使用easy-autocomplete js进行多字段验证

Question

我遇到了问题。我有两个输入字段，通过easy-autocomplete js显示下拉项。它运作良好。我想在字段为空或编辑时禁用提交按钮。我的代码无法正常工作。如何解决？

JSFIDDLE

var aTags = ["ask", "always", "all", "alright", "one", "foo", "blackberry", "tweet", "force9", "westerners", "sport"];
        var bTags = ["aaaaaaa", "bbbbbbbb", "ccccccc", "ddddddddd"];

        var options1 = {
        //data: ["blue", "green", "pink", "red", "yellow"]
            data: aTags.concat(bTags),
            list: {
                onMouseOutEvent: function() {
                    //alert("Click !");
                  $("button").removeAttr("disabled");
                },

        onSelectItemEvent: function() {
          var value = $("#basics").getSelectedItemData();

          $("#index-holder").val(value).trigger("change");          
          $("#basics").val(value).trigger("change");
            $("#basics").on("change paste keyup", function() {
              // $("button").attr("disabled", "disabled");
            });
        },

                match: {
             enabled: true
          },    
            }
        };
        $("#basics").easyAutocomplete(options1);        

    var options2 = {
        //data: ["blue", "green", "pink", "red", "yellow"]
            data: aTags.concat(bTags),
            list: {
                onMouseOutEvent: function() {
                    //alert("Click !");
                  $("button").removeAttr("disabled");
                },

        onSelectItemEvent: function() {
          var value = $("#basics2").getSelectedItemData();

          $("#index-holder").val(value).trigger("change");          
          $("#basics2").val(value).trigger("change");
            $("#basics2").on("change paste keyup", function() {
               $("button").attr("disabled", "disabled");
            });
        },

                match: {
             enabled: true
          },    
            }
        };
    $("#basics2").easyAutocomplete(options2);
    $("button").attr("disabled", "disabled");