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Posted by Jerry Stuckle on 11/13/06 01:47
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.
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
==================
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