ag88/DataListPanel.html

## readme.md

      
    Raw
  

              readme.md
            
          
    An Apache Wicket reusable Data List

This component displays a list of JavaBeans as a html table
DataListPanel takes as input in the constructor :

the wicket:id of the component
itemclass The java class of the JavaBean
List items the list of JavaBeans


## DataListPanel.html
<html xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd">
<body>
<wicket:panel>
    <table id="dataitems" class="table table-striped">
    	<thead class="table-secondary">
    		<th class="col-md-1" wicket:id="hdrRepeater"></th>
    	</thead>
    	<tbody>
    		<wicket:container wicket:id="dataRepeater"></wicket:container>
    	</tbody>
    </table>
</wicket:panel>
</body>
</html>

## DataListPanel.java
package com.mywicket.component;

import java.beans.BeanDescriptor;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.util.Enumeration;
import java.util.List;

import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.markup.repeater.RepeatingView;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;

public class DataListPanel<T extends Serializable> extends Panel {

	Logger log = LoggerFactory.getLogger(DataListPanel.class);

	List<T> items;
	Class<T> itemclass;

	public DataListPanel(String id, Class<T> itemclass, List<T> items) {
		super(id);
		this.items = items;
		this.itemclass = itemclass;
		init();
	}

	protected void init() {
    	Marker marker = MarkerFactory.getMarker("init()");

    	try {
			BeanInfo beaninfo = Introspector.getBeanInfo(itemclass);
			PropertyDescriptor[] propdesc = beaninfo.getPropertyDescriptors();
			RepeatingView hdrItems = new RepeatingView("hdrRepeater");
			for(PropertyDescriptor pd : propdesc) {
				log.debug(marker, "{}", pd.getName());
				hdrItems.add(new Label(hdrItems.newChildId(), pd.getName()));
			}
			add(hdrItems);

			RepeatingView dataRows = new RepeatingView("dataRepeater");
			for(T item : items) {
				dataRows.add(new DataRowPanel<T>(dataRows.newChildId(), new Model<T>(item), itemclass));
			}
			add(dataRows);

		} catch (IntrospectionException e) {
			log.error(marker, e.getMessage());
		}

	}

	private static final long serialVersionUID = 773465778036471818L;
}


## DataRowPanel.html
<html xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd">
<body>
<wicket:panel>
	<tr>
		<td wicket:id="dataField" class="col-md-1"></td>
	</tr>
</wicket:panel>
</body>
</html>

## DataRowPanel.java
package com.mywicket.component;

import java.beans.BeanDescriptor;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;

import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.markup.repeater.RepeatingView;
import org.apache.wicket.model.IModel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;


public class DataRowPanel<T> extends Panel {

	Logger log = LoggerFactory.getLogger(DataRowPanel.class);

	Class<T> itemclass;

	public DataRowPanel(String id, IModel<T> model, Class<T> itemclass) {
		super(id, model);
		this.itemclass = itemclass;
		init();
	}

	protected void init() {
    	Marker marker = MarkerFactory.getMarker("init()");
    	T bean = (T) getDefaultModelObject();

    	try {
			BeanInfo beaninfo = Introspector.getBeanInfo(itemclass);
			PropertyDescriptor[] propdesc = beaninfo.getPropertyDescriptors();

			RepeatingView fields = new RepeatingView("dataField");
			for(PropertyDescriptor pd: propdesc) {
				try {
					Object o = pd.getReadMethod().invoke(bean);
					if(o != null)
						fields.add(new Label(fields.newChildId(),o.toString()));
					else
						fields.add(new Label(fields.newChildId(), ""));
				} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
					log.error(marker, e.getMessage());
				}
			}
			add(fields);

		} catch (IntrospectionException e) {
			log.error(marker, e.getMessage());
		}
	}

	private static final long serialVersionUID = 773465778036471818L;
}


## Example.html
<!DOCTYPE html>
<html xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd">
<head>
	<meta charset="utf-8" />
	<title>Person List example</title>
</head>
<body>
    <h2>Persons</h2>
	<p>
	<div wicket:id="dataPanel"></div>

</body>
</html>

## Example.java
package com.mywicket.wicket;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import org.apache.wicket.markup.html.WebPage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Example extends WebPage {

	Logger log = LoggerFactory.getLogger(Example.class);

	public class Person implements Serializable {

		String firstname;
		String lastname;

		public Person() {
		}

		public Person(String firstname, String lastname) {
			this.firstname = firstname;
			this.lastname = lastname;
		}

		public String getFirstname() {
			return firstname;
		}

		public void setFirstname(String firstname) {
			this.firstname = firstname;
		}

		public String getLastname() {
			return lastname;
		}

		public void setLastname(String lastname) {
			this.lastname = lastname;
		}

		private static final long serialVersionUID = 3754407033439696245L;
	}

	public Example() {
    	super();

