<select id="CategoryFirst" class="ld-select-1" name="CategoryFirst"><option value="">请选择大类</option></select>
<select id="CategorySecond" class="ld-select-1" name="CategorySecond"><option value="">请选择小类</option></select>
<script src="../Scripts/jquery-1.6.1.min.js" type="text/javascript"></script>
<script src="../Scripts/jQuery.LiveSelect.js" type="text/javascript"></script>
$(".ld-select-1").ld({ ajaxOptions: { "url": "../Ajax/CategoryHandler.ashx" }, defaultParentId: 1,
style: { "width": 120 }
});
if (context.Request.Params["CategoryParentID"] != null)
{
sql = String.Format("SELECT CategoryId ,CategoryName FROM B_Category
WHERE CategoryParentID='{0}'", context.Request.Params["CategoryParentID"]);
}
数据库 单表 id name parentid
json格式 同 前第一篇
插件：
|
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|
(
function
($) {
$.fn.ld =
function
(options) {
var
opts;
var
DATA_NAME =
"ld"
;
//返回API
if
(
typeof
options ==
'string'
) {
if
(options ==
'api'
) {
return
$(
this
).data(DATA_NAME);
}
}
else
{
var
options = options || {};
//覆盖参数
opts = $.extend(
true
, {}, $.fn.ld.defaults, options);
}
if
($(
this
).size() > 0) {
var
ld =
new
yijs.Ld(opts);
ld.$applyTo = $(
this
);
ld.render();
$(
this
).data(DATA_NAME, ld);
}
return
$(
this
);
}
var
yijs = yijs || {};
yijs.Ld =
function
(options) {
//参数
this
.options = options;
//起作用的对象
this
.$applyTo =
this
.options.applyTo && $(
this
.options.applyTo) ||
null
;
//缓存前缀
this
.cachePrefix =
"data_"
;
//写入到选择框的option的样式名
this
.OPTIONS_CLASS =
"ld-option"
;
//缓存，为一个对象字面量。
this
.cache = {};
}
yijs.Ld.prototype = {
/**
* 运行
* @return {Object} this
*/
render:
function
() {
var
_that =
this
;
var
_opts =
this
.options;
if
(
this
.$applyTo !=
null
&&
this
.size() > 0) {
_opts.style !=
null
&&
this
.css(_opts.style);
//加载默认数据，向第一个选择框填充数据
this
.load(_opts.defaultLoadSelectIndex, _opts.defaultParentId);
_opts.texts.length > 0 &&
this
.selected(_opts.texts);
//给每个选择框绑定change事件
this
.$applyTo.each(
function
(i) {
i < _that.size() - 1 && $(
this
).bind(
"change.ld"
, { target: _that, index: i }, _that.onchange);
})
}
return
this
;
},
texts:
function
(ts) {
var
that =
this
;
var
$select =
this
.$applyTo;
var
_arr = [];
var
txt =
null
;
var
$options;
$select.each(
function
() {
txt = $(
this
).children(
'.'
+ that.OPTIONS_CLASS +
':selected'
).text();
_arr.push(txt);
})
return
_arr;
},
/**
* 获取联动选择框的数量
* @return {Number} 选择框的数量
*/
size:
function
() {
return
this
.$applyTo.size();
},
/**
* 设置选择框的样式
* @param {Object} style 样式
* @return {Object} this
*/
css:
function
(style) {
style &&
this
.$applyTo.css(style);
return
this
;
},
/**
* 读取数据，并写入到选择框
* @param {Number} selectIndex 选择框数组的索引值
* @param {String} parent_id 父级id
*/
load:
function
(selectIndex, parent_id, callback) {
var
_that =
this
;
//清理index以下的选择框的选项
for
(
var
i = selectIndex; i < _that.size(); i++) {
_that.removeOptions(i);
}
//存在缓存数据,直接使用缓存数据生成选择框的子项；不存在，则请求数据
if
(_that.cache[parent_id]) {
_that._create(_that.cache[parent_id], selectIndex);
_that.$applyTo.eq(selectIndex).trigger(
"afterLoad"
);
if
(callback) callback.call(
this
);
}
else
{
var
_ajaxOptions =
this
.options.ajaxOptions;
var
_d = _ajaxOptions.data;
var
_parentIdField =
this
.options.field[
'parent_id'
];
_d[_parentIdField] = parent_id;
//传递给后台的参数
_ajaxOptions.data = _d;
//ajax获取数据成功后的回调函数
_ajaxOptions.success =
function
(data) {
//遍历数据，获取html字符串
if
(data.success) {
//2011-6-1 修改
var
_h = _that._getOptionsHtml(data.data);
//2011-5-31 修改
_that._create(_h, selectIndex);
_that.cache[parent_id] = _h;
_that.$applyTo.eq(selectIndex).trigger(
"afterLoad.ld"
);
if
(callback) callback.call(
this
);
}
}
$.ajax(_ajaxOptions);
}
},
/**
* 删除指定index索引值的选择框下的选择项
* @param {Number} index 选择框的索引值
* @return {Object} this
*/
removeOptions:
function
(index) {
this
.$applyTo.eq(index).children(
"."
