Stop Javascript execution safely?

[howa]

Are there any method to stop the current JS execution on a page
safely, something like PHP's die() functuin ?

 

[Erwin Moller]

Are there any method to stop the current JS execution on a page
safely, something like PHP's die() functuin ?

Hi,

From Javascript itself on the page?
As far as I know: No.

You could of course wrap every javascript-command and function in an
if-then block, checking if the command should run.

Why would you want such a thing in the first place?

Regards,
Erwin Moller

 

[nas_bk]

exit(0);

 

[Thomas 'PointedEars' Lahn]

exit(0);

troff


PointedEars

 

[michael]

Are there any method to stop the current JS execution on a page
safely, something like PHP's die() functuin ?

Hi Howa,

Yes javascript does come with error handling, and it work's just like
java.

try{
var myObj = document.missing.element;
} catch (e) {
alert('Error looking for document.missing.element\n' + e);
}

Hope it helps

//Michael

 

[Thomas 'PointedEars' Lahn]

Are there any method to stop the current JS execution on a page
safely, something like PHP's die() functuin ?

[...]
Yes javascript does come with error handling, and it work's just like
java.

It doesn't. At least not everywhere.

try{
var myObj = document.missing.element;
} catch (e) {
alert('Error looking for document.missing.element\n' + e);

If would have been easier to display the value of e.message or a similar
property.

}

That is falsely assuming error handling would be equivalent to stopping
execution with PHP's die(). To stop execution this way, one would have
to cause a run-time error deliberately, which is bad style, even in Java.
An example of a better way would be

var statements, foo = true;

try
{
statements;
if (foo) throw new Error("bar");
}
catch (e)
{
window.alert(e.message);
}

But one would have to rely on support for exceptions in either case here.

However, your reply indicates the very simple and fully compatible solution
to this actually minor problem: instead of stopping execution when a
condition applies, have the following code only executed if it doesn't.


PointedEars