我有一个插件，有两种自定义的帖子类型-项目和任务。在插件中，您可以将任务分配给项目。例如，你可能有一个“网站设计”项目，任务是“购买域名”、“自定义主题”、“添加内容”等。

我要做的是创建一个项目列表，并在每个项目下面创建一个嵌套的任务列表，如下所示。

项目1任务1任务2在HTML中，我知道这是可行的：

<ul>
    <li>Project 1
        <ul>
            <li>Task 1</li>
            <li>Task 2</li>
        </ul>
    </li>
    <li>Project 2
        <ul>
            <li>Task 3</li>
            <li>Task 4</li>
        </ul>
    </li>
</ul>

我的插件在两个单独的函数中为项目和任务生成列表。我通过使用将任务包括在项目列表中do_action( \'my-task-action\', $project_id )

Display projects

$project_option .= \'<ul class="project-list">\';
    foreach( $projects as $project ) {
    $project_id = $project->ID;
    $project_option .= \'
        <li class="project" id="project-\' . $project_id . \'">
            <span class="project-title">\' . get_the_title( $project_id ) . \' </span>
            <span class="project-status-title">\' . __( \'Project Status: \', \'client-area\' ) . \'</span>
            <span class="project-status">\' .  get_post_meta( $project_id, \'project-status\', true ) . \'</span>\' .
            do_action( \'my-task-action\', $project_id ) . \'
        </li>\';
    }
$project_option .= \'</ul>\';
echo $project_option;

Display Tasks

显示任务的函数通过do_action( \'my-task-action\', $project_id ), 并可以显示分配给每个项目的每个任务。

$task_option .= \'<ul class="task-list">\';
    foreach( $tasks as $task ) {
        $task_id = $task->ID;
        $task_option .= \'
        <li class="task project-\' . $project_id . \'" id="task-\' . $task_id . \'">
            <span class="task-title">\' . get_the_title( $task_id ) . \' </span>
            <span class="task-status-title">\' . __( \'Task Status: \', \'client-area\' ) . \'</span>
            <span class="task-status">\' .  get_post_meta( $task_id, \'task-status\', true ) . \'</span>
        </li>\';
    }
    $task_option .= \'</ul>\';
}
echo $task_option;

The Problem

我将任务放在一个列表中，项目放在一个单独的列表中，而不是像上面显示的那样嵌套列表。

任务1任务2任务3任务4

项目1

项目2或。。。

<ul class="task-list">
    <li class="task project-1023" id="task-929">
        <span class="task-title">Task 1 </span>
        <span class="task-status-title">Task Status: </span>
        <span class="task-status">on-hold</span>
    </li>
    <li class="task project-1023" id="task-927">
        <span class="task-title">Task 2 </span>
        <span class="task-status-title">Task Status: </span>
        <span class="task-status">not-started</span>
    </li>
    <li class="task project-930" id="task-931">
        <span class="task-title">Task 3 </span>
        <span class="task-status-title">Task Status: </span>
        <span class="task-status">on-hold</span>
    </li>
    <li class="task project-930" id="task-932">
        <span class="task-title">Task 4 </span>
        <span class="task-status-title">Task Status: </span>
        <span class="task-status">not-started</span>
    </li>
</ul>
<ul class="project-list">
    <li class="project" id="project-1023">
        <span class="project-title">Project 1 </span>
        <span class="project-status-title">Project Status: </span>
        <span class="project-status">in-progress</span>
    </li>
    <li class="project" id="project-930">
        <span class="project-title">Project 2 </span>
        <span class="project-status-title">Project Status: </span>
        <span class="project-status">complete</span>
    </li>
</ul>

根据do\\u操作在列表中的位置，我认为任务列表只会在项目的<li></li>, 并使用嵌套列表。

你知道为什么我没能如愿吗？

$project_option .= \'<ul class="project-list">\';
    foreach( $projects as $project ) {
    $project_id = $project->ID;
    $project_option .= \'
        <li class="project" id="project-\' . $project_id . \'">
            <span class="project-title">\' . get_the_title( $project_id ) . \' </span>
            <span class="project-status-title">\' . __( \'Project Status: \', \'client-area\' ) . \'</span>
            <span class="project-status">\' .  get_post_meta( $project_id, \'project-status\', true ) . \'</span>\' .
            apply_filters( \'my-task-action\', $project_id ) . \'
        </li>\';
    }
$project_option .= \'</ul>\';
echo $project_option;

add_filter(\'my-task-action\', \'wpse241018_getTaskActions\');

function wpse241018_getTaskActions($project_id){ 
    $task_option .= \'<ul class="task-list">\';
    foreach( $tasks as $task ) {
        $task_id = $task->ID;
        $task_option .= \'
        <li class="task project-\' . $project_id . \'" id="task-\' . $task_id . \'">
            <span class="task-title">\' . get_the_title( $task_id ) . \' </span>
            <span class="task-status-title">\' . __( \'Task Status: \', \'client-area\' ) . \'</span>
            <span class="task-status">\' .  get_post_meta( $task_id, \'task-status\', true ) . \'</span>
        </li>\';
     }
    $task_option .= \'</ul>\';
    }
    return $task_option; 
}