Difference between #5 and #4 of Using the jamselect widget with min and max values

Using the jamselect widget with min and max values
Form validation, Widgets
The problem
I needed to have users select from a list of keywords, in this example they must
select at least two keywords but they cannot select more than six.

The keywords will be stored in a text field in a comma delimited format.  The
keywords will be created by the site administrator.

In a very timely fashion the
"jamselect") widget showed up, thanks volkmar!

The widget does not provide min/max filtering so I will implement a custom rule.

First put the widget in a form
This is my implementation.

		'data'=>CHtml::listData(Keywords::model()->findAll(),'word', 'word'),
            'title'=>'Select up to six keywords',

A few things to notice
The widget is located in `/protected/extensions not
/protected/extensions/widgets`, I only point this out for people who aren't sure
where to put things.  You have quite a bit of flexibility on where you locate
widgets and components. It doesn't makes sense to me to create another folder in
extensions but perhaps on a very large project it would.

The dropdown list data is being pulled from a table that has only two fields,
`id` and `word`, since I want to select the word from the list and store exactly
the same value in the database I need a key=>value array that looks like

The `$_POST` data will contain an array of selected values, this will be in

Lets look at the controller (create)
public function actionCreate()
    $model=new EventAbstract;

    $this->layout = '//layouts/column1';

    // Uncomment the following line if AJAX validation is needed
    // $this->performAjaxValidation($model);


        // I better do a check in case no keywords were selected
        $keywordArray = (!isset($_POST['keywordArray']) ? array() :

        // now I either have an array of keywords or an empty array
        // send the array to a function to format the keywords in a 
        // comma delimited format

        // it's all done but not yet validated


Here is the function that formats the keywords
Remember the keywords are suppled by the admin so I am not doing any checking
here for capitals or illegal characters.

public function setKeywords($model,$field,$keys)
    $model->$field = (empty($keys) ? null : implode(',',$keys));

Update record
And when we perform an update on the record we have to turn our comma delimited
field back into an array, so similarly.

public function getKeywords($delimited)
    $keys = explode(',',$delimited);
    return $keys;

And now for the rules (in the model file)

public function rules()
    // NOTE: you should only define rules for those attributes that
    // will receive user inputs.
    return array(
        // other rules are here
'keywordCount', 'skipOnError'=>true, 'maxKeys'=>6, 'minKeys'=>2),
        // keywords is the field in the table currently holding the submitted
        // $model->keywords
        // keywordCount is the function (in the model) that will do the
        //skipOnError, maxKeys and minKeys are all parameters that will be 
        //sent to the validation function other rules

The validation function
public function keywordCount($attribute,$params)
    $keys = explode(',',$this->$attribute);
    // check if there are keywords exist
        $this->addError($attribute,'<strong>If you need to add a
keyword please contact the administrator</strong>');
    // check if there are enough keywords
    if(count($keys) < $params['minKeys'])
        $this->addError($attribute,'Please choose at least
'.$params['minKeys'].($params['minKeys'] > 1 ? ' keywords' :' keyword'));
    // check if there are too many keywords
    if(count($keys) > $params['maxKeys'])
        $this->addError($attribute,'You have chosen too many keywords max =
Now the user can select between 2 and 6 keywords.