The use of Javascript to calculate monthly payments on form

I have a form one page where I want to be able to allow the user to choose between making a time payment or monthly payments for an amount defined by the user. I could easily penetrate the shape of two pages and calculate the value of monthly payments and post it on the second page, if the user has selected the monthly payment option. What I would like is a single page where the monthly payment is determined on the fly when the user selects the box of monthly payment option or the user defined amount is entered.

I think I have the function determined to do the calculation for the monthly payment, but I'm not sure how to get CF to read or display the value. I tried to use the following with no luck:

< input type = radio name = value of payments = "Yes" tabindex = 1 onClick = "calculatemonthlypayment (return [0].). DonationAmount) ">"

< script type = "text/javascript" >
function calculatemonthlypayment (donation)
{
monthlypayment =(donation/12)
}
return monthlypayment
< /script >

You try the result like this:

< cfoutput > < input type = "text" readonly = "yes" value = "#dollarformat (monthlypayment) #" > < / cfoutput >

No idea I'm doing wrong or missing? Or is there a better way to do this?

>

You can't do that. CF code runs on the server (the first). The javascript that results (html, css,...) is sent to the browser where it is running. Given that the javascript code is executed in the client browser, after the CF code is already completed, the variable "monthlypayment" does not exist that CF is concerned.

You can use javascript to read the amount of the donation text field and calculate the amount of "monthlypayment" to display. Here's a simple example. You will need to add validation and formatting number.

Tags: ColdFusion

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