checkbox to enable / disable hidden fields?

[John]

Hello.

I have a search form for music albums which among other things I need to
search all the song titles of the song. Normally in a search form I would
have checkboxes the user can use to select whether or not to search a given
field.

In this case it is not practical to have 20 checkboxes (each album can have
up to 20 song titles).

What I would rather do is have a single checkbox labeled "search song
titles" and have all the song title fields hidden and either enabled or
disabled as part of the search depending on the checked state of that check
box.

The hidden fields in question look like this:

<input type="hidden" name="SearchAdd _1" value="1">
<input type="hidden" name="SearchAdd _2" value="1">
etc
etc
all the way to
<input type="hidden" name="SearchAdd _20" value="1">

So if I simply put all those in the search form then it will search those
fields. Great. But how would I give the user the option to toggle them
off or on in one shot?

Thanks.

[Danny]

Re: checkbox to enable / disable hidden fields?


If the fields are 'hidden', there isn't much point on disabling them,
unless you wish them disabled for them not to send along, which disabled
fields do, you can do quite a few on an event like in this case, onclick on
a checkbox, but you need to be specific on what you want, but is rather
quite simple to do using a For loop.


Danny

[John]

Re: checkbox to enable / disable hidden fields?

Sorry, should have been more specific. Yes, what I mean is I want them all
to not get sent along in the form. So effectively I need them to change
from:

<input type="hidden" name="SearchAdd _1" value="1">

to

<input type="hidden" name="SearchAdd _1" value="0">

If a checkbox is unchecked, and back to 1 if it is checked.

dann90038@blueb ottle.com (Danny) wrote in
<1126325189.df9 99db5e087b893cb bc22d75bbbf24e@ teranews>:
[color=blue]
>
> If the fields are 'hidden', there isn't much point on disabling
> them,
>unless you wish them disabled for them not to send along, which disabled
>fields do, you can do quite a few on an event like in this case, onclick
>on a checkbox, but you need to be specific on what you want, but is
>rather quite simple to do using a For loop.
>
>
> Danny
>[/color]

[David Dorward]

Re: checkbox to enable / disable hidden fields?

John wrote:
[color=blue]
> I have a search form for music albums which among other things I need to
> search all the song titles of the song. Normally in a search form I would
> have checkboxes the user can use to select whether or not to search a
> given field.
>
> In this case it is not practical to have 20 checkboxes (each album can
> have up to 20 song titles).[/color]

I'd do this on the server:

Pseudo code:

if (defined $album_to_searc h) {
push @songs_to_searc h, get_list_of_son g_ids_from_albu mid($album_to_s earch);
}

Much more reliable, and it doesn't require you to shunt all the song names
to the client each time.

--
David Dorward <http://blog.dorward.me .uk/> <http://dorward.me.uk/>
Home is where the ~/.bashrc is

[ASM]

Re: checkbox to enable / disable hidden fields?

John wrote:[color=blue]
> Sorry, should have been more specific. Yes, what I mean is I want them all
> to not get sent along in the form. So effectively I need them to change
> from:
>
> <input type="hidden" name="SearchAdd _1" value="1">
>
> to
>
> <input type="hidden" name="SearchAdd _1" value="0">
>
> If a checkbox is unchecked, and back to 1 if it is checked.[/color]

<input type=checkbox onclick="Search Add_1.value= this.checked? 1 : 0;">

or to get true / false as value of SearchAdd_1 :

<input type=checkbox onclick="Search Add_1.value= this.checked;">


--
Stephane Moriaux et son [moins] vieux Mac

[David Dorward]

Re: checkbox to enable / disable hidden fields?

ASM wrote:
[color=blue][color=green]
>> <input type="hidden" name="SearchAdd _1" value="0">
>>
>> If a checkbox is unchecked, and back to 1 if it is checked.[/color]
>
> <input type=checkbox onclick="Search Add_1.value= this.checked? 1 : 0;">[/color]

Most browsers don't automatically create, for each element with a name, a
variable with that name as a reference to that element.

onclick="this.f orm.elements['SearchAdd_1'].value ...

