PHP Forum

**jameswhite** · 06-17-2009, 02:05 PM

Hi,

I want to take the value selected from a drop down menu I have and then add the value too somewhere else on the page. The reason for this is so eventually I can hide this value and add it into a URL ( it's a long story..).

So anyway this is my code so far:

Code:

<form id="countries_select" name="countries_select" method="post" action="$_SERVER['PHP_SELF']">
  <select name="countries" id="countries" onchange="">
    <option value="US">United States</option>
    <option value="GB" selected="selected">United Kingdom</option>
    <option value="ES">Spain</option>
  </select>
  <label>
    country_selected:
    <?php $country = $_POST[''];
    echo  $country;?>
    
     
  </label>
</form>

So basically I just need to know how to get the value from the drop down into the variable "$country"

Thanks

**anderswc** · 06-17-2009, 02:07 PM

$_POST['countries']

**jameswhite** · 06-17-2009, 02:12 PM

Funnily enough I had already tried that..

It returns this error Notice: Undefined index: countries in "replaced my website location on server" on line 38

So I just assumed it wasn't the right way to do it

**NullPointer** · 06-17-2009, 02:32 PM

That's not an error, its a notice. By default error reporting is set to E_ALL & ~E_NOTICE meaning that notices are not reported. What the notice means is that there is no index countries in POST.

**jameswhite** · 06-17-2009, 02:41 PM

^ Oh right, any ideas on what I can do then ?

**Decaf** · 06-17-2009, 02:47 PM

You need to send a value with $_POST['countries'].

**jameswhite** · 06-17-2009, 03:26 PM

Ok I've got it so that it sends the value to a php page called "countries.php" but with the use of a submit button.

I was hoping to get the value to sort of update itself when the country selected from the drop down was changed. And do all this whilst staying on the same page.

Thanks for all the help so far

Updated Code:

HTML Code:

<form id="countries_select" name="countries_select" method="post" action="countries.php">
  <select name="countries" id="countries" onchange="">
    <option value="US">United States</option>
    <option value="GB" selected="selected">United Kingdom</option>
    <option value="ES">Spain</option>
  </select>
  <label>
    <input type="submit" name="button" id="button" value="Submit" />
  </label>
  <label>
    country_selected: <!--This is where I am hoping the country selected will be displayed-->
</label></form>

countries.php

PHP Code:


			
<?php

$country = $_POST['countries'];



echo "Country Selected: ". $country . "<br />";



?>

**maxxximus** · 06-17-2009, 04:19 PM

Just use a conditional isset to avoid the notice.

PHP Code:


			
<form id="countries_select" name="countries_select" method="post" action="<?php echo $_SERVER['PHP_SELF']?>">
  <select name="countries" id="countries" onchange="">
    <option value="US">United States</option>
    <option value="GB" selected="selected">United Kingdom</option>
    <option value="ES">Spain</option>
  </select>
  <label>
    <input type="submit" name="button" id="button" value="Submit" />
  </label>
  <label>
    <?php if (isset($_POST['countries'])){
    $country = $_POST['countries'];

echo "Country Selected: ". $country . "<br />";

}?>
</label></form>

**jameswhite** · 06-17-2009, 05:37 PM

That works perfectly thanks, one last request.

Is it possible to make it so that the form basically submits itself automatically without the button everytime an option is changed ?

Thanks

**NullPointer** · 06-17-2009, 06:57 PM

You can do that with javascript. Just set an onclick event for each option to submit the form.

Off the top of my head here is one way to do this:

Code:

function submitForm()
{
     document.countries_select.submit();
}

Code:

onclick="submitForm();"

Using Ajax you might be able to come up with something cleaner or more dynamic.

**jameswhite** · 06-17-2009, 07:32 PM

Not Sure if i've done this right or not, because it still doesn't seem to be automatically doing it. Only works once the submit button has been pressed ( which I have now deleted )

HTML Code:

  <form id="countries_select" name="countries_select" method="post" action="<?php echo $_SERVER['PHP_SELF']?>">
  [php]<?php function submitForm()
{
     document.countries_select.submit();
}?>[/php]
  <select name="countries" id="countries" onchange="submitForm();">
    <option onclick="submitForm();" value="US" input type="submit">United States</option>
    <option onclick="submitForm();"value="GB" >United Kingdom</option>
    <option onclick="submitForm();"value="ES">Spain</option>
  </select>
  <label>
    [php]<?php if (isset($_POST['countries'])){
    $country = $_POST['countries'];

echo "Country Selected: ".$country. "<br />";

}?>[/php]

**NullPointer** · 06-17-2009, 09:38 PM

The code I posted is javascript not PHP.

