js error
Alexandre Jaquet
and when I delete the image the code doesn't work anymore :
<script type='text/javascript'>
function Go(){return}
</script>
<!-- this line leave an error !-->
<IMG alt="" src="images/SMALL_ABUZ_RECORDS.JPG" align="middle" />
<script type='text/javascript' src='scripts/exmplmenu_var.js'></script>
<script type='text/javascript' src='scripts/menu_com.js'></script>
Daniel Kirsch
This should work.
You either deleted more than just that line or your js files contain
code, that's based on the image's existence.
Without seeing that code (give a URL) one can only guess.
Daniel
Randy Webb
> Hi I couldn't understand why in my web page when I've an image the page work
> and when I delete the image the code doesn't work anymore :
>
> <script type='text/javascript'>
> function Go(){return}
> </script>
> <!-- this line leave an error !-->
Yes, as it should.
function Go() {return true}
or
function Go() {return false}
When you use return, you have to return something. Not just return.
--
Randy
comp.lang.javascript FAQ - http://jibbering.com/faq
Daniel Kirsch
> When you use return, you have to return something. Not just return.
This might be good style but it's not necessary. If you use return only,
the returned value is undefined but it's still a valid script.
Daniel
Dave Anderson
>
> function Go() {return true}
> or
> function Go() {return false}
>
>
> When you use return, you have to return something. Not just return.
Not according to ECMA-262v3, 12.9:
ReturnStatement :
return [no LineTerminator here] Expression(opt);
Semantics
An ECMAScript program is considered syntactically incorrect
if it contains a return statement that is not within a
FunctionBody. A return statement causes a function to cease
execution and return a value to the caller. If Expression is
omitted, the return value is undefined. Otherwise, the
return value is the value of Expression.
--
Dave Anderson
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Randy Webb
I guess it depends on what you define as a "valid" script. :-)
If you aren't going to return anything, no need to return at all.
Daniel Kirsch
> If you aren't going to return anything, no need to return at all.
Well, if you don't have to return anything but have to return before
reaching the method's end, using just return might be good practice:
function foo(arg) {
if (!arg) return;
// do something();
}
This way, the method will always return undefined.
Of course, you could also write
function foo(arg) {
if (arg) {
// do something();
}
}
But this often makes a script less readable, especially if used with
more if statements.
Daniel