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.

[richard]

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]

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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FAQish topics, acronyms, links, etc.; Date, Delphi, JavaScript, ....|

[Jim Moe]

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.

--
jmm (hyphen) list (at) sohnen-moe (dot) com
(Remove .AXSPAMGN for email)

[sheldonlg]

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]

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]

Jim Moe <jm************ ***@sohnen-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]

Thomas 'PointedEars' Lahn wrote:

Jim Moe <jm************ ***@sohnen-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]

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]

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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