下拉列表没有填充

Question

我正在尝试从下拉列表中选择值并且相应于该值，列表框应该被填充并且我从我的json获取值。在添加ist框之前，我的下拉列表工作正常，但现在没有任何内容显示在下拉列表中，甚至在列表框中...下面是我的javascript ...请我需要你的帮助......

$(document).ready(function () {

    $.getJSON("data.json",function(obj) {
    var jsObject = $.parseJSON(obj);
        var usedNames = [];
        $.each(obj, function(key, value) {
            if (usedNames.indexOf(value.name) == -1) {
                $("#dropdown1").append("<option value=" + key + ">" + value.name + "</option>");
                usedNames.push(value.name);
            }
    $('<option>', {
        text: 'Select your Option',
        value: '',
        selected: 'selected',
        disabled: 'disabled'
    }).appendTo('#dropdown1');

    $.each(jsObject, function (index, value) {
        $('<option>', {
            text: value['name'],
            value: index
        }).appendTo('#dropdown1');
    });

    $('<option>', {
        text: 'Select your List Option',
        value: '',
        selected: 'selected',
        disabled: 'disabled'
    }).appendTo('#listbox');


    $('#dropdown1').change(function () {
        $('#listbox').empty();

        $('<option>', {
            text: 'Select your List Option',
            value: '',
            selected: 'selected',
            disabled: 'disabled'
        }).appendTo('#listbox');

        var selection = $('#dropdown1 :selected').text();
        $.each(jsObject, function (index, value) {
            if (value['name'] === selection) {
                $('<option>', {
                    text: value['attr001'],
                    value: 'attr001'
                }).appendTo('#listbox');
                $('<option>', {
                    text: value['attr002'],
                    value: 'attr002'
                }).appendTo('#listbox');
                $('<option>', {
                    text: value['attr003'],
                    value: 'attr003'
                }).appendTo('#listbox');
            }
        });
    });

我的json文件

[{
  "name": "obs",
  "date": "1458834026000",
  "attr001": "brs1",
  "attr002": "crs1",
  "attr003": "drs1",
}, {
  "name": "hid",
  "date": "1458774000000",
  "attr001": "ffrs1",
  "attr002": "grrs1",
  "attr003": "mno1",
}, {
  "name": "qwe",
  "date": "1425744000000",
  "attr001": "klm1",
  "attr002": "wer1",
  "attr003": "iop1",
}, {
  "name": "rty",
  "date": "1458774000000",
  "attr001": "yrs1",
  "attr002": "qws1",
  "attr003": "prs1"
}]