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Posted by Erwin Moller on 04/07/07 11:17
bill wrote:
> 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 ?
Right.
HTML just sends all the form's name/value pairs to whatever is defined as
'action' in the form.
Regards,
Erwin Moller
>
> bill
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