Question by : Javascript OnFocus Help?
I am trying to make a function called ‘setage’ that when you click on the ‘Age’ TextField, it automatically computes the age from the date of birth and displays it in the textbox. I also the age to go down one if the birthdate is past June 1. For some reason, it cannot display it.

function setage (form)
{
var dob = form.birthdate.value;

var mo = dob.substr(0,2);
var day = dob.substr(3,2);
var yr = dob.substr(6,4);

var this_age = 2011 – yr;
if (mm >= 6)
{
this_age–;
}
form.age.value = this_age;
form.submit();
return;
}

Best answer:

Answer by Ratchetr
If you run in FireFox, click in the age box, then look in the error console (tools menu), you’ll see:
Error: mm is not defined

You declared variable mo, but you are using mm in the if statement.

What do you think? Answer below!

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Question by David P: html / JAVASCRIPT HELP. I’m a javascript beginner. Please help.?
What I am trying to do it put in a text box and have a button. All I am trying to do right now is to do a document.write statement (or if there is something better) to actually display what I have in the box. Example:
text box = “test”
button = “click me”
document.write = “test”

So I am trying to display what the text box has. I am going to them move to the same thing with multiple text boxes and do some simple math. Here is my code.

Thanks everyone.

Best answer:

Answer by Samwise
First, you shouldn’t combine a