zoukankan html css js c++ java

Jquery实现搜索框提示功能

博客的前某一篇文章中http://www.cnblogs.com/hEnius/p/2013-07-01.html写过一个用Ajax来实现一个文本框输入的提示功能。最近在一个管理项目的项目中，使用后发现，真的反应很慢，数据量很大的情况下使用Ajax去实现真的不合适，于是，我又写了一个使用Jquery来实现方法。

废话不多说，上图上代码:

引用方式：

<body style="background-color: White;">
    <form id="form1" runat="server">
    <div id="filter_stationType"></div>
    <div class="gover_search" width="100%">
        <div class="gover_search_form clearfix" width="100%">
            <span class="search_t"><b>按项目名称检索：</b></span>
　　　　　　　 <%--autocomplete="off" 这个设置是禁止浏览器自动完成提示功能（就是历史记录自动提示）--%> 
<asp:TextBox ID="search" runat="server" CssClass="input_search_key" Width="240px" autocomplete="off"></asp:TextBox> <asp:Button ID="btnSearchProject" runat="server" CssClass="search_btn" Text="查询" OnClick="btnSearchProject_Click" /> <div class="search_suggest" id="gov_search_suggest"> <ul> </ul> </div> </div> </div> </form> </body>

JS代码：

<script type="text/javascript"> 
    //实现搜索输入框的输入提示js类
    var oSearchSuggest = function(searchFuc) {
        //     function oSearchSuggest(searchFuc) {
        var searchsubmit = $('#btnSearchProject');
        var input = $('#search');
        var suggestWrap = $('#gov_search_suggest');
        var key = "";
        var init = function() {
            input.bind('keyup', sendKeyWord);
            input.bind('blur', function() { setTimeout(hideSuggest, 100); })
        }
        var hideSuggest = function() {
            suggestWrap.hide();
        }

        //发送请求，根据关键字到后台查询
        var sendKeyWord = function(event) {

            //键盘选择下拉项
            if (suggestWrap.css('display') == 'block' && event.keyCode == 38 || event.keyCode == 40) {
                var current = suggestWrap.find('li.hover');
                if (event.keyCode == 38) {
                    if (current.length > 0) {
                        var prevLi = current.removeClass('hover').prev();
                        if (prevLi.length > 0) {
                            prevLi.addClass('hover');
                            input.val(prevLi.html());
                        }
                    } else {
                        var last = suggestWrap.find('li:last');
                        last.addClass('hover');
                        input.val(last.html());
                    }

                } else if (event.keyCode == 40) {
                    if (current.length > 0) {
                        var nextLi = current.removeClass('hover').next();
                        if (nextLi.length > 0) {
                            nextLi.addClass('hover');
                            input.val(nextLi.html());
                        }
                    } else {
                        var first = suggestWrap.find('li:first');
                        first.addClass('hover');
                        input.val(first.html());
                    }
                }

                //输入字符
            } else {
                var valText = $.trim(input.val());
                if (valText == '' || valText == key) {
                    return;
                }
                searchFuc(valText);
                key = valText;
            }

        }
        //请求返回后，执行数据展示
        this.dataDisplay = function(data) {
            if (data.length <= 0) {
                suggestWrap.hide();
                return;
            }

            //往搜索框下拉建议显示栏中添加条目并显示
            var li;
            var tmpFrag = document.createDocumentFragment();
            suggestWrap.find('ul').html('');
            for (var i = 0; i < data.length; i++) {
                li = document.createElement('LI');
                li.innerHTML = data[i];
                tmpFrag.appendChild(li);
            }
            suggestWrap.find('ul').append(tmpFrag);
            suggestWrap.show();

            //为下拉选项绑定鼠标事件,实现鼠标点击选取
            suggestWrap.find('li').hover(function() {
                suggestWrap.find('li').removeClass('hover');
                $(this).addClass('hover');

            }, function() {
                $(this).removeClass('hover');
            }).bind('mousedown', function() {
                input.val(this.innerHTML);
                suggestWrap.hide();
                searchsubmit.click();

            });
        }
        init();
    };

    //实例化输入提示的JS,参数为进行查询操作时要调用的函数名

    var searchSuggest = new oSearchSuggest(sendKeyWordToBack);

