PHP-Javascript method for auto-selecting checkbox groups

[Phil Powell]

I am producing a form using PHP on the back end and Javascript on the
front end. The resulting script will come to the browser as follows:

<script>
<!--
function selectAll() {
moveElement = eval("document.imageForm.move" + "[]");
alert(moveElement);
if (document.imageForm.select_all[0].checked) {
for (i = 0; i < document.imageForm.move.length; i++) {
document.imageForm.move[i].checked = true;
}
}
}
 
function deSelectAll() {
if (!document.imageForm.select_all[0].checked ||
document.imageForm.deselect_all[0].checked) {
for (i = 0; i < document.imageForm.move.length; i++) {
document.imageForm.move[i].checked = false;
}
}
}
//-->
</script>
 

This will work with a checkbox group that has to have this naming
convention for PHP:

<input type=checkbox name=move[] value="myImage.gif"> - Move?
 

I will also have a checkbox that will "select all" and "de-select
all":

<input type=checkbox name=select_all value=1 onChange="selectAll()"> -
Select All&nbsp;&nbsp;
<input type=checkbox name=deselect_all value=1
onChange="deSelectAll()"> - De-select All
 

I am not familiar at how Javascript can work with non-standard naming
conventions for event actions, can someone tell me what I'm doing
wrong? This fails at least in Mozilla 1.6

Thanx
Phil

[Matt Kruse]

"Phil Powell" <so*****@erols.com> wrote:

This will work with a checkbox group that has to have this naming
convention for PHP:
I will also have a checkbox that will "select all" and "de-select
all":

Checkboxes don't have onChange() events, they have onclick() events.

If you want to ease your pain a bit, you could consider using my "Checkbox
Group" library, which would handle all this for you quite easily:
http://www.mattkruse.com/javascript/checkboxgroup/

--
Matt Kruse
Javascript Toolbox: http://www.mattkruse.com/javascript/

[Henk Burgstra]

On Tue, 13 Apr 2004 12:22:45 -0700, Phil Powell wrote:

I am not familiar at how Javascript can work with non-standard naming
conventions for event actions, can someone tell me what I'm doing
wrong? This fails at least in Mozilla 1.6

Give your checkboxex an id and use document.getElementById() to select
them in Javascript.

You can dynamically create your selectAll() function from PHP the same way
you create your checkboxes

function selectAll() {
document.getElementById('1').checked = true;
// ...
document.getElementById('10').checked = true;
}

Regards,
Henk Burgstra

[Henk Burgstra]

> I am not familiar at how Javascript can work with non-standard naming

conventions for event actions, can someone tell me what I'm doing
wrong? This fails at least in Mozilla 1.6

Give your checkboxes an id and use document.getElementById() to select
them in Javascript.

You can dynamically create your selectAll() function from PHP the same way
you create your checkboxes

function selectAll() {
document.getElementById('1').checked = true;
// ...
document.getElementById('10').checked = true;
}

Regards,
Henk Burgstra

[Reply Via Newsgroup]

Phil Powell wrote:

I am producing a form using PHP on the back end and Javascript on the
front end. The resulting script will come to the browser as follows:

 <script>
 <!--
   function selectAll() {
    moveElement = eval("document.imageForm.move" + "[]");
    alert(moveElement);
    if (document.imageForm.select_all[0].checked) {
     for (i = 0; i < document.imageForm.move.length; i++) {
      document.imageForm.move[i].checked = true;
     }
   }
  }

  function deSelectAll() {
   if (!document.imageForm.select_all[0].checked ||
 document.imageForm.deselect_all[0].checked) {
    for (i = 0; i < document.imageForm.move.length; i++) {
     document.imageForm.move[i].checked = false;
    }
   }
  }
 //-->
 </script>
 

This will work with a checkbox group that has to have this naming
convention for PHP:

 <input type=checkbox name=move[] value="myImage.gif"> - Move?
 

I will also have a checkbox that will "select all" and "de-select
all":

 <input type=checkbox name=select_all value=1 onChange="selectAll()"> -
 Select All&nbsp;&nbsp;
 <input type=checkbox name=deselect_all value=1
 onChange="deSelectAll()"> - De-select All
 

I am not familiar at how Javascript can work with non-standard naming
conventions for event actions, can someone tell me what I'm doing
wrong? This fails at least in Mozilla 1.6

Thanx
Phil

Your problem is reasonably common (search google groups for select box
and php and I'm sure you'll find a few recent posts (one or two from me)
related to this.

However... there are two methods that you can use to refer to an object
in a form in javascript - I'm a newbie (six months) but think I'm
getting pretty strong... someone though might have some other
method/solution... however, use something like

boxLength=document.forms["formGroups"].elements["userSelected[]"].length;

where by 'formGroups' is the name of your form and 'userSelect[]' is the
name of your select box.

Using my above example, boxLength would equal the total number of
selections in a multi-select box.

Also... put quotes around your INPUT TAG name field... thus

Use <input type=checkbox name="move[]" value="myImage.gif"> not <input type=checkbox name=move[] value="myImage.gif">

as the [] might cause some grief on some web browsers...

Lastly - I just learned that a mis-use of eval is common - there are
other methods that you can use that use less resources and faster (for
example, from a numeric point of view you could use something like
parseInt() - Do a search on google groups for a recent message I got
which explains the reasons - search for "why is eval evil" in
comp.lang.javascript for a detailed explanation.

Hope something above gives you some help...

Regards
Randell D.

