{"id":1119,"date":"2012-04-11T04:00:00","date_gmt":"2012-04-11T04:00:00","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/2012\/10\/lazy-jsf-primefaces-datatable-pagination-part-2.html"},"modified":"2012-10-21T23:34:55","modified_gmt":"2012-10-21T23:34:55","slug":"lazy-jsf-primefaces-datatable_11","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2012\/04\/lazy-jsf-primefaces-datatable_11.html","title":{"rendered":"Lazy JSF Primefaces Datatable Pagination – Part 2"},"content":{"rendered":"
The page code is very simple and there is no complication. Check the \u201cindex.xhtml\u201d code: <\/p>\n
<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD XHTML 1.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/xhtml1\/DTD\/xhtml1-transitional.dtd\">\r\n<html xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" xmlns:ui=\"http:\/\/java.sun.com\/jsf\/facelets\"\r\n    xmlns:h=\"http:\/\/java.sun.com\/jsf\/html\" xmlns:f=\"http:\/\/java.sun.com\/jsf\/core\" xmlns:p=\"http:\/\/primefaces.org\/ui\">\r\n<h:head>\r\n<\/h:head>\r\n<h:body>\r\n    <f:view>\r\n        <h:form>\r\n            <p:dataTable id=\"lazyDataTable\" value=\"#{playerMB.allPlayers}\" var=\"player\" paginator=\"true\" rows=\"10\"\r\n                selection=\"#{playerMB.player}\" selectionMode=\"single\"\r\n                paginatorTemplate=\"{CurrentPageReport}  {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}\"\r\n                rowsPerPageTemplate=\"5,10,15\" style=\"width: 80%;margin-left: 10%;margin-right: 10%;\">\r\n\r\n                <p:ajax event=\"rowSelect\" update=\":playerDialogForm\" oncomplete=\"playerDetails.show()\" \/>\r\n\r\n                <p:column>\r\n                    <f:facet name=\"header\">Name<\/f:facet>\r\n                    <h:outputText value=\"#{player.name}\" \/>\r\n                <\/p:column>\r\n                <p:column>\r\n                    <f:facet name=\"header\">Age<\/f:facet>\r\n                    <h:outputText value=\"#{player.age}\" \/>\r\n                <\/p:column>\r\n            <\/p:dataTable>\r\n        <\/h:form>\r\n\r\n        <p:dialog widgetVar=\"playerDetails\" header=\"Player\" modal=\"true\">\r\n            <h:form id=\"playerDialogForm\">\r\n                <h:panelGrid columns=\"2\">\r\n                    <h:outputText value=\"Id: \" \/>\r\n                    <h:outputText value=\"#{playerMB.player.id}\" \/>\r\n                    <h:outputText value=\"Name: \" \/>\r\n                    <h:outputText value=\"#{playerMB.player.name}\" \/>\r\n                    <h:outputText value=\"Age: \" \/>\r\n                    <h:outputText value=\"#{playerMB.player.age}\" \/>\r\n                <\/h:panelGrid>\r\n            <\/h:form>\r\n        <\/p:dialog>\r\n    <\/f:view>\r\n<\/h:body>\r\n<\/html>\r\n<\/pre>\n
We got a lazy datatable that will display a selected value in a dialog.  <\/p>\n
In our Managed Bean we have a simpler code than the page: 
 
<\/div> <\/div><\/p>\n
package com.mb;\r\n\r\nimport java.io.Serializable;\r\n\r\nimport javax.faces.bean.ManagedBean;\r\nimport javax.faces.bean.ViewScoped;\r\n\r\nimport org.primefaces.model.LazyDataModel;\r\n\r\nimport com.model.Player;\r\n\r\n@ViewScoped\r\n@ManagedBean\r\npublic class PlayerMB implements Serializable {\r\n\r\n    private static final long serialVersionUID = 1L;\r\n    private LazyDataModel<Player> players = null;\r\n    private Player player;\r\n\r\n    public LazyDataModel<Player> getAllPlayers() {\r\n        if (players == null) {\r\n            players = new PlayerLazyList();\r\n        }\r\n\r\n        return players;\r\n    }\r\n\r\n    public Player getPlayer() {\r\n        if(player == null){\r\n            player = new Player();\r\n        }\r\n\r\n        return player;\r\n    }\r\n\r\n    public void setPlayer(Player player) {\r\n        this.player = player;\r\n    }\r\n}\r\n<\/pre>\n
We got a get\/set to the Player entity and a get to the an object of the LazyDataModel type.
\nCheck bellow the implementation of the PlayerLazyList code <\/p>\n
package com.mb;\r\n\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\nimport org.primefaces.model.LazyDataModel;\r\nimport org.primefaces.model.SortOrder;\r\n\r\nimport com.connection.MyTransaction;\r\nimport com.dao.PlayerDAO;\r\nimport com.model.Player;\r\n\r\npublic class PlayerLazyList extends LazyDataModel<Player> {\r\n\r\n    private static final long serialVersionUID = 1L;\r\n\r\n    private List<Player> players;\r\n\r\n    private MyTransaction transaction;\r\n\r\n    private PlayerDAO playerDAO;\r\n\r\n    @Override\r\n    public List<Player> load(int startingAt, int maxPerPage, String sortField, SortOrder sortOrder, Map<String, String> filters) {\r\n        try {\r\n            try {\r\n                transaction = MyTransaction.getNewTransaction();\r\n                playerDAO =  new PlayerDAO(transaction);\r\n\r\n                transaction.begin();\r\n\r\n                \/\/ with datatable pagination limits\r\n                players = playerDAO.findPlayers(startingAt, maxPerPage);\r\n\r\n                \/\/ If there is no player created yet, we will create 100!!\r\n                if (players == null || players.isEmpty()) {\r\n                    playerDAO.create100Players();\r\n\r\n                    \/\/ we will do the research again to get the created players\r\n                    players = playerDAO.findPlayers(startingAt, maxPerPage);\r\n                }\r\n            } finally {\r\n                transaction.commit();\r\n            }\r\n        } catch (Exception e) {\r\n            e.printStackTrace();\r\n        }\r\n\r\n        \/\/ set the total of players\r\n        if(getRowCount() <= 0){\r\n            setRowCount(playerDAO.countPlayersTotal());\r\n        }\r\n\r\n        \/\/ set the page dize\r\n        setPageSize(maxPerPage);\r\n\r\n        return players;\r\n    }\r\n\r\n    @Override\r\n    public Object getRowKey(Player player) {\r\n        return player.getId();\r\n    }\r\n\r\n    @Override\r\n    public Player getRowData(String playerId) {\r\n        Integer id = Integer.valueOf(playerId);\r\n\r\n        for (Player player : players) {\r\n            if(id.equals(player.getId())){\r\n                return player;\r\n            }\r\n        }\r\n\r\n        return null;\r\n    }\r\n}\r\n<\/pre>\n
About the code above:<\/p>\n