jquery php json 表单自动填充代码

这种表单自动完成功能，像百度，google,淘宝他们的搜索功能都有，在用户输入一部要的内容时会根据条件显示相关内容。

<script>
;(function($){
/* plugin */
$.fn.autocomplete=function(o){
    if(o.ajax) o.ajax=$.extend({ url:'', datatype:'json', async:true }, o.ajax||{});
    o.elemcss教程=$.extend({ focus:{'color':'#f00'}, blur:{'color':'#000'} }, o.elemcss||{});
    o=$.extend({
        source:null,/* privide an array for match */
        ajax:{},/* provide an ajax conditions, if source is exist this parameter is invalid */
        input:'input',/* provide the selector of input box */
        popup:'ul',/* provide the selector of popup box, it must be a ul element of html */
        elemcss:{}/* provide the focus and blur css objects of items in the popup box */
    },o||{});

    var handler=(function(){
        var handler=function(e,o){ return new handler.prototype.init(e,o); };
        handler.prototype={
            e:null, o:null, timer:null, show:0, $input:null, $popup:null,
            init:function(e,o){
                this.e=e;
                this.o=o;
                this.$input=$(this.o.input,this.e);
                this.$popup=$(this.o.popup,this.e);
                this.initevent();
            },
            match:function(quickexpr,value,source){
                for(var i in source){
                    if( value.length>0 && quickexpr.exec(source[i])!=null )
                        this.$popup.append('<li><a href="网页特效:;">'+source[i]+'</a></li>');
                }
                if($('li a',this.$popup[0]).length){ this.$popup.show(); }else{ this.$popup.hide(); }
            },
            fetch:function(ajax,search,quickexpr){
                var that=this;
                $.ajax({
                    url: ajax.url+search,
                    datatype: ajax.datatype,
                    async: ajax.async,
                    error: function(data,es,et){ alert('error'); },
                    success: function(data){ that.match(quickexpr,search,data); }
                });
            },
            initevent:function(){
                var that=this;
                this.$input.focus(function(){
                    var value=this.value, quickexpr=regexp('^'+value,'i'), self=this;
                    that.timer=setinterval(function(){
                        if(value!=self.value){
                            value=self.value;
                            that.$popup.html('');
                            if(value!=''){
                                quickexpr=regexp('^'+value);
                                if(that.o.source) that.match(quickexpr,value,that.o.source);
                                else if(that.o.ajax) that.fetch(that.o.ajax,value,quickexpr);
                            }
                        }
                    },200);
                }).blur(function(){
                    clearinterval(that.timer);
                    var current=-1;
                    var len=that.$popup.find("li a").length-1;
                    $("li a",that.$popup[0]).click(function(){
                        that.$input[0].value=$(this).text();
                        that.$popup.html('').hide();
                    }).focus(function(){
                        current = $(this).parent().index();
                        $(this).css(that.o.elemcss.focus);
                    }).blur(function(){
                        $(this).css(that.o.elemcss.blur);
                    });
                    $("li a",that.$popup[0]).keydown(function(event){
                        if(event.keycode==40){
                            current++;
                            if(current<0) current=len;
                            if(current>len) current=0;
                            that.$popup.find("li a").get(current).focus();
                        }else if(event.keycode==38){
                            current--;
                            if(current>len) current=0;
                            if(current<0) current=len;
                            that.$popup.find("li a").get(current).focus();
                        }
                    });
                }).keydown(function(event){
                    if(event.keycode==40){
                        that.$popup.blur().find("li a").get(0).focus();
                    }
                });
                $(this.e).hover(function(){ that.show=1; },function(){ that.show=0; });
                $(document).click(function(){ if(that.show==0){ that.$popup.hide(); } });
            }
        };
        handler.prototype.init.prototype=handler.prototype;/* jquery style */
        return handler;
    })();

    return this.each(function(){ handler(this,o); });
};
/* invoke */
$(document).ready(function(){
    $(".autocomplete").autocomplete({
        source:[123,1234,43563,12346,3464564,3454,7567,956,456,9383,893,999],
        //ajax:{ url:'./php教程/fetch.php?search=', datatype:'json', async:false },
        elemcss:{ focus:{'color':'#0f0'}, blur:{'color':'#f00'} }
    });
});
/* conclude */
})(jquery);

</script>

php代码

<?php
class datafetch{   
private $conn, $rs;   
function __construct(){       
$this->conn = mysql教程_connect("localhost","root","pwd") or die("cant't connect host~");        mysql_select_db("studentinfo",$this->conn) or die("cant't select database~");    }   
public function data_list($s){       
$this->rs=mysql_query("select sno from student where sno like '$s%'") or die("can't fetch~");       
$datalist=array();       
while($row = mysql_fetch_array($this->rs,mysql_assoc))
{               
array_push($datalist,$row);      
 }       
 return $datalist;    }}
 $search= isset($argv[1]) ? $argv[1] :   ( isset($_get['search']) ? $_get['search'] : '' ) ;
 $fetch=new datafetch();
 $data=$fetch->data_list($search);
 echo '[';
 foreach ($data as $key=>$value)
 {    echo "nt";   
 echo '"'.$value['sno'].'"';   
 if( $key!=count($data)-1 ) echo ','; else echo "n";}echo "]n";
 ?>
 

 这里是利用了php mysql返回json数据，因为上面的jquery也是分析json数据来处的，因为json数据比较实时小而快，所以很多时候都用它了。