Code example for implementing 'previous article, next article' function in yii2-PHP Tutorial-php.cn

Code example for implementing 'previous article, next article' function in yii2

高洛峰

Release： 2023-03-05 13:10:01

Original

1314 people have browsed it

I recently made a short answer article details page. I need to add the previous article and next article buttons at the bottom of the page. After analysis, the most basic need is the title and id of the article (as parameters).

At first I thought of adding or subtracting 1 to the current id, but considering that it would be wrong if part of the id was lost, I queried records larger and smaller than the current id respectively and limited them to one, so I came up with the following code.

The code is as follows, please tell me if it is wrong.

In controller

//查询上-篇文章
    $prev_article = 你的模型::find()
      ->andFilterWhere([&#39;<&#39;, &#39;id&#39;, $id])
      ->andFilterWhere([其他条件)
      ->orderBy([&#39;id&#39; => SORT_DESC])
      ->limit(1)
      ->one();
    //查询下-篇文章
    $next_article = 你的模型::find()
      ->andFilterWhere([&#39;>&#39;, &#39;id&#39;, $id])
      ->andFilterWhere(其他条件)
      ->orderBy([&#39;id&#39; => SORT_ASC])
      ->limit(1)
      ->one();
 
 
    $model[&#39;prev_article&#39;] = [
      &#39;url&#39; => !is_null($prev_article) ? Url::current([&#39;id&#39;=>$prev_article->id]) : &#39;javascript:;&#39;,
      &#39;title&#39; => !is_null($prev_article) ? $prev_article->title : &#39;没有了&#39;,
    ];
 
    $model[&#39;next_article&#39;] = [
      &#39;url&#39; => !is_null($next_article) ? Url::current([&#39;id&#39;=>$next_article->id]) : &#39;javascript:;&#39;,
      &#39;title&#39; => !is_null($next_article) ? $next_article->title : &#39;没有了&#39;,
    ];
 
    return $this->render(&#39;view&#39;, 
      &#39;model&#39; => $model, 
    );

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In view

<div class="left">
    <p>上一篇:
      <a href="<?=$model[&#39;prev_article&#39;][&#39;url&#39;]?>">
        <?=$model[&#39;prev_article&#39;][&#39;title&#39;]?>
      </a>
    </p>
  </div>
  <div class="right">
    <p>下一篇:
      <a href="<?=$model[&#39;next_article&#39;][&#39;url&#39;]?>">
        <?=$model[&#39;next_article&#39;][&#39;title&#39;]?>
      </a>
    </p>
  </div>

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