Question

is it possible to change the limit the value of the dropdown2 when the dropdown1 changes?
here is my code

<!--DROPDOWN 1-->
<p class="">From</p>
<select name="From" id="From" onChange="displayVal(this)">
<option value="any">Any</option>
<option value="none">None</option>
<option value="10000">&pound;10,000</option>
<option value="20000">&pound;20,000</option>
<option value="30000">&pound;30,000</option>
<option value="40000">&pound;40,000</option>
<option value="50000">&pound;50,000</option>
<option value="60000">&pound;60,000</option>
<option value="70000">&pound;70,000</option>
<option value="80000">&pound;80,000</option>
<option value="90000">&pound;90,000</option>
<option value="100000">&pound;100,000</option>
<option value="110000">&pound;110,000</option>
<option value="120000">&pound;120,000</option>
<option value="130000">&pound;130,000</option>
<option value="140000">&pound;140,000</option>
<option value="150000">&pound;150,000</option>
<option value="150001">&pound;150,000+</option>
</select>

<!--DROPDOWN 2-->
<p class="">To</p>
<select name="To" id="To">
<option value="any">Any</option>
<option value="none">None</option>
<option value="10000">&pound;10,000</option>
<option value="20000">&pound;20,000</option>
<option value="30000">&pound;30,000</option>
<option value="40000">&pound;40,000</option>
<option value="50000">&pound;50,000</option>
<option value="60000">&pound;60,000</option>
<option value="70000">&pound;70,000</option>
<option value="80000">&pound;80,000</option>
<option value="90000">&pound;90,000</option>
<option value="100000">&pound;100,000</option>
<option value="110000">&pound;110,000</option>
<option value="120000">&pound;120,000</option>
<option value="130000">&pound;130,000</option>
<option value="140000">&pound;140,000</option>
<option value="150000">&pound;150,000</option>
<option value="150001">&pound;150,000+</option>
</select>

I want is when I change dropdown1 to none the dropdown2 option will only show none and no other more.
And I also want is if I change the value of dropdown1 to an amount, for example 30000, dropdown2 will show only the values that are greater that 30000 including the option any.
Is there a way to do this in javascript or jQuery?
sorry. I’m new at javascript and jQuery.. Thank you in advance!

Answer 1

Demo: http://jsfiddle.net/LsaLA/1/

Code:

function setTo() {
    var f = $('#From').val();
    var t = $('#To');
    t.children().hide();
    if( f == 'none' ) {
        t.children('[value="none"]').show();
        t.val('none');
    }
    else if( t == 'any' ) {
        t.children().show();
        t.val('any');
    }
    else {
        f = parseInt(f, 10);
        t.children().each(function() {
            if( $(this).val() == 'any' ) {
                $(this).show();
                t.val('any');
            }
            else {
                var v = parseInt($(this).val(), 10);
                if(!isNaN(v) && v >= f) {
                    $(this).show();
                }
            }
        });
        t.val('any');
    }
}

$('#From').change(setTo);


//call it on load as well
setTo();