About the CI framework to implement ajax paging and select all, invert selection, unselect and batch deletion code

//ajax分页+搜索（视图层）
function ajax_page(page){
var sou = $('#sou').val();
$.ajax({
type: "POST",
dataType: "json",
url: "<?PHP echo site_url(&#39;Welcome/ajax_page&#39;)?>",
data: "page="+page+"&sou="+sou,
success: function(data){
var str="";
str+="<table border=&#39;1&#39; style=&#39;text-align:center&#39;>";
str+="<tr>";
str+="<td><input type=&#39;checkbox&#39; class=&#39;quan&#39;/></td>";
str+="<td>ID</td>";
str+="<td>用户名</td>";
str+="<td>操作</td>";
str+="</tr>";
$.each(data.list,function(i,item){
if(item.state==0){
var locks = "<a href=&#39;JavaScript:void(0)&#39; class=&#39;lok&#39; fla=&#39;"+item.id+"&#39; id=&#39;lock"+item.id+"&#39;>未锁定</a>"
}else{
var locks = "<a href=&#39;javascript:void(0)&#39; class=&#39;lok&#39; fla=&#39;"+item.id+"&#39; id=&#39;lock"+item.id+"&#39;>锁定</a>"
}
str+="<tr id=&#39;av"+item.id+"&#39;>";
str+="<td><input type=&#39;checkbox&#39; class=&#39;ss&#39; value=&#39;"+item.id+"&#39;/></td>";
str+="<td>"+item.id+"</td>";
str+="<td>"+item.name+"</td>";
str+="<td>"+locks+"</td>";
str+="</tr>";
})
str+="<tr>";
str+="<td><input type=&#39;button&#39; id=&#39;pdel&#39; value=&#39;批量删除&#39;></td>"
str+="</tr>";
str+="</table>";
str+=data.pagestr;
$(&#39;#content&#39;).html(str);
}
})
}
//状态切换
$(document).on(&#39;click&#39;,&#39;.lok&#39;,function(){
var id = $(this).attr(&#39;fla&#39;);
$.ajax({
type: "POST",
url: "<?php echo site_url(&#39;Welcome/upds&#39;)?>",
data: "id="+id,
success: function(msg){
if(msg==1){
$(&#39;#lock&#39;+id).html("锁定");
}else{
$(&#39;#lock&#39;+id).html("未锁定");
}
}
})
})
//批量删除
$(document).on(&#39;click&#39;,&#39;#pdel&#39;,function(){
var ids = $(&#39;.ss&#39;);
var str="";
$.each(ids,function(i,item){
if(ids[i].checked==true){
str=str+&#39;,&#39;+ids[i].value;
}
})
var new_str=str.substr(1);
$.ajax({
type: "POST",
url: "<?php echo site_url(&#39;Welcome/pdels&#39;)?>",
data: "new_str="+new_str,
success: function(msg){
$.each(ids,function(i,item){
if(ids[i].checked==true){
$(&#39;#av&#39;+ids[i].value).remove();
}
})
}
})
})
//全选(复选框)
$(document).on(&#39;click&#39;,&#39;.quan&#39;,function(){
var obj = $(&#39;:checkbox&#39;);
var ids = $(&#39;.ss&#39;);
if(obj[0].checked==true){
$.each(ids,function(i,item){
ids[i].checked=true;
})
}else{
$.each(ids,function(i,item){
ids[i].checked=false;
})
}
})
<td><input type="checkbox" class="checks" value="<?php echo $val[&#39;u_id&#39;]?>"/></td>
//全选（按钮）
$(&#39;.quan&#39;).click(function(){
var ids = $(&#39;input:checkbox&#39;);
$.each(ids,function(i,item){
ids[i].checked=true;
})
})
//全不选
$(&#39;.bu&#39;).click(function(){
var ids = $(&#39;input:checkbox&#39;);
$.each(ids,function(i,item){
ids[i].checked=false;
})
})
//反选
$(&#39;.fan&#39;).click(function(){
var ids = $(&#39;.checks&#39;);
$.each(ids,function(i,item){
ids[i].checked=!ids[i].checked;
})
})
//即点即改
$(document).on(&#39;click&#39;,&#39;.ss&#39;,function(){
var id = $(this).attr(&#39;id&#39;);
var con = $(this).text();
$(this).parent().html("<input type=&#39;text&#39; id=&#39;"+id+"&#39; class=&#39;aa&#39; value=&#39;"+con+"&#39;>");
$(&#39;.aa&#39;).val(&#39;&#39;).focus().val(con);
$(document).on(&#39;blur&#39;,&#39;.aa&#39;,function(){
var id = $(this).attr(&#39;id&#39;);
var cons = $(this).val();
$(this).parent().html("<span id=&#39;"+id+"&#39; class=&#39;ss&#39;>"+cons+"</span>");
$.ajax({
type: "POST",
url: "<?php echo site_url(&#39;Welcome/upd_ji&#39;)?>",
data: "id="+id+"&cons="+cons
})
})
})
//导出
$(document).on(&#39;click&#39;,&#39;#chu&#39;,function(){
var sou = $(&#39;#sou&#39;).val();
location.href="<?php echo site_url(&#39;excel/export&#39;)?>?sou="+sou;
})
//ajax分页（控制层）
public function ajax_page(){
$sou = $this->input->post(&#39;sou&#39;);
$count = $this->db->where("name like &#39;%$sou%&#39;")->count_all_results("peng");
$number = 3;
$this->session->set_userdata(&#39;number&#39;,$number);
$pagecount = ceil($count/$number);
@$page = $_POST[&#39;page&#39;]?$_POST[&#39;page&#39;]:1;
$this->session->set_userdata(&#39;page&#39;,$page);
$start = ($page-1)*$number;
$arr[&#39;list&#39;] = $this->db->where("name like &#39;%$sou%&#39;")->limit($number,$start)->get("peng")->result_array();
$up_page = $page-1<1?1:$page-1;
$down_page = $page+1>$pagecount?$pagecount:$page+1;
$str = "";
$str .= "<a href=&#39;javascript:void(0)&#39; onclick=&#39;ajax_page($up_page)&#39;>上一页</a>";
for($i=1;$i<=$pagecount;$i++){
if($i==$page){
$str .= "--"."<b>$i</b>";
}else{
$str .= "--"."<a href=&#39;javascript:void(0)&#39; onclick=&#39;ajax_page($i)&#39;>$i</a>";
}
}
$str .= "--"."<a href=&#39;javascript:void(0)&#39; onclick=&#39;ajax_page($down_page)&#39;>下一页</a>";
$arr[&#39;pagestr&#39;] = $str;
echo json_encode($arr);
}
//状态切换
public function upds(){
$id = $this->input->post(&#39;id&#39;);
$arr = $this->db->get_where("peng","id=&#39;$id&#39;")->row_array();
if($arr[&#39;state&#39;]==0){
$data[&#39;state&#39;]=1;
$this->db->where("id=&#39;$id&#39;")->update("peng",$data);
echo "1";
}else{
$data[&#39;state&#39;]=0;
$this->db->where("id=&#39;$id&#39;")->update("peng",$data);
echo "2";
}
}
//批量删除
public function pdels(){
$str = $this->input->post(&#39;new_str&#39;);
$this->db->where("id in($str)")->delete("peng");
}