Question

i have a form where a user can select timing intervals. But I only want that the could choose only one option. On selecting a value from a dropdown jQuery should reset the other dropdowns.
HTML (and php but not relevant):

<select class="span1" name="repeatminute" id="repeatIntervalTiming" onChange="disableOther(this)">
            <?php for($i=0; $i<61;$i++){ echo "<option>$i</option>"; } ?>
            </select>
            minute(s)</label>
              <label>
            <select class="span1" name="repeathour" id="repeatIntervalTiming" onChange="disableOther(this)">
            <?php for($i=0; $i<25;$i++){ echo "<option>$i</option>"; } ?>
            </select>
             hour(s)</label>
            <label>
            <label>
                 <select class="span1" name="repeatday" id="repeatIntervalTiming" onChange="disableOther(this)">
            <?php for($i=0; $i<32;$i++){ echo "<option>$i</option>"; } ?>
            </select>
            day(s)</label>
            <label>
            <select class="span1" name="repeatmonth" id="repeatIntervalTiming" onChange="disableOther(this)">
            <?php for($i=0; $i<13;$i++){ echo "<option>$i</option>"; } ?>
             </select>
             month(s)</label> 

Here is my jQuery try:

function disableOther(caller){
    $('#repeatIntervalTiming').each(function(index) {
        if ($(this).text() != caller.textContent){
            $(this).val(0);
        }
    });

Answer 1

There is a .not() method in jQuery which removes element(s) from the set of matched elements.

$('select.span1').change(function() {
    $('select.span1').not($(this)).val('');
});

Documentation here.

PS1: Use unique IDs! I have changed your ID selector to class selector.

PS2: Avoid inline javascript if possible. My example is unobtrussive.