jquery 里面下拉列表select html

AJAX 是一种用于创建快速动态网页的技术。

通过在后台与服务器进行少量数据交换，AJAX 可以使网页实现异步更新。这意味着可以在不重新加载整个网页的情况下，对网页的某部分进行更新,用户体验非常好。

下面介绍两种动态加载DropDownList值的方法。

第一种：

View层

$(document).ready(function() {
showFuncId();
}
function showFuncId(){
$('#funcNum').empty();
var ciValue = $('#funcNum');
ciValue.append('Pls Select');
$.ajax({
url : u, //your actual url
type : 'post',
dataType : 'json',
success : function (opts) {
if (opts && opts.length > 0) {
var html = [];
for (var i = 0; i < opts.length; i++) {
html.push(''+opts[i].desc+'');
}
ciValue.append(html.join(''));
}
}
});
}

Controller层

response.setContentType("application/json");
response.setCharacterEncoding("utf-8");
PrintWriter writer = response.getWriter();
net.sf.json.JSONArray array = JSONArray.fromObject(new ArrayList());//The list that contains actual data,use a new arrayList instead here
writer.append(array.toString());
return null;

第二种：

View层

$(function(){
$.ajax({
type: 'POST',
url:url;//your actual url
dataType: 'json',
cache: false,
async:false,
success:function(data) {
$('#funcNum').get(0).options.length = 0;
$('#funcNum').append('Pls Select');
$.each(data, function(i, obj) {
var option = $('');
option.val();
option.text(obj.desc);
$('#funcNum').append(option);
});
},
error: function() {
alert("Error while getting func num results");
}
});
});

Controller层

response.setContentType("application/json");
response.setCharacterEncoding("utf-8");
PrintWriter writer = response.getWriter();
net.sf.json.JSONArray array = JSONArray.fromObject(new ArrayList());//The list that contains actual data,use a new arrayList instead here
writer.append(array.toString());
return null;
Note:
As JSON format supports the following data types .
1
Number
double- precision floating-point format in JavaScript
2
String
double-quoted Unicode with backslash escaping
3
Boolean
true or false
4
Array
an ordered sequence of values
5
Value
it can be a string, a number, true or false, null etc
6
Object
an unordered collection of key:value pairs
7
Whitespace
can be used between any pair of tokens
8
null
empty
for date value, need add config to fromObject, core code:
JsonConfig config = new JsonConfig();
config.registerJsonBeanProcessor(java.sql.Date.class, new JsDateJsonBeanProcessor());
JSONArray array = JSONArray.fromObject(object, config);