form.add(investmentsSelect);

         form.add(new Submit("ok", "  OK  "));
     }

     ..
 } 

Rendered HTML:

Investments	CommercialResidentialBondsOptionsStocks

See also the W3C HTML reference: OPTION

Author:

Malcolm Edgar

See Also:

Select, OptionGroup, Serialized Form

Field Summary

static Option	EMPTY_OPTION The empty select empty option.
protected String	label The Options display label.
protected String	value The Option value.

Constructor Summary

Option(Object value, String label)
Create an Option with the given value and display label.

Option(String value)
Create an Option with the given value.

Method Summary

String	getLabel() Return the Option display label.
String	getTag() Return the Options's html tag: option.
String	getValue() Return the Option value.
void	render(Select select, HtmlStringBuffer buffer) Return a HTML rendered Option string.
String	renderHTML(Select select) Deprecated. use render(net.sf.click.control.Select, net.sf.click.util.HtmlStringBuffer) instead

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

EMPTY_OPTION

public static final Option EMPTY_OPTION

The empty select empty option.

label

protected final String label

The Options display label.

value

protected final String value

The Option value.

Constructor Detail

Option

public Option(Object value,
              String label)

Create an Option with the given value and display label.

Note: the specified value will be converted to a String.

Parameters:

value - the Option value

label - the Option display label

Option

public Option(String value)

Create an Option with the given value. The value will also be used for the display label.

Parameters:

value - the Option value and display label

Method Detail

getTag

public String getTag()

Return the Options's html tag: option.

Returns:

the Option's html tag

getLabel

public String getLabel()

Return the Option display label.

Returns:

the Option display label

getValue

public String getValue()

Return the Option value.

Returns:

the Option value

render

public void render(Select select,
                   HtmlStringBuffer buffer)

Return a HTML rendered Option string.

Parameters:

select - the parent Select

buffer - the specified buffer to render to

renderHTML

public String renderHTML(Select select)

Deprecated. use render(net.sf.click.control.Select, net.sf.click.util.HtmlStringBuffer) instead

Return a HTML rendered Option string.

Parameters:

select - the parent Select

Returns:

rendered HTML Option string