JavaScript - Why Does My Average Value Come Up Nan?

Hi,
First i don know if im posting at the right place or if you even take request here, feel free to direct me to the right place.

What i am looking for is someone to make a simple counter for me.
Basically i want that every time i press a certain key on my keyboard it will increase the counter amount and would then divide it by 60 every hour.
Actually im looking for it to only show that average and refresh every hour.
So it would start at 0 then update after the first hour and so on.
(I also need a graphical interface)
I have very few knowledge in coding and would very appreciate if someone could do that for me.

Thank you !





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01-10-2015, 11:39 PM #2
Old Pedant View Profile View Forum Posts

Supreme Master coder! Join Date Feb 2009 Posts 28,311 Thanks 82 Thanked 4,754 Times in 4,716 Posts

I don't think this is something you would do with JavaScript. I think you need a ".exe" (on Windows) program. And that's a lot more complex. The problem is your request to capture a certain key, presumably no matter what window is at the front. Normally, within a given window, you can only capture a key that is intended for that window. I don't think this is a very easy thing to do.

Hi all, I am in a non-major class called webprogramming working with javascript and I'm having an issue with a specific code wondering if someone could tell me what's wrong!

So I am suppose to compute and return the average of all values in a given array named customerBalance, the array holds the amount of "what customers owe my business" (I dont own a business) and each item in the array holds the "customers balance", i also have to use a for() to process the array and calculate the average and divide by customerBalance length, and finally return the average.

Here is my code so far

<script>

function average() {
customerBalance
for(i=0,i++)
sum(customerBalance)
total=sum/5






return average;
};

</script>


I know that this is COMPLETELY wrong, I am not sure on how i start typing the array, please don't be harsh I would really like to know how to do this.

Thank you and have a great day

I've now got to form an average of snowfall inputs, taken from looped prompts, however I'm not allowed to use arrays or functions...

Almost every example I see uses arrays, such as this one he
http://www.codingforums.com/showthread.php?t=4313

Is it possible to not use arrays to form the average? Please describe how to do this in general terms, as was highlighted in that link ^^^ I want to learn, not copy, although one can be derived from the other...

What I haveso far, assume all vars have been announced.
Code:

for (var d=1; d<=numofinputs; d=d+1)
	{ 
		input = prompt("Enter a data input" + d)
	}

Is it possible I'm attempting this in too general a manner? ie, running before I can walk.

I've written a program which will prompt for a number of cities, Prompt for the name of the city, then prompt for the number of snowfall readings of that city, and then prompt for each of these individual snowfall readings of that city. From this, it adds up each of the individual snowfall readings of that city, and will calculate an average by dividing this figure [the total snowfall] by the total number of readings for that city. This average is used to then classify the city as "not snowy", "mild", or "blizzard". I'm happy to PM my code to anyone willing to help out, as I realise this is a complex structure to visualise perhaps, but I can't post it publicly.

I now have to select the city with the highest average, and name it in an alert output. How is this possible.

Note, I'm not allowed to use functions or arrays. Prompts, alerts, if-then-else, for and while loops are all I can use.

I've been messing with this code for about a couple of hours, and I did everything down to the wire..yet still I am unable to get it to work. When I input the numbers, and click off to the side nothing appears down at the final textarea of the form which is suppose to show the average.

I've tried just about everything, sadly all I have to go by is other example codes, and the very intricate instructions which states I must pass the values to the calcAvg() to the second function of performCalc(), which I did, and then I assigned the var calcResult another value. From there I did the return..and after that I'm rather loss as to what to do next to get this code to work, any tips?

Code:

 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Calculation Average</title>
<script type="text/html">
/* <![CDATA[ */


function calcAvg() {
var calcResult=document.numbers.number1.value + document.numbers.number2.value +document.numbers.number3.value + document.numbers.number4.value + document.numbers.number5.value
}
function performCalc() {
var calcResult = calcResult / 5
return calcResult;
}
			
/* This is what I got so far, as you can see I need plenty of help!*/
</script>

</head>
<H1> Calculate Average of Numbers</H1>
<body>

<form action="" name="numbers">
<table>
<tr>
<td>
<tr>
<td>Enter the five numbers:<br />
</td></tr>
<tr><td>
<input type="text" name="number1" size="3"
onchange="calcAvg()" text="0" /></td>
</tr>
<tr>
<td>
<input type="text" name="number2" size="3"
onchange="calcAvg()" text="0" /></td>
</tr>
<tr>
<td>
<input type="text" name="number3" size="3"
onchange="calcAvg()" text="0" /></td>
</tr>
<tr>
<td>
<input type="text" name="number4" size="3"
onchange="calcAvg()" text="0" /></td>
</tr>
<tr>
<td>
<input type="text" name="number5" size="3"
onchange="calcAvg()" text="0" /></td>
</tr>
</table>
</form>


<form action="" name="averageResult">
<p>
Estimate average:
<input type="text" name="average" size="5"
style="border-style: none; border-color:
inherit; border-width: medium;
background-color: Transparent" text="0" /></p>
</form>
</body>
</html>