Can I use for loops inside switch{} ??

[shachi]

I think that my title says it all. Well, if you don't get what I mean here's what I mean. Can I use for loops in switch statements like this:



switch(somevariable){
for(var i=0;i<somevalue;i++;j=10;j<someothervalue;j++){
case i:
alert(somearray[j]);
break;
}
}


Thank you for your precious time reading my post.

[Twey]

Not like that, no. The question arises, of course, of why you'd want to. The example you've given can be accomplished with:
for(var i = 0; i < somevalue; ++i)
if(somearray[i + 10])
alert(somearray[i + 10]);

[shachi]

Thanks Twey, but how do I use that inside a switch statement??

[Twey]

Why would you want to? The loop I provided duplicates the functionality of what you're trying to do with the pseudo-Javascript above. If you tell us what you're trying to do, we can think of a better way to do it.

[shachi]

I am trying to make a 12 hour clock(maybe there are other easier ways but I want it this way).



d = new Date();
hours = d.getHours();
minutes = d.getMinutes();
seconds = d.getSeconds();
switch(hours){
for(var i=12;i<24;i++;var j=1;j<12;j++){
case i:
hours = j;
break;
}
}
document.getElementById("somediv").innerHTML = hours + minutes + seconds;
setTimeout("somefunc()",1000);

[blm126]

window.onload = startClock;
function startClock(){
setClock();
setInterval("setClock()",1000);
}
function setClock(){
var d = new Date();;
var hours = check(d.getHours());
var minutes = check(d.getMinutes());
var seconds = check(d.getSeconds());
document.getElementById('clock').innerHTML = hours+':'+minutes+':'+seconds
}
function check(num){
if(num<10){
num = '0'+num;
}
return num;
}

Quick javascript clock for you

[Twey]

window.onload = function() {
var a = function(n) {
return (n.toString().length < 2 ? "0" + n : n);
};
var f = function() {
var d = new Date();
window.document.getElementById("clock").firstChild.nodeValue = a(d.getHours()) + ':' + a(d.getMinutes()) + ':' + a(d.getSeconds());
};
f();
window.setInterval(f, 1000);
};

[strikeanywhere]

can someone read http://www.dynamicdrive.com/forums/showthread.php?t=13413 and help me out please... its for school

[Twey]

We don't do homework. Why on earth did you decide to post in this thread?

[mburt]

Quick javascript clock for you

Shachi wanted a *12 hour clock. Not 24 :)

[Twey]

window.onload = function() {
var a = function(n, h) {
return (n.toString().length < 2 ? "0" + n : (h && n > 12 ? n - 12 : n));
};
var f = function() {
var d = new Date();
window.document.getElementById("clock").firstChild.nodeValue = a(d.getHours(), true) + ':' + a(d.getMinutes()) + ':' + a(d.getSeconds());
};
f();
window.setInterval(f, 1000);
};

[mburt]

Your completely right Twey (here I am, talking to a segment of code...) using a switch{} for a simple clock is pointless. Your way is much more effecient.

[mburt]

There has to be some initial text in the "clock" container though. If you leave it blank it won't work.

[blm126]

Shachi wanted a *12 hour clock. Not 24 :)
My bad

[Twey]

True.
window.onload = function() {
var a = function(n, h) {
return (n.toString().length < 2 ? "0" + n : (h && n > 12 ? n - 12 : n));
};
var f = function() {
var d = new Date(),
l = window.document.getElementById("clock");
(l.firstChild || l.appendChild(document.createTextNode(""))).nodeValue = a(d.getHours(), true) + ':' + a(d.getMinutes()) + ':' + a(d.getSeconds());
};
f();
window.setInterval(f, 1000);
};

[shachi]

Thanks Twey,mburt and blm126 for you code. So I can't use loops inside switch can I??

[mwinter]

So I can't use loops inside switch can I??

Not in the way you originally posted, no. The loop must be "within" a case statement:



switch (expression) {
case expression:
for (...) {}
}

Mike

[shachi]

Oh so I can however use loops inside case statements. Thanks mwinter,Twey,mburt and blm126!!!

[Twey]

It should be noted why Mike used quotation marks around "within:" case statements are just labels, and so don't actually have anything within them. The flow of execution jumps to the label then carries on, nothing more.

[shachi]

Ok, Thanks twey, mwinter, mburt, blm126 and everybody. :)