JavaScript 制作带自动提示的文本框

9-10.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Ajax实现自动提示的文本框</title>
<style>

</style>
<script language="javascript">
var oInputField;    //考虑到很多函数中都要使用
var oPopDiv;        //因此采用全局变量的形式
var oColorsUl;
var xmlHttp;
function createXMLHttpRequest(){
    if(window.ActiveXObject)
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    else if(window.XMLHttpRequest)
        xmlHttp = new XMLHttpRequest();
}
function initVars(){
    //初始化变量
    oInputField = document.forms["myForm1"].colors;
    oPopDiv = document.getElementById("popup");
    oColorsUl = document.getElementById("colors_ul");
}
function clearColors(){
    //清除提示内容
    for(var i=oColorsUl.childNodes.length-1;i>=0;i--)
        oColorsUl.removeChild(oColorsUl.childNodes[i]);
    oPopDiv.className = "hide";
}
function setColors(the_colors){
    //显示提示框，传入的参数即为匹配出来的结果组成的数组
    clearColors();    //每输入一个字母就先清除原先的提示，再继续
    oPopDiv.className = "show";
    var oLi;
    for(var i=0;i<the_colors.length;i++){
        //将匹配的提示结果逐一显示给用户
        oLi = document.createElement("li");
        oColorsUl.appendChild(oLi);
        oLi.appendChild(document.createTextNode(the_colors[i]));

        oLi.onmouseover = function(){
            this.className = "mouseOver";    //鼠标经过时高亮
        }
        oLi.onmouseout = function(){
            this.className = "mouseOut";    //离开时恢复原样
        }
        oLi.onclick = function(){
            //用户点击某个匹配项时，设置输入框为该项的值
            oInputField.value = this.firstChild.nodeValue;
            clearColors();    //同时清除提示框
        }
    }
}
function findColors(){
    initVars();        //初始化变量
    if(oInputField.value.length > 0){
        createXMLHttpRequest();        //将用户输入发送给服务器
        var sUrl = "9-10.aspx?sColor=" + oInputField.value + "&timestamp=" + new Date().getTime();
        xmlHttp.open("GET",sUrl,true);
        xmlHttp.onreadystatechange = function(){
            if(xmlHttp.readyState == 4 && xmlHttp.status == 200){
                var aResult = new Array();
                if(xmlHttp.responseText.length){
                    aResult = xmlHttp.responseText.split(",");
                    setColors(aResult);    //显示服务器结果
                }
                else
                    clearColors();
            }
        }
        xmlHttp.send(null);
    }
    else
        clearColors();    //无输入时清除提示框（例如用户按del键）
}
</script>
</head>
<body>
<form method="post" name="myForm1">
Color: <input type="text" name="colors" id="colors" onkeyup="findColors();" />
</form>
<div id="popup">
    <ul id="colors_ul"></ul>
</div>
</body>
</html>

9-10.aspx

<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" %>
<%@ Import Namespace="System.Data" %>
<%
    Response.CacheControl = "no-cache";
    Response.AddHeader("Pragma","no-cache");
    string sInput = Request["sColor"].Trim();
    if(sInput.Length == 0)
        return;
    string sResult = "";

    string[] aColors = new string[]{"aliceblue","antiquewith","aquamarine","azure","beige","bisque","black","blanchedalmond","blue","blueviolet","brass","bronze","brown","burlywood","cadetblue","chartreuse","chocolate","copper","coral","cornfloewrblue","cornsilk","cyan","darkblue","darkcyan","darkgoldenrod","darkgray","darkgreen","darkhaki","darkmagenta","darkolivegreen","darkorchid","darkorenge","darkred","darksalmon","darkseagreen","darkslateblue","darkslategray","darkturquoise","darkviolet","deeppink","deepskyblue","dimgray","dodgerblue","feldspar","firebrick","floralwhite","forestgreen","fuchsia","gainsboro","gold","goldenrod","golenrod","gostwhite","gray","green","greenyellow","honeydew","hotpink","indianred","inen","ivory","khaki","lavender","lavenderblush","lawngreen","lemonchiffon","lightblue","lightcoral","lightcyan","lightgodenrod","lightgodenrodyellow","lightgray","lightgreen","lightpink","lightsalmon","lightseagreen","lightskyblue","lightslateblue","lightslategray","lightsteelblue","lightyellow","lime","limegreen","magenta","magenta","maroom","maroon","mediumaquamarine","mediumblue","mediumorchid","mediumpurpul","mediumseagreen","mediumslateblue","mediumspringgreen","mediumturquoise","mediumvioletred","midnightblue","mintcream","mistyrose","moccasin","navajowhite","navy","navyblue","oldlace","olivedrab","orange","orchid","orengered","palegodenrod","palegreen","paleturquoise","palevioletred","papayawhip","peachpuff","peru","pink","plum","powderblue","purple","quartz","red","rosybrown","royalblue","saddlebrown","salmon","sandybrown","scarlet","seagreen","seashell","sienna","silver","skyblue","slategray","snow","springgreen","steelblue","tan","thistle","tomato","turquoise","violet","violetred","wheat","whitesmoke","yellow","yellowgreen"};

    for(int i=0;i<aColors.Length;i++){
        if(aColors[i].IndexOf(sInput) == 0)
            sResult += aColors[i] + ",";
    }
    if(sResult.Length>0)                                    //如果有匹配项
        sResult = sResult.Substring(0,sResult.Length-1);    //去掉最后的“,”号
    Response.Write(sResult);
%>

