基于jquery实现的自动补全功能

本文实例讲述了基于jquery实现的自动补全功能的方法。分享给大家供大家参考。具体实现方法如下：

$(function() {

    // 自动补全

    var maxcount = 0;// 表示他最大的值

    var thisCount =0;// 初始化他框的位置

    $("body").prepend("<div style='width:120px; display:none; background:#FFFFFF; position: absolute;' id='autoTxt'></div>");

    $("#sele").keyup(function(even) {

        var v = even.which;

        if (v == 38 || v == 40 || v == 13)// 当点击上下键或者确定键时阻止他传送数据

            {

            return;

            }

        var txt = $("#sele").val();//这里是取得他的输入框的值

        if (txt != "") {

            //拼装数据

            $.ajax({

                url : "Birthday_autoCompletion",//从后台取得json数据

                type : "post",

                dataType : "json",

                data : {"bir.userName" : txt

                },

                success : function(ls) {

                    var offset = $("#sele").offset();

                    $("#autoTxt").show();

                    $("#autoTxt").css("top", (offset.top + 30) + "px");

                    $("#autoTxt").css("left", offset.left + "px");

                    var Candidate = "";

                     maxcount = 0;//再重新得值

                    $.each(ls, function(k, v) {

                        Candidate += "<li id='" +maxcount+ "'>" + v + "</li>";

                        maxcount++;

                    });

                    $("#autoTxt").html(Candidate);

                    $("#autoTxt li:eq(0)").css("background", "#A8A5A5");

                    //高亮对象

                    $('body').highLight();

                    $('body').highLight($("#sele").val());

                    event.preventDefault();

                        //当单击某个ＬＩ时反映

                        $("#autoTxt li").click(function(){

                            $("#sele").val($("#autoTxt li:eq("+this.id+")").text());

                            $("#autoTxt").html("");

                            $("#autoTxt").hide();

                        });

                        //移动对象

                        $("#autoTxt li").hover(function(){

                            $("#autoTxt li").css("background", "#FFFFFF");

                            $("#autoTxt li:eq("+this.id+")").css("background", "#A8A5A5");

                            thisCount=this.id;},function(){

                                $("#autoTxt li").css("background", "#FFFFFF");});

                },

                error : function() {

                    $("#autoTxt").html("");

                    $("#autoTxt").hide();

                    maxcount = 0;

                }

            });

        } else {

            $("#autoTxt").hide();

            maxcount = 0;

            $("#sestart").click();

        }

    });

    //当单击ＢＯＤＹ时则隐藏搜索值

    $("body").click(function(){

        $("#autoTxt").html("");

        $("#autoTxt").hide();

        thisCount=0;

    });

    // 写移动事件//上键３８ 下键４０ 确定键 １３

    $("body").keyup(function(even) {

        var v = even.which;

            if (v == 38)// 按上键时

            {

                if(thisCount!=0){//等于零时则证明不能上了。所以获得焦点

                    $("#sele").blur();

                    if(thisCount>0)

                        --thisCount;

                    else

                        thisCount=0;

                $("#autoTxt li").css("background", "#FFFFFF");

                $("#autoTxt li:eq("+thisCount+")").css("background", "#A8A5A5");

                }else{$("#sele").focus();}

            } else if (v == 40) {// 按下键时

                if(thisCount<maxcount-1)

                {

                    $("#sele").blur();

                    ++thisCount;

                    $("#autoTxt li").css("background", "#FFFFFF");

                    $("#autoTxt li:eq("+thisCount+")").css("background", "#A8A5A5");

                }

            } else if (v == 13) {// 按确认键时

                var tt=$("#"+thisCount).text();

                if(tt!="")

                    {

                        $("#sele").val(tt);

                        $("#autoTxt").html("");

                        $("#autoTxt").hide();

                    }else

                    {

                        if($("#sele").val()!="")

                        $("#sestart").click();

                    }

            } else {

                if($("#autoTxt").html()!="")

                    {

                        $("#sele").focus();

                        thisCount=0;

                    }

            }

    });

});

希望本文所述对大家的jQuery程序设计有所帮助。