Changing installment periodicity dynamcially in the form

[CarolinaTigerRescue]

I have a form, and depending on which UnitPrice1 radio button is selected, the installment and periodcity needs to change. That is, of the unitprice options, some of them are one-time purchase, and some of them are x amount a month for 12 months.

Right now I've got the installment value set to one, and the periodicity set to monthly.

I can use javascript so that if a pay per month option is selected, the installment value is changed to 12.

I'm not really comfortable having the javascript add the hidden inputs for installment and periodicity- since the the user changes their mind and selects a different option, those values wouldn't get changed.

Here's the question- if the installment value is one and the periodicity value is monthly- does this cause any problems for one-time transactions?

for reference: https://savannastation.carolinatigerrescue.org/donate-BigCatDinnerClub.php

[CnP.Support]

Good day!

Installments cannot be set to 1 for the number of payments. The minimum it can be set to is 2 which makes logical sense for the feature.

Experience shows that at times too much automation is not a good thing. Letting the patron choose may make it easier and less prone to error.

Please let me know if I can be of any further assistance.

[CarolinaTigerRescue]

Resolution

This is what I settled on as a solution, and it looks like it's working.

I used the following hidden fields at the beginning of the form

<input type="hidden" name="Installment" id="Installment" value=""/>
<input type="hidden" name="Periodicity" id="Periodicity" value="Month" />

For the options that are one-time payments, the input tag was like this (note the onclick event):

<input type="radio" name="UnitPrice1" id="UnitPrice1" value="240" onclick="javascript:document.getElementById('Insta llment').value=''"/>

for the options that are multiple payments:

<input type="radio" name="UnitPrice1" id="UnitPrice1" value="20" onclick="javascript:document.getElementById('Insta llment').value='12'"/>

This way, the default is no installments, so if javascript is disabled on the browser, they won't be overcharged. I can probably set something up to flag transactions with a multi payment option and without an installment value. If the user changes their mind (clicks on a multi-payment option and then changes it to a single payment option), the value gets set back to nothing.

BTW, in the process, I discovered that if a transaction fails due to an invalid credit card (in this case I was one character short on the test credit card number)- there is no error returned to indicate that this is the problem.

So there ya go!

I have a form, and depending on which UnitPrice1 radio button is selected, the installment and periodcity needs to change. That is, of the unitprice options, some of them are one-time purchase, and some of them are x amount a month for 12 months.

Right now I've got the installment value set to one, and the periodicity set to monthly.

I can use javascript so that if a pay per month option is selected, the installment value is changed to 12.

I'm not really comfortable having the javascript add the hidden inputs for installment and periodicity- since the the user changes their mind and selects a different option, those values wouldn't get changed.

Here's the question- if the installment value is one and the periodicity value is monthly- does this cause any problems for one-time transactions?

for reference: https://savannastation.carolinatigerrescue.org/donate-BigCatDinnerClub.php