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                jquery-lib版本是 1.3.2的,該插件是簡單的擴展插件,代碼也比較簡單的封裝。所以看起來也比較簡單不是很費力,當然封裝得也不是很好。 不過做了瀏覽器方面的兼容,經測試兼容IE6+、Firefox3.5+ 首先看看autocomplete.js: ~~~ ;(function ($) { var index = -1; var timeId; var cssOptions = { "border": "1px solid black", "background-color": "white", "position": "absolute"/*, "font": "normal normal lighter 14px 6px Times New Roman"*/ }; var defaults = { width: "auto", highlightColor: "#3399FE", unhighlightColor: "#FFFFFF", css: cssOptions, dataType: "xml", paramName: "word", delay: 500, max: 20 }; var keys = { UP: 38, DOWN: 40, DEL: 46, TAB: 9, ENTER: 13, ESC: 27, /*COMMA: 188,*/ PAGEUP: 33, PAGEDOWN: 34, BACKSPACE: 8, A: 65, Z: 90 }; $.fn.extend({ autocomplete: function (sUrl, settings) { sUrl = (typeof sUrl === "string") ? sUrl : ""; var param = !this.attr("id") ? defaults.paramName : this.attr("id"); settings = $.extend({}, defaults, {url: sUrl, paramName: param}, settings); var autoTip = this.autoTipTemplate(this, settings); $("body").append(autoTip); var $this = this; this.keyup(function (event) { $this.keyOperator(event, autoTip, settings); }); /*$("input[type=button]").click(function () { $("#result").text("文本框中的【" + search.val() + "】被提交了!"); $("#auto").hide(); index = - 1; });*/ return this.each(function () { $this.val(); }); }, autoTipTemplate: function (input, settings) { var inputOffset = input.offset(); var autoTip = $("<div/>").css(settings.css).hide() .css("top", inputOffset.top + input.height() + 5 + "px") .css("left", inputOffset.left + "px"); var space = $.browser.mozilla ? 2 : 6;//兼容瀏覽器 var tipWidth = (typeof settings.width === "string" && "auto") ? input.width() : settings.width; autoTip.width(tipWidth + space + "px"); return autoTip; }, select: function (target, index, settings, flag) { var color = flag ? settings.highlightColor : settings.unhighlightColor; target.children("div").eq(index).css("background-color", color); }, keyOperator: function (event, autoTip, settings) { var evt = event || window.event; var autoNodes = autoTip.children("div"); var kc = evt.keyCode; var $this = this; /* 當用戶按下字母或是delete 或是退格鍵*/ if (kc >= keys.A && kc <= keys.Z || kc == keys.BACKSPACE || kc == keys.DEL) { var wordText = this.val(); if (wordText.length != 0) { var param = {}; param[settings.paramName] = wordText; clearTimeout(timeId); timeId = setTimeout(function () { $.post(settings.url, param, function (data) { var wordObj = $(data); if (settings.dataType == "xml") { var wordNodes = wordObj.find("word"); autoTip.html(""); wordNodes.each(function (i) { var divNode = $("<div>").attr("id", i); //將遍歷的單詞加入到創建的div中,然后把該div追加到auto中 divNode.html($(this).text()).appendTo(autoTip); //鼠標已進去,添加高亮 divNode.mousemove(function () { //如果已經存在高亮,去掉高亮改為白色 if (index != -1) { autoTip.children("div").eq(index).css("background-color", settings.unhighlightColor); } index = $(this).attr("id"); $(this).css("background-color", settings.highlightColor); }); //鼠標移出,取消高亮 divNode.mouseout(function () { $(this).css("background-color", settings.unhighlightColor); }); //點擊高亮內容 divNode.click(function () { $this.val($(this).text()); index = -1; autoTip.hide(); }); }); if (wordNodes.length > 0) { autoTip.show(); } else { autoTip.hide(); index = -1; } } }); }, settings.delay); } else { autoTip.hide(); index = -1; } } else if (kc == keys.UP || kc == keys.DOWN) {/*當用戶按下上下鍵*/ if (kc == keys.UP) {//向上 if (index != -1) { autoNodes.eq(index).css("background-color", settings.unhighlightColor); index--; } else { index = autoNodes.length - 1; } if (index == -1) { index = autoNodes.length - 1; } autoNodes.eq(index).css("background-color", settings.highlightColor); } else {//向下 if (index != -1) { autoNodes.eq(index).css("background-color", settings.unhighlightColor); } index++; if (index == autoNodes.length) { index = 0; } autoNodes.eq(index).css("background-color", settings.highlightColor); } } else if (kc == keys.PAGEUP || kc == keys.PAGEDOWN) { event.preventDefault(); if (kc == keys.PAGEUP) { if (index != -1) { autoNodes.eq(index).css("background-color", settings.unhighlightColor); } if (autoNodes.length > 0) { index = 0; autoNodes.eq(0).css("background-color", settings.highlightColor); } } else { if (index != -1) { autoNodes.eq(index).css("background-color", settings.unhighlightColor); } index = autoNodes.length - 1; autoNodes.eq(index).css("background-color", settings.highlightColor); } } else if (kc == keys.ENTER) { //回車鍵 //有高亮內容就補全信息 if (index != -1) { $this.val(autoNodes.eq(index).text()); } else {//沒有就隱藏 $("body").append($("<div/>").text("文本框中的【" + $this.val() + "】被提交了!")); $this.get(0).blur(); } autoTip.hide(); index = -1; } else if (kc == keys.ESC) { autoTip.hide(); } } }); })(jQuery); ~~~ 現在來分析上面的autocomplete插件的一些常用選項: index就是選擇提示選項高亮的索引; timeId是當用戶在文本域輸入時,利用setTimeout進行ajax請求服務器獲得數據的而返回的時間; cssOptions是自動提示選項的樣式,這里給出了一些默認的樣式; ~~~ var defaults = { ??????? width: "auto",//默認或自動設置寬度 ??????? highlightColor: "#3399FE",//高亮時的顏色 ??????? unhighlightColor: "#FFFFFF",//非高亮時的顏色 ??????? css: cssOptions, ??????? dataType: "xml",//ajax請求返回數據類型 ??????? paramName: "word",//ajax請求的參數名稱,如果你有設置文本域的id,那么就使用這個屬性 ??????? delay: 500,//當文本域在不停的輸入時,ajax多久請求一次服務器 ??? }; ~~~ keys就是鍵盤鍵對應的值; autocomplete就是調用的函數,可以在里面設置ajax請求的url,以及配置上面defaults中出現的參數,這個方法返回的是文本域的值; autoTipTemplate就是輸入時顯示的提示框、提示菜單,返回的是一個jquery對象; select是選擇提示菜單也就是下來提示菜單的高亮選項,target當然是目標對象了,index是即將被高亮的選項的索引,settings就是 高亮的顏色配置,這個在默認defaults中就有的。是通過$.extend方法將defaults對象的屬性賦值給settings對象的; keyOperator是針對文本域的鍵盤操作,這個是核心函數;操作提示、自動補全就靠它了; ? 下面看看html代碼,看看是如何調用autocomplete插件的: ~~~ <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Ajax示例,實現Google搜索補全功能</title> <meta http-equiv="author" content="hoojo"> <meta http-equiv="email" content="hoojo_@126.com"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <script type="text/javascript" src="jslib/jquery-1.3.2.min.js"></script> <script type="text/javascript" src="jslib/jquery.autocomplete-1.2.js"></script> <script type="text/javascript"> $(function () { $(":text").autocomplete("AutocompleteWordServlet", {dataType: "xml", width: "auto"}); }); </script> </head> <body> 請輸入:<input type="text" /> <input type="button" value="Go" /><br/><br/> </body> </html> ~~~ ? 看看這段代碼AutocompleteWordServlet是請求的Servlet,dataType是ajax請求服務器端的返回數據的類型,width可以設置自動提示菜單的寬度。 怎么樣,用法比較簡單吧。當然后面你還可以加其他的配置,如: 代碼片段 ~~~ $(":text").autocomplete("AutocompleteWordServlet", { width: "auto", highlightColor: "#3355FE", unhighlightColor: "#FFFFcc", css: {border: "2px solid red"}, dataType: "xml", paramName: "keyWord", delay: 300 }); ~~~ 這樣也是可以的; 看看AutocompleteWordServlet的代碼: ~~~ package com.hoo.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @SuppressWarnings("serial") public class AutocompleteWordServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String word = request.getParameter("word"); request.setAttribute("word", word); //System.out.println(word); request.getRequestDispatcher("word.jsp").forward(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } } ~~~ 沒什么可說的,就是獲取客戶端文本域的ajax請求的關鍵字,然后在jsp頁面中進行單詞過濾。不過你也可以在客戶端用正則 或是在服務器端用正則過濾都是可以的。 下面看看word.jsp的內容: ~~~ <%@ page language="java" contentType="text/xml; charset=UTF-8" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> <words> <c:if test="${fn:startsWith('abstruct', word)}"> <word>abstruct</word> </c:if> <c:if test="${fn:startsWith('anilazine', word)}"> <word>anilazine</word> </c:if> <c:if test="${fn:startsWith('appeared', word)}"> <word>appeared</word> </c:if> <c:if test="${fn:startsWith('autocytolysis', word)}"> <word>autocytolysis</word> </c:if> <c:if test="${fn:startsWith('apple', word)}"> <word>apple</word> </c:if> <c:if test="${fn:startsWith('boolean', word)}"> <word>boolean</word> </c:if> <c:if test="${fn:startsWith('break', word)}"> <word>break</word> </c:if> <c:if test="${fn:startsWith('bird', word)}"> <word>bird</word> </c:if> <c:if test="${fn:startsWith('blur', word)}"> <word>blur</word> </c:if> <c:if test="${fn:startsWith('call', word)}"> <word>call</word> </c:if> <c:if test="${fn:startsWith('class', word)}"> <word>class</word> </c:if> <c:if test="${fn:startsWith('card', word)}"> <word>card</word> </c:if> <c:if test="${fn:startsWith('dacnomania', word)}"> <word>dacnomania</word> </c:if> <c:if test="${fn:startsWith('document', word)}"> <word>document</word> </c:if> </words> ~~~ 就是一個xml格式的文檔,通過使用jstl表達式,用startsWith函數匹配,如果通過就顯得在xml內容中,還有看到上面的contentType="text/xml; charset=UTF-8"了沒有,是text/xml哦!這點要注意,如果不設置有的瀏覽器就不能解析了。
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