/*
 * 下拉列表缓存
 * 江鸿宾(QQ33080907)
 * 最近修改：2020.12.03
 * 本插件只用于作者参与的项目，未经许可请勿转载
 */

(function ($) {
  $.fn.selectcache = function (options) {
    var defaults = {
      server: '',
      index: false,
      tree: false,
      cache: true,
      chosen: true,
      notop: false,
      delay: 0
    }
    var opts = $.extend(defaults, options)
    var $this = $(this)

    if ($this.length === 0) { return }
    else if ($this.length > 1) { alert('jquery.selectcache.js: the DOM\'s length > 1') }
    else if ($this.prop('tagName').toLowerCase() !== 'select') { alert('jquery.selectcache.js: only bind to select') }
    else if (!opts.url) { alert('jquery.selectcache.js: missing options (url)') }
    else {
      var deferreds = []
      setTimeout(function () {
        if (typeof store === 'undefined') { deferreds.push($.ajax('/Scripts/store2.min.js', { dataType: 'script', cache: true })) }
        if (opts.tree && typeof ($.fn.jTreeSelect) !== 'function') { deferreds.push($.ajax('/Scripts/jquery.jtree.js', { dataType: 'script', cache: true })) }
        if (opts.server === '' && typeof Global === 'undefined') { deferreds.push($.ajax('/Scripts/global.js', { dataType: 'script', cache: true })) }
        $.when.apply(null, deferreds).done(function () {
          var key = 'selectcache-' + opts.url.substring(1).replace(/\/|\?|=|&/g, '-')
          var list = store(key)
          if (opts.cache && list && list.length) { makeselect(list) }
          else {
            $.getJSON((opts.server || Global.Host) + opts.url, function (json) {
              if (json.code !== 0) { alert(json.message) }
              else {
                list = json.data
                makeselect(list)
                store(key, list)
              }
            })
          }
        })
      }, opts.delay * 1000)
    }

    return this

    // 生成下拉列表
    function makeselect(list) {
      var value = $this.data('value')
      var html = ''
      if (opts.tree) {
        $.each(list, function (i, item) { html += '<option value="' + item.id + '"' + (item.id === value ? ' selected' : '') + ' data-pid="' + item.parid + '">' + item.name + '</option>' })
        $this.append(html).jTreeSelect()
        if (opts.notop) { $this.children().first().remove() }
      }
      else {
        $.each(list, function (i, item) { html += '<option value="' + item.id + '"' + (item.id === value ? ' selected' : '') + '>' + (opts.index ? (i + 1) + '. ' : '') + item.name + '</option>' })
        $this.append(html)
      }
      if (opts.chosen && typeof ($.fn.chosen) === 'function') {
        $this.width(function (i, w) { return w + 12 }).chosen({
          disable_search_threshold: 10,
          no_results_text: '没有结果匹配：',
          search_contains: true,
          placeholder_text_multiple: '按住[Ctrl]可以一次性多选，或多次选择'
        })
      }
    }
  }
})(jQuery)