Yii2: How to have sum in footer based on previous pages' sum? - php

Question

Please look the picture below.
As you can see total is 215340 in the summary column. What I want is that in the next page it should start summing those numbers on this number.
Here is a code.
GridView::widget([
'dataProvider' => $dataProvider,
// 'filterModel' => $searchModel,
'columns' => [
[
'class' => 'kartik\grid\SerialColumn'],
// 'id',
[
'attribute' => 'customer_id',
'value' => function ($data) {
return $data->customerDetail->account_no;
}
],
[
'attribute' => 'naration',
'pageSummary' => 'Total',
],
[
'attribute' => 'transaction_type',
'label' => 'Deposits',
'pageSummary' => true,
'pageSummaryOptions' => ['id' => 'total_sum'],
'value' => function ($data) {
if($data->transaction_type==10)
return $data->amount;
else
return 0;
}
],
[
'attribute' => 'transaction_type',
'label' => 'Withdrawals',
'pageSummary' => true,
'value' => function ($data) {
if($data->transaction_type==11)
return $data->amount;
else
return 0;
}
],
[
'class' => 'backend\components\TotalColumn',
'label' => 'Balance',
'attribute' =>'amount',
],
],
// This line displays sum of the columns.
'showPageSummary' => true,
]);
?>
I was thinking about sending this page's sum to the next page using $_GET but the problem is when user going to previous pages i.e. from page 3 to 2. Do you any widget or something for this problem?

Answer 1

My idea is using mysql to select sum of all records in the current column and add this value with the total value of the previous page, I need to know offset and limit of the current page for this query, I can get those values from data provider, to achieve this I have to override the function \yii\grid\Column::renderFooterCellContent().
Extend \yii\grid\DataColumn class
namespace frontend\components;
use yii\helpers\ArrayHelper;
class DataColumn extends \yii\grid\DataColumn
{
protected function renderFooterCellContent()
{
if ($this->footer instanceof \Closure) {
return call_user_func($this->footer, ArrayHelper::getValue($this, 'grid.dataProvider.pagination'));
} else {
return parent::renderFooterCellContent();
}
}
}
Your view file
use frontend\models\Client;
use yii\db\Expression;
use yii\db\Query;
use yii\grid\GridView;
use yii\data\Pagination;
use frontend\components\DataColumn;
echo GridView::widget([
'dataProvider' => $dataProvider,
'dataColumnClass' => DataColumn::className(),
'showFooter' => true,
'columns' => [
//['class' => 'yii\grid\SerialColumn'],
'id',
[
'attribute' => 'num_users',
'footer' => function ($pagination) {
if ($pagination instanceof Pagination) {
$offset = $pagination->offset;
$limit = $pagination->limit;
$cquery = (new Query())
->select(['sub_users' => new Expression('SUM(num_users)')])
->from([
'cpage' => (new Query())
->select('num_users')
->offset($offset)
->limit($limit)
->from(Client::tableName())
]);
//negative offset is illegal
if ($offset > 0) {
$pquery = (new Query())
->select(['sub_users' => new Expression('SUM(num_users)')])
->from([
'ppage' => (new Query())
->select('num_users')
->offset(0)
->limit($offset)
->from(Client::tableName())
]);
$cquery->union($pquery, true);
}
return (new Query())->from(['subt' => $cquery])->sum('sub_users');
}
}
],
]
]);
Raw SQL query
SELECT SUM(sub_sum_users) FROM (
SELECT SUM(num_users) as sub_sum_users FROM (
SELECT num_users FROM `clients` LIMIT 20 OFFSET 120
) cpage
UNION ALL
SELECT SUM(num_users) as sub_sum_users FROM (
SELECT num_users FROM `clients` LIMIT 20 OFFSET 100
) ppage
) sublt
Note:
You could consider to use ActiveRecord, my girdview has a lot of join queries so it's very heavy for me
$offset = $pagination->offset;
$limit = $pagination->limit;
$cquery = Client::find()
->select(['sub_users' => new Expression('SUM(num_users)')])
->from([
'cpage' => Client::find()->select('num_users')->offset($offset)->limit($limit)
]);
//negative offset is illegal
if ($offset > 0) {
$pquery = $cquery = Client::find()
->select(['sub_users' => new Expression('SUM(num_users)')])
->from([
'ppage' => Client::find()->select('num_users')->offset(0)->limit($offset)
]);
$cquery->union($pquery, true);
}
return (new Query())->from(['subt' => $cquery])->sum('sub_users');