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Apache Wicket Interview Questions and Answers

Ques 16. How to create single selected ListBox?

// single list choice

private static final List<String> FRUITS = Arrays.asList(new String[] { "Apple", "Orange", "Banana" });

ListChoice<String> listFruits = new ListChoice<String>("fruit", new PropertyModel<String>(this, "selectedFruit"), FRUITS);

listFruits.setMaxRows(5);

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Ques 17. How to create multiple selected ListBox in apache-wicket?

//choices in list box

private static final List<String> NUMBERS = Arrays.asList(new String[] {"Number 1", "Number 2", "Number 3", "Number 4", "Number 5", "Number 6" });

//variable to hold the selected multiple values from listbox,

//and make "Number 6" selected as default value

private ArrayList<String> selectedNumber = new ArrayList<String>(

Arrays.asList(new String[] { "Number 6" }));

ListMultipleChoice<String> listNumbers = new ListMultipleChoice<String>(

"number", new Model(selectedNumber), NUMBERS);

//HTML for multiple select listbox

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Ques 18. How to create DropDown Choice in apache-wicket?

//Java

import org.apache.wicket.markup.html.form.DropDownChoice;

...

//choices in dropdown box

private static final List<String> SEARCH_ENGINES = Arrays.asList(new String[] {

"Google", "Bing", "Baidu" });

//variable to hold the selected value from dropdown box,

//and also make "Google" is selected by default

private String selected = "Google";

DropDownChoice<String> listSites = new DropDownChoice<String>(

"sites", new PropertyModel<String>(this, "selected"), SEARCH_ENGINES);

//HTML for dropdown box

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Ques 19. How to create FileUpload field in apache-wicket?

//Java

import org.apache.wicket.markup.html.form.upload.FileUploadField;

form.setMultiPart(true);

form.add(fileUpload = new FileUploadField("fileUpload"));

//HTML

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Ques 20. How to create Select Option as menu wise in apache-wicket?

//Java

import org.apache.wicket.extensions.markup.html.form.select.Select;

import org.apache.wicket.extensions.markup.html.form.select.SelectOption;

...

//variable to hold the selected value from dropdown box,

//and also make "jQuery" selected by default

private String selected = "jQuery";

Select languages = new Select("languages", new PropertyModel<String>(this, "selected"));

form.add(languages);

languages.add(new SelectOption<String>("framework1", new Model<String>("Wicket")));

languages.add(new SelectOption<String>("framework2", new Model<String>("Spring MVC")));

languages.add(new SelectOption<String>("framework3", new Model<String>("JSF 2.0")));

languages.add(new SelectOption<String>("Script1", new Model<String>("jQuery")));

languages.add(new SelectOption<String>("Script2", new Model<String>("prototype")));

//HTML for dropdown box

<option wicket:id="framework1" >Wicket (1.4.7)</option>

<option wicket:id="framework2" >Spring MVC (3.0)</option>

</optgroup>

<option wicket:id="Script1" >jQuery (1.6.1)</option>

<option wicket:id="Script2" >prototype (1.7)</option>

</optgroup>

</select>

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