PHP+Ajax implements paging technology_PHP tutorial

PHP+Ajax implementation of paging technology:

Paging technology code based on php and ajax. There are two php files below, one is sn_inq.php and the other is sn_show.php. The former php file calls the next php file to implement ajax paging. Just run sn_inq. To achieve the effect, you have to modify the database. The specific code is as follows: Pay special attention to modifications in the areas marked in red!

My database name is inv, the table name is sn, and the fields are: sn_id, sn_plant, sn_sales, sn_act, sn_type, sn_sts....

1.sn_inq.php

//getFormValue is used to get the values ​​of all input controls in the form, and combine the input values ​​into a string and send it to the server.

//注意：此处如果有filesedset的话，form表单一定要放在fieldset里面，否则出错。
echo '

SN	to  onClick="showcomment(1)"/>

';

?>

2.sn_show.php:

//page function
function showpage(total){
global page,pagenav,middle,num,pagenum,offset,prepg,nextpg;
//Get the value of page in page=18. If page does not exist, then the page number is 1.
page=isset(_REQUEST['page'])?intval(_REQUEST['page']):1;
//Each layer of paging bars displays 4 paging connections
middle = '4';
//Display 10 pieces of data per page
num=10;
//Get the total number of pages, which is also the last page
pagenum=ceil(total/num);
//Get homepage
page=min(pagenum,page);
//Previous page
prepg=page-1;
//Next page
nextpg=(page==pagenum ? 0 : page+1);
offset=(page-1)*num;

if(pagenum<=1) return false;

if(prepg){
pagenav.=' onclick="javascript：showcomment(1);">'.iconv('gb2312','gb2312','Homepage'). ' ';
pagenav.=' onclick="javascript：showcomment('.prepg.');">'.iconv('gb2312','gb2312',' Previous page').' ';
}else{
pagenav.="".iconv('gb2312','gb2312','Homepage').""." ";
pagenav.="".iconv('gb2312','gb2312','Previous page')."";
}

if(nextpg){
pagenav.=' onclick="javascript：showcomment('.nextpg.');">'.iconv('gb2312','gb2312',' Next page').' ';
pagenav.=' onclick="javascript：showcomment('.pagenum.');">'.iconv('gb2312','gb2312',' Last page').' ';
}else{
pagenav.="".iconv('gb2312','gb2312','next page').""." ";
pagenav.="".iconv('gb2312','gb2312','Last page').""." ";
}

pagenav.=''.iconv('gb2312','gb2312','total') . pagenum .' '.iconv('gb2312','gb2312','page');
for(h=(page-middle<1?1:page-middle);h<=(page+middle>pagenum?pagenum:page+middle);h++){
if(h==page){
pagenav.=" h ";
}else{
pagenav.="  ".iconv('gb2312','gb2312',h)."  ; ";
}
}

pagenav.="    ";
pagenav.=iconv('gb2312','gb2312','Go to ');

pagenav.="";
for (i = 1; i <= pagenum;i++){
if(page == i){
pagenav.= "".i."";
}else{
pagenav.= "".i."";
}
}
pagenav.="";
pagenav.="page";
return pagenav;
}

//connect to database
function db_link()
{
access_id = "root";
db_name = "inv";
@ db = mysql_connect('localhost', access_id, '831025') or 
die("Could not connect to database. Please contact with IT supporting team ASAP.");
mysql_query("SET NAMES 'GBK'");
mysql_select_db(db_name);
return db;
}
link = db_link();

//get inquiry criteria,用 POST取得数据也行
sn_id_1 = _REQUEST['sn_id_1'];
sn_id_2 = _REQUEST['sn_id_2'];

//inquiry total pages
sn_sql = "SELECT * FROM sn WHERE 1 ";
if (sn_id_1 != ''){
sn_sql .= "AND sn_id >= '".sn_id_1."' ";
}
if (sn_id_2 != ''){
sn_sql .= "AND sn_id <= '".sn_id_2."' ";
}
sn_sql .= "ORDER BY sn_id DESC ";

sn_res = mysql_query(sn_sql);
total = mysql_num_rows(sn_res);

//show page
pageshow = showpage(total);

//inquiry current page
sn_sql .= " limit offset,num";
sn_res = mysql_query(sn_sql);
sn_num = mysql_num_rows(sn_res);

//output inquiry result as XML
header("Content-Type: text/xml");
if(total > 0){
echo '';
echo '';
echo ' echo '

LIST

';
num = offset;
for (i = 0; i < sn_num; i++) {
sn_row = mysql_fetch_array(sn_res);
if (i % 2 == 0) {
echo '';
}else{
echo '';
}
echo'











';
num++;
}
echo '

No	SN	Plant	Sales	Act	Type	Status	Release Date	Approve Date	Reject Date	Cancel Date	Close Date
'.(num+1).'	'.sn_row['sn_id'].'	'.sn_row['sn_plant'].'	'.sn_row['sn_sales'].'	'.sn_row['sn_act'].'	'.sn_row['sn_type'].'	'.sn_row['sn_sts'].'	'.substr(sn_row['sn_rel_date'],0,10).'	'.substr(sn_row['sn_apv_date'],0,10).'	'.substr(sn_row['sn_rej_date'],0,10).'	'.substr(sn_row['sn_can_date'],0,10).'	'.substr(sn_row['sn_cls_date'],0,10).'

';
echo '

'.pageshow.'

';
echo '

';
echo ']]>';
echo '';
}else{
echo 'find nothing';
}

?>

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