Unable to post multiple selection custom listbox values from register form

Question

I have created a multiple selection list in registeration form so on the registeration.xml i have pasted this code

<field name="groupMember"
            type="list"
            description="choose cybertechnos groups"
            filter="username"
            label="Choose Groups"
            multiple ="true"
            >

 <option value ="A">A</option>
                <option value ="B">B</option>
                <option value ="C">C</option>
     </field> 

I have also defined its variable in the JUser user.php file like below

    public $groupMember = null;

Now user is able to register fine but the saved value displays only single text "Array" seems like there is nothing except Array coming from the form.

I have var_dump the value on register function of com_users\models\registeration.php

the values display like this

["groupMember"]=> string(5) "Array"

array(8) { ["groupMember"]=> string(5) "Array" ["name"]=> string(4) "abcd" ["username"]=> string(4) "abcd"..............etc

seems like i am not getting any real array object.

I am very new in joomla , Kindly help

Answer 1

You're getting Array because there are multiple, potential values as you're using the multiple="" attribute.

If you use var_dump($groupMember);, you'll see the values inside the array.

To display the value, you will need to use a foreach loop, like so:

foreach ($groupMember as $group)
{
    echo $group . '<br>';
}

Answer 2

I have found it my self , Just need to convert array into string inside the controller class of registration e.g. components/com_users/controllers/registeration.php

inside the function called "register"

 if ( is_array( $requestData['groupMember'] )) {
            $requestData['groupMember'] = implode( ',', $requestData['groupMember'] );
        }