Dropdown List : Can Not Save And A Php Warning

Yii 1.1 General Discussion
1

greeting everyone. this is my first time using PHP and Yii.

i just implement a dependant dropdown base on http://www.yiiframework.com/wiki/24/creating-a-dependent-dropdown/#c4447 example.

the code below works fine, except i cannot save ‘category_id’ into database. the category_id return null.

first question : is that happen because i use "echo CHtml::dropDownList" instead of "echo $form->dropDownList"? can anyone guide me how to solve this problem?


// ==========

// _form.php

// ==========


<div class="form">


    <?php 

            $form=$this->beginWidget('bootstrap.widgets.TbActiveForm',array(   

            'id'=>'blog-form',

            'enableAjaxValidation'=>false,

    )); ?>

	

    <p class="help-block">Fields with <span class="required">*</span> are required.</p>


	<?php echo $form->errorSummary($model); ?>	

	

        <?php 

                $topic=new Topic();


               //TOPIC NOT NEED TO BE SAVED TO DATABASE

                echo $form->labelEx($topic,'topic_id');

                echo CHtml::dropDownList('topic_id','',Topic::getTopics(''),

                    array(

                        'prompt'=>'-- select topic --',

                        'ajax' => 

                            array(

                                'type'=>'POST', 

                                'url'=>CController::createUrl('skn/Blog/GetCategoryByTopic'),

                                'update'=>'#category_id', 

                            )

                    )

                );


                echo $form->error($topic,'topic_id');


		//CATEGORY MUST BE SAVED, BUT RETURN NULL VALUE TO DATABASE

                echo $form->labelEx($model,'category');

                echo CHtml::dropDownList('category_id',$model, array(),array('empty' => '-- select topic --'));

                echo $form->error($model,'category_id');                

                

        ?>    


        <div class="form-actions">

                <?php $this->widget('bootstrap.widgets.TbButton', array(

                        'buttonType'=>'submit',

                        'type'=>'primary',

                        'label'=>$model->isNewRecord ? 'Create' : 'Save',

                )); ?>

        </div>


    <?php $this->endWidget(); ?>

</div>	





// ==========

//BlogController.php

// ==========


public function actionGetCategoryByTopic()

{

   $data=Category::model()->findAll('topic_id=:topic_id',

            array(':topic_id'=>(int) $_POST['topic_id']));


   $data=CHtml::listData($data,'category_id','category_name');

   foreach($data as $value=>$name)

   {

        echo CHtml::tag('option',array('value'=>$value),CHtml::encode($name),true);

   }    

}

second question : when i use "echo $form->dropDownList" for dependent dropdown, i get a PHP Warning like below,

but "echo CHtml::dropDownList" works fine. why is that happen ?


get_class() expects parameter 1 to be object, string given 


C:\Apache\htdocs\framework\yii\framework\web\helpers\CHtml.php(2220)


2208             {

2209                 $sub=substr($attribute,0,$pos+1);

2210                 $attribute=substr($attribute,$pos+1);

2211                 return get_class($model).$sub.'['.$attribute.']';

2212             }

2213             if(preg_match('/\](\w+\[.*)$/',$attribute,$matches))

2214             {

2215                 $name=get_class($model).'['.str_replace(']','][',trim(strtr($attribute,array(']['=>']','['=>']')),']')).']';

2216                 $attribute=$matches[1];

2217                 return $name;

2218             }

2219         }

2220         return get_class($model).'['.$attribute.']'; //RED COLOUR HERE

2221     }

ok thats all. thank you. cheers :)

2

Hi rhigel

parameter format is wrong in this case you should have your dorpDownList something as following


<?php


$form->dropDownList($model, 'category_id', array(), array('prompt'=>' -- select topic -- ')); 


// replace this 

CHtml::dropDownList('category_id',$model, array(),array('empty' => '-- select topic --'));

// to 

CHtml::dropDownList($model, 'category_id', array(), array('prompt'=>' -- select topic -- ')); 

?>
3

thanks alir for a quick reply. if i change to this :


echo CHtml::dropDownList($model,'category_id', array(),

array('empty' => '-- select topic --'));

the dropdownlist does not work. the category dropdown always empty after i choose certain data in topic dropdownlist.

4

help yourself

http://www.yiiframework.com/wiki/429/an-easy-solution-for-dependent-dropdownlist-using-ajax/

5

still cannot save the data into $model. i read comments, they have similiar problem.

thank you for your help, if you still have any other clue please mention. ;D