(function( $ ) {
    $.widget( "custom.combobox", {
      _create: function() {
        this.wrapper = $( "<div style='display:inline-block;'>" )
          .addClass( "custom-combobox" )
          .insertAfter( this.element );
 
        this.element.hide();
        this._createAutocomplete();
        this._createShowAllButton();
      },
 
      _createAutocomplete: function () {
        var selected = this.element.children( ":selected" ),
          value = selected.val() ? selected.text() : "";
 
        this.input = $("<input placeholder='" + this.element.attr('placeholder') + "'>")
          .appendTo( this.wrapper )
          .val( value )
          .attr( "title", "" )
          .addClass("form-control")
          .autocomplete({
            delay: 0,
            minLength: 0,
            source: $.proxy( this, "_source" )
          })
          .tooltip({
            tooltipClass: "ui-state-highlight"
          });
 
        this._on(this.input, {
            //选择回调
            autocompleteselect: function (event, ui) {

            ui.item.option.selected = true;
            this._trigger( "select", event, {
              item: ui.item.option
            });
                //判断是否有中心编码
            if ($(ui.item.option).attr('centrcode')) {
                $('#centrcode').text($(ui.item.option).attr('centrcode'));
            }
            
          },
 
          autocompletechange: "_removeIfInvalid"
        });
      },
 
      _createShowAllButton: function() {
        var input = this.input,
          wasOpen = false;
 
        $( "<a style='display:none;'>" )
          .attr( "tabIndex", -1 )
          .attr( "title", "Show All Items" )
          .tooltip()
          .appendTo( this.wrapper )
          .button({
            icons: {
              primary: "ui-icon-triangle-1-s"
            },
            text: false
          })
          .removeClass( "ui-corner-all" )
          .addClass( "custom-combobox-toggle ui-corner-right" )
          .mousedown(function() {
            wasOpen = input.autocomplete( "widget" ).is( ":visible" );
          })
          .click(function() {
            input.focus();
 
            // 如果已经可见则关闭
            if ( wasOpen ) {
              return;
            }
 
            // 传递空字符串作为搜索的值，显示所有的结果
            input.autocomplete( "search", "" );
          });
      },
 
      _source: function( request, response ) {
        var matcher = new RegExp( $.ui.autocomplete.escapeRegex(request.term), "i" );
        response( this.element.children( "option" ).map(function() {
          var text = $( this ).text();
          if ( this.value && ( !request.term || matcher.test(text) ) )
            return {
              label: text,
              value: text,
              option: this
            };
        }) );
      },
 
      _removeIfInvalid: function( event, ui ) {
 
        // 选择一项，不执行其他动作
          if (ui.item) {
      
          return;
        }
 
        // 搜索一个匹配（不区分大小写）
        var value = this.input.val(),
          valueLowerCase = value.toLowerCase(),
          valid = false;
        this.element.children( "option" ).each(function() {
          if ( $( this ).text().toLowerCase() === valueLowerCase ) {
            this.selected = valid = true;
            return false;
          }
        });
 
        // 找到一个匹配，不执行其他动作
        if ( valid ) {
          return;
        }
 
        // 移除无效的值
        this.input
          .val( "" )
          .tooltip( "open" );
        this.element.val("");
       //清空中心代码
        if ($('#centrcode')) {
            $('#centrcode').text("");
        }
        
        this._delay(function() {
          this.input.tooltip( "close" ).attr( "title", "" );
        }, 2500 );
        this.input.data( "ui-autocomplete" ).term = "";
      },
 
      _destroy: function() {
        this.wrapper.remove();
        this.element.show();
    
      }
    });
  })( jQuery );