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Editorial Team
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Asked: 2026-06-03T15:10:18+00:00

I have three drop down menus that query a MYSQL database depending on what

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I have three drop down menus that query a MYSQL database depending on what a user selects. One of the menus is dynamic and but I can’t get it to return data – the other two work fine. I think i need to catch the JS onchange event and then pass it to PHP in order to run the query but I am going in circles at present.

Below is what i am trying to do. All the values are stored in the <head> section – I have added my query and select html and on change event below.

$category=$_POST['Category'];
$subcategory=$_POST['Subcategory'];
$destination=$_POST['Destination'];

$result = mysql_query("SELECT * FROM travel WHERE Category='$category'
AND Subcategory='$subcategory' AND Destination='$destination'")
or die(mysql_error());

$row = mysql_fetch_assoc( $result ) ;


<select name="subcategory" id="subcategory onchange="javascript:
dropdownlist(this.options[this.selectedIndex].value)">
<option value="">Select Sub-Category</option>
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1 Answer

  1. Editorial Team

    Try this jQuery:

    $(document).ready(function() {
    $('#myelement').change(function() {
        $.ajax(
            serverUrl,
            {
                data: { /* Put your input data in here as a hash */ }
                type: 'POST',
                dataType: 'json',
                success: function(data, textStatus, jqXHR) {
                    /* Put your response handler in here */
                }
            }
        );
    });
});

    I’ll leave you to do the server bit – you’ll need json_encode(). Have fun!

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