jQuery中Chosen三级联动功能实例代码

Chosen 是一个JavaScript插件，它能让丑陋的、很长的select选择框变的更好看、更方便,不仅如此，它更扩大了，增长了主动筛选的功能。

本文介绍Chosen联动，具体代码如下：

var addressResolve = function (options) {
  //检测用户传进来的参数是否合法
  if (!isValid(options))
    return this;
  //默认参数
  var defaluts = {
    proId: 'divProv',
    cityId: 'divCity',
    areaId: 'divArea'
  };
  var opts = $j.extend({}, defaluts, options);//使用jQuery.extend 覆盖插件默认参数
  var addressInfo = this;
  this.provInfo = $j("#" + opts.proId);//省份select对象
  this.cityInfo = $j("#" + opts.cityId);//城市select对象
  this.areaInfo = $j("#" + opts.areaId);//区县select对象
  /*省份初始化方法*/
  this.provInfoInit = function () {
    var proOpts = "";
    $j.each(provinceJson, function (index, item) {
      proOpts += "<option value='" + item.ProID + "'>" + item.name + "</option>";
    });
    addressInfo.provInfo.append(proOpts);
    addressInfo.provInfo.chosen(); //初始化chosen
    addressInfo.cityInfo.chosen();//初始化chosen
    addressInfo.areaInfo.chosen();//初始化chosen
  };
  /*城市选择绑定方法*/
  this.selectCity = function () {
    addressInfo.cityInfo.empty();
    addressInfo.cityInfo.append("<option value=选择城市>选择城市</option>");
    addressInfo.areaInfo.empty();
    addressInfo.areaInfo.append("<option value=选择区县>选择区县</option>");
    if (addressInfo.provInfo.val() == "选择省份") { //选择无效时直接返回
      addressInfo.cityInfo.trigger("liszt:updated");
      addressInfo.areaInfo.trigger("liszt:updated");
      return;
    }
    var provId = addressInfo.provInfo.val();//获取选择的省份值
    var cityOpts = "";
    $j.each(cityJson, function (index, item) {
      if (item.ProID == provId) {
        cityOpts += "<option value='" + item.CityID + "'>" + item.name + "</option>";
      }
    });
    addressInfo.cityInfo.append(cityOpts);
    addressInfo.cityInfo.trigger("liszt:updated");
    addressInfo.areaInfo.trigger("liszt:updated");
  };
  /*区县选择绑定方法*/
  this.selectArea = function () {
    if (addressInfo.cityInfo.val() == "选择城市") return;
    addressInfo.areaInfo.empty();
    addressInfo.areaInfo.append("<option value=选择区县>选择区县</option>");
    var cityId = addressInfo.cityInfo.val();//获取选择的城市值
    var areaOpts = "";
    $j.each(areaJson, function (index, item) {
      if (item.CityID == cityId) {
        areaOpts += "<option value='" + item.Id + "'>" + item.DisName + "</option>";
      }
    });
    addressInfo.areaInfo.append(areaOpts);
    addressInfo.areaInfo.trigger("liszt:updated");
  };
  /*对象初始化方法*/
  this.init = function () {
    addressInfo.provInfo.append("<option value=选择省份>选择省份</option>");
    addressInfo.cityInfo.append("<option value=选择城市>选择城市</option>");
    addressInfo.areaInfo.append("<option value=选择区县>选择区县</option>");
    addressInfo.provInfoInit();
    addressInfo.provInfo.bind("change", addressInfo.selectCity);
    addressInfo.cityInfo.bind("change", addressInfo.selectArea);
  }
  //私有方法，检测参数是否合法
  function isValid(options) {
    return !options || (options && typeof options === "object") ? true : false;
  }
}