Code:

  <form id="countries_select" name="countries_select" method="post" action="<?php echo $_SERVER['PHP_SELF']?>">
<script type="text/javascript">
function submitForm()
{
     document.countries_select.submit();
}
</script>
  <select name="countries" id="countries" onchange="submitForm();">
    <option onclick="submitForm();" value="US" input type="submit">United States</option>
    <option onclick="submitForm();"value="GB" >United Kingdom</option>
    <option onclick="submitForm();"value="ES">Spain</option>
  </select>
  <label>
    <?php if (isset($_POST['countries'])){
    $country = $_POST['countries'];

echo "Country Selected: ".$country. "<br />";

}?>

**jameswhite** · 06-18-2009, 09:20 AM

^ oops yh sorry It was pretty late at night when I read your post

One last thing now I've got more $country variable working I want to insert it into a custom URL I'm generating but everytime I put it in it says 'Undefined Variable' again.

I want to place the country that is selected after the 'country=' part of the URL

HTML Code:

<?php
table_add('Fall Into Place','Apartment');
table_add('Kids','MGMT');
table_add('Closer','Travis');

function table_add($title,$artist) {
$term = str_replace(' ','+',$title.' '.$artist);
$link = '<a href="http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStoreServices.woa/wa/wsSearch?term='.$term.'&limit=1&entity=musicTrack&country='.$country.'">Download</a>';
echo '<tr><td>'.$title.'</td><td>'.$artist.'</td><td>'.$link.'</td></tr>';};

?>

</tbody>
</table> 
&nbsp;</th>
  </tr>
<form id="countries_select" name="countries_select" method="post" action="<?php echo $_SERVER['PHP_SELF']?>">
    <form id="countries_select" name="countries_select" method="post" action="<?php echo $_SERVER['PHP_SELF']?>">
<script type="text/javascript">
function submitForm()
{
     document.countries_select.submit();
}
</script>
<select name="countries" id="countries" onchange="submitForm();">
    <option value="US" selected="selected">Select Country</option>
    <option onchange="submitForm();" value="US" input type="submit">United States</option>
    <option onchange="submitForm();" value="GB">United Kingdom</option>
    <option onchange="submitForm();" value="ES">Spain</option>
    <option onchange="submitForm();" value="DE">Germany</option>
    <option onchange="submitForm();" value="NL">Netherlands</option>
    <option onchange="submitForm();" value="FR">France</option>
    <option onchange="submitForm();" value="IT">Italy</option>
    <option onchange="submitForm();" value="PL">Poland</option>
    <option onchange="submitForm();" value="MX">Mexico</option>
    <option onchange="submitForm();" value="PT">Portugal</option>
    <option onchange="submitForm();" value="BR">Brazil</option>
  </select>
  
<label>

<?php
    $country = false;
    if (isset($_POST['countries'])){
    $country = $_POST['countries'];
echo 'Country Selected: '.$country. '<br />';

}?>

Thanks you've all been really helpful

**NullPointer** · 06-18-2009, 12:14 PM

Your variables must be defined before you call them. You call $country near the beginning of your function, but you don't define it until the end.

**maxxximus** · 06-18-2009, 02:32 PM

Quote:

Originally Posted by NullPointer

Your variables must be defined before you call them. You call $country near the beginning of your function, but you don't define it until the end.

Shirly

its because the OP is trying to use a variable that's in the global scope, within a function(local scope). Import it into local scope with $GLOBALS['country']

PHP Code:


			
$link = '<a href="http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStoreServices.woa/wa/wsSearch?term='.$term.'&limit=1&entity=musicTrack&country='.$GLOBALS['country'].'">Download</a>';

**jameswhite** · 06-18-2009, 03:50 PM

^ I understand what your saying but it still quotes Notice: Undefined Index ? And the link isn't updated with the country variable.

