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分页
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==========
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当一次要在一个页面上显示很多数据时,通过需要将其分为
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几部分,每个部分都包含一些数据列表并且一次只显示一部分。这些部分被称为
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分页,例如 pagination。
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如果你使用 [data provider](output-data-providers.md) 和 [data widgets](output-data-widgets.md) 中之一,
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pagination 已经为你自动分页。否则,你需要创建 [[\yii\data\Pagination]]
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对象,为其填充数据例如 [[\yii\data\Pagination::$totalCount|total item count]],
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[[\yii\data\Pagination::$pageSize|page size]] 和 [[\yii\data\Pagination::$page|current page]],在
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查询中使用它并且填充到 [[\yii\widgets\LinkPager|link pager]]。
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首先在 controller action,我们创建 pagination 对象并且为其填充数据:
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```php
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function actionIndex()
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{
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$query = Article::find()->where(['status' => 1]);
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$countQuery = clone $query;
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$pages = new Pagination(['totalCount' => $countQuery->count()]);
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$models = $query->offset($pages->offset)
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->limit($pages->limit)
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->all();
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return $this->render('index', [
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'models' => $models,
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'pages' => $pages,
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]);
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}
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```
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其次在视图中我们输出的模板为当前页并通过 pagination 对象链接到该页:
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```php
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foreach ($models as $model) {
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// display $model here
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}
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// display pagination
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echo LinkPager::widget([
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'pagination' => $pages,
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]);
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```
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