PHP+Ajax实现分页技术

PHP+Ajax实现分页技术：

基于php和ajax的分页技术代码，下面有两个php文件，一个是sn_inq.php，另一个是sn_show.php，前一个php文件调用后一个php文件，实现ajax分页，运行sn_inq即可实现效果，不过得修改数据库哦。具体代码如下：红色标注的地方要特别注意修改哦！

我的数据库名是inv，表名是sn，字段有：sn_id,sn_plant,sn_sales,sn_act,sn_type,sn_sts.....

1.sn_inq.php

//getFormValue 用于获取表单中所有输入控件的值，并将输入值组成一个字符串传到服务器。

<script type="text/javascript">
function getFormValue(form){
var str='';
var ft,fv;
for (var i=0; i<form.elements.length; i++){
fv = form.elements[i];
ft = fv.type.toLowerCase();
switch(ft){
case 'select-one':
str+=fv.name+'='+escape(fv.value)+'&';
break;
case 'radio':
if (fv.checked){
str+=fv.name+'='+escape(fv.value)+'&';
}
break;
case 'checkbox':
if (fv.checked){
str+=fv.name+'='+escape(fv.value)+'&';
}
break;
case 'text':
str+=fv.name+'='+escape(fv.value)+'&';
break;
case 'password':
str+=fv.name+'='+escape(fv.value)+'&';
break;
case 'hidden':
str+=fv.name+'='+escape(fv.value)+'&';
break;
case 'textarea':
str+=fv.name+'='+escape(fv.value)+'&';
break;
default:
break;
}
}
return str.split(/\s/).join('')
}
 

//showcomment(page) 用于显示分页数据，被查询按钮onclick 事件调用， url为后台处理数据并输出XML格式数据的文件url。

function showcomment(page) {
var x = new Ajax('statusid', 'XML');
url = 'sn_show.php?page='+page+'&'+getFormValue(document.form1);

x.get(url , function(s) {
if(s.lastChild){
getbyid("show").innerHTML = "Loading……";
getbyid("show").innerHTML = s.lastChild.firstChild.nodeValue;
removeLoading(document.getElementById("show"));
}
else{
document.form1.submit();
}
});
}

//displayLoading用于显示Loading，提示用户等待

function displayLoading(element) {
var image = document.createElement("img");
image.setAttribute("src","progressbar.gif");
image.setAttribute("title","loading...");
var text = document.createTextNode("loading……");
element.appendChild(image);
element.appendChild(text);
}

//removeLoading用于去掉Loading

function removeLoading(element){
var image = element.getElementsByTagName("img");
for(var i=0;i<image.length;i++){
element.removeChild(image[i]);
}
}

//ajax

function Ajax(statusId, recvType) {
var aj = new Object();
displayLoading(document.getElementById("show"));
var clientHeight = scrollTop = 0;
if(navigator.userAgent.toLowerCase().indexOf('opera') > -1) {
clientHeight = document.body.clientHeight;
scrollTop = document.body.scrollTop;
} else {
clientHeight = document.documentElement.clientHeight;
scrollTop = document.documentElement.scrollTop;
}
if(document.getElementById(statusId)) {
aj.statusId = document.getElementById(statusId);
document.getElementById(statusId).style.top = 10+"px";
} else {
var divElement = document.createElement("DIV");
divElement.id = "xspace-tipDiv";
divElement.className = "xspace-ajaxdiv";
divElement.style.cssText = "width:200px; height:40px; line-height: 40px; text-align: center;";
divElement.style.left = 10+"px";
divElement.style.top = 10+"px";//(clientHeight +scrollTop - 60)
divElement.id = statusId;
document.body.appendChild(divElement);
aj.statusId = divElement;
}
aj.targetUrl = '';
aj.sendString = '';
aj.recvType = recvType ? recvType : 'HTML';//HTML XML
aj.resultHandle = null;
aj.createXMLHttpRequest = function() {
var request = false;
if(window.XMLHttpRequest) {
request = new XMLHttpRequest();
if(request.overrideMimeType) {
request.overrideMimeType('text/xml');
}
} else if(window.ActiveXObject) {
var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
for(var i=0; i<versions.length; i++) {
try {
request = new ActiveXObject(versions[i]);
if(request) {
return request;
}
} catch(e) {
//alert(e.message);
}
}
}
return request;
}
aj.XMLHttpRequest = aj.createXMLHttpRequest();
aj.processHandle = function() {
aj.statusId.style.display = '';
if(aj.XMLHttpRequest.readyState == 4) {
if(aj.XMLHttpRequest.status == 200) {
if(aj.recvType == 'HTML') {
aj.resultHandle(aj.XMLHttpRequest.responseText);
} else if(aj.recvType == 'XML') {
aj.resultHandle(aj.XMLHttpRequest.responseXML);
}
aj.statusId.style.display = 'none';
} else {
aj.statusId.innerHTML = xml_http_load_failed;
}
}
}

aj.get = function(targetUrl, resultHandle) {
aj.targetUrl = targetUrl;
aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
aj.resultHandle = resultHandle;
if(window.XMLHttpRequest) {
aj.XMLHttpRequest.open('GET', aj.targetUrl);
aj.XMLHttpRequest.send(null);
} else {
aj.XMLHttpRequest.open("GET", targetUrl, true);
aj.XMLHttpRequest.send();
}
}

aj.post = function(targetUrl, sendString, resultHandle) {
aj.targetUrl = targetUrl;
aj.sendString = sendString;
aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
aj.resultHandle = resultHandle;
aj.XMLHttpRequest.open('POST', targetUrl);
aj.XMLHttpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
aj.XMLHttpRequest.send(aj.sendString);
}
return aj;
}

function getbyid(id) {
if (document.getElementById) {
return document.getElementById(id);
} else if (document.all) {
return document.all[id];
} else if (document.layers) {
return document.layers[id];
} else {
return null;
}
}
</script>

