日期:2014-05-16 浏览次数:20521 次
方法一:(纯javascript+jsp+servlet)
<script type="text/javascript"> var request = getRequest(); function getRequest(){ var request; if(window.XMLHttpRequest){ request = new XMLHttpRequest(); //alert("xmlRequestHttp"); } else{ request = new ActiveXObject("Microsoft.XMLHTTP"); alert("xobject"); } return request; } function fun_init(){ // alert("init"); var url = '<%=request.getContextPath()%>/CityLinkServlet?level=1'; request.open('POST',url,true); request.onreadystatechange = show_province; request.send(null); } function change_province(_level,_code){ //alert(_level); var url = '<%=request.getContextPath()%>/CityLinkServlet?level='+_level+'&code='+_code; request.open('POST',url,true); request.onreadystatechange = show_city; request.send(null); } function change_city(_level,_code){ //alert(_level); var url = '<%=request.getContextPath()%>/CityLinkServlet?level='+_level+'&code='+_code; request.open('POST',url,true); request.onreadystatechange = show_county; request.send(null); } function show_province(){ if(request.readyState == 4){ if(request.status == 200){ var ret = request.responseText; var jsonObj = eval("("+ret+")"); //alert(jsonObj.data.length); //alert(document.getElementById("province")); var obj = document.getElementById("province"); for(var i=0;i<jsonObj.length;i++){ var item = new Option(jsonObj[i].name,jsonObj[i].code); obj.options.add(item); } } } } function show_city(){ if(request.readyState == 4){ if(request.status == 200){ var ret = request.responseText; var jsonObj = eval("("+ret+")"); var obj = document.getElementById("city"); obj.options.length = 1; for(var i=0;i<jsonObj.length;i++){ var item = new Option(jsonObj[i].name,jsonObj[i].code); obj.options.add(item); } } } } function show_county(){ //alert(request); if(request.readyState == 4){ if(request.status == 200){ var ret = request.responseText; var jsonObj = eval("("+ret+")"); var obj = document.getElementById("county"); obj.options.length = 1; for(var i=0;i<jsonObj.length;i++){ var item = new Option(jsonObj[i].name,jsonObj[i].code); obj.options.add(item); } //alert(jsonObj.data.length); } } } </script> </head> <body onload="fun_init()"> <div> <label>省</label> <select id="province" onchange="change_province(2,this.value)"> <option value="--">---请选择---</option> </select> <br/> <label>市</label> <select id="city" onchange = "change_city(3,this.value)"> <option value="--">---请选择---</option> </select> <br/> <label>县</label> <select id="county"> <option value="--">---请选择---</option> </select> <br/> </div> </body> </html>
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方法二:(jquery+jsp+servlet)
<script type="text/javascript" src="<%=request.getContextPath()%>/jquery/jquery-1.7.1.js"></script> <script type="text/javascript"> $(function(){ var $province = $("#province"); var $city = $("#city"); var $county = $("#county"); //省份选择框变化处理函数 $province.change(function(){ //alert($province.val()); $city[0].options.length = 1; $county[0].options.length = 1; $.ajax({ type:'post', url:'<%=request.getContextPath()%>/CityLinkServlet', dataType:'json', data:{level:'2',code:$province.val()}, success:function(ret){ $.each(ret,function(){ $city.append("<option value="+this.code+">"+this.name+"</option>"); }); }, error:function(){alert("出现未知故障");} });