Pagination in the Yii framework: Optimizing data display

In Web applications, data display is an important and frequently used function. When faced with large amounts of data, it is particularly important to display and obtain the required data. Paging plays a decisive role in realizing the data display function.

Yii framework is an excellent web application framework. It provides powerful and easy-to-use paging functions, which can help us optimize the effect of data display. So, how to use the paging function in the Yii framework? This article will introduce in detail how to use the paging function in the Yii framework to optimize data display.

1. Set paging in the controller

In the Yii framework, we usually implement data query and paging control in the controller. First, you need to query the data in the controller's action and use the pager to page the data.

// 控制器的action中查询数据
public function actionIndex()
{
    $query = News::find();
    
    // 使用yiidataPagination类实现分页功能
    $pagination = new yiidataPagination([
        'totalCount' => $query->count(),
        'pageSize' => 10
    ]);
    
    // 调用query的offset和limit方法对数据进行分页
    $models = $query->offset($pagination->offset)
        ->limit($pagination->limit)
        ->all();
        
    //将查询结果传递给视图
    return $this->render('index', [
        'models' => $models,
        'pagination' => $pagination
    ]);
}

In the above code, we first query the data, and then use the yiidataPagination class in Yii to implement paging control. Among them, the totalCount attribute indicates the total number of data, and the pageSize attribute indicates the number of entries displayed on each page. Next, we call the offset and limit methods of query $query to implement paging. The offset and limit here correspond to LIMIT and OFFSET in the SQL statement. Finally, the query results are passed to the view for display.

2. Use paging in the view

In the view, we need to display the data of each page and provide operations to control paging, which requires us to use a paginator in the view .

<?php
// 在视图中显示数据
foreach($models as $model) {
    // 显示每个数据项
}

// 使用yiiwidgetsLinkPager类实现分页器
echo yiiwidgetsLinkPager::widget([
    'pagination' => $pagination
]);
?>

In the above code, we first use a foreach loop to traverse the data of each page and display the data into the view. Then, use the yiiwidgetsLinkPager class in Yii to implement the paginator, where the pagination attribute corresponds to the paging control object. The paginator will automatically display page numbers and related operations, such as jumping to a specified page.

3. Optimize the paging effect

In the process of using the paging device, we can also perform some more practical optimizations. For example, you can adjust the number of displayed links and add front and back page turning operations, or when using Ajax technology, we can use refresh-free paging to avoid repeated loading.

//在Pagination中设置页面链接数量
$pagination->maxButtonCount = 5;
//在LinkPager中设置前后翻页按钮
echo yiiwidgetsLinkPager::widget([
    'pagination' => $pagination,
    'prevPageCssClass' => 'pagination-prev',
    'nextPageCssClass' => 'pagination-next'
]);
//在Ajax分页时，添加Js代码实现无刷新分页效果
$js = <<<JS
$('body').on('click', '.pagination a', function (e) {
    e.preventDefault();
    $.ajax({
        url: $(this).attr('href'),
        success: function(data){
            $('#result').html(data);
        }
    });
});
JS;
$this->registerJs($js);

In the above code, we can adjust the number of links in the paging control by setting the maxButtonCount property in the yiidataPagination object. When using the yiiwidgetsLinkPager control, we can use the prevPageCssClass and nextPageCssClass properties to control the style of turning pages forward and backward. When using Ajax technology, we can add registration Js code in the view to achieve a refresh-free paging effect.

Summary

In the Yii framework, paging is an important part. Using the paging control, you can easily realize the paging display of data and improve the user experience. In actual development, it needs to be used flexibly according to different needs and business scenarios. This article introduces how to use paging in the Yii framework. The example code is only a basic implementation and needs to be adjusted and optimized according to specific business logic.

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