Sometime its very important to perform many actions/operation with limited time frame for friendly use, select2 provides a lot of such functionality , I just extend it tags functionality to provide a quick use for developer to save time, as I spent much time on it.

I this tutorial we will add , delete , list all all and probably update tags. I my case ,I have three tables Feedback, Tag, Feedbacktags. For feedbacktags and tags are important .

Feedback(id,……..)
Feedbacktags(id, feedback_id, tag_id),
Tag(id, name,….)

• Load all tags to text field

echo CHtml::textField('Tags','',array('id'=>'tags','class'=>'span5','cols'=>'45','rows'=>'3'));
                        $this->widget('ext.select2.ESelect2',array(
                          'selector'=>'#tags',
                          'options'=>array(
                            'tags'=>  Feedback::getTags(), // you tags list 
                          ),
                            'htmlOptions' => array(
                           'multiple' => 'multiple',
                            ),
                        ));

• Define method in Feedback model to have a tags assigned to it (if so)

public function getAssignedTagsIDs($id)
{
    // for deleting in tag section
     $models= FeedbackTags::model()->findAll('feedback_id='.$id);
 
     $result = array();
     foreach ($models AS $employee) {
         $result[] = $employee->tag_id;
     }
     return $result;
}

• In your controller where your adding tags like in update

// check if Tags extis
            if (isset($_POST['Tags'])) {
                
                            $tagsList = explode(',', $_POST['Tags']);  // get the array of tags 
                            $currentTagsList = array();  // track to have currently selected tags used for deleted 
                            foreach ($tagsList as $TagValue) {
                                // check if exist in tag table or not
                                $isExists = Tags::model()->find('name=:name', array(':name' => $TagValue)); 
                                if (count($isExists) > 0) {  
                                    // if exists just assign
                                    $tag = new FeedbackTags;
                                    $tag->feedback_id = $feedback_id;
                                    $tag->tag_id = $isExists->id;
                                    $tag->save();
                                    $currentTagsList[]=$tag->tag_id;  // add to array  for track
                                } else {   // if not exist add to tag table and then to tags
                                    $tagNew = new Tags;
                                    $tagNew->name = $TagValue;
                                    if ($tagNew->save()) {
                                        //  now add to feedbacktags table
                                        $tag2 = new FeedbackTags;
                                        $tag2->feedback_id = $feedback_id;
                                        $tag2->tag_id = $tagNew->id;
                                        $tag2->save();
                                        $currentTagsList[]=$tag->tag_id; // add to array  for track
                                    }
                                }
                            }
                        
                        }
                        $previousTagsList = Feedback::getAssignedTagsIDs($feedbackModel->id); // get all exist in feedbackTags table
                        $deletedList=array_diff($previousTagsList, $currentTagsList); // difference
                        if(count($deletedList)){
                            foreach ($deletedList as $item){
                                // just delete form feedbackTags table NOT from Tags , if you want you can delete
                                FeedbackTags::model()->find('tag_id='.$item .' AND feedback_id='.$feedbackModel->id)->delete();
                                
                            }
                        }