/*
 * @Descripttion: 实现自动懒加载
 * @version: 
 * @Author: 张洋（温州易尚信息技术有限公司）
 * @Date: 2019-11-05 16:43:34
 * @LastEditors: 张洋（温州易尚信息技术有限公司）
 * @LastEditTime: 2019-11-13 15:25:15
 */

(function ($) {
  $.fn.loadmoreManual = function (options) {
    var defaults = {
      loading: '#getmore .loading-box',
      btn: '#getmore .handle',
      url: '',
      page: 1,
      pagecount: 1
    }
    var opts = $.extend(defaults, options);
    var ele = $(this);

    // back yes no
    if ($('#backbuttonstate').val() == "0") {
      $('#backbuttonstate').val('1');
      sessionStorage.setItem('page', '');
      sessionStorage.setItem('top', '');
      sessionStorage.setItem('html', '');
    }
    // sessionStorage
    var page_ss = sessionStorage.getItem('page');
    var page_top = sessionStorage.getItem('top');
    var page_html = sessionStorage.getItem('html');
    var page_def = page_ss ? page_ss : 1;
    $(document).on('click', '.allpro .prolist a', function () {
      sessionStorage.setItem('page', page_ss);
      sessionStorage.setItem('top', $(window).scrollTop());
      sessionStorage.setItem('html', ele.html());
    });
    //backState
    if (page_ss) {
      $('html, body').animate({ scrollTop: page_top }, 0);
      ele.html(page_html);
      sessionStorage.setItem('page', '');
      sessionStorage.setItem('top', '');
      sessionStorage.setItem('html', '');
    }
    opts.page = page_def;
    var pagecount = opts.pagecount;

    if (opts.page<pagecount) $(opts.btn).css('display', 'inline-block');

    $(opts.btn).on('click', function () {
      opts.page++;
      if (opts.page > opts.pagecount) {
        console.log('所有信息已加载完毕');
        return false;
      }
      var pushUrl = opts.url.indexOf('?') > 0 ? (opts.url + '&page=' + opts.page) : (opts.url + '?page=' + opts.page);
      $(opts.btn).css('display', 'none');
      $(opts.loading).css('display', 'block');

      // Ajax
      $.post(pushUrl, function (data) {
        setTimeout(function () {
          ele.append(data);
          $(opts.loading).css('display', 'none');
          if (opts.page < opts.pagecount) $(opts.btn).css('display', 'inline-block');
          page_ss = opts.page;
        }, 360);
      }).fail(function (data) {
        console.log(data);
        alert('拉取信息出错');
      });


    });

  }
})(jQuery);