14-10.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>jQuery实现自动提示的文本框</title>
<style>

</style>
<script language="javascript" src="jquery.min.js"></script>
<script language="javascript">
var oInputField;    //考虑到很多函数中都要使用
var oPopDiv;        //因此采用全局变量的形式
var oColorsUl;
function initVars(){
    //初始化变量
    oInputField = $("#colors");
    oPopDiv = $("#popup");
    oColorsUl = $("#colors_ul");
}
function clearColors(){
    //清除提示内容
    oColorsUl.empty();
    oPopDiv.removeClass("show");
}
function setColors(the_colors){
    //显示提示框，传入的参数即为匹配出来的结果组成的数组
    clearColors();    //每输入一个字母就先清除原先的提示，再继续
    oPopDiv.addClass("show");
    for(var i=0;i<the_colors.length;i++)
        //将匹配的提示结果逐一显示给用户
        oColorsUl.append($("<li>"+the_colors[i]+"</li>"));
    oColorsUl.find("li").click(function(){
        oInputField.val($(this).text());
        clearColors();
    }).hover(
        function(){$(this).addClass("mouseOver");},
        function(){$(this).removeClass("mouseOver");}
    );
}
function findColors(){
    initVars();        //初始化变量
    if(oInputField.val().length > 0){
        //获取异步数据
        $.get("14-10.aspx",{sColor:oInputField.val()},
            function(data){
                var aResult = new Array();
                if(data.length > 0){
                    aResult = data.split(",");
                    setColors(aResult);    //显示服务器结果
                }
                else
                    clearColors();
        });
    }
    else
        clearColors();    //无输入时清除提示框（例如用户按del键）
}
</script>
</head>
<body>
<form method="post" name="myForm1">
Color: <input type="text" name="colors" id="colors" onkeyup="findColors();" />
</form>
<div id="popup">
    <ul id="colors_ul"></ul>
</div>
</body>
</html>

14-10.aspx

<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" %>
<%@ Import Namespace="System.Data" %>
<%
    Response.CacheControl = "no-cache";
    Response.AddHeader("Pragma","no-cache");
    string sInput = Request["sColor"].Trim();
    if(sInput.Length == 0)
        return;
    string sResult = "";

    string[] aColors = new string[]{"aliceblue","antiquewith","aquamarine","azure","beige","bisque","black","blanchedalmond","blue","blueviolet","brass","bronze","brown","burlywood","cadetblue","chartreuse","chocolate","copper","coral","cornfloewrblue","cornsilk","cyan","darkblue","darkcyan","darkgoldenrod","darkgray","darkgreen","darkhaki","darkmagenta","darkolivegreen","darkorchid","darkorenge","darkred","darksalmon","darkseagreen","darkslateblue","darkslategray","darkturquoise","darkviolet","deeppink","deepskyblue","dimgray","dodgerblue","feldspar","firebrick","floralwhite","forestgreen","fuchsia","gainsboro","gold","goldenrod","golenrod","gostwhite","gray","green","greenyellow","honeydew","hotpink","indianred","inen","ivory","khaki","lavender","lavenderblush","lawngreen","lemonchiffon","lightblue","lightcoral","lightcyan","lightgodenrod","lightgodenrodyellow","lightgray","lightgreen","lightpink","lightsalmon","lightseagreen","lightskyblue","lightslateblue","lightslategray","lightsteelblue","lightyellow","lime","limegreen","magenta","magenta","maroom","maroon","mediumaquamarine","mediumblue","mediumorchid","mediumpurpul","mediumseagreen","mediumslateblue","mediumspringgreen","mediumturquoise","mediumvioletred","midnightblue","mintcream","mistyrose","moccasin","navajowhite","navy","navyblue","oldlace","olivedrab","orange","orchid","orengered","palegodenrod","palegreen","paleturquoise","palevioletred","papayawhip","peachpuff","peru","pink","plum","powderblue","purple","quartz","red","rosybrown","royalblue","saddlebrown","salmon","sandybrown","scarlet","seagreen","seashell","sienna","silver","skyblue","slategray","snow","springgreen","steelblue","tan","thistle","tomato","turquoise","violet","violetred","wheat","whitesmoke","yellow","yellowgreen"};

    for(int i=0;i<aColors.Length;i++){
        if(aColors[i].IndexOf(sInput) == 0)
            sResult += aColors[i] + ",";
    }
    if(sResult.Length>0)                                    //如果有匹配项
        sResult = sResult.Substring(0,sResult.Length-1);    //去掉最后的“,”号
    Response.Write(sResult);
%>