+
this
.OPTIONS_CLASS).remove();
return
this
;
},
selected:
function
(t, completeCallBack) {
var
_that =
this
;
if
(t &&
typeof
t ==
"object"
&& t.length > 0) {
var
$select =
this
.$applyTo;
_load(_that.options.defaultLoadSelectIndex, _that.options.defaultParentId);
}
/**
* 递归获取选择框数据
* @param {Number} selectIndex 选择框的索引值
* @param {Number} parent_id id
*/
function
_load(selectIndex, parent_id) {
_that.load(selectIndex, parent_id,
function
() {
var
id = _selected(selectIndex, t[selectIndex]);
selectIndex++;
if
(selectIndex > _that.size() - 1) {
if
(completeCallBack) completeCallBack.call(
this
);
return
;
}
_load(selectIndex, id);
});
}
/**
* 选中包含指定文本的选择项
* @param {Number} index 选择框的索引值
* @param {String} text 文本
* @return {Number} 该选择框的value值
*/
function
_selected(index, text) {
var
id = 0;
_that.$applyTo.eq(index).children().each(
function
() {
var
reg =
new
RegExp(text);
if
(reg.test($(
this
).text())) {
$(
this
).attr(
"selected"
,
true
);
id = $(
this
).val();
return
;
}
})
return
id;
}
return
this
;
},
/**
* 选择框的值改变后触发的事件
* @param {Object} e 事件
*/
onchange:
function
(e) {
//实例化后的对象引用
var
_that = e.data.target;
//选择框的索引值
var
index = e.data.index;
//目标选择框
var
$target = $(e.target);
var
_parentId = $target.val();
var
_i = index + 1;
_that.load(_i, _parentId);
},
/**
* 将数据源（json或xml）转成html
* @param {Object} data
* @return {String} html代码字符串
*/
_getOptionsHtml:
function
(data) {
var
_that =
this
;
var
ajaxOptions =
this
.options.ajaxOptions;
var
dataType = ajaxOptions.dataType;
var
field =
this
.options.field;
var
_h =
""
;
_h = _getOptions(data, dataType, field).join(
""
); ;
/**
* 获取选择框项html代码数组
* @param {Object | Array} data 数据
* @param {String} dataType 数据类型
* @param {Object} field 字段
* @return {Array} aStr
*/
function
_getOptions(data, dataType, field) {
var
optionClass = _that.OPTIONS_CLASS;
var
aStr = [];
var
id, name;
if
(dataType ==
"json"
) {
$.each(data,
function
(i) {
id = data[i][field.region_id];
name = data[i][field.region_name];
var
_option =
"<option value='"
+ id +
"' class='"
+ optionClass +
"'>"
+ name +
"</option>"
;
aStr.push(_option);
})
}
else
if
(dataType ==
"xml"
) {
$(data).children().children().each(
function
() {
id = $(
this
).find(field.region_id).text();
name = $(
this
).find(field.region_name).text();
var
_option =
"<option value='"
+ id +
"' class='"
+ optionClass +
"'>"
+ name +
"</option>"
;
aStr.push(_option);
})
}
return
aStr;
}
return
_h;
},
/**
* 向选择框添加html
* @param {String} _h html代码
* @param {Number} index 选择框的索引值
*/
_create:
function
(_h, index) {
var
_that =
this
;
this
.removeOptions(index);
this
.$applyTo.eq(index).append(_h);
}
}
$.fn.ld.defaults = {
/**选择框对象数组*/
selects:
null
,
/**ajax配置*/
ajaxOptions: {
url:
null
,
type:
'get'
,
data: {},
dataType:
'json'
,
success:
function
() { },
beforeSend:
function
() { }
},
/**默认父级id*/
defaultParentId: 0,
/**默认读取数据的选择框*/
defaultLoadSelectIndex: 0,
/**默认选择框中的选中项*/
texts: [],
/**选择框的样式*/
style:
null
,
/**选择框值改变时的回调函数*/
change:
function
() { },
field: {
region_id:
"CategoryId"
,
region_name:
"CategoryName"
,
parent_id:
"CategoryParentID"
}
}
})(jQuery);
|
本文转自曾祥展博客园博客，原文链接http://www.cnblogs.com/zengxiangzhan/archive/2011/06/04/2072733.html
：，如需转载请自行联系原作者
