Package org.apache.wicket.extensions.ajax.markup.html.autocomplete

Class AbstractAutoCompleteRenderer<T>

java.lang.Object

org.apache.wicket.extensions.ajax.markup.html.autocomplete.AbstractAutoCompleteRenderer<T>

Type Parameters:

T -

All Implemented Interfaces:

Serializable, IAutoCompleteRenderer<T>, IDetachable, IClusterable

Direct Known Subclasses:

AbstractAutoCompleteTextRenderer

public abstract class AbstractAutoCompleteRenderer<T>
extends Object
implements IAutoCompleteRenderer<T>

A renderer that abstracts auto-assist specific details and allows subclasses to only render the visual part of the assist instead of having to also render the necessary auto-assist javascript hooks.

Since:

1.2

Author:

Igor Vaynberg (ivaynberg)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
AbstractAutoCompleteRenderer()

Method Summary

Modifier and Type	Method	Description
protected CharSequence	getOnSelectJavaScriptExpression(T item)	Allows the execution of a custom javascript expression when an item is selected in the autocompleter popup (either by clicking on it or hitting enter on the current selection).
protected abstract String	getTextValue(T object)	Retrieves the text value that will be set on the textbox if this assist is selected
void	render(T object, Response response, String criteria)	Render the html fragment for the given completion object.
protected abstract void	renderChoice(T object, Response response, String criteria)	Render the visual portion of the assist.
void	renderFooter(Response response, int count)	Render the html footer fragment for the completion.
void	renderHeader(Response response)	Render the html header fragment for the completion.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.wicket.extensions.ajax.markup.html.autocomplete.IAutoCompleteRenderer

detach

Constructor Detail

AbstractAutoCompleteRenderer

public AbstractAutoCompleteRenderer()

Method Detail

render

public void render(T object,
                   Response response,
                   String criteria)

Description copied from interface: IAutoCompleteRenderer

Render the html fragment for the given completion object. Usually the html is written out by calling Response.write(CharSequence).

Specified by:

render in interface IAutoCompleteRenderer<T>

Parameters:

object - completion choice object

response - response object

criteria - text entered by user so far

renderHeader

public void renderHeader(Response response)

Description copied from interface: IAutoCompleteRenderer

Render the html header fragment for the completion. Usually the html is written out by calling Response.write(CharSequence).

Specified by:

renderHeader in interface IAutoCompleteRenderer<T>

renderFooter

public void renderFooter(Response response,
                         int count)

Description copied from interface: IAutoCompleteRenderer

Render the html footer fragment for the completion. Usually the html is written out by calling Response.write(CharSequence).

Specified by:

renderFooter in interface IAutoCompleteRenderer<T>

count - The number of choices rendered

renderChoice

protected abstract void renderChoice(T object,
                                     Response response,
                                     String criteria)

Render the visual portion of the assist. Usually the html representing the assist choice object is written out to the response use Response.write(CharSequence)

Parameters:

object - current assist choice

response -

criteria -

getTextValue

protected abstract String getTextValue(T object)

Retrieves the text value that will be set on the textbox if this assist is selected

Parameters:

object - assist choice object

Returns:

the text value that will be set on the textbox if this assist is selected

getOnSelectJavaScriptExpression

protected CharSequence getOnSelectJavaScriptExpression(T item)

Allows the execution of a custom javascript expression when an item is selected in the autocompleter popup (either by clicking on it or hitting enter on the current selection).

The javascript to execute must be a javascript expression that will be processed using javascript's eval(). The function should return the textvalue to copy it into the corresponding form input field (the default behavior). the current text value will be in variable 'input'. If the function returns null the chosen text value will be ignored.

example 1:

 protected CharSequence getOnSelectJavaScript(Address address)
 {
        final StringBuilder js = new StringBuilder();
        js.append("Wicket.DOM.get('street').value ='" + address.getStreet() + "';");
        js.append("Wicket.DOM.get('zipcode').value ='" + address.getZipCode() + "';");
        js.append("Wicket.DOM.get('city').value ='" + address.getCity() + "';");
        js.append("arguments[0]"); // <-- do not use return statement here!
        return js.toString();
 }
 

example 2:

 protected CharSequence getOnSelectJavaScript(Currency currency)
 {
        final StringBuilder js = new StringBuilder();
        js.append("val rate = ajaxGetExchangeRateForCurrency(currencySymbol);");
        js.append("if(rate == null) alert('exchange rate service currently not available');");
        js.append("rate");
        return js.toString();
 }
 

Then the autocompleter popup will be closed.

Parameters:

item - the autocomplete item to get a custom javascript expression for

Returns:

javascript to execute on selection or null if default behavior is intented