javascript For statement moving thru rows and cols

Hello Experts

Need to get a JavaScript statement to write out the sequence listed below.

Started with

<script>
var indexRow;
var indexCol;

for (indexRow = 0, indexCol = 0; indexRow = 0, indexCol <= 7; indexCol++)
{
document.write(indexRow + "&nbsp;" +indexCol "<br>" );
}
</script>

Just to get the column to index while the row stays the same
seven times  but this is not working. And I have no
idea how to increment row one after the col gets to seven
and then make the row stay at 2 while the col increments again
and so on.

Any ideas?

Thanks.

Allen in Dallas


+++ Sequence begin+++++++
0 0
0 1
0 2
0 3
0 4
0 5
0 6
0 7
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
2 0
2 1
2 2
......
7 5
7 6
7 7
+++ Sequence end+++++++
LVL 1
Allen PittsBusiness analystAsked:
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Rainer JeschorCommented:
Hi,
this should work:
var indexRow;
var indexCol;

for (indexRow = 0; indexRow <= 7; indexRow++)
{
  for (indexCol = 0; indexCol < 8; indexCol++) {
   document.write(indexRow + "&nbsp;" +indexCol + "<br/>" );
  }
}

Open in new window

You will need two nested for statements.
HTH
Rainer

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Rainer JeschorCommented:
Allen PittsBusiness analystAuthor Commented:
Hello Rainer,

Works great.

Actually this is for a C++ routine that is used in a piece of code
employed by a microprocessor called Ardunio
http://playground.arduino.cc/Main/LedControl#SingleMatrixControl
The excellent nested For statement described would work on
one chip called Max7219  which can control 64 LEDs.
http://tronixstuff.com/2013/10/11/tutorial-arduino-max7219-led-display-driver-ic/
The intent, however is to daisy chain five Max7219's to allow the control of
340 LEDs. (64 x 5)
So the code will have three variables beginning
(0,0,0) to (5,7,7) where the integers indicate
(chip, row, column)
So it is assumed that a third level can be added.

Thanks.

Allen in Dallas
Rainer JeschorCommented:
Hi Allen,

sure - I updated the jsBin sample:
http://jsbin.com/kumuwenido/2

But it would be
0-4 | 0-7 | 0-7

Thanks for the points and good luck with your Ardunio - as soon as my twin boys are old enough, some new gadgets for daddy :-)

KR
Rainer
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