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Posted by Jerry Stuckle on 11/13/06 12:47
Amer Neely wrote:
> Jerry Stuckle wrote:
>
>> Amer Neely wrote:
>>
>>> Jerry Stuckle wrote:
>>>
>>>> Amer Neely wrote:
>>>>
>>>>> Jerry Stuckle wrote:
>>>>>
>>>>>> Amer Neely wrote:
>>>>>>
>>>>>>> flamer die.spam@hotmail.com wrote:
>>>>>>>
>>>>>>>> Amer Neely wrote:
>>>>>>>>
>>>>>>>>> I've got a dynamically built form with checkboxes for each
>>>>>>>>> element ( a
>>>>>>>>> list of file names in a directory). I need to grab only those
>>>>>>>>> checkboxes
>>>>>>>>> that are checked, so I can then delete those files.
>>>>>>>>>
>>>>>>>>> Does each checkbox name have to be unique? I was hoping to just
>>>>>>>>> group
>>>>>>>>> them under one name, and select from that array.
>>>>>>>>>
>>>>>>>>> PHP is not my native language - I'm coming at this from Perl,
>>>>>>>>> so bear
>>>>>>>>> with me, things are a little different in that country.
>>>>>>>>>
>>>>>>>>> I've tried:
>>>>>>>>> foreach ($_REQUEST as $field => $value)
>>>>>>>>> {
>>>>>>>>> echo "$field = $value<br>";
>>>>>>>>> }
>>>>>>>>> but that just grabs the last entry in the group.
>>>>>>>>>
>>>>>>>>> The line in question is:
>>>>>>>>> <input type="checkbox" name="DeleteThis" value="<?php
>>>>>>>>> echo("$allfiles[$i]")?>"> <?php echo("$allfiles[$i]")?><br>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> in html, if your checkbox is called "blah123" then when its
>>>>>>>> checked it
>>>>>>>> will have the variable name of blah123 with a value of blah123,
>>>>>>>> if it
>>>>>>>> is unchecked then blah123==null. the easy way is:
>>>>>>>>
>>>>>>>> if (!empty($_POST['blah123'])) { do stuff }
>>>>>>>>
>>>>>>>> Flamer.
>>>>>>>>
>>>>>>>
>>>>>>> Hmmm. OK, so I will need to also walk through each of the new
>>>>>>> input names, and check them with the 'empty' function. I'll work
>>>>>>> on that. Thanks.
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> Amer,
>>>>>>
>>>>>> No. It's much easier than that. Have all the checkboxes names
>>>>>> the same, with square brackets ( "[]" ) following. The you will
>>>>>> be able to use an array on the PHP side, i.e.
>>>>>>
>>>>>>
>>>>>> <input type="checkbox" name="DeleteThis[]" value="<?php
>>>>>> echo("$allfiles[$i]")?>"> <?php echo("$allfiles[$i]")?><br>>
>>>>>>
>>>>>>
>>>>>> To process the input, all you need is:
>>>>>>
>>>>>> foreach ($_POST['DeleteThis'] as $delfile) {
>>>>>> // Validate the filename is OK here
>>>>>> unlink $delfile;
>>>>>> }
>>>>>>
>>>>>> This will work whether the checkbox is set via a mouse click or
>>>>>> javascript.
>>>>>>
>>>>>> Of course, you will want to validate your filenames. That part I
>>>>>> left out because I have no idea what the criteria is.
>>>>>>
>>>>>
>>>>> OK, I have your code inserted, but it gives me an error when I use
>>>>> my 'Select All' JS:
>>>>>
>>>>> Warning: Invalid argument supplied for foreach() in show_spam4.php
>>>>> on line 116
>>>>>
>>>>> If I click any box with the mouse it returns 'on' for the output.
>>>>>
>>>>> [116] foreach ($_POST['DeleteThis'] as $value)
>>>>> {
>>>>> echo "$value<br>";
>>>>> }
>>>>>
>>>>
>>>> Amer,
>>>>
>>>> I didn't mean for that to be the only code. Rather it was a guide
>>>> to get you going in the right direction.
>>>>
>>>> The invalid argument is probably because none of the checkboxes are
>>>> checked, so you're not getting anything in your PHP code. To make
>>>> sure you're getting good information, check out isset() and
>>>> isarray() functions.
>>>>
>>>
>>> :) Sorry, I'm new with PHP so everything is literal. But as I
>>> mentioned, if I check all the boxes with JS, and submit the form, it
>>> throws that error. I'm going to do some reading and see what I can
>>> come up with. Thanks for the input and direction so far.
>>>
>>
>> I would suggest your javascript isn't doing it's job. When I check
>> boxes with js the do appear in PHP.
>>
>
> That isn't the problem - they appear just fine in the page. I can toggle
> them off and on all night.
>
> It's only when the page is submitted that the values don't seem to be
> getting through.
>
Then you need to check your javascript code. It doesn't make any
difference to PHP whether the checkbox is checked by the user or JS - in
fact, there is no way for PHP to tell.
If the box is checked, the client sends it to the server when the form
is submitted. If the box is not checked, the client does not submit it
to the server. There is no "checked by user" or "checked by javascript"
flag. It's either checked or not checked.
And the fact it isn't going to the browser indicates it's not checked,
or you've done something else with your javascript.
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
==================
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