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Re: on*= Clauses: When to return

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Gene Wirchenko wrote on 06 mrt 2012 in comp.lang.javascript:

> On Mon, 5 Mar 2012 14:03:42 -0700, "Mel Smith"
> <med_cutout_syntel@aol.com> wrote:
> 
>>Gene said:
>>
>>> return and when not to.  For example, with onblur, the return is
>>> needed, as in:
>>>          <input name=Sample onblur="return SampleTest();">
>>
>>    I don't see anywhere in my 'Bible' that the onblur requires a
>>    return 
>>(either true or false).
>>
>>    (But perhaps *you* need a return for you own requirements ?? )
> 
>      How can I tell is the problem.  I am fine with ignoring return
> values if I do not need them.

Wrong conclusion. 
Return values do not ask you if you need them.

> I would like to know if they are
> available, and if they are, what they mean.  That data is sadly
> lacking where I have been looking.

Effectively there always is a return value.
[unless the javascript gives an error, perhaps?]
If there is no return value then true is defaultly assumed.

ONLY a return false acts the prohibit the normal html-action.

Since losing focus has no default html-action, 
the onblurr return value is not used.
[same for onfocus]  

With onclick and onsubmit, however, 
have prohitable default actions:

<a href='..' onclick='return false'>click me and nothing happens</a>

<form onsubmit='return false'>
<input type='submit' value='click me and no submission will be done'>
</form>


-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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Thread

on*= Clauses: When to return Gene Wirchenko <genew@ocis.net> - 2012-03-05 11:20 -0800
  Re: on*= Clauses: When to return "Mel Smith" <med_cutout_syntel@aol.com> - 2012-03-05 14:03 -0700
    Re: on*= Clauses: When to return Gene Wirchenko <genew@ocis.net> - 2012-03-05 15:11 -0800
      Re: on*= Clauses: When to return "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-03-06 12:15 +0000
      Re: on*= Clauses: When to return Dr J R Stockton <reply1210@merlyn.demon.co.uk> - 2012-03-06 19:06 +0000
  Re: on*= Clauses: When to return David Mark <dmark.cinsoft@gmail.com> - 2012-03-12 17:13 -0700
    Re: on*= Clauses: When to return Gene Wirchenko <genew@ocis.net> - 2012-03-12 19:58 -0700
      Re: on*= Clauses: When to return David Mark <dmark.cinsoft@gmail.com> - 2012-03-12 20:20 -0700
        Re: on*= Clauses: When to return Gene Wirchenko <genew@ocis.net> - 2012-03-12 22:15 -0700
          Re: on*= Clauses: When to return David Mark <dmark.cinsoft@gmail.com> - 2012-03-12 22:29 -0700
            Re: on*= Clauses: When to return Gene Wirchenko <genew@ocis.net> - 2012-03-13 08:56 -0700
              Re: on*= Clauses: When to return David Mark <dmark.cinsoft@gmail.com> - 2012-03-13 10:42 -0700
                Re: on*= Clauses: When to return Gene Wirchenko <genew@ocis.net> - 2012-03-13 12:53 -0700
                Re: on*= Clauses: When to return David Mark <dmark.cinsoft@gmail.com> - 2012-03-13 15:18 -0700
                Re: on*= Clauses: When to return Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-03-14 00:17 +0100
                Re: on*= Clauses: When to return Gene Wirchenko <genew@ocis.net> - 2012-03-13 19:48 -0700
                Re: on*= Clauses: When to return David Mark <dmark.cinsoft@gmail.com> - 2012-03-13 20:55 -0700
        Re: on*= Clauses: When to return Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-03-13 23:10 +0100

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