Use jQuery to change a second select list based on the first select list option

$("#select1").change(function() {
  if ($(this).data('options') === undefined) {
    /*Taking an array of all options-2 and kind of embedding it on the select1*/
    $(this).data('options', $('#select2 option').clone());
  }
  var id = $(this).val();
  var options = $(this).data('options').filter('[value=' + id + ']');
  $('#select2').html(options);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<select name="select1" id="select1">
  <option value="1">Fruit</option>
  <option value="2">Animal</option>
  <option value="3">Bird</option>
  <option value="4">Car</option>
</select>


<select name="select2" id="select2">
  <option value="1">Banana</option>
  <option value="1">Apple</option>
  <option value="1">Orange</option>
  <option value="2">Wolf</option>
  <option value="2">Fox</option>
  <option value="2">Bear</option>
  <option value="3">Eagle</option>
  <option value="3">Hawk</option>
  <option value="4">BWM<option>
</select>

Using jQuery data() to store data

I guess hiding elements doesn't work cross-browser(2012), I have'nt tested it myself.

I wanted to make a version of this that uses $.getJSON() from a separate JSON file.

Demo: here

JavaScript:

$(document).ready(function () {
    "use strict";

    var selectData, $states;

    function updateSelects() {
        var cities = $.map(selectData[this.value], function (city) {
            return $("<option />").text(city);
        });
        $("#city_names").empty().append(cities);
    }

    $.getJSON("updateSelect.json", function (data) {
        var state;
        selectData = data;
        $states = $("#us_states").on("change", updateSelects);
        for (state in selectData) {
            $("<option />").text(state).appendTo($states);
        }
        $states.change();
    });
});

HTML:

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
</head>
<body>
    <select id="us_states"></select>
    <select id="city_names"></select>
    <script type="text/javascript" src="updateSelect.js"></script>
</body>
</html>

JSON:

{
    "NE": [
        "Smallville",
        "Bigville"
    ],
    "CA": [
        "Sunnyvale",
        "Druryburg",
        "Vickslake"
    ],
    "MI": [
        "Lakeside",
        "Fireside",
        "Chatsville"
    ]
}

Use jQuery to change a second select list based on the first select list option

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