JSON的链州城市下拉列表 [英] Chained State city dropdown list from JSON

问题描述

我正在尝试填充链接的State City select下拉列表.我正在使用一个外部json文件来执行此操作，该文件由State及其对应的城市名称，ID和Pincode组成.有人可以给我一些关于如何实现这一点的想法.我需要根据州选择来填充城市和密码.预先感谢...

I am trying to populate a chained State City select dropdowns. I am using an external json file to do so, which consists of State and their corresponding city name, id and pincode. Can somebody gimme some idea on how to achieve this. I need to populate the city and pincode value based on the state selection. Thanks in advance...

{
"Alaska" : [
            {"id": "1", "name": "Adak", "pincode": "xxx1"},
            {"id": "2", "name": "Akhiok", "pincode": "xxx2" },
            {"id": "3", "name": "Akiak", "pincode": "xxx3" },           
       ],

"Arizona" : [
            {"id": "4", "name": "Apache Junction", "pincode": "xxx4"},
            {"id": "5", "name": "Avondale", "pincode": "xxx5"},
            {"id": "6", "name": "Benson", "pincode": "xxx6"},
        ],

"Alabama" : [
            {"id" : "5", "name": "Abbeville", "pincode": "xxx7" },
            {"id" : "7", "name": "Adamsville", "pincode": "xxx8" },
            {"id" : "8", "name": "Akron", "pincode": "xxx9" },
        ]
}

最终呈现的html

<select id="state">
      <option value="1">Alaska</option>
      <option value="2">Arizona</option>
      <option value="3">Alabama</option>
      </select>

      <select id="city">
      <option value="4">Adak</option>
      <option value="5">Akhiok</option>
      <option value="6">Akiak</option>
      </select>

      <input id="pincode" type="text" />

推荐答案

我发现您的问题很有趣，并编写了相应的解决方案，您可以实时查看

I find your question interesting and wrote the corresponding solution which you can see live here.

这是代码:

jQuery(document).ready(function () {
    var myData;
    var onCityChange = function (e) {
        var cityData = $("option:selected", e.target).data('pincode');
        $("#pincode").val(cityData.pincode);
    };
    var onStateChange = function (e) {
        var state = $("option:selected", e.target).text();
        if (state && myData) {
            var stateData = myData[state];
            if (stateData && stateData.length > 0) {
                $("#city").empty();
                $("#city").unbind('change');
                for (var i = 0; i < stateData.length; i++) {
                    var cityData = stateData[i];
                    var option = $('<option value="' + cityData.id + '">' + cityData.name + '</option>')
                                    .data('pincode', cityData);
                    $("#city").append(option);
                }
                $("#city").bind('change', onCityChange)
                            .trigger('change');
            }
        }
    };
    $.ajax({
        url: 'DependendSelectsFromJson.json',
        dataType: 'json',
        success: function (data) {
            var stateOptions = "", stateId = 1;
            for (var prop in data) {
                if (data.hasOwnProperty(prop)) {
                    stateOptions += '<option value="' + stateId + '">' + prop + '</option>';
                    stateId++;
                }
            }
            myData = data;
            $("#state").html(stateOptions)
                .bind('change', onStateChange)
                .trigger('change');
        }
    });
});

获得关于第二个(城市)选择框的pincode的访问权限，我使用了 jQuery.data 函数，如果有人需要将一些其他信息与DOM元素相关联，我会发现它非常实用.只能以这种方式保存pincode值，但是我使用了该功能来保存有关城市的完整信息.

to get access about the pincode of the second (city) select box I used jQuery.data function which I find very practical if one need to associate some additional information with an DOM element. One could save only pincode value in the way, but I used the function to save full information about the city.

更新:我忘了提到您发布的JSON数据有错误.您应在']'之前删除逗号.可能只是将数据剪切并粘贴到问题的文本中而已.

UPDATED: I forgot to mention that the JSON data which you posted has errors. You should remove commas before ']'. Probably it is just a problem with cut&paste of the data to the text of the question.

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