How to Populate Cascading Dropdowns with jQuery for Improved Browser Compatibility?

Populating Cascading Dropdowns with jQuery

Background

You've encountered a challenge when attempting to make a form with dynamic cascading dropdowns using both HTML and JavaScript. Your initial JavaScript code worked, but compatibility issues arose in Internet Explorer. Consequently, you're seeking to transition to jQuery for enhanced compatibility.

The Solution

The solution to your problem is surprisingly simple:

<br>jQuery(function($) {</p>
<pre class="brush:php;toolbar:false">var locations = {
    'Germany': ['Duesseldorf', 'Leinfelden-Echterdingen', 'Eschborn'],
    'Spain': ['Barcelona'],
    'Hungary': ['Pecs'],
    'USA': ['Downers Grove'],
    'Mexico': ['Puebla'],
    'South Africa': ['Midrand'],
    'China': ['Beijing'],
    'Russia': ['St. Petersburg'],
}

var $locations = $('#location');
$('#country').change(function () {
    var country = $(this).val(), lcns = locations[country] || [];

    var html = $.map(lcns, function(lcn){
        return '<option value="' + lcn + '">' + lcn + '</option>'
    }).join('');
    $locations.html(html)
});

});

Demo

Check out a live demonstration of this solution on [Fiddle](fiddle link here).

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