append a number to a form variable inside function

[mat41]

Hello Javascript gurus. This part of a function is troubling me, am I on the rite track?

for (i = 1; i < theForm.ExtraHourPossibles.value; i++)
{
var fname = theForm.extraHours+i.value
alert(fname);
}

Specifically this line:
var fname = theForm.extraHours+i.value

My objective is for the fname value to generate:
theForm.extraHours1.value
theForm.extraHours2.value
theForm.extraHours3.value
theForm.extraHours4.value

Thankyou in advance

 

[dwarfthrower]

var fname = theForm["extraHours" + i].value                    
alert(fname);

_{Never be afraid to share your dreams with the world.
There's nothing the world loves more than the taste of really sweet dreams.}
Webflo

 

[mat41]

Nice!!!! I would never have tried it without the period after the 'm' in 'form' (how does it know?)

you have a fine day )

 

[dwarfthrower]

how does it know?

It knows because it's one of the standard ways of accessing an object's properties.

http://www.learn-javascript-tutorial.com/

_{Never be afraid to share your dreams with the world.
There's nothing the world loves more than the taste of really sweet dreams.}
Webflo

 

[mat41]

May I trouble you for another help?

for (i = 1; i < theForm.ExtraHourPossibles.value; i++)
{
var fname = theForm["extraHours" + i].value
if (fname != "") && (isNaN(parseInt(fname)))
{
alert("Additional hours must be valid numbers only.");
}
}

Can I not do this?
if (fname != "") && (isNaN(parseInt(fname)))
my objective is to say if there is some syntax present it must be a number

Thank you in advance

 

[mat41]

Problem solved looks like I was missing a set of (). the following worked

if ((isNaN(parseInt(fname))) && (fname != ""))