How do I enable/disable options in Select Box using jquery

Question

I have a select box which contains the options and optgroup that are generated dynamically using php.Now when I select \"ALL\" all the other optgroup

Answer 1

This is kind of a strange thing to be doing but here's code that meets your requirements.

$('select').on('change', function() {
    if (this.value == '-1') {
        $('optgroup option').prop('disabled', true);
    } else {
        $('optgroup option').prop('disabled', false);
    }
});

Live Example - http://jsfiddle.net/NpNFh/