I still wouldn't use JavaScript to solve this problem though.

--
David Dorward <http://blog.dorward.me .uk/> <http://dorward.me.uk/>
Home is where the ~/.bashrc is

[ASM]

Re: checkbox to enable / disable hidden fields?

John wrote:[color=blue]
> Sorry, should have been more specific. Yes, what I mean is I want them all
> to not get sent along in the form. So effectively I need them to change
> from:
>
> <input type="hidden" name="SearchAdd _1" value="1">
>
> to
>
> <input type="hidden" name="SearchAdd _1" value="0">
>
> If a checkbox is unchecked, and back to 1 if it is checked.[/color]

function checkSongs(myFo rm,val) {
var f = myForm;
val = val? 1 : 0 ;
for(var i=0;i<f.legnth; i++)
if(f[i].name.indexOf(' SearchAdd')==0) f[i].value = val;
}

Check or uncheck all :
<input type=checkbox onclick="checkS ongs(this.form, this.checked)">

Uncheck all :
<input type=button onclick="checkS ongs(this.form, false)" value=GO>


----------== other way ==--------

<form name="songsForm ".... blah ....>
<p>Pre-selection :
all <input type=radio name="presel" onclick="wichSo ngs()">
some <input type=radio name="presel" onclick="wichSo ngs()">
any <input type=radio name="presel" onclick="wichSo ngs()">
<p class=sg><input type=checkbox name="SearchAdd _1" value="0"> Title 1
<p class=sg><input type=checkbox name="SearchAdd _2" value="0"> Title 2
<p class=sg><input type=checkbox name="SearchAdd _3" value="0"> Title 3
....
<p class=sg><input type=checkbox name="SearchAdd _20" value="0"> Title 20

function whichSongs() {
var f = document.songsF orm;
var r = f.presel;
var j = 0;
for(var i=0;i<r.length; i++) if(r[i].checked) j=i;
var p = f.getElementsBy TagName('P');
for(var i=1;i<p.length; i++) {
if(p[i].className=='sg ') {
p[i].getElementsByT agName('INPUT')[0].checked=false;
p[i].getElementsByT agName('INPUT')[0].value=0;
if(j==2) p[i].style.display= 'none';
else p[i].style.display= '';
if(j==0) {
p[i].getElementsByT agName('INPUT')[0].checked=true;
p[i].getElementsByT agName('INPUT')[0].value=1;
}
}
}
}

--
Stephane Moriaux et son [moins] vieux Mac

[ASM]

Re: checkbox to enable / disable hidden fields?

David Dorward wrote:[color=blue]
> ASM wrote:
>
>[color=green][color=darkred]
>>><input type="hidden" name="SearchAdd _1" value="0">[/color][/color][/color]
[...]
[color=blue]
> I still wouldn't use JavaScript to solve this problem though.[/color]

Yeap, but here we speak about JS
and I understood question was about JS :)

anyway JS is only an help an can't be used to do server's job.

--
Stephane Moriaux et son [moins] vieux Mac

[Richard Cornford]

Re: checkbox to enable / disable hidden fields?

ASM wrote:[color=blue]
> David Dorward wrote:[/color]
<snip>[color=blue][color=green][color=darkred]
>>>><input type="hidden" name="SearchAdd _1" value="0">[/color][/color]
> [...]
>[color=green]
>> I still wouldn't use JavaScript to solve this problem though.[/color]
>
> Yeap, but here we speak about JS
> and I understood question was about JS :)[/color]
<snip>

We may speak about JS here, but one of the things we are allowed to say
is that JS in an inappropriate technology for some tasks. I cannot see
anyone with a good understanding of server-side scripting (and
particularly the handling of form input with it, but that is probably
the first aspect of server-side scripting that anyone would learn) even
considering this. You just observe the state of the checkbox when the
request arrives at the server and act accordingly.

Richard.