本文實例講述了Ajax實現彈出式無刷新城市選擇功能。。具體如下：
這是一款很棒的全國城市選擇效果，添加城市時先添加組：找到id是"selectSub"中select標簽下，添加option標簽，value屬性遞增，找到id是"selectSub"，按照原有格式添加div，其id屬性遞增；然后添加二級副選框選項：復制id是"selectSub"下任意input標簽，粘貼在需要添加的位置即可，你想擴展的話，配合動態語言完全可以將城市從數據庫中讀取出來。
運行效果截圖如下：
在線演示地址如下：
http://demo.Vevb.com/js/2015/js-ajax-dialog-cha-city-codes/
具體代碼如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>Ajax彈出式無刷新城市選擇特效</title><meta http-equiv="content-type" content="text/html;charset=gb2312"><style type="text/css">BODY { FONT-SIZE: 12px; PADDING-TOP: 50px}H2 { PADDING-RIGHT: 0px; PADDING-LEFT: 0px; FONT-WEIGHT: bold; FONT-SIZE: 12px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px}.bton { BORDER-RIGHT: #ccc 1px solid; BORDER-TOP: #ccc 1px solid; BACKGROUND: #ddd; BORDER-LEFT: #ccc 1px solid; BORDER-BOTTOM: #ccc 1px solid}.cont { PADDING-RIGHT: 10px; PADDING-LEFT: 10px; PADDING-BOTTOM: 10px; PADDING-TOP: 10px}#main { MARGIN: 0px auto; WIDTH: 400px}#selectItem { BORDER-RIGHT: #000 1px solid; BORDER-TOP: #000 1px solid; MARGIN-TOP: 10px; Z-INDEX: 2; BACKGROUND: #fff; OVERFLOW: hidden; BORDER-LEFT: #000 1px solid; WIDTH: 400px; BORDER-BOTTOM: #000 1px solid; POSITION: absolute; TOP: 0px}#preview { BORDER-RIGHT: #ccc 1px solid; BORDER-TOP: #ccc 1px solid; MARGIN: 1px; BORDER-LEFT: #ccc 1px solid; BORDER-BOTTOM: #ccc 1px solid}#result { BORDER-RIGHT: #ccc 1px solid; BORDER-TOP: #ccc 1px solid; MARGIN-TOP: 10px; BORDER-LEFT: #ccc 1px solid; BORDER-BOTTOM: #ccc 1px solid}.tit { PADDING-LEFT: 10px; MARGIN: 1px; LINE-HEIGHT: 20px; HEIGHT: 20px}.bgc_ccc { BACKGROUND: #ccc}.bgc_eee { BACKGROUND: #eee}.c_999 { COLOR: #999}.pointer { CURSOR: pointer}.left { FLOAT: left}.right { FLOAT: right}.cls { CLEAR: both; FONT-SIZE: 0px; OVERFLOW: hidden; HEIGHT: 0px}#bg { DISPLAY: none; Z-INDEX: 1; BACKGROUND: #ccc; FILTER: alpha(opacity=70); LEFT: 0px; WIDTH: 100%; POSITION: absolute; TOP: 0px; opacity: 0.7}.hidden { DISPLAY: none}.move { CURSOR: move}</style></head><body><DIV id="main"> <INPUT class="bton pointer" onclick="openBg(1);openSelect(1)" type="button" value="請選擇" name="button"> <DIV id="result"> <DIV class="tit bgc_eee"> <H2>您已選擇的城市匯總</H2> </DIV> <DIV class="cont" id="makeSureItem"></DIV> </DIV></DIV><DIV id="bg"></DIV><DIV class="hidden" id="selectItem"> <DIV class="tit bgc_ccc move" onmousedown="drag(event,this)"> <H2 class="left">請選擇城市：</H2> <SPAN class="pointer right" onclick="openBg(0);openSelect(0);">[取消]</SPAN> <SPAN class="pointer right" onclick="makeSure();">[確定]</SPAN> </DIV> <DIV class="cls"></DIV> <DIV class="cont"> <DIV id="selectSub"> <SELECT style="MARGIN-BOTTOM: 10px" onchange="showSelect(this.value)" name=""> <OPTION value="0" selected>中國名城</OPTION> <OPTION value="1">魅力城市</OPTION> <OPTION value="2">東北三省</OPTION> <OPTION value="3">世界城市</OPTION> </SELECT> <DIV id="c00"> <INPUT onclick="addPreItem()" type="checkbox" value="北京" name="ck00">北京 <INPUT onclick="addPreItem()" type="checkbox" value="福建" name="ck00">福建 <INPUT onclick="addPreItem()" type="checkbox" value="四川" name="ck00">四川 <INPUT onclick="addPreItem()" type="checkbox" value="江蘇" name="ck00">江蘇 </DIV> <DIV id="c01"> <INPUT onclick="addPreItem()" type="checkbox" value="上海" name="ck01">上海 <INPUT onclick="addPreItem()" type="checkbox" value="云南" name="ck01">云南 <INPUT onclick="addPreItem()" type="checkbox" value="貴州" name="ck01">貴州 </DIV> <DIV id="c02"> <INPUT onclick="addPreItem()" type="checkbox" value="黑龍江" name="ck01">黑龍江 <INPUT onclick="addPreItem()" type="checkbox" value="吉林" name="ck01">吉林 <INPUT onclick="addPreItem()" type="checkbox" value="遼寧" name="ck01">遼寧 </DIV> <DIV id="c03"> <INPUT onclick="addPreItem()" type="checkbox" value="美國" name="ck01">美國 <INPUT onclick="addPreItem()" type="checkbox" value="阿富汗" name="ck01">阿富汗 <INPUT onclick="addPreItem()" type="checkbox" value="日本" name="ck01">日本 </DIV> </DIV> </DIV> <DIV id="preview"> <DIV class="tit bgc_eee c_999"> <H2>您已選擇：</H2> </DIV> <DIV class="cont" id="previewItem"></DIV> </DIV></DIV><script type="text/javascript">var grow = $("selectSub").getElementsByTagName("option").length; //組數var showGrow = 0;//已打開組var selectCount = 0; //已選數量 showSelect(showGrow);var items = $("selectSub").getElementsByTagName("input");function $(o){ if(typeof(o) == "string") return document.getElementById(o); return o;}function openBg(state){ if(state == 1) { $("bg").style.display = "block"; var h = document.body.offsetHeight > document.documentElement.offsetHeight ? document.body.offsetHeight : document.documentElement.offsetHeight; $("bg").style.height = h + "px"; } else { $("bg").style.display = "none"; } }function openSelect(state){ if(state == 1) { $("selectItem").style.display = "block"; $("selectItem").style.left = ($("bg").offsetWidth - $("selectItem").offsetWidth)/2 + "px"; $("selectItem").style.top = document.body.scrollTop + 100 + "px"; } else { $("selectItem").style.display = "none"; }}function showSelect(id){ for(var i = 0 ; i < grow ;i++) { $("c0" + i).style.display = "none"; } $("c0" + id).style.display = "block"; showGrow = id;}function open(id,state){ if(state == 1) $(id).style.display = "block"; $(id).style.diaplay = "none";}function addPreItem(){ $("previewItem").innerHTML = ""; var len = 0 ; for(var i = 0 ; i < items.length ; i++) { if(items[i].checked == true) { var mes = "<input type='checkbox' checked='true' value='"+ items[i].value +"' onclick='copyItem(/"previewItem/",/"previewItem/");same(this);'>" + items[i].value; $("previewItem").innerHTML += mes; } }}function makeSure(){ openBg(0); openSelect(0); copyItem("previewItem","makeSureItem") }function copyHTML(id1,id2){ $(id2).innerHTML = $("id1").innerHTML;}function copyItem(id1,id2){ var mes = ""; var items2 = $(id1).getElementsByTagName("input"); for(var i = 0 ; i < items2.length ; i++) { if(items2[i].checked == true) { mes += "<input type='checkbox' checked='true' value='"+ items2[i].value +"' onclick='copyItem(/"" + id2+ "/",/""+ id1 +"/");same(this);'>" + items2[i].value; } } $(id2).innerHTML = ""; $(id2).innerHTML += mes;}function same(ck){ for(var i = 0 ; i < items.length ; i++) { if(ck.value == items[i].value) { items[i].checked = ck.checked; } }} var oDrag = "";var ox,oy,nx,ny,dy,dx;function drag(e,o){ var e = e ? e : event; var mouseD = document.all ? 1 : 0; if(e.button == mouseD) { oDrag = o.parentNode; ox = e.clientX; oy = e.clientY; }}function dragPro(e){ if(oDrag != "") { var e = e ? e : event; dx = parseInt($(oDrag).style.left); dy = parseInt($(oDrag).style.top); nx = e.clientX; ny = e.clientY; $(oDrag).style.left = (dx + ( nx - ox )) + "px"; $(oDrag).style.top = (dy + ( ny - oy )) + "px"; ox = nx; oy = ny; }}document.onmouseup = function(){oDrag = "";}document.onmousemove = function(event){dragPro(event);}</script></body></html>
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