Current Code:

PHP Code:


			
<?php

table_add('Fall Into Place','Apartment');

table_add('Kids','MGMT');

table_add('Closer','Travis');



function table_add($title,$artist) {

$term = str_replace(' ','+',$title.' '.$artist);

$link = '<a href="http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStoreServices.woa/wa/wsSearch?term='.$term.'&limit=1&entity=musicTrack&country='.$GLOBALS['country'].'">Download</a>';

echo '<tr><td>'.$title.'</td><td>'.$artist.'</td><td>'.$link.'</td></tr>';};



?>



<form id="countries_select" name="countries_select" method="post" action="<?php echo $_SERVER['PHP_SELF']?>">

    <form id="countries_select" name="countries_select" method="post" action="<?php echo $_SERVER['PHP_SELF']?>">

<script type="text/javascript">

function submitForm()

{

     document.countries_select.submit();

}

</script>

<select name="countries" id="countries" onchange="submitForm();">

    <option value="US" selected="selected">Select Country</option>

    <option onchange="submitForm();" value="US" input type="submit">United States</option>

    <option onchange="submitForm();" value="GB">United Kingdom</option>

    <option onchange="submitForm();" value="ES">Spain</option>

    <option onchange="submitForm();" value="DE">Germany</option>

    <option onchange="submitForm();" value="NL">Netherlands</option>

    <option onchange="submitForm();" value="FR">France</option>

    <option onchange="submitForm();" value="IT">Italy</option>

    <option onchange="submitForm();" value="PL">Poland</option>

    <option onchange="submitForm();" value="MX">Mexico</option>

    <option onchange="submitForm();" value="PT">Portugal</option>

    <option onchange="submitForm();" value="BR">Brazil</option>

</select>

  

<label>

<?php

    $country = false;

if (isset($_POST['countries'])){

    $country = $_POST['countries'];    

echo 'Country Selected: '.$country. '<br />';



}?>

Thanks again

**NullPointer** · 04:43 PM

There is no global variable country, there is however a global countries (more specifically a variable in POST).

Try:

PHP Code:


			
<?php 

table_add('Fall Into Place','Apartment'); 

table_add('Kids','MGMT'); 

table_add('Closer','Travis'); 



function table_add($title,$artist) { 

$term = str_replace(' ','+',$title.' '.$artist); 

$link = '<a href="http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStoreServices.woa/wa/wsSearch?term='.$term.'&limit=1&entity=musicTrack&country='.$_POST['countries'].'">Download</a>'; 

echo '<tr><td>'.$title.'</td><td>'.$artist.'</td><td>'.$link.'</td></tr>';}; 



?> 



<form id="countries_select" name="countries_select" method="post" action="<?php echo $_SERVER['PHP_SELF']?>"> 

    <form id="countries_select" name="countries_select" method="post" action="<?php echo $_SERVER['PHP_SELF']?>"> 

<script type="text/javascript"> 

function submitForm() 

{ 

     document.countries_select.submit(); 

} 

</script> 

<select name="countries" id="countries" onchange="submitForm();"> 

    <option value="US" selected="selected">Select Country</option> 

    <option onchange="submitForm();" value="US" input type="submit">United States</option> 

    <option onchange="submitForm();" value="GB">United Kingdom</option> 

    <option onchange="submitForm();" value="ES">Spain</option> 

    <option onchange="submitForm();" value="DE">Germany</option> 

    <option onchange="submitForm();" value="NL">Netherlands</option> 

    <option onchange="submitForm();" value="FR">France</option> 

    <option onchange="submitForm();" value="IT">Italy</option> 

    <option onchange="submitForm();" value="PL">Poland</option> 

    <option onchange="submitForm();" value="MX">Mexico</option> 

    <option onchange="submitForm();" value="PT">Portugal</option> 

    <option onchange="submitForm();" value="BR">Brazil</option> 

</select> 

   

<label> 

<?php 

    $country = false; 

if (isset($_POST['countries'])){ 

    $country = $_POST['countries'];     

echo 'Country Selected: '.$country. '<br />'; 



}?>

Just to reiterate, your error reporting is not set to the default. Notices can be useful, but your script can function even if notices occur.