JavaScript Examples Bible - UserWorks Technologies

Chapter 5 ✦ Body Text Objects (Chapter 19)
Listing 19-4: Lab for NN6 compareBoundaryPoints() Method
TextRange.compareBoundaryPoints() Method
TD {text-align:center}
.propName {font-family:Courier, monospace}
#fixedRangeElem {color:red; font-weight:bold}
var fixedRange
function setAndShowRangeData() {
try {
var selectedRange = window.getSelection()
selectedRange = selectedRange.getRangeAt(0)
var result1 = fixedRange.compareBoundaryPoints(Range.START_TO_END,
selectedRange)
var result2 = fixedRange.compareBoundaryPoints(Range.START_TO_START,
selectedRange)
var result3 = fixedRange.compareBoundaryPoints(Range.END_TO_START,
selectedRange)
var result4 = fixedRange.compareBoundaryPoints(Range.END_TO_END,
selectedRange)
document.getElementById(“B1”).innerHTML = result1
document.getElementById(“compare1”).innerHTML = getDescription(result1)
document.getElementById(“B2”).innerHTML = result2
document.getElementById(“compare2”).innerHTML = getDescription(result2)
document.getElementById(“B3”).innerHTML = result3
document.getElementById(“compare3”).innerHTML = getDescription(result3)
document.getElementById(“B4”).innerHTML = result4
document.getElementById(“compare4”).innerHTML = getDescription(result4)
}
catch(err) {
alert(“Vital Range object services are not yet implemented in this
browser.”)
}
}
function getDescription(comparisonValue) {
switch (comparisonValue) {
case -1 :
return “comes before”
break
case 0 :
return “is the same as”
break
case 1 :
Continued
281
Range.compareBoundaryPoints()