[Phil Powell]

Following occurred when my colleague tested on his machine using IE
6.0 SP 4 for Win2000 (I am using Linux/Mozilla):

Ok, back to the drawing board, it didn't work when my colleague tested
on his machine using IE 6.0 SP4 for Win2K:

I tried with the HTML code below, but IE spat out the following:

Line: 42
Char: 1
Error: 'document.imageForm.move[]' is null or not an object
Code: 0
URL: file://C:\Documents and Settings\eduardo\Desktop\test.html

HTML code:

<html>
<head>
<title></title>
<body>
<script>
<!--
~ function selectAll(checkState, selectStatus, obj) {
~ if (document.imageForm.select_all.checked ||
document.imageForm.deselect_all.checked) {
~ for (i = 0; i < obj.length; i++) {
~ obj[i].checked = checkState;
~ }
~ if (selectStatus.toLowerCase() == 'select')
document.imageForm.deselect_all.checked = false;
~ if (selectStatus.toLowerCase() == 'deselect')
document.imageForm.select_all.checked = false;
~ }
}
//-->
</script>

<table>
<tr>
~ <td bgcolor=ffffff><a
href="./images/mu-spin/kyrka.jpg">kyrka.jpg</a></td>
~ <td bgcolor=ffffff>Show Metadata</td>
~ <td bgcolor=ffffff><input type=checkbox name="move[]"
value="kyrka.jpg"> - Move?</td>

</tr>
<tr>
~ <td bgcolor=ffffcc><a
href="./images/mu-spin/banner.jpg.jpeg">banner.jpg.jpeg</a></td>
~ <td bgcolor=ffffcc><a
href=index.php?section=image&action=edit&chooseAlb um=1&album=mu-spin&id=147>Show
Metadata</a></td>
~ <td bgcolor=ffffcc><input type=checkbox name="move[]"
value="banner.jpg.jpeg"> - Move?</td>
</tr>
<tr>

~ <td bgcolor=ffffff><a
href="./images/mu-spin/kyrka_gray.jpg">kyrka_gray.jpg</a></td>
~ <td bgcolor=ffffff><a
href=index.php?section=image&action=edit&chooseAlb um=1&album=mu-spin&id=145>Show
Metadata</a></td>
~ <td bgcolor=ffffff><input type=checkbox name="move[]"
value="kyrka_gray.jpg"> - Move?</td>
</tr>
<tr>
~ <td colspan=3 bgcolor=ddddee>
~ <input type=checkbox name="select_all" value=1
onClick="selectAll(true, 'select', document.imageForm['move[]'])"> -
Select All&nbsp;&nbsp;<input type=checkbox name="deselect_all" value=1
onClick="selectAll(false, 'deselect', document.imageForm['move[]'])">
-
De-Select All</td>

</tr>
</table>
</body>
</html>

Phil

"Matt Kruse" <ne********@mattkruse.com> wrote in message news:<c5*********@news3.newsguy.com>...

"Phil Powell" <so*****@erols.com> wrote:

This will work with a checkbox group that has to have this naming
convention for PHP:
I will also have a checkbox that will "select all" and "de-select
all":

Checkboxes don't have onChange() events, they have onclick() events.

If you want to ease your pain a bit, you could consider using my "Checkbox
Group" library, which would handle all this for you quite easily:
http://www.mattkruse.com/javascript/checkboxgroup/

[Phil Powell]

Does this work in IE and Opera? I have no way of testing in either
browser as I am on a Linux box and have no rights to install anything
onto it.

Phil

Henk Burgstra <eg****@xs4all.nl> wrote in message news:<pa****************************@xs4all.nl>...

I am not familiar at how Javascript can work with non-standard naming
conventions for event actions, can someone tell me what I'm doing
wrong? This fails at least in Mozilla 1.6

Give your checkboxes an id and use document.getElementById() to select
them in Javascript.

You can dynamically create your selectAll() function from PHP the same way
you create your checkboxes

function selectAll() {
document.getElementById('1').checked = true;
// ...
document.getElementById('10').checked = true;
}

Regards,
Henk Burgstra

[Henk Burgstra]

On Wed, 14 Apr 2004 06:33:35 -0700, Phil Powell wrote:

Give your checkboxes an id and use document.getElementById() to select
them in Javascript.

You can dynamically create your selectAll() function from PHP the same way
you create your checkboxes

function selectAll() {
document.getElementById('1').checked = true;
// ...
document.getElementById('10').checked = true;
}

Regards,
Henk Burgstra

Does this work in IE and Opera? I have no way of testing in either
browser as I am on a Linux box and have no rights to install anything
onto it.

Phil

Yes, it does. I know it works in IE and I tested it for you in Opera 7.50
/ Linux
Please don't top post.

Regards,
Henk Burgstra

[Matt Kruse]

"Phil Powell" <so*****@erols.com> wrote in message
news:1c**************************@posting.google.c om...

Following occurred when my colleague tested on his machine using IE
6.0 SP 4 for Win2000 (I am using Linux/Mozilla):

Aren't you missing a <form> tag entirely?

--
Matt Kruse
Javascript Toolbox: http://www.mattkruse.com/javascript/

[Dr John Stockton]

JRS: In article <Gg1fc.110637$oR5.109407@pd7tw3no>, seen in
news:comp.lang.javascript, Reply Via Newsgroup <reply-to-
ne*******@please.com> posted at Wed, 14 Apr 2004 02:23:34 :

- I'm a newbie (six months) Lastly - I just learned that a mis-use of eval is common - there are
other methods that you can use that use less resources and faster (for
example, from a numeric point of view you could use something like
parseInt() - Do a search on google groups for a recent message I got
which explains the reasons - search for "why is eval evil" in
comp.lang.javascript for a detailed explanation.

For that, the OP should be referred to the c.l.j newsgroup FAQ. It's
generally better to cite a specific reference rather than to call for a
search.

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