Difference between #2 and #1 of Using the jamselect widget with min and max values

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Title
Using the jamselect widget with min and max values
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Category
How-tos
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Tags
Form validation, Widgets
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Content
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[jamselect](http://www.yiiframework.com/extension/jamselect/
"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.

~~~
[php]
<?php	

$this->widget(
    'application.extensions.asmselect.JAMSelect',
    array(
        'selected'=>$this->getKeywords($model->keywords),
		'data'=>CHtml::listData(Keywords::model()->findAll(),'word', 'word'),
                'htmlOptions'=>array(
            'title'=>'Select up to six keywords',
            'name'=>'keywordArray'
        ),
        'animate'=>true
    ));

?>
~~~
#### 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
'word'=>'word'.

 The $_POST data will contain an array of selected values, this will be in
$_POST['keywordArray']

#### Lets look at the controller (create)


~~~
[php]
	public function actionCreate()
	{
		$model=new EventAbstract;
		
		$this->layout = '//layouts/column1';

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

		if(isset($_POST['EventAbstract']))
		{
			$model->attributes=$_POST['EventAbstract'];

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

    // 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
    $this->setKeywords($model,'keywords',$keywordArray);

    // it's all done but not yet validated
			if($model->save())
				$this->redirect(array('view','id'=>$model->id));
		}

		$this->render('create',array(
			'model'=>$model,
		));
	}

~~~
#### 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.


~~~
[php]
	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.

~~~
[php]

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

#### Rules
And now for the rules (in the model file)


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

// other rules

);
	
	}

~~~

#### The validation function


~~~
[php]
public function keywordCount($attribute,$params)
{
	 $keys = explode(',',$this->$attribute);
// check if there are keywords exist
	if(!$this->$attribute)
	{
	    $this->addError($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 =
'.$params['maxKeys']);
	}	 
}
	
~~~

Now the user can select between 2 and 6 keywords.

doodle