<?php

//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 '<form name="form1" action="" method="post">
<table cellpadding="0" cellspacing="1">
<tr>
<th class="criteria">SN</th>
<td>
<input type="text" name="sn_id_1" value="'._POST['sn_id_1'].'" size="16" maxlength="8"/> to
<input type="text" name="sn_id_2" value="'._POST['sn_id_2'].'" size="16" maxlength="8"/>
<input type="button" name="sn_submit" value="Search" onClick="showcomment(1)"/>
</td>
</tr>
</table>
</form>
<div id="show"></div>';

?>

2.sn_show.php:

<?php
//page function
function showpage(total){
global page,pagenav,middle,num,pagenum,offset,prepg,nextpg;
//获取page=18中的page的值，假如不存在page，那么页数就是1。
page=isset(_REQUEST['page'])?intval(_REQUEST['page']):1;
//每层分页条显示4个分页连接
middle = '4';
//每页显示10条数据
num=10;
//获得总页数,也是最后一页
pagenum=ceil(total/num);
//获得首页
page=min(pagenum,page);
//上一页
prepg=page-1;
//下一页
nextpg=(page==pagenum ? 0 : page+1);
offset=(page-1)*num;

if(pagenum<=1) return false;

if(prepg){
pagenav.=' <a href="javascript：;" onclick="javascript：showcomment(1);">'.iconv('gb2312','gb2312','首页').'</a> ';
pagenav.=' <a href="javascript：;" onclick="javascript：showcomment('.prepg.');">'.iconv('gb2312','gb2312','上一页').'</a> ';
}else{
pagenav.="<font color='gray'>".iconv('gb2312','gb2312','首页')."</font>"."&nbsp";
pagenav.="<font color='gray'>".iconv('gb2312','gb2312','上一页')."</font>";
}

if(nextpg){
pagenav.=' <a href="javascript：;" onclick="javascript：showcomment('.nextpg.');">'.iconv('gb2312','gb2312','下一页').'</a> ';
pagenav.=' <a href="javascript：;" onclick="javascript：showcomment('.pagenum.');">'.iconv('gb2312','gb2312','尾页').'</a> ';
}else{
pagenav.="<font color='gray'>".iconv('gb2312','gb2312','下一页')."</font>"."&nbsp";
pagenav.="<font color='gray'>".iconv('gb2312','gb2312','尾页')."</font>"."&nbsp";
}

pagenav.='</select>'.iconv('gb2312','gb2312','共 ') . pagenum .'&nbsp'.iconv('gb2312','gb2312','页');
for(h=(page-middle<1?1:page-middle);h<=(page+middle>pagenum?pagenum:page+middle);h++){
if(h==page){
pagenav.="<b> h </b>";
}else{
pagenav.="&nbsp;&nbsp;<a href=\"javascript：showcomment(".h.");\">".iconv('gb2312','gb2312',h)."</a>&nbsp;&nbsp;";
}
}

pagenav.="&nbsp;&nbsp;&nbsp;&nbsp;";
pagenav.=iconv('gb2312','gb2312','转到 ');

pagenav.="<select id='JumpSelect' name='NowPage' size='1' onchange=\"showcomment(this.value);\">";
for (i = 1; i <= pagenum;i++){
if(page == i){
pagenav.= "<option value='".i."' selected>".i."</option>";
}else{
pagenav.= "<option value='".i."' >".i."</option>";
}
}
pagenav.="</select>";
pagenav.="页";
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 '<?xml version="1.0" encoding="gb2312"?>';
echo '<root>';
echo '<![CDATA[';
echo '<fieldset class="inquiry">
<legend>LIST</legend>
<table class="list">
<tr>
<th class="header">No</th>
<th class="header">SN</th>
<th class="header">Plant</th>
<th class="header">Sales</th>
<th class="header">Act</th>
<th class="header">Type</th>
<th class="header">Status</th>
<th class="header">Release Date</th>
<th class="header">Approve Date</th>
<th class="header">Reject Date</th>
<th class="header">Cancel Date</th>
<th class="header">Close Date</th>
</tr>';
num = offset;
for (i = 0; i < sn_num; i++) {
sn_row = mysql_fetch_array(sn_res);
if (i % 2 == 0) {
echo '<tr class="even" style="cursor:hand" >';
}else{
echo '<tr class="odd" style="cursor:hand" >';
}
echo'<td class="list center">'.(num+1).'</td>
<td class="list right blue">'.sn_row['sn_id'].'</td>
<td class="list center">'.sn_row['sn_plant'].'</td>
<td class="list right">'.sn_row['sn_sales'].'</td>
<td class="list center red">'.sn_row['sn_act'].'</td>
<td class="list center">'.sn_row['sn_type'].'</td>
<td class="list center">'.sn_row['sn_sts'].'</td>
<td class="list left">'.substr(sn_row['sn_rel_date'],0,10).'</td>
<td class="list left">'.substr(sn_row['sn_apv_date'],0,10).'</td>
<td class="list left">'.substr(sn_row['sn_rej_date'],0,10).'</td>
<td class="list left">'.substr(sn_row['sn_can_date'],0,10).'</td>
<td class="list left">'.substr(sn_row['sn_cls_date'],0,10).'</td>
</tr>';
num++;
}
echo '</table>';
echo '<div>'.pageshow.'</div>';
echo '</fieldset>';
echo ']]>';
echo '</root>';
}else{
echo 'find nothing';
}

?>