Enabling a dropdown if other forms filled in
<p><code>enter code here</code>i have a form with many fields. What i need is for the drop-down menu at the bottom with name of "Shipping Preference" to be disableD on default until 2 or more of the items form fields are filled in.So 2 text fields are filled in and the dropdow will be enabled. How to do? I don't have the slightest idea. Any help would be greatly appreciated. NOTE ALSO: I HAVE LIMITS ON THE FIELDS AND PLACEHOLDER. Here is the code:</p>

<pre><code> &lt;SCRIPT&gt; $("#Glass_ASTRO_165WNT").on('change', function() {
       this.value = (!Number(this.value)) ? '' : Math.max(100, Math.min(999999, Number(this.value)));
        });

    //With reference to http://www.hagenburger.net/BLOG/HTML5-Input-Placeholder-Fix-With-jQuery.html
    // 1. Handle placeholders (in non-HTML5 compliant browsers).
    if(!supports_input_placeholder()) {
        $('[placeholder]').focus(function () {
            var input = $(this);
            if (input.val() == input.attr('placeholder')) {
                input.val('');
                input.removeClass('placeholder');
            }
        }).blur(function () {
            var input = $(this);
            if (input.val() == '' || input.val() == input.attr('placeholder')) {
                input.addClass('placeholder');
                input.val(input.attr('placeholder'));
            }
        }).blur();

        //2. Prevent placeholder values being submitted to form's action script
        $('[placeholder]').eq(0).closest('form').submit(function () {
            $(this).find('[placeholder]').each(function () {
                var input = $(this);
                if (input.val() == input.attr('placeholder')) {
                    input.val('');
                }


               });
            });
        }
    });&lt;/SCRIPT&gt;

    &lt;form name="amada" method="post" action="review.php"onSubmit="return validate.check(this)"&gt;

                  &lt;div class="side1"&gt;
                  &lt;article&gt;
                        &lt;h2&gt;Silver Name Badges&lt;/h2&gt;
                        &lt;p class="subDetails"&gt;Min. Qty: 100 pcs &lt;br&gt;
                          Lead Time: 3 Weeks&lt;br&gt;
                        &lt;img src="web-pics/name_badge.png" width="200" height="200" alt="badge" /&gt;&lt;br&gt;

                         Quantity:
                    &lt;input type="text" default=min=100 placeholder="none" name="Silver_Name_Badges" id="Silver_Name_Badges" maxlength="10" style="width:50px" tabindex=1  &gt;

                    &lt;/p&gt;
                &lt;/article&gt;


 &lt;td valign="top"&gt;&lt;select name="Ship_Preference" id="Ship_Preference" tabindex=20 &gt;
       &lt;option value="Partial Shipment"&gt;Partial Shipment&lt;/option&gt;
       &lt;option value="When All Items Ready"&gt;Ship When All Items Ready&lt;/option&gt;
       &lt;/select&gt;&lt;/td&gt;
 &lt;td valign="top"&gt;&lt;select name="Ship_Preference" id="Ship_Preference" tabindex=20 &gt;
       &lt;option value="Partial Shipment"&gt;Partial Shipment&lt;/option&gt;
       &lt;option value="When All Items Ready"&gt;Ship When All Items Ready&lt;/option&gt;
       &lt;/select&gt;&lt;/td&gt;
</code></pre>
