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define an integer variable appended with px

Posted on 2006-06-10
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Medium Priority
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Last Modified: 2012-08-13
basically the script below modifies some CSS to scroll down a div menu, the problem is it doesnt seem to scroll down in pixels ( if i change for example "(<37)" to "(<36)" the layer actually repositions by roughly 10pixels.

var i=-150;
var intHide;

function show()
{
if (i<37)
      {
      i=i+4;
      document.all("foo").style.top=i-1;
      }
}

function showmenu()
{
clearInterval(intHide);
intShow=setInterval("show()",1);
}

function hide()
{
if (i>-150)
      {
      i=i-4;
      document.all("foo").style.top=i;
      }
}

function hidemenu()
{
clearInterval(intShow);
intHide=setInterval("hide()",1);
}
0
Comment
Question by:Gareth Pritchard
  • 2
3 Comments
 
LVL 63

Accepted Solution

by:
Zvonko earned 1200 total points
ID: 16876764
9*4 = 36
So when you let the limit be 37 you jump one step further to 10*4
 Comment the 4-step out and look for the pixel behavior:
   // i=i+4;

0
 
LVL 5

Author Comment

by:Gareth Pritchard
ID: 16876876
nice, thanks for the tip-off :)

if (i<39)
      {
      i=i+4;
      document.all("foo").style.top=i-3;
                }

you have earned the points:

just to clarify, where did you get 9*4=36 based on the script ?
i see the *4 is from i+i=4;
i understand the mathematics behind the problem ( thanks to your explanation ),
i just dont see where the 9* comes into it.

0
 
LVL 63

Expert Comment

by:Zvonko
ID: 16876922
Sorry, the guess with nine was wrong. You start from minus 150 and go to 36 or 37. Therefore you have either 46 or 47 steps each 4 pixels.

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