JavaScript - How to add preset values to form input forselect box

I want to allow users to inout a production date and then have a slect box
below that uses that inout value to calculate 2, 3, and 6 month end point dates
all on the same form. Can some one show me how? I regualrly code in HTML and
Cold Fusion, but am not so hot on JS techniques - usually find sample online
and edit to suit - couldn't find anything for this one.

I would imagine an onblur action from the text input field that sets values
for the select box - much like related select, I guess... just need some
assistance getting it set up.

Thanks!

Jonathan,

Probably several ways to do this, but here's one. Note that in this example
the <form> is named 'testform' and the <select> is named 'newdate'. The
entered date takes the form of M/D/YYYY with no need for leading zeros on
single digit months and days.

Hope it helps.

Javascript code (triggered onBlur of the text field):



function update() {
var newdates = Array(2,3,6);
for(i=0; i<newdates.length; i++) {
var date = document.testform.date.value;
var splits = date.split('/');
splits[0] = newdates[i] + eval(splits[0]);
if(splits[0] > 12) {
splits[0] = splits[0] - 12;
splits[2] = eval(splits[2]) + 1;
}
var reformed_date = splits[0] + '/' + splits[1] + '/' + splits[2];
document.testform.newdate.options[i] = new Option(reformed_date,
reformed_date);
}
}