How to Create Cascading Dropdowns Without a Database?

Selecting Cascading Dropdowns Without Database

Problem:

In a form, you need two dropdowns, where the options of the second dropdown depend on the selection in the first dropdown, all without using a database.

Solution:

Despite the database method, here's how to achieve this without using one:

HTML Markup:

<code class="html"><select id="primary-dropdown">
    <option value="0">None</option>
    <option value="1">First</option>
    <option value="2">Second</option>
    <option value="3">Third</option>
    <option value="4">Fourth</option>
</select>

<select id="secondary-dropdown">
    <option value="0" selected>None</option>
</select></code>

JavaScript/jQuery:

<code class="javascript">$(document).ready(function() {
    var options = {
        1: ["Smartphone", "Charger"],
        2: ["Basketball", "Volleyball"],
        3: ["Apple", "Orange"],
        4: ["Dog", "Cat"]
    };

    $("#primary-dropdown").on("change", function() {
        var selected = $(this).val();
        $("#secondary-dropdown").empty();
        $.each(options[selected], function(i, option) {
            $("#secondary-dropdown").append("<option value='" + (i + 1) + "'>" + option + "</option>");
        });
    });
});</code>

Explanation:

• We define an object called options to hold the associations between the primary dropdown values and their corresponding secondary dropdown options.
• When the primary dropdown value changes, we empty the secondary dropdown and loop through the options object.
• For the selected primary dropdown value, we append the corresponding options to the secondary dropdown.

This solution allows you to create cascading dropdowns without relying on a database.

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