|
/*
JavaScript Bible, Fourth Edition
by Danny Goodman
John Wiley & Sons CopyRight 2001
*/
<HTML>
<HEAD>
<TITLE>Breaking Out of Nested Labeled Loops</TITLE>
<SCRIPT LANGUAGE="JavaScript">
var targetA = 2
var targetB = 2
var range = 5
function run1() {
var out = document.forms[0].output
out.value = "Running WITHOUT labeled break\n"
for (var i = 0; i <= range; i++) {
out.value += "Outer loop #" + i + "\n"
for (var j = 0; j <= range; j++) {
out.value += " Inner loop #" + j + "\n"
if (i == targetA && j == targetB) {
out.value += "**BREAKING OUT OF INNER LOOP**\n"
break
}
}
}
out.value += "After looping, i = " + i + ", j = " + j + "\n"
}
function run2() {
var out = document.forms[0].output
out.value = "Running WITH labeled break\n"
outerLoop:
for (var i = 0; i <= range; i++) {
out.value += "Outer loop #" + i + "\n"
innerLoop:
for (var j = 0; j <= range; j++) {
out.value += " Inner loop #" + j + "\n"
if (i == targetA && j == targetB) {
out.value += "**BREAKING OUT OF OUTER LOOP**\n"
break outerLoop
}
}
}
out.value += "After looping, i = " + i + ", j = " + j + "\n"
}
</SCRIPT>
</HEAD>
<BODY>
<H1>Breaking Out of Nested Labeled Loops</H1>
<HR>
<P>Look in the Results field for traces of these button scripts:</P>
<FORM>
<P><INPUT TYPE="button" VALUE="Execute WITHOUT Label" onClick="run1()"></P>
<P><INPUT TYPE="button" VALUE="Execute WITH Label" onClick="run2()"></P>
<P>Results:</P>
<TEXTAREA NAME="output" ROWS=43 COLS=60> </TEXTAREA>
</FORM>
</BODY>
</HTML>
|
