Hiding HTML when data provider returns empty

Yii 1.1 General Discussion
1

Hello there

I have been using Yii for a few weeks now and I am loving it!

I have a view file that contains the following:




<?php $deleteSelected= BootHtml::submitButton('Delete selected',array('class'=>'btn primary small'));?>

<?php $this->widget('zii.widgets.grid.CGridView',array(

	'id'=>'user-grid',

	'dataProvider'=>$model->search(),

	'filter'=>$model,

	'ajaxUpdate' =>false,

	'selectableRows'=>'2',

	'template'=>"{summary}\n{items}\n$deleteSelected\n{pager}", //Used to instert button above pager

	'columns'=>array(

      array(

                    'class' => 'CCheckBoxColumn',

                ),


		'id',

		array(

		'name'=>'username'),


		array(

			'name'=>'role',

			'filter'=>$model->fetchRoles(),

			'sortable'=>false,

		),

		'email',

		array(

			'class'=>'CBootButtonColumn',

		),

	),


));?>

Because I want to display my submit button ($deleteSelected) above the pager I am having to output it in the template string. However, when the data provider returns no results the button is still printed.

My question is how do I access a method of the data provider object within the widget construction above.

I only want to output the $deleteSelected var if that data provider returns some data.

Many thanks…

2

Try this




'template'=>"{summary}\n{items}".$model->pagination->itemCount?"\n$deleteSelected":""."\n{pager}",

(not tested)

/Tommy

3

Thank you, but $model->pagination->itemCount is not a property of the model. But you have put me on the right track. I need to work out how to access the methods and properties of the grid widget and its parents inside the widget construct. I know $this gets me the controller class but this is no good to me either.

I will keep looking…

4

My mistake. $model->search() will return the CActiveDataProvider instance. You should be able to assign the value to a local variable in the statement used for assigning to the dataprovider property. Since I’m not sure about how param evaluation order is defined in the language, just assign $model->search() to a local variable before the widget creation. Then use the local variable (e.g. $dp) instead of $model->search().

Additional edit:

$dp->itemCount it is. Not $dp->pagination->itemCount

/Tommy

5

OK. If I access the itemCount property of CAtiveDataProvider (before it is returned to the widget) and make it a property of the model then I can use it in the widget.

My model:




class User extends CActiveRecord

{

	public $itemCount;


...


	public function search()

	{

		$criteria=new CDbCriteria;

		$criteria->compare('id',$this->id);

		$criteria->compare('username',$this->username,true);

		$criteria->compare('role',$this->role,true);

		$criteria->compare('email',$this->email,true);


		$dataProvider= new CActiveDataProvider($this, array(

			'criteria'=>$criteria,

		));

		//Pass CActiveDataProvider::itemCount to this model

		$this->itemCount=$dataProvider->itemCount;

		

		return $dataProvider;

	}

In my view:




<?php $deleteSelected= BootHtml::submitButton('Delete selected',array('class'=>'btn primary small'));?>

....

	'template'=>"{summary}\n{items}".($model->itemCount ? $deleteSelected : "") ."\n{pager}", //Use to instert code above pager etc...

...

Is there a better/cleaner way of doing this?

6

I posted #5 before seeing your #4 post. I think it is along the same lines.

Many thanks for your time and help.