    	List<Person> persons = new ArrayList<>(10);
    	persons.add(new Person("Smith", "John"));
    	persons.add(new Person("Johnson", "Emily"));
    	persons.add(new Person("Williams", "David"));
    	persons.add(new Person("Brown", "Sarah"));
    	persons.add(new Person("Davis", "Michael"));

    	DataListPanel<Person> datalist = new DataListPanel<>("dataPanel", Person.class, persons);
    	add(datalist);
    }


	private static final long serialVersionUID = 1L;
}
	<html xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd">
	<body>
	<wicket:panel>
	<table id="dataitems" class="table table-striped">
	<thead class="table-secondary">
	<th class="col-md-1" wicket:id="hdrRepeater"></th>
	</thead>
	<tbody>
	<wicket:container wicket:id="dataRepeater"></wicket:container>
	</tbody>
	</table>
	</wicket:panel>
	</body>
	</html>
	package com.mywicket.component;

	import java.beans.BeanDescriptor;
	import java.beans.BeanInfo;
	import java.beans.IntrospectionException;
	import java.beans.Introspector;
	import java.beans.PropertyDescriptor;
	import java.io.Serializable;
	import java.lang.reflect.InvocationTargetException;
	import java.util.Enumeration;
	import java.util.List;

	import org.apache.wicket.markup.html.basic.Label;
	import org.apache.wicket.markup.html.panel.Panel;
	import org.apache.wicket.markup.repeater.RepeatingView;
	import org.apache.wicket.model.IModel;
	import org.apache.wicket.model.Model;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;
	import org.slf4j.Marker;
	import org.slf4j.MarkerFactory;

	public class DataListPanel<T extends Serializable> extends Panel {

	Logger log = LoggerFactory.getLogger(DataListPanel.class);

	List<T> items;
	Class<T> itemclass;

	public DataListPanel(String id, Class<T> itemclass, List<T> items) {
	super(id);
	this.items = items;
	this.itemclass = itemclass;
	init();
	}

	protected void init() {
	Marker marker = MarkerFactory.getMarker("init()");

	try {
	BeanInfo beaninfo = Introspector.getBeanInfo(itemclass);
	PropertyDescriptor[] propdesc = beaninfo.getPropertyDescriptors();
	RepeatingView hdrItems = new RepeatingView("hdrRepeater");
	for(PropertyDescriptor pd : propdesc) {
	log.debug(marker, "{}", pd.getName());
	hdrItems.add(new Label(hdrItems.newChildId(), pd.getName()));
	}
	add(hdrItems);

	RepeatingView dataRows = new RepeatingView("dataRepeater");
	for(T item : items) {
	dataRows.add(new DataRowPanel<T>(dataRows.newChildId(), new Model<T>(item), itemclass));
	}
	add(dataRows);

	} catch (IntrospectionException e) {
	log.error(marker, e.getMessage());
	}

	}

	private static final long serialVersionUID = 773465778036471818L;
	}
	<!DOCTYPE html>
	<html xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd">
	<head>
	<meta charset="utf-8" />
	<title>Person List example</title>
	</head>
	<body>
	<h2>Persons</h2>
	<p>
	<div wicket:id="dataPanel"></div>

	</body>
	</html>
	package com.mywicket.wicket;

	import java.io.Serializable;
	import java.util.ArrayList;
	import java.util.List;

	import org.apache.wicket.markup.html.WebPage;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;

	public class Example extends WebPage {

	Logger log = LoggerFactory.getLogger(Example.class);

	public class Person implements Serializable {

	String firstname;
	String lastname;

	public Person() {
	}

	public Person(String firstname, String lastname) {
	this.firstname = firstname;
	this.lastname = lastname;
	}

	public String getFirstname() {
	return firstname;
	}

	public void setFirstname(String firstname) {
	this.firstname = firstname;
	}

	public String getLastname() {
	return lastname;
	}

	public void setLastname(String lastname) {
	this.lastname = lastname;
	}

	private static final long serialVersionUID = 3754407033439696245L;
	}

	public Example() {
	super();

	List<Person> persons = new ArrayList<>(10);
	persons.add(new Person("Smith", "John"));
	persons.add(new Person("Johnson", "Emily"));
	persons.add(new Person("Williams", "David"));
	persons.add(new Person("Brown", "Sarah"));
	persons.add(new Person("Davis", "Michael"));

	DataListPanel<Person> datalist = new DataListPanel<>("dataPanel", Person.class, persons);
	add(datalist);
	}


	private static final long serialVersionUID = 1L;
	}