Use ajax to implement paging and deletion (2)

After all the information in the database can be traversed and displayed, the page is displayed on the JSP page.

// Add nodes implemented by PAGE

FunctionPagesnode (pageshtmlnode, rootnode ){

// Obtain the current page

VaRNowpage = rootnode. getattribute ("nowpage ");

// Obtain the total number of pages

VaRCountpage = rootnode. getattribute ("countpage ");

// Obtain the total number of records

VaRCountsize = rootnode. getattribute ("countsize ");

 

VaRMsgnode = Document. createtextnode ("current" + nowpage + "Page, total"

+ Countpage + "Page, total" + countsize + "record ");

// Clearing method

Clearnodes (pageshtmlnode );

VaRFirstpage = Document. createelement ("");

Firstpage. setattribute ("href ","#");

Firstpage. appendchild (document. createtextnode ("Homepage "));

Firstpage. onclick =Function(){

Nowpage = 1;

// Query information on the current page

Getpagesinfo (nowpage );

}

Pageshtmlnode. appendchild (firstpage );

VaRBackpage = Document. createelement ("");

Backpage. setattribute ("href ","#");

Backpage. appendchild (document. createtextnode ("Previous Page "));

Backpage. onclick =Function(){

Nowpage = eval (nowpage + "-" + 1 );

If(Nowpage <= 1 ){

Nowpage = 1;

}

//// Query Information on the current page

Getpagesinfo (nowpage );

}

Pageshtmlnode. appendchild (backpage );

VaRNextpage = Document. createelement ("");

Nextpage. setattribute ("href ","#");

Nextpage. appendchild (document. createtextnode ("next page "));

Nextpage. onclick =Function(){

Nowpage = eval (nowpage + "+" + 1 );

If(Nowpage> = countpage ){

Nowpage = countpage;

}

// Query information on the current page

Getpagesinfo (nowpage );

}

Pageshtmlnode. appendchild (nextpage );

VaRLastpage = Document. createelement ("");

Lastpage. setattribute ("href ","#");

Lastpage. appendchild (document. createtextnode ("last page "));

Lastpage. onclick =Function(){

Nowpage = countpage;

// Query information on the current page

Getpagesinfo (nowpage );

}

Pageshtmlnode. appendchild (lastpage );

Pageshtmlnode. appendchild (msgnode );

}

 

 

// Paging code

FunctionGetpagesinfo (nowpage ){

// Modify chkshtmlnode to the default value

VaRChkshtmlnode = getnode ("Chk ");

Chkshtmlnode. Checked =Null;

 

VaRPageshtmlnode = getnode ("pages ");

VaREmpshtmlnode = getnode ("EMPs ");

// XML data passed from the server is parsed here

// Step 1: Create an XMLHTTPRequest object

VaRXMLHTTP = createxmlhttprequest ();

// Clear

Clearnodes (empshtmlnode );

XMLHTTP. onreadystatechange =Function(){

If(XMLHTTP. readystate = 4 ){

If(XMLHTTP. Status = 200 ){

// Obtain xmldocument

VaRXmldoc = XMLHTTP. responsexml;

// Obtain the tag

VaRRootnode = xmldoc.doc umentelement;

// Obtain all EMP element nodes in the XML file

VaREMPs = xmldoc. getelementsbytagname ("EMP"); // EMP id = "XXX"

// Obtain all child nodes in the EMP Node

For(VaRI = 0; I <EMPs. length; I ++ ){

// Obtain a specific EMP:

VaREmpnode = EMPs [I];

// Create a row for EMP

VaRTr = Document. createelement ("TR ");

// Create the ID TD

VaRTD1 = Document. createelement ("TD ");

Td1.appendchild (document. createtextnode (EMPs [I]

. Getattribute ("ID ")));

Tr. appendchild (TD1 );

VaRElementnodes = empnode. childnodes; // name, sex, age

For(VaRJ = 0; j <elementnodes. length; j ++ ){

// Whether the node is an element node

If(Elementnodes [J]. nodetype = 1 ){

VaRTd2 = Document. createelement ("TD ");

Td2

. Appendchild (document

. Createtextnode (elementnodes [J]. firstchild. nodevalue ));

Tr. appendchild (td2 );

}

}

VaRDelchk = Document. createelement ("input ");

Delchk. setattribute ("type", "checkbox ");

Delchk. setattribute ("name", "delchk ");

Delchk

. Setattribute ("value", EMPs [I]

. Getattribute ("ID "));

Tr. appendchild (delchk );

Empshtmlnode. appendchild (TR );

Empshtmlnode. appendchild (TR );

}

// Call the page to create a Node object related to the page

Pagesnode (pageshtmlnode, rootnode );

}

}

}

// Step 2: Specify the Request Parameters

XMLHTTP. Open ("get", "./employeeservlet? Nowpage = "+ nowpage

+ "& Timestamp =" +NewDate (). gettime (),
True);

// Step 3: send the request

XMLHTTP. Send (Null);

}

In this case, compared with the previous servlet, the servlet actually transfers several more parameters.

Add the parameters to be passed before the for loop.

Out. println ("<? Xmlversion = \ "1.0 \" encoding = \ "UTF-8 \"?> ");

// Transfer the total number of records on the current page to the EMPs and tag

Out. println ("<empsnowpage = '" + Page. getnowpage () + "'countsize = '" + Page. getcountsize () + "'countpage = '" + Page. getcountpage () + "'> ");

For (INTI = 0; I <EMPs. Size (); I ++ ){

Employeeemp = EMPs. Get (I );

Out. println ("<empid = '" + EMP. GETID () + "'> ");

Out. println ("<Name>" + EMP. gethrname () + "</Name> ");

Out. println ("<sex>" + EMP. gethrsex () + "</sex> ");

Out. println ("<age>" + EMP. gethrage () + "</age> ");

Out. println ("<birth>" + EMP. gethrbirth () + "</birth> ");

Out. println ("<salary>" + EMP. gethrsalary () + "</salary> ");

Out. println ("</EMP> ");

}

Out. println ("</EMPs> ");

Of course, you must obtain and judge the parameters before passing them.

Stringnowpage = request. getparameter ("nowpage ");

System. Out. println ("========" + nowpage );

Intnowpage = 1;

If (nowpage = NULL ){

Nowpage = 1;

} Else {

Nowpage = integer. parseint (nowpage );

}