日期:2014-05-16  浏览次数:20529 次

省市县三级连动三种实现方式(javascript+jsp+servlet)、(jquery+jsp+servlet)、(extjs4.0+jsp+servle)

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>

?

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");}
			});