Basic array stuff

**richard** · Oct 5 '08, 08:25 PM

Re: Basic array stuff

On Sun, 05 Oct 2008 15:38:49 -0400, sheldonlg <sheldonlgwrote :

>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.

Pleast post question to comp.lang.javas cript.
This group is about basic html.

**Dr J R Stockton** · Oct 5 '08, 10:05 PM

Re: Basic array stuff

On Oct 5, 9:17 pm, richard <mem...@newsguy .comwrote:

On Sun, 05 Oct 2008 15:38:49 -0400, sheldonlg <sheldonlgwrote :

>>

Pleast post question to comp.lang.javas cript.
This group is about basic html.- Hide quoted text -

For one of the two values of this, it is. Check where you are
writing.

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**Jim Moe** · Oct 5 '08, 10:55 PM

Re: Basic array stuff

On 10/05/08 12:38 pm, sheldonlg wrote:

>
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.
>

How is that "array of text fields" created in HTML?

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

PHP is a server-side program. Javascript is a client-side language. What
exists in PHP on the server is not accessible by the client.
Using document.getEle mentById() is ineffective since the ID attribute
must be unique within a document.
Using document.getEle mentsByName() might work by calling it repeatedly
until a null is returned. But not all browsers work that way. (ISTR some
browsers return only the first instance, others only the last, yet others
all of them.)
BTW: What happens for a client that has JS disabled?

>
Any time I create an 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.
>

An URL to a test case would be most useful.

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**sheldonlg** · Oct 6 '08, 01:15 AM

Re: Basic array stuff

I finally got it to where it works (www.sheldonlg.com/t.php)

The simple answer was to have the names and ids all as "a[]". The
javascript does:

obj = document.getEle mentsByName('t[]');

and the values are at obj[i].value.

**Jim Moe** · Oct 6 '08, 05:35 AM

Re: Basic array stuff

On 10/05/08 06:10 pm, sheldonlg wrote:

I finally got it to where it works (www.sheldonlg.com/t.php)
>

Oddly, the "js" button does nothing. Is it supposed to?

The simple answer was to have the names and ids all as "a[]". The
javascript does:
>

And is invalid markup. IDs are required to be unique within a document.

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**Thomas 'PointedEars' Lahn** · Oct 6 '08, 09:35 AM

Re: Basic array stuff

Jim Moe <jmm-list.AXSPAMGN@s ohnen-moe.comwrote:

sheldonlg wrote:

>I finally got it to where it works (www.sheldonlg.com/t.php)

>
Oddly, the "js" button does nothing. Is it supposed to?

It alerts 11 and 22 in a row here. Maybe it does work work with you
because the markup is not Valid, duplicate IDs aside:

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

The simple answer was to have the names and ids all as "a[]". The
javascript does:

>
And is invalid markup. IDs are required to be unique within a document.

But not names.

BTW, you should fix your borken sender address so as to comply with
Internet standards and Netiquette.

F'up2 cljs

PointedEars

**sheldonlg** · Oct 6 '08, 12:15 PM

Re: Basic array stuff

Thomas 'PointedEars' Lahn wrote:

Jim Moe <jmm-list.AXSPAMGN@s ohnen-moe.comwrote:

>sheldonlg wrote:

>>I finally got it to where it works (www.sheldonlg.com/t.php)

> Oddly, the "js" button does nothing. Is it supposed to?

>
It alerts 11 and 22 in a row here. Maybe it does work work with you
because the markup is not Valid, duplicate IDs aside:
>
<http://validator.w3.org/check?verbos...uri=http%3A%2F
%2Fwww.sheldonl g.com%2Ft.php>
>

>>The simple answer was to have the names and ids all as "a[]". The
>>javascript does:

> And is invalid markup. IDs are required to be unique within a document.

>
But not names.
>
BTW, you should fix your borken sender address so as to comply with
Internet standards and Netiquette.
>
>
F'up2 cljs
>
PointedEars

I fixed a couple of errors.

1 - Yes, the ids of t[] can all be removed as there is no need for these
ids and ids should not be duplicates. I used getElementsByNa me.

2 - The complaint about the semi-colon in
for (i=0; i<obj.length; i++) {
is weird. That occurs between a <script></scriptinside the javascript
function. That is a proper specification for a for-loop. Why did it
complain? Here is the function:

<script type="text/javascript">
function dojs() {
var obj = document.getEle mentsByName('t[]');
for (i=0; i<obj.length; i++) {
alert('t[' + i + '] = ' + obj[i].value);
}
}
</script>

**Thomas 'PointedEars' Lahn** · Oct 6 '08, 01:35 PM

Re: Basic array stuff

sheldonlg <sheldonlgwrote :

Thomas 'PointedEars' Lahn wrote:

<http://validator.w3.org/check?verbos...uri=http%3A%2F
%2Fwww.sheldonl g.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:

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

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.

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.

And apparently your sender header is borken as well. Fix it.

PointedEars

**Jim Moe** · Oct 6 '08, 10:05 PM

Re: Basic array stuff

On 10/06/08 02:32 am, Thomas 'PointedEars' Lahn wrote:

>
BTW, you should fix your borken sender address so as to comply with
Internet standards and Netiquette.
>

Please be more specific.

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**sheldonlg** · Oct 9 '08, 10:15 PM

Re: Basic array stuff

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** · Oct 9 '08, 10:45 PM

Re: Basic array stuff

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

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**Thomas 'PointedEars' Lahn** · Oct 10 '08, 06:55 PM

Re: Basic array stuff

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
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Basic array stuff

Basic array stuff

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