form validating function

[mk]

Please, check the source of my test page: http://tnij.org/mytest
Why is it working is such a stupid way in IE and Opera ? I just want to
display alert when field is blurred and it has no value entered and than I
want JS to execute function focus() on that field. I want not to allow user
to leave the field empty once he enters that field. Hope you know what I
mean, look in the source. It works ok in Forefox only. Warning to IE and
Opera users: you'll have to use ctrl+alt+del to close your browser if you
blur any field :(

Regards,
mk

[mk]

U¿ytkownik "Lee" <RE**************@cox.net> napisa³ w wiadomo¶ci
news:e1*********@drn.newsguy.com...

That's expected behavior.
I don't understand at all why but ok, I believe you :)
It's only one of the reasons why you should never try this sort
of validation on blur.

So, how do you suggest to solve the validation ?

Thanks for reply,
mk

[Matt Kruse]

mk wrote:

It's only one of the reasons why you should never try this sort
of validation on blur.

So, how do you suggest to solve the validation ?

Use onChange instead of onBlur.

--
Matt Kruse
http://www.JavascriptToolbox.com
http://www.AjaxToolbox.com

[RobG]

mk wrote:

U¿ytkownik "Lee" <RE**************@cox.net> napisa³ w wiadomo¶ci
news:e1*********@drn.newsguy.com...

[...]

It's only one of the reasons why you should never try this sort
of validation on blur.

So, how do you suggest to solve the validation ?

Write error messages to fields in the page, don't use alerts.
--
Rob

[mk]

Uzytkownik "RobG" <rg***@iinet.net.au> napisal w wiadomosci
news:44***********************@per-qv1-newsreader-01.iinet.net.au...

Write error messages to fields in the page, don't use alerts.

You mean server side validation ? Of course, I'll do this too.

mk

[RobG]

mk wrote:

Uzytkownik "RobG" <rg***@iinet.net.au> napisal w wiadomosci
news:44***********************@per-qv1-newsreader-01.iinet.net.au...

Write error messages to fields in the page, don't use alerts.

You mean server side validation ? Of course, I'll do this too.

Of course do server side validation. But your client script should not use
alerts, it should write messages to the page.
--
Rob

[Thomas 'PointedEars' Lahn]

RobG wrote:

mk wrote:

[...] "RobG" [wrote]:

Write error messages to fields in the page, don't use alerts.

You mean server side validation ? Of course, I'll do this too.

Of course do server side validation. But your client script should not
use alerts, it should write messages to the page.

Wrong as it is. The script could attempt to use DOM methods to modify the
document, but if this fails, window.alert() is a most widely supported
fallback. Unfortunately, it cannot be detected reliably when DOM access
fails.

Therefore, I don't see your point in calling window.alert() generally a Bad
Thing. It certainly is an ennerving Bad Thing if used onblur, but I can
see nothing wrong in using it onsubmit, for example.
PointedEars

[Hal Rosser]

"mk" <no****@wp.pl> wrote in message news:e1*********@news.onet.pl...

Please, check the source of my test page: http://tnij.org/mytest
Why is it working is such a stupid way in IE and Opera ? I just want to
display alert when field is blurred and it has no value entered and than I
want JS to execute function focus() on that field. I want not to allow user to leave the field empty once he enters that field. Hope you know what I
mean, look in the source. It works ok in Forefox only. Warning to IE and
Opera users: you'll have to use ctrl+alt+del to close your browser if you
blur any field :(

Regards,
mk

you could change the background color to get the user's attention if she
leaves it blank:
<input
onchange="this.style.backgroundColor=(this.value== '')?'yellow':'white';" />

[Randy Webb]

Thomas 'PointedEars' Lahn said the following on 4/14/2006 7:16 AM:

RobG wrote:

mk wrote:

[...] "RobG" [wrote]:
Write error messages to fields in the page, don't use alerts.

You mean server side validation ? Of course, I'll do this too. Of course do server side validation. But your client script should not
use alerts, it should write messages to the page.

Wrong as it is.

But it is good advice, not wrong advice.
The script could attempt to use DOM methods to modify the document, but
if this fails, window.alert() is a most widely supported fallback.
Unfortunately, it cannot be detected reliably when DOM access fails.
alerts are as annoying as popups and are subject to some popup blockers.
Therefore, I don't see your point in calling window.alert() generally a Bad
Thing.
He called it a "Bad Thing" because it is a Bad Thing.
It certainly is an ennerving Bad Thing if used onblur, but I can
see nothing wrong in using it onsubmit, for example.

Never been in an endless loop of alerts then have you?

Besides, any site that alerts me to tell me I have something wrong, I
view source and do a submit() on the form. Screw'em.

--
Randy
comp.lang.javascript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

[Hal Rosser]

"mk" <no****@wp.pl> wrote in message news:e1*********@news.onet.pl...

Please, check the source of my test page: http://tnij.org/mytest
Why is it working is such a stupid way in IE and Opera ? I just want to
display alert when field is blurred and it has no value entered and than I
want JS to execute function focus() on that field. I want not to allow user to leave the field empty once he enters that field. Hope you know what I
mean, look in the source. It works ok in Forefox only. Warning to IE and
Opera users: you'll have to use ctrl+alt+del to close your browser if you
blur any field :(

One strategy would be to put a message (like "Field Required") right next to
the text box, in bold and red, and in a span tag with the visibility style
set to 'hidden'. Then use an onchange event to run code that checks the
value, and if the field is empty, set the visibility of the message span to
visible - else set it to hidden.
If you really want to annnoy the user, make it blink. - anything but those
darn alerts.
Hal

[Dr John Stockton]

JRS: In article <%Z*************@bignews2.bellsouth.net>, dated Fri, 14
Apr 2006 16:57:45 remote, seen in news:comp.lang.javascript, Hal Rosser
<hm******@bellsouth.net> posted :

you could change the background color to get the user's attention if she
leaves it blank:
<input
onchange="this.style.backgroundColor=(this.value= ='')?'yellow':'white';" />

IMHO, that could be in breach of disability access legislation, since
some who can manage ordinary text may not be able to discriminate
between white and yellow - particularly on a display where yellow is
feeble.

Reminds me of someone who used a yellow highlighter to mark, on a Xerox
copy of an A-Z page, a route through back streets. Unfortunately, those
streets had Sodium lights ...

Perhaps the best approach would be to use a simulated pop-up - a block
of the page itself which might normally be empty, but shows ostentatious
error messages at need.

--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 MIME. ©
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