Question

I need to populate a dropdown list when I select a certain value
and the options need to be queried from the database.

Can I achieve this from jQuery ?
If I can then please I would appreciate any help..

Answer 1

You can do it with jQuery and AJAX

jQuery.post('dropdownValues.php', {parameterSentToServer1:'value', param2:'value2'}, function(data){jQuery('#mydropdown option').remove(); //Remove current options
for (var option in data.results){
    jQuery('#mydropdown').append('<option value="'+option.value+'">'+option.name+'</option>');
}}, 'json');

in dropdownValues.php you’ll need to build a json object with the result of the sql query, the object must be in this format(for working well with the above script):

echo '{results:[{value:1, name:'Option1'}, {value:2, name:'Option2'}]};