本文实例讲述了Ajax实现弹出式无刷新城市选择功能。分享给大家供大家参考。具体如下：
这是一款很棒的全国城市选择效果，添加城市时先添加组：找到id是"selectSub"中select标签下，添加option标签，value属性递增，找到id是"selectSub"，按照原有格式添加div，其id属性递增；然后添加二级副选框选项：复制id是"selectSub"下任意input标签，粘贴在需要添加的位置即可，你想扩展的话，配合动态语言完全可以将城市从数据库中读取出来。
运行效果截图如下：
在线演示地址如下：
http://demo.jb51.net/js/2015/js-ajax-dialog-cha-city-codes/
具体代码如下：
<!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弹出式无刷新城市选择特效</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="请选择" name="button"> <DIV id="result"> <DIV class="tit bgc_eee"> <H2>您已选择的城市汇总</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">请选择城市：</H2> <SPAN class="pointer right" onclick="openBg(0);openSelect(0);">[取消]</SPAN> <SPAN class="pointer right" onclick="makeSure();">[确定]</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>中国名城</OPTION> <OPTION value="1">魅力城市</OPTION> <OPTION value="2">东北三省</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="江苏" name="ck00">江苏 </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="贵州" name="ck01">贵州 </DIV> <DIV id="c02"> <INPUT onclick="addPreItem()" type="checkbox" value="黑龙江" name="ck01">黑龙江 <INPUT onclick="addPreItem()" type="checkbox" value="吉林" name="ck01">吉林 <INPUT onclick="addPreItem()" type="checkbox" value="辽宁" name="ck01">辽宁 </DIV> <DIV id="c03"> <INPUT onclick="addPreItem()" type="checkbox" value="美国" name="ck01">美国 <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>您已选择：</H2> </DIV> <DIV class="cont" id="previewItem"></DIV> </DIV> </DIV> <script type="text/javascript"> var grow = $("selectSub").getElementsByTagName("option").length; //组数 var showGrow = 0;//已打开组 var selectCount = 0; //已选数量 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>
希望本文所述对大家的Ajax程序设计有所帮助。