    //这是一个模似函数，实现向后台发送ajax查询请求，并返回一个查询结果数据，传递给前台的JS,再由前台JS来展示数据。本函数由程序员进行修改实现查询的请求
    //参数为一个字符串，是搜索输入框中当前的内容
    function sendKeyWordToBack(keyword) {
        var sSearchKey = $("#search").val();
        $("#search").bind("input propertychange", function(event) {
            sSearchKey = $("#search").val();
        });
        $.ajax({
            url: "WebService/wbsBLL.asmx/GetSearchInfo",    //后台webservice里的方法名称根据自己需要实现返回数据位json
            type: "POST",
            dataType: "json",
            async: false,
            contentType: "application/json; charset=utf-8",
            data: '{"sKeyName":"' + sSearchKey + '"}',
            traditional: false,
            beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); },
            success: function(data) {

            var aData = [];
                for (var i in data) {
                    var jsonObj = $.parseJSON(data[i]);
                    for (var item in jsonObj) {
                        jsonObj = eval(jsonObj.SeachTable);
                        for (var i = 0; i < jsonObj.length; i++) {

                            if (jsonObj[i].projectName != "") {
                                aData.push(jsonObj[i].projectName);
                            }
                        }
                    }
                }
                searchSuggest.dataDisplay(aData);
            },
            error: function(msg, e) {
                $("#filter_stationType").html("SQL语句有错误");
            },

            complete: function(x) {
            }

        });
    }

</script>

index.css:

@charset "utf-8";
/* CSS Document */

body, ul, li {
    margin: 0;
    padding: 0;
}
body{ 
    font-size:12px; 
    font-family:sumsun,arial;
    color:#666666;
    background:#FFFFFF;
}

#searchtable{background:#E4E9F2; border-bottom:1px solid #C8CFDA; padding:0px 8px;height: 33px;}
#searchtable label{font-size:14px; display:inline-block; float:left; color:#333; text-shadow:1px 1px 0px #EBF5FA; font-weight:bold; padding:10px 0 8px 16px; background:url(../images/pemIcons.png) 2px -34px no-repeat; _background:url(../images/pemIcons.gif) 2px -34px no-repeat;}
#searchtable #search{border: 1px solid #C3C3C3; border-top: 1px solid #7C7C7C; border-left: 1px solid #9A9A9A;background: url(../images/today.gif) 0 -162px white repeat-x;outline: none; padding:3px 4px; _padding:3px 4px 5px; display:inline-block; float:left; margin:6px 12px 4px 0; zoom:1;}
#searchtable .btnSubmit{margin-top:6px;margin-left:5px; zoom:1; border: 1px solid #236300; background: #6B9F40 url(../images/buttonbg01.png) repeat-x 0 0; font-size:12px; color:#FFF; line-height:24px; height:24px; 60px; font-weight:bold; display:block; text-align:center; float:left;}
#searchtable .btnSubmit:hover{text-decoration:none; background-position:0 -32px;}
#searchtable .btnSubmit:active{background-position:0 -64px;}
#searchtable .fBtn:hover{color:#000;}
table.datagrid {
    border:1px solid #DDDDDD;
    border-collapse:collapse;
}




.gover_search{ position:relative; z-index:99; height:33px; padding:15px 0 0 20px; border:1px solid #b8cfe6; border-bottom:0; background:#E4E9F2;border-bottom:1px solid #C8CFDA;}
.gover_search_form{height:36px;}
.gover_search .search_t{ float:left; 112px; line-height:26px; color:#666666;}
.gover_search .input_search_key{ float:left; 462px; height:18px; padding:3px; margin-right:5px; border:1px solid #cccccc; line-height:18px; background:#FFFFFF;}
.gover_search .search_btn{ padding-left:4px; 68px; height:26px; overflow:hidden; border:1px solid #cccccc; text-align:center; color:#ffffff; letter-spacing:5px; background: #6B9F40 url(../images/buttonbg01.png) repeat-x 0 0; cursor:pointer; font-weight:bold;}
.gover_search .search_suggest{ position:absolute; z-index:999; left:132px; top:41px; 468px; border:1px solid #999999; display:none; }
.gover_search .search_suggest li{height:24px; overflow:hidden; padding-left:3px; line-height:24px; background:#FFFFFF; cursor:default;}
.gover_search .search_suggest li.hover{background:#DDDDDD;}

后台的webservice代码这里就不展示了，主要就是查询数据库返回一个JSON格式的查询结果给Jquery中的Data

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原文地址：https://www.cnblogs.com/hEnius/p/2013-8-05_autopromption.html