Prevent negative number in calculation

I'm building a simple insurance calculator. All is good except one thing. You can enter your deductible whatever that value is subtracts from the calculated total. The only problem is I don't want to happen if your deductible value is GREATER than or equal to the total.

Is there a simple and clean solution for this? I'd be happy to do it with conditional logic as a solution. This other forum post seemed to indicated I could compare my subtotal: http://www.gravityhelp.com/forums/topic/free-shipping-for-a-certain-postcode-or-if-order-value-is-greater-than-x

However, that doesn't seem to be the case either. My subtotal field is not in the list of options for conditional logic comparison. Although I'm not sure conditional logic would help either way.

Any tips?? Thanks!!

Yes, sorry should have done that in the first place. Form is here:
http://dei.calypsocomhost.com/form/

You have to select "All Insurances" in Step 1. This brings up the "Deductible" field. This is the field that has be greater than the total on Step 4 or else shouldn't be deducted from the total cost. Ex: If the total cost is $110 and you enter 110 as your deductible if should not reduce your total. It should only do so if the deductible is less than total cost.

Hi Chris...Sorry again, let me try to explain it better. I think we should be able to do this with a little bit of jQuery but I'm still trying to figure out how.

Entering a number for the deductible will subtract from the total cost. If the deductible amount is greater than or equal to the cost number, the resulting number would remain the same. (Ex: If cost is 350 and deductible is 5000 the resulting number would be 350). In variable terms it would be as such. Note, using subtotal variable for you because the total is a calculation field.

I'm thinking I need to perform something like this:

if $deductible >= $subtotal; then $deductible = 0;
$subtotal = $subtotal - $deductible;

That really should be all we need to do. The question is how to do this with a combo of jQuery and Gravity Forms.

Thanks!!

Excellent! Once I get the script sorted I can embed it with this -- thanks! Unfortunately I'm having a heck of a time actually getting my script to change the value. I'm also having trouble comparing the values as they are strings not integers. Do I have to strip out all the other characters "." and "," - I've just started by striping the "$" but didn't go further as I wasn't sure if this was the right way to go.

My main issue though is I can't seem to change the value of total. In the code below I just have it trying to replace it with "123". Ultimately I would just add the deductible back into the total if condition below is true.

$("#gform_next_button_2_4").click(function(){
        var deductible = $("#input_2_12").val().replace('$', '');
        var total = $("#ginput_base_price_2_6").val().replace('$', '');
        if ((deductible) >= (total)) {
            $("#ginput_base_price_2_6").val('123');
            $("#input_2_6").val('123');
        }
    });

I know this is above and beyond, but if you have a few moments to look at this awesome. If not, no worries!

Yes, it's at the same place as before... http://dei.calypsocomhost.com/form/

Thanks! And good to know the character stripping is needed...I figured.

Currently the bulk of my scripts, including this one, are in my scripts.js file:
http://dei.calypsocomhost.com/wp-content/themes/imaging/library/js/scripts.js