(urgent) okay strange problem with checkboxes, javascript and PHP..

Danny2055

hi
im having a problem with one of the scripts in the game im writing,
basically, the PHP script controls upgrading the systems on your ship, the script generates table rows containing tech that can be upgraded, along with a textbox containing the price to upgrade and a chekbox. if you click on this checkbox, it totals up all the costs (where the checkbox is checked) and adds it to the total cost box at the bottom,
now, i got that working by calling all the checkboxes the same thing javascript makes them into an array, you can then cycle through them using checkboxname and total the ones up that are checked
unfortunatly, doing that means that only the last checkbox is passed back to PHP (therefore i dont know which tech the user wants to upgrade),
does anyone see a way around this?
thanks in advance for any help
(note: html can be viewed (along with the javascript at the top)here)

barand

If the checkboxes in your form are called "checkboxname[]" then when you process the form. $_POST['checkboxname'] will be an array of all the checked values.

hth

Danny2055

Originally posted by barand
If the checkboxes in your form are called "checkboxname[]" then when you process the form. $_POST['checkboxname'] will be an array of all the checked values.

hth

theyre just called tech (without the trailing []'s), that way javascript puts them in the array, it doesnt work when i name them tech[] or tech[1].. tech[2]... etc.

laserlight

Well, since you're coding with the assumption that javascript support is turned on, you might as well use JS to write to a hidden input that contains what you need, then ignore the indoividual results, only passing the hidden field's value to PHP.

On the other hand, if you do indeed need the individual results but cant find a way of getting name="tech[]" to work with JS, then discard the JS and sum using PHP.
If the total cost exceeds the money the player has on hand, dont proceed with the update and inform the player.

Whether or not you are using JS to sum, you should have such a check anyway, so it doesnt really matter.

laserlight

actually, come to think of it, there is a crude solution to your problem:
Each tech item has 1 checkbox and 1 hidden field.
The checkbox is named "checktech", while the hidden field "tech[]"
Then, whenever a checkbox is ticked, the sum of checktech can be found, while the corresponding tech[] field is set to a value.
Then, PHP access $_POST['tech'] array while JS can still sum checktech with only minor modifications.

There probably is a more elegant way of doing this, perhaps by accessing tech[] via JS, but my JS isnt very good so I cant volunteer a solution.

Weedpacket

It's perfectly possible to have the checkboxes named with [] and still have them accessible to Javascript. I forget exactly how right now, but example code is in the FAQ.

barand

In JS, if you address the checkboxes as

formname.tech[]

it will fail.

Instead use

formname.elements['tech[]']

and it should work.

hth

julioc

Look at this code

This is the PHP code
The name of the form is "create"
if ($wtype[0] == 1)
{
echo '<td>';
echo '<table border="0" width="100%" bordercolor="#000000">'; // table for agents/devices
for ($i=0; $i<2; $i++)
{
echo '<tr><td align=center>';
echo '<input name=agent[] size = 3> </td> <td align=center>';
echo '<input name=dev[] size=2> </td><td align=center>';
echo '<input name=serv[] size = 7 value ='; echo strtoupper(@$wserv) .'></td>';
}
echo '</table></td></tr>'; // End table for agents/devices
}

End of php code

This is the javascript code

for (var i = 0 ; i< document.create.elements.length; i++)
{
if (document.create.elements.name == "serv[]")
{
k += 1;
var witem = document.create.elements.value;
if ( witem.length == 3)
{
wservs += 1;
}
else
{
wserv2 += _witem + ":";
}
}
}

Hope it helps you....