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Posted by bill on 04/08/07 14:42
Erwin Moller wrote:
> 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
>
Thanks, good to know.
bill
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