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Posted by bill on 04/07/07 10:29
Erwin Moller wrote:
> Jerim79 wrote:
>
>> On Apr 6, 9:08 am, Erwin Moller
>> <since_humans_read_this_I_am_spammed_too_m...@spamyourself.com> wrote:
>>> Jerim79 wrote:
>>>> My situation is that I have a form that asks the user for a number.
>>>> Next, I execute a while loop that displays a group of questions the
>>>> amount of times the customer entered. For instance, the loop looks
>>>> this:
>>>> while ($Number!=0){
>>>> <input type="radio" name="Age[]" value="20-30">20-30
>>>> <input type="radio name="Age[]" value="30-40">30-40
>>>> <input type="radio name"Age[]" value="40-50">40-50
>>>> $Number--;
>>>> }
>>>> Let's say someone entered 3 for $Number. When the loop executes it
>>>> will produce:
>>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>>> The problem is that with radio buttons, you can only choose one
>>>> option. With this code, it only allows the user to choose one option
>>>> from among the 9 listed, instead of one from each set. I am trying to
>>>> find a way to dynamically name each set. If I use checkboxes, then it
>>>> records the information correctly and correctly writes it to the
>>>> database. However, checkboxes don't look good for this application in
>>>> my opinion, and there is no way for me to keep someone from checking
>>>> more than one box, that I know of. Here is the PHP code I am using to
>>>> catch the user's input and write it to a database:
>>>> $Age = $_POST['Age'];
>>>> for ($i=0; $i < $Number; $i++) {
>>>> $query="INSERT INTO table VALUES('$Age[$i])";
>>>> $result = mysql_query($query) or die('Query failed: ' .
>>>> mysql_error());
>>>> }
>>>> Like I say, that works fine if I use checkboxes, without changing the
>>>> HTML name="Age[]". I am looking for a way to define "sets" of radio
>>>> buttons with the same name, so that only one from within a set can be
>>>> chosen at a time. Is there something such as:
>>>> echo "<group name="1">
>>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>>> </group>";
>>>> echo "<group name=\"2\">
>>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>>> </group>";
>>>> echo "<group name=\"3\">
>>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>>> </group>";
>>>> This may be more of a HTML question, but I am open to any solution
>>>> that would help. Any way to use PHP to accomplish my goal? Even if
>>>> there is a way to dynamically name each set such as:
>>>> echo "while ($Number!=0){
>>>> <input type=\"radio\" name=\"Age$Number[]\" value=\"20-30"\>20-30
>>>> <input type=\"radio\" name=\"Age$Number[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age$Number[]\" value=\"40-50\">40-50
>>>> $Number--
>>>> } ";
>>>> I would just have to create a loop to run through each array when
>>>> writing to the database, but that shouldn't be a problem.
>>> Hi,
>>>
>>> You cannot make a group of the radiobuttons since you named them all
>>> Age[] and that IS the group as far as HTML is concerned.
>>> So just code it in such a way they have different names, like this:
>>>
>>> <?php
>>> // receive number
>>> $number = (int)$_POST["number"];
>>> ?>
>>> <input type="hidden" name="numberOfAges" value="<?php echo $number; ?>">
>>> <?php
>>> for ($count=0;$count<$number;$count++){
>>> ?>
>>> <input type="radio" name="Age<?php echo $number; ?>[]"
>>> value="20-30">20-30
>>> <input type="radio name="Age[]<?php echo $number; ?>"
>>> value="30-40">30-40
>>> <input type="radio name"Age[]<?php echo $number; ?>"
>>> value="40-50">40-50
>>> <?php
>>> }
>>> ?>
>>>
>>> Now them radiogroups have names like Age0[] and Age1[]
>>>
>>> And in the receiving script:
>>> $numberOfAges = $_POST["numberOfAges"];
>>> for ($count=0;$count<$numberOfAges;$count++){
>>> $name = "Age".$count;
>>> $theSelectedValue = $_POST[$name];
>>> // Do whatever you want with $theSelectedValue
>>>
>>> }
>>>
>>> Not tested, but I hope you get my drift. :-)
>>>
>>> Regards,
>>> Erwin Moller
>> Thanks, that did the trick. I was just putting my variable before []
>> instead of after. Odd thing is that when I read it into the database,
>> I just use $Age[$i], where I thought I would have to use $Age[$i]
>> $Number. Not sure what is going on under the hood to make $Age[]
>> $Number into just $Age.
>
> Hi Jerim,
>
> It is just the PHP way of passing arrays around from a form to a receiving
> script.
> If PHP receives for example the following 3 name/value pairs (via POST or
> GET), they are automagically turned into an array:
>
> 1) name: Age[] value: 10
> 2) name: Age[] value: 20
> 3) name: Age[] value: 30
>
> If you extract the Age from the posting, like this:
> $passedAge = $_POST["Age"];
> PHP 'sees' that Age[] is posted and extracts all the passed values into an
> array ($passedAge in this case).
> So if a name ends with the [] PHP knows you mean an array.
>
> It is just the PHP way. :-)
>
> Consider this wrong example:
> 1) name: Age value: 10
> 2) name: Age value: 20
> 3) name: Age value: 30
>
> If you try to extract it now like this:
> $passedAge = $_POST["Age"];
>
> You'll end up with only the last value (30) and not an array.
>
> So what went wrong in your first try was simply that you didn't end with the
> [].
>
> Hope that clearifies it a bit.
>
> Good luck & happy coding!
>
> Regards,
> Erwin Moller
Just for clarification:
ending a passed variable with a [] tells PHP it is an array.
This is NOT a html construct, html doesn't care.
Right ?
bill
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