Checkbox and text box on form

big-dog

Is there a way to have a checkbox populate a textbox with a value?
I have three checkboxes on a form each representing a different value. 45 , 20 , 60 If for instance the 1st checkbox is checked then 45 would show up in a textbox if the second is check then 20 would show in the textbox.. and so on. There’s only one textbox and only one checkbox can be used at a time.
The form is html and php information is stored on a mysgl database.
See excample here click the X in the upper left hand corner of page. the checkboxes are the membership options and the text box is amount box at bottom.

etully

You probably want to do that in Javascript so that it's fast and immediate. You could do it with PHP but it forces the whole page to refresh which is both slow and unnecessary.

I Googled this:
javascript checkbox populates text field

and found this:
http://www.codingforums.com/archive/index.php?t-36460.html

big-dog

It seems to do what I want sort of, but has error if you uncheck a box and also only one box should beable to be checked.
I created radio buttons insted and it does good, now my question is how do I hide the last radio button in the form.
and since I created a form and it made a sql database will changing the checkboxes on the for to radio buttons affect the database information for the checkboxes

<html>

<head>
<script type="text/javascript">
function addVal(newVal, dest, addOrRemove) {
if (addOrRemove) { // true == add; false == remove;
if (dest.value.length != 0) {
dest.value= "";
}
dest.value += newVal;
} else {
dest.value.replace(new RegExp("[, ]?" + value, "ig"), "");
}
}
</script>

</head>

<body>

</html>