Selecting a SELECT value BY value?

[@sh]

Probably very simple, but I have a SELECT box The value of each option in
the Select box will be a number, for instance...

<option value="5">A test entry</option>

Therefore, how do I, via an onClick, change the selected option of a Select
via the Value of the select only? I can't use the 'selectedIndex' because it
doesn't relate to the value of the option.

Thanks!

[RobG]

Randy Webb said on 23/03/2006 6:50 AM AEST:
[...]

function setSelectObject (val){
var selectObject = document.forms['myForm'].elements['mySelect'];
var k=0;
while (selectObject[k].value != val)
{
k++
}
selectObject.se lectedIndex = k;
}

It will pick up the first option that has the value that you pass it.

Or to get the last one...

function setSelectObject (val)
{
var selectObject = document.forms['myForm'].elements['mySelect'];
var k = selectObject.le ngth;
while (selectObject[--k].value != val){}
selectObject.se lectedIndex = k;
}

:-)

--
Rob

[Erwin Moller]

RobG wrote:

Randy Webb said on 23/03/2006 6:50 AM AEST:
[...]

function setSelectObject (val){
var selectObject = document.forms['myForm'].elements['mySelect'];
var k=0;
while (selectObject[k].value != val)
{
k++
}
selectObject.se lectedIndex = k;
}

It will pick up the first option that has the value that you pass it.

Or to get the last one...

function setSelectObject (val)
{
var selectObject = document.forms['myForm'].elements['mySelect'];
var k = selectObject.le ngth;
while (selectObject[--k].value != val){}
selectObject.se lectedIndex = k;
}

:-)

Hi @sh,

Erwin has nothing more to add to that. :-)
Go use the code.

And I indeed misinterpreted your original question, allthough I prefer the
point of view your question was very vague. ;-)

Regards,
Erwin Moller

[Dr John Stockton]

JRS: In article <_J************ ********@comcas t.com>, dated Wed, 22 Mar
2006 18:53:38 remote, seen in news:comp.lang. javascript, Randy Webb
<Hi************ @aol.com> posted :

No it doesn't. Onclick on a select is like onblur of any other input
element. You don't use it to change/validate things because then you are
repeatedly running code when it isn't needed. onChange will only fire
when it's changed, meaning your code only runs when it needs to.

The programmer must remember that visiting a select and not changing it
can amount to making a selection ("Now I've seen the other options, I
want what was already showing"). So the selection may need to be
validated by something other than its own onChange, perhaps by a "Use
it/them" button. It may be appropriate to process the initial state in
page load, as if it had been selected by the user rather than the
programmer.

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.c om/faq/> JL/RC: FAQ of news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

[Randy Webb]

Dr John Stockton said the following on 3/24/2006 8:36 AM:

JRS: In article <_J************ ********@comcas t.com>, dated Wed, 22 Mar
2006 18:53:38 remote, seen in news:comp.lang. javascript, Randy Webb
<Hi************ @aol.com> posted :

No it doesn't. Onclick on a select is like onblur of any other input
element. You don't use it to change/validate things because then you are
repeatedly running code when it isn't needed. onChange will only fire
when it's changed, meaning your code only runs when it needs to.

The programmer must remember that visiting a select and not changing it
can amount to making a selection ("Now I've seen the other options, I
want what was already showing"). So the selection may need to be
validated by something other than its own onChange, perhaps by a "Use
it/them" button. It may be appropriate to process the initial state in
page load, as if it had been selected by the user rather than the
programmer.

I am not sure I agree with that though. While it is a possibly valid
approach, most Select lists have a first option of something to the
effect of "Choose an Option" and then you validate against that. If it
isn't changed, then you tell them to choose one. And the very scenario
you describe is part of what started that trend.

--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/
Answer:It destroys the order of the conversation

[shadowya]

test

[Randy Webb]

sh******@gmail. com said the following on 3/24/2006 10:32 PM:

test

fail.

alt.test is that way over there ----->

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

[Thomas 'PointedEars' Lahn]

sh******@gmail. com wrote:

test

Test failed.
F'up2 set

PointedEars