Basic array stuff

[sheldonlg]

This is kind of basic, and I googled but didn't find much help.

I have an array of text element fields. They all need to have the same
name. So, let the name be either all with a[] or build individually as
a[0], a[1], a[2], etc. The brackets need to be there because I will
obtaining the values of them as an array using $_POST{'a'] in php.

What I want to do is in javascript set the value of an individual
element, say a[3]. I have tried many combinations of

1 - setting the ids all as
a) a
b) a[]
c) individually as a[0], a[1], etc.
2 - using document.getEle mentById
3 - using document.getEle mentsByName

Any time I create and object from the name, and then try to use that
object, I get "object has no properties" in Firebug. This is true
whether I try obj.value or obj[i].value.

So, please,
1 - How do I set the id attribute?
2 - How do I access or set an individual member in the array?
3 - For the name attribute, should I use a[] or individually build them
or does it not matter as far as javascript is concerned?

Yes, this is basic, but I have been going in circles for a few hours now
so any help will be appreciated.

[sheldonlg]

Thomas 'PointedEars' Lahn wrote:

sheldonlg <sheldonlgwrote :

>Thomas 'PointedEars' Lahn wrote:

>><http://validator.w3.org/check?verbos...uri=http%3A%2F
%2Fwww.sheldo nlg.com%2Ft.php >

[...]
2 - The complaint about the semi-colon in
for (i=0; i<obj.length; i++) {

You did to declare `i', which is error-prone, and you have a property
resolved repeatedly, which is inefficient:

OK, I can but the resolving being inefficient and should have simply set
it once. However, I just don't understand what you are saying about

`i'

Where did I use that accent mark before the "i"?

>
for (var i = 0, len = obj.lengh; i < len; i++)
{

I think you have a typo here.

>is weird. That occurs between a <script></scriptinside the javascript
function. That is a proper specification for a for-loop. Why did it
complain?

Because in XHTML the content model of the `script' element is PCDATA,
not CDATA as in HTML. Therefore, `<' is regarded an STAGO (Start Tag
Open) delimiter and `;' is not part of a proper attribute name that is
expected in a start tag.

I don't understand what you are saying. Do you mean that because it is
defined as xhtml, that even though it is inside a javascript it treats
the "<" as an opening of a tag rather than as a "less than"? Is so,
then why would your suggestion abovenot have a complaint?

>
While the solutions for this "problem" are simple and have been
discussed also here several times -- Google is your friend [psf 6.1]
--, you should simply not declare XHTML when you don't know what you
are doing.

Apparently my default template in Dreamweaver for a new PHP file
produces that. I didn't pay much attention to it when I composed the
example case.

[Gregor Kofler]

sheldonlg meinte:

OK, I can but the resolving being inefficient and should have simply set
it once. However, I just don't understand what you are saying about

`i'

Where did I use that accent mark before the "i"?

You should add *var* to declare it as a local variable. Perhaps you
should try JSLint to "validate" your scripts. It's a bit harsh on code
not following its guidelines, but a great tool to find such issues.

> for (var i = 0, len = obj.lengh; i < len; i++)

I think you have a typo here.

Yes, it should read "length".

>Because in XHTML the content model of the `script' element is PCDATA,
not CDATA as in HTML. Therefore, `<' is regarded an STAGO (Start Tag
Open) delimiter and `;' is not part of a proper attribute name that is
expected in a start tag.

I don't understand what you are saying. Do you mean that because it is
defined as xhtml, that even though it is inside a javascript it treats
the "<" as an opening of a tag rather than as a "less than"?

Yes.

Gregor
--
http://photo.gregorkofler.at ::: Landschafts- und Reisefotografie
http://web.gregorkofler.com ::: meine JS-Spielwiese
http://www.image2d.com ::: Bildagentur für den alpinen Raum

[Thomas 'PointedEars' Lahn]

Thomas 'PointedEars' Lahn wrote:

sheldonlg <sheldonlgwrote :

> for (i=0; i<obj.length; i++) {

JFTR:

You did to declare `i', which is error-prone, and you have a property

s/to/not/

resolved repeatedly, which is inefficient:

for (var i = 0, len = obj.lengh; i < len; i++)
{

for (var i = 0, len = obj.length; i < len; i++)
{
PointedEars
--
var bugRiddenCrashP ronePieceOfJunk = (
navigator.userA gent.indexOf('M SIE 5') != -1
&& navigator.userA gent.indexOf('M ac') != -1
) // Plone, register_functi on.js:16