Using getBoundingClientRect()
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/*
JavaScript Bible, Fourth Edition
by Danny Goodman
John Wiley & Sons CopyRight 2001
*/
<HTML>
<HEAD>
<TITLE>getClientRects() and getBoundClientRect() Methods</TITLE>
<SCRIPT LANGUAGE="JavaScript">
function hilite() {
var hTop, hLeft, hRight, hBottom, hWidth
var select = document.forms[0].choice
var n = parseInt(select.options[select.selectedIndex].value) - 1
var clientRects = document.all.main.getClientRects()
var mainElem = document.all.main
if (n >= 0 && n < clientRects.length) {
if (document.forms[0].fullWidth.checked) {
hLeft = mainElem.getBoundingClientRect().left
hRight = mainElem.getBoundingClientRect().right
} else {
hLeft = clientRects[n].left
hRight = clientRects[n].right
}
document.all.hiliter.style.pixelTop = clientRects[n].top +
document.body.scrollTop
document.all.hiliter.style.pixelBottom = clientRects[n].bottom
document.all.hiliter.style.pixelLeft = hLeft + document.body.scrollLeft
document.all.hiliter.style.pixelWidth = hRight - hLeft
document.all.hiliter.style.visibility = "visible"
} else if (n > 0) {
alert("The content does not have that many lines.")
document.all.hiliter.style.visibility = "hidden"
}
}
</SCRIPT>
</HEAD>
<BODY onResize="hilite()">
<H1>getClientRects() and getBoundClientRect() Methods</H1>
<HR>
<FORM>
Choose a line to highlight:
<SELECT NAME="choice" onChange="hilite()">
<OPTION VALUE=0>
<OPTION VALUE=1>1
<OPTION VALUE=2>2
<OPTION VALUE=3>3
<OPTION VALUE=4>4
<OPTION VALUE=5>5
<OPTION VALUE=6>6
<OPTION VALUE=7>7
<OPTION VALUE=8>8
<OPTION VALUE=9>9
<OPTION VALUE=10>10
<OPTION VALUE=11>11
<OPTION VALUE=12>12
<OPTION VALUE=13>13
<OPTION VALUE=14>14
<OPTION VALUE=15>15
</SELECT><BR>
<INPUT NAME="fullWidth" TYPE="checkbox" onClick="hilite()">
Full Width (bounding rectangle)
</FORM>
<SPAN ID="main">
<P>Lorem ipsum dolor sit amet, consectetaur adipisicing elit, sed do
eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim adminim veniam, quis nostrud exercitation ullamco:</P>
<UL>
<LI>laboris
<LI>nisi
<LI>aliquip ex ea commodo
</UL>
<P>Duis aute irure dolor in reprehenderit involuptate velit esse
cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat
cupidatat non proident, sunt in culpa qui officia deseruntmollit
anim id est laborum Et harumd und lookum like Greek to me, dereud
facilis est er expedit distinct.</P>
</SPAN>
<DIV ID="hiliter"
STYLE="position:absolute; background-color:yellow; z-index:-1; visibility:hidden">
</DIV>
</BODY>
</HTML>
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