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Use DWR to easily implement Ajax Paging

Source: Internet
Author: User
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Bkjia.com documentThis tutorial uses DWR (a Java Implementation of AJAX) as the page!

 1. The following is the configuration of DWR.

(1) Configure DWRServlet in web. xml as follows:

Reference content is as follows:

<Servlet>
       <Servlet-name> dwr-invoker </servlet-name>
       <Display-name> DWR Servlet </display-name>
       <Description> Direct Web Remoter Servlet </description>
       <Servlet-class> uk. ltd. getahead. dwr. DWRServlet </servlet-class>
       <Init-param>
           <Param-name> debug </param-name>
           <Param-value> true </param-value>
       </Init-param>
   </Servlet>

   <Servlet-mapping>
       <Servlet-name> dwr-invoker </servlet-name>
       <Url-pattern>/dwr/* </url-pattern>
   </Servlet-mapping>

(2) Configure in dwr. xml

Reference content is as follows:
<Dwr>
 <Allow>
 <Create javascript = "GetPages" creator = "new">
  <Param name = "class" value = "com. GetPages"> </param>
 </Create>
 <Convert match = "com. PageBean" converter = "bean">
  <Param name = "include" value = "job_id, job_desc, min_lvl, max_lvl"> </param>
 </Convert>
 </Allow>
</Dwr>

2. Compile PageBean to store the data to be displayed

Reference content is as follows:
 Private String job_id;
 Private String job_desc;
 Private String min_lvl;
 Private String max_lvl;

3. Compile the getPage class to implement paging. The Code is as follows:

Reference content is as follows:
 Public int getFirst (int page)
 {
 Pages = page;
 Return pages;
 }
 Public int getNext (int page)
 {
 If (page = pageCount)
 {
  Return pageCount;
 } Else
 {
  Pages = page;
  Return pages + 1;
 }
 }
 Public int getUp (int page)
 {
 If (page = 1)
 {
  Return pages;
 } Else
 {
  Pages = page;
  Return pages-1;
 }
 }
 Public int getLast (int page)
 {
 Return pageCount;
 }
 Public List <PageBean> getJobs (int page)
 {
 List = new ArrayList <PageBean> ();
 String SQL;
 Con = connect. getCon ();
 Try {
  Stm = con. createStatement ();
  If (page = 1)
  {
   SQL = "select top 5 * from jobs ";
  } Else
  {
   SQL = "select top 5 * from jobs where job_id not in (select top" + 5 * (page-1) + "job_id from jobs )";
  }
  Rs1_cmd.exe cuteQuery (SQL );
  While (rs. next ())
  {
   Pb = new PageBean ();
   Pb. setJob_id (rs. getString ("job_id"). toString ());
   Pb. setJob_desc (rs. getString ("job_desc"). toString ());
   Pb. setMin_lvl (rs. getString ("min_lvl"). toString ());
   Pb. setMax_lvl (rs. getString ("max_lvl"). toString ());
   List. add (pb );
  }
 } Catch (SQLException e ){
  // TODO Auto-generated catch block
  E. printStackTrace ();
 }
 Return list;
 }

4. Create a page and call the method in the getPage class.

Reference content is as follows:

<Html>
 <Head>
 <Script type = "text/javascript" src = "dwr/util. js"> </script>
 <Script type = "text/javascript" src = "dwr/engine. js"> </script>
 <Script type = "text/javascript" src = "dwr/interface/GetPages. js"> </script>
   <Script type = "text/javascript">
    Var page = 1;
    
    Function first ()
    {
     GetPages. getFirst (1, callback );
    }
    Function callback (pages)
    {
     Page = pages;
     GetPages. getJobs (pages, process );
    }
    Function next ()
    {
     GetPages. getNext (page, callback );
    }
    Function up ()
    {
     GetPages. getUp (page, callback );
    }
    Function last ()
    {
     GetPages. getLast (page, callback );
    }
    Function process (item)
    {
     DWRUtil. removeAllRows ("job ");
      Var cell = [
       Function (item) {return item. job_id },
       Function (item) {return item. job_desc },
       Function (item) {return item. min_lvl },
       Function (item) {return item. max_lvl}
      ];
      DWRUtil. addRows ("job", item, cell );
    }
    
   </Script>
 </Head>
 
 <Body onload = "javaScript: first ();">
 <Table border = "1">
  <Tbody id = "job">
   
  </Tbody>
 </Table>
   <A href = "javaScript: first ()"> page 1 </a> & nbsp;
   <A href = "javaScript: up ()"> previous page </a> & nbsp;
   <A href = "javaScript: next ()"> next page </a> & nbsp;
   <A href = "javaScript: last ()"> last page </a> & nbsp;
 </Body>
</Html>

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