assign value to select box ( form validation )

I am creating some form validation, and I have fields working great. The trickyness seems to arise from parsing value from select box

I know how to assign the value within form element, we have:

<select id="sms" name="sms" class="medium">

                                <optgroup label="SMS Alerts">
                                  <option value="">Please choose</option>
                                  <option value="1">Yes</option>
                                  <option value="0">No</option>
                                </optgroup>
                            </select>

But I am not sure what to do within the js for select box.

Currently for a field I have:

$("#mobile").blur(function() { 
        if(validate_form_field($(this), $(this).val().length>9)) {
            mobile_passed = true;
        } else {
            mobile_passed = false;
        }
    });

Essentially, I want to validate that value =1 from select box. Do I do something like ?

$("#sms").blur(function() { 
        if(validate_form_field($(this), $(this).val().length=1)) {
            sms_passed = true;
        } else {
            sms_passed = false;
        }
    });

Cheers Ste

ADDED Info:

The form is to propagate a progress bar.

So here is a portion of the script, split into 3 main parts within js. I have included field and the select box, to see where I am goin wrong.

var mobile_passed = false;
var sms_passed = false;

$("#mobile").blur(function() { 
        if(validate_form_field($(this), $(this).val().length>9)) {
            mobile_passed = true;
        } else {
            mobile_passed = false;
        }
    });

    $("#sms").blur(function() { 
        if(validate_form_field($(this), $(this).val().length=1)) {
            sms_passed = true;
        } else {
            sms_passed = false;
        }
    });

var $object_mobile = $("#mobile");
    no_errors = validate_form_field($object_mobile, $object_mobile.val().length>9);

    var $object_sms = $("#sms");
    no_errors = valid开发者_如何转开发ate_form_field($object_sms, $object_sms.val().length=1);

Plan B

What if I ditch the select box idea, and add an input field as I know these work. But validate if user types YES

How would I achieve that ??

$("#sms").blur(function() { 
    if(validate_form_field($('#sms option:selected').val()), $('#sms option:selected').val().length=1)) {
        sms_passed = true;
    } else {
        sms_passed = false;
    }
});