Question

我为Codeigniter创建了一个嵌套的注释库，它的几乎正在工作。

我似乎无法在不回显每个<ul>或<li>元素的情况下输出嵌套的注释。我不希望库直接写入任何东西，我想将它保存到变量并返回它，以便我可以在视图中回显它。

这是库代码：

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

class Comments
{
    public $parents  = array();
    public $children = array();

    public function init($comments)
    {
        foreach ($comments as $comment)
        {
            if ($comment['parent_comment_id'] === NULL)
            {
                $this->parents[$comment['comment_id']][] = $comment;
            }
            else
            {
                $this->children[$comment['parent_comment_id']][] = $comment;
            }
        }

        $this->prepare($this->parents);

    } // End of init

    public function thread($comments)
    {
        if(count($comments))
        {
            echo '<ul>';

            foreach($comments as $c)
            {
                echo "<li>" . $c['text'];
                //Rest of what ever you want to do with each row

                if (isset($this->children[$c['comment_id']])) {
                    $this->thread($this->children[$c['comment_id']]);
                }

                echo "</li>";
            }
            echo "</ul>";
        }
    } // End of thread

    private function prepare()
    {
        foreach ($this->parents as $comment)
        {
            $this->thread($comment);
        }
    } // End of prepare

} // End of Comments class

以上代码生成：

- Parent
    - Child
        - Child Third level
- Second Parent
    - Second Child

或HTML：

<ul>
    <li>Parent
        <ul>
        <li>Child
            <ul>
                <li>Child Third level</li>
            </ul>
        </li>
        </ul>
    </li>
</ul>

<ul>
    <li>Second Parent
        <ul>
            <li>Second Child</li>
        </ul>
    </li>
</ul>

这是正确的HTML，但是回应它们是不可取的。

我试图做的是：

public function thread($comments)
    {
        if(count($comments))
        {
            $output = '<ul>';

            foreach($comments as $c)
            {
                $output .= "<li>" . $c['text'];
                //Rest of what ever you want to do with each row

                if (isset($this->children[$c['comment_id']])) {
                    $this->thread($this->children[$c['comment_id']]);
                }

                $output .= "</li>";
            }
            $output .= "</ul>";

            echo $output;
        }
    } // End of thread

这不能按预期工作，并在echo'd：

时生成以下内容

- Child Third level
- Child
- Parent
- Second Child
- Second Parent

或HTML：

<ul><li>Child Third level</li></ul>
<ul><li>Child</li></ul>
<ul><li>Parent</li></ul>
<ul><li>Second Child</li></ul>
<ul><li>Second Parent</li></ul>

这显然不是理想的，因为它没有嵌套评论。

我整天都被困在这一天，有人建议我如何才能正确生成列表？

Answer 1

试试这个：

public function thread($comments,$output='')
{
    if(count($comments))
    {
        $output. = '<ul>';

        foreach($comments as $c)
        {
            $output .= "<li>" . $c['text'];
            //Rest of what ever you want to do with each row

            if (isset($this->children[$c['comment_id']])) {
                $output.=$this->thread($this->children[$c['comment_id']],$output);
            }

            $output .= "</li>";
        }
        $output .= "</ul>";

        return $output;
    }
}

我还没有测试过，但它看起来应该有效！

Answer 2

问题是，在递归调用完成之前，您没有回显一个级别的输出，因为您正在将内容累积到$output变量中。而不是容纳它，只是在那一刻回应它：

public function thread($comments)
    {
        if(count($comments))
        {
            echo'<ul>';

            foreach($comments as $c)
            {
                echo "<li>" . $c['text'];
                //Rest of what ever you want to do with each row

                if (isset($this->children[$c['comment_id']])) {
                    $this->thread($this->children[$c['comment_id']]);
                }

                echo "</li>";
            }
            echo "</ul>";
        }
    } // End of thread

如何在没有echo的情况下输出嵌套/线程注释

2 个答案: