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December 14, 2000 Manipulating Element Coordinates  Tips: December 2000
Yehuda Shiran, Ph.D.
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The browser-independent W3C Standard's
way to set and get an element position is via the style
object's left
and top
properties. Although these properties denote physical measurements, they are strings.
It's important to remember it, or else you'll get into long debugging sessions.
When you need the pure numeric value of either left
or top,
use the parseInt()
method. This method parses a string from left to right, converting the string
to an integer. Parsing stops when there's no way to make an integer out of the
string. For example, parseInt("50px")
is 50.
The following code segment adds 50 pixels to the button's left
property, every time the user clicks the button:
Try it repetitively: Notice that numeric operations (incrementing by 50) are done with the integer-typed xlocation. We set the left value by assembling xlocation and "px".
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