只要使用搜索引擎的朋友應該都有這樣的體會，就是當在搜索框輸入關鍵字的時候，會出現自能匹配現象，這絕對是非常好的用戶體驗，下面就是一段類似的代碼，當然這里只是掩飾，所以只能匹配的數據都是本地固定好的，在實際應用中可以才能夠數據庫讀取數據。
效果圖：
代碼實例如下:
<!DOCTYPE html><html><head><meta charset=" utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>搜索框關鍵字智能匹配實例代碼</title><style>body, ul, li { margin:0; padding:0;}body { font-size:12px; font-family:sumsun, arial; background:#FFFFFF;}.gover_search { position:relative; z-index:99; height:63px; padding:15px 0 0 20px; border:1px solid #b8cfe6; border-bottom:0; background:url(../images/gover_search_bg.gif) repeat-x 0 0;}.gover_search_form {height:36px;}.gover_search .search_t { float:left; width:112px; line-height:26px; color:#666;}.gover_search .input_search_key { float:left; width:462px; height:18px; padding:3px; margin-right:5px; border:1px solid #ccc; line-height:18px; background:#fff;}.gover_search .search_btn { float:left; width:68px; height:26px; overflow:hidden; border:1px solid #ccc; text-align:center; color:#ff3300; letter-spacing:5px; background:url(../images/gover_search_bg.gif) no-repeat 0 -79px; cursor:pointer; font-weight:bold;}.gover_search .search_suggest { position:absolute; z-index:999; left:132px; top:41px; width:468px; border:1px solid #ccc; border-top:none; display:none; color:#004080;}.gover_search .search_suggest li { height:24px; overflow:hidden; padding-left:3px; line-height:24px; background:#fff; cursor:default;}.gover_search .search_suggest li.hover {background:#ddd;}.num_right { float:right; text-align:right; line-height:24px; padding-right:10px}</style></head><body><div class="gover_search"> <div class="gover_search_form clearfix"> <span class="search_t">關鍵詞匹配搜索</span> <input type="text" class="input_search_key" id="gover_search_key" placeholder="請輸入關鍵詞直接搜索" /> <button type="submit" class="search_btn">搜索</button> <div class="search_suggest" id="gov_search_suggest"> <ul> </ul> </div> </div></div><script type="text/javascript" src="http://www.softwhy.com/mytest/jQuery/jquery-1.8.3.js"></script><script type="text/javascript"> function oSearchSuggest(searchFuc){ var input = $('#gover_search_key'); 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(); } //發送請求，根據關鍵字到后臺查詢 var sendKeyWord = function(event){ //鍵盤選擇下拉項 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()); } } //輸入字符 } else { var valText = $.trim(input.val()); if(valText ==''||valText==key) { return; } searchFuc(valText); key = valText; } } //請求返回后，執行數據展示 this.dataDisplay = function(data){ if(data.length<=0) { suggestWrap.hide(); return; } //往搜索框下拉建議顯示欄中添加條目并顯示 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(); //為下拉選項綁定鼠標事件 suggestWrap.find('li').hover(function(){ suggestWrap.find('li').removeClass('hover'); $(this).addClass('hover'); },function(){ $(this).removeClass('hover'); }).bind('click',function(){ $(this).find("span").remove(); input.val(this.innerHTML); suggestWrap.hide(); }); } init(); }; //實例化輸入提示的JS,參數為進行查詢操作時要調用的函數名 var searchSuggest = new oSearchSuggest(sendKeyWordToBack); //這是一個模似函數，實現向后臺發送ajax查詢請求，并返回一個查詢結果數據，傳遞給前臺的JS,再由前臺JS來展示數據。本函數由程序員進行修改實現查詢的請求 //參數為一個字符串，是搜索輸入框中當前的內容 function sendKeyWordToBack(keyword){ var aData = []; aData.push('<span class="num_right">約100個</span>'+keyword+'返回數據1'); aData.push('<span class="num_right">約200個</span>'+keyword+'返回數據2'); aData.push('<span class="num_right">約100個</span>'+keyword+'返回數據3'); aData.push('<span class="num_right">約50000個</span>'+keyword+'返回數據4'); aData.push('<span class="num_right">約1044個</span>'+keyword+'2012是真的'); aData.push('<span class="num_right">約100個</span>'+keyword+'2012是假的'); aData.push('<span class="num_right">約100個</span>'+keyword+'2012是真的'); aData.push('<span class="num_right">約100個</span>'+keyword+'2012是假的'); //將返回的數據傳遞給實現搜索輸入框的輸入提示js類 searchSuggest.dataDisplay(aData); } </script></body></html>更多關于搜索功能的文章請查看專題《JavaScript搜索功能匯總》
希望本文所述對大家學習javascript程序設計有所幫助。
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