How to Populate a Cascading Dropdown with JQuery in IE?

Populating a Cascading Dropdown with JQuery

Problem:

In order to create a more interactive user experience, you want to populate a dropdown with options dynamically based on the selection made in a parent dropdown. You've attempted to do this using JavaScript, but you're facing compatibility issues in IE.

Solution:

To enhance compatibility and simplify the implementation, let's convert your JavaScript code to JQuery. Here's how you can achieve cascading dropdowns using JQuery:

<code class="javascript">jQuery(function($) {
    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)
    });
});</code>

Explanation:

• We define a locations object to store all the possible locations for each country.
• When the country dropdown changes, the change() event handler is triggered.
• We retrieve the selected country and the corresponding locations array from the locations object.
• Using JQuery's $.map() function, we create a string of HTML options representing the locations.
• Finally, we populate the #location dropdown with the generated HTML options.

Demo:

Try out a live demo on Fiddle: https://jsfiddle.net/HvXSz/.

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