on change event and selection

[Gregc.]

Hi

I am trying to but a function together whereby the user max a selection
and the selection appears in a box on the screen:
function goThere(){
var list = document.forms[0].toy1;
location.href=list.options[list.selectedIndex.value];
}
<select name=toy1 id=toy1 onchange="goThere(this);>
<option1. .....

<select name=toy2 id=toy2 onchange="goThere(this);>
<options>.....

for some reason it isn't working. Could someone steer me in the right
direction.

Greg

[Erwin Moller]

Gregc. wrote:

Hi

I am trying to but a function together whereby the user max a selection
and the selection appears in a box on the screen:
function goThere(){
var list = document.forms[0].toy1;
location.href=list.options[list.selectedIndex.value];
}
<select name=toy1 id=toy1 onchange="goThere(this);>
<option1. .....

<select name=toy2 id=toy2 onchange="goThere(this);>
<options>.....

for some reason it isn't working. Could someone steer me in the right
direction.

Greg

Hi Greg,

You made a few mistakes:
1) illegal functioncall (no arguments)

In your functioncall you give 'this', but in your functiondefinition you do
not receive it, let alone do something with it.

It should be like this:

var num1 = 3;
var num2 = 2;
alert = multiply(num1,num2);

function multiply(n1,n2){
return n1*n2;
}
2) If you use selectedIndex on a select-element, it returns the index (a
number) of the onbe selected. NOT IT'S VALUE.

so:
var theList = document.forms["formnamehere"].selectnamehere;
var selInd = theList.selectedIndex;
var theVal = theList[selInd].value;
location.href=theVal;

That will of course only work if you:
- End your SELECT-elements (which you do not do in the shown code)
- Give each option a value.

3) You didn't give your options-elements a value.

I would also advise you to get a good Javascript book, it is all in there.
(O'Reilly's 'Javascript the Definitive Guide 4th edition' is a good one.
Regards,
Erwin Moller

[Erwin Moller]

alert = multiply(num1,num2);

typo: should be:
alert (multiply(num1,num2));

Regards,
Erwin

[Gregc.]

Erwin Moller wrote:

alert = multiply(num1,num2);

typo: should be:
alert (multiply(num1,num2));

What if you do want an alert box, and want to record the results on the
form.

[Erwin Moller]

Gregc. wrote:

Erwin Moller wrote:

alert = multiply(num1,num2);

typo: should be:
alert (multiply(num1,num2));

What if you do want an alert box, and want to record the results on the
form.

If that is a question, please ask more clearly.

The multiply example was just to show you you need to pass arguments if a
functions expects them.
So multiply(2,3) is allright, but multiply() is not, because the
functiondefinition says it wants 2 arguments.
Regards,
Erwin Moller

[Gregc.]

Erwin Moller wrote:

So multiply(2,3) is allright, but multiply() is not, because the
functiondefinition says it wants 2 arguments.
Regards,
Erwin Moller

Thankyou. It was most helpful.

Greg

[Dr John Stockton]

JRS: In article <44**********************@news.xs4all.nl>, dated Mon,
21 Aug 2006 13:14:40 remote, seen in news:comp.lang.javascript, Erwin
Moller <si******************************************@spam yourself.com>
posted :

>
I would also advise you to get a good Javascript book, it is all in there.
(O'Reilly's 'Javascript the Definitive Guide 4th edition' is a good one.

Have you reasons for not mentioning the 5th Edition, seen to be
described as "soon" on 2006-05-04 ?

<FAQENTRYTo avoid deluding the innocent into buying the 4th Edition if
they'd have preferred the 5th, ISTM that Sec 3.1 needs update.

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

[Erwin Moller]

Dr John Stockton wrote:

JRS: In article <44**********************@news.xs4all.nl>, dated Mon,
21 Aug 2006 13:14:40 remote, seen in news:comp.lang.javascript, Erwin
Moller <si******************************************@spam yourself.com>
posted :

>>
I would also advise you to get a good Javascript book, it is all in there.
(O'Reilly's 'Javascript the Definitive Guide 4th edition' is a good one.

Have you reasons for not mentioning the 5th Edition, seen to be
described as "soon" on 2006-05-04 ?

Hi John,

I haven't seen it yet on the shelfs over here.
That is the only reason. :-)
Next time I'll refer to 'latest edition' which is more safe. :-)

You made me curious: Is the 5th any good above the 4th?
I mean, worth buying if you have the 4th?
What do you think of it?

Regards,
Erwin Moller

>
<FAQENTRYTo avoid deluding the innocent into buying the 4th Edition if
they'd have preferred the 5th, ISTM that Sec 3.1 needs update.

[Dr John Stockton]

JRS: In article <44**********************@news.xs4all.nl>, dated Wed,
23 Aug 2006 11:42:34 remote, seen in news:comp.lang.javascript, Erwin
Moller <si******************************************@spam yourself.com>
posted :

>Dr John Stockton wrote:

>>>I would also advise you to get a good Javascript book, it is all in there.
(O'Reilly's 'Javascript the Definitive Guide 4th edition' is a good one.

Have you reasons for not mentioning the 5th Edition, seen to be
described as "soon" on 2006-05-04 ?

>I haven't seen it yet on the shelfs over here.
That is the only reason. :-)
Next time I'll refer to 'latest edition' which is more safe. :-)

You made me curious: Is the 5th any good above the 4th?
I mean, worth buying if you have the 4th?
What do you think of it?

I've neither got not read it. I think I saw it in a shop, but have not
found any note I may then have taken. I'm not sure what Amazon, etc.,
or O'Reilly say on the Web; perhaps a broadbander would look?

As I don't have the 4th, I would not be able to say whether it would be
worth buying a second copy - depends on how rich one is.

A current Amazon page includes :-

Product Details:
Paperback 1018 pages (August 2006)
Publisher: O'Reilly
Language: English
ISBN: 0596101996
Category(ies): Computers & Internet
Other Editions: Paperback

That's not the ISBN of the 4th, but higher.
Page http://www.davidflanagan.com/javascript5/ exists,

--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 MIME. ©
Web <URL:http://www.merlyn.demon.co.uk/- FAQish topics, acronyms, & links.
I find MiniTrue useful for viewing/searching/altering files, at a DOS prompt;
free, DOS/Win/UNIX, <URL:http://www.idiotsdelight.net/minitrue/>

[Randy Webb]

Dr John Stockton said the following on 8/24/2006 8:23 AM:

JRS: In article <44**********************@news.xs4all.nl>, dated Wed,
23 Aug 2006 11:42:34 remote, seen in news:comp.lang.javascript, Erwin
Moller <si******************************************@spam yourself.com>
posted :

>Dr John Stockton wrote:

>>>I would also advise you to get a good Javascript book, it is all in there.
(O'Reilly's 'Javascript the Definitive Guide 4th edition' is a good one.
Have you reasons for not mentioning the 5th Edition, seen to be
described as "soon" on 2006-05-04 ?

>I haven't seen it yet on the shelfs over here.
That is the only reason. :-)
Next time I'll refer to 'latest edition' which is more safe. :-)

You made me curious: Is the 5th any good above the 4th?
I mean, worth buying if you have the 4th?
What do you think of it?

I've neither got not read it. I think I saw it in a shop, but have not
found any note I may then have taken. I'm not sure what Amazon, etc.,
or O'Reilly say on the Web; perhaps a broadbander would look?

29.69 Used to 32.99 New US Dollars is what is listed on Amazon and
linked to by the URL you give:

Page http://www.davidflanagan.com/javascript5/ exists,

That URL links to the information above.

--
Randy
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