javascript - WordPress 小部件中的动态输入字段

Question

我正在尝试为我正在处理的主题的自定义小部件中的一组预定义标签创建动态输入字段。我想实现这样的目标:

CourseName           FieldONE             FieldTWO
-------------------------------------------------------------
Chemistry            Sprint 2015          Summer 2015  ( - )
                     Spring 2016          Summer 2016  ( - )
                                                       ( + )
-------------------------------------------------------------
Biology              Sprint 2015          Summer 2015  ( - )
                     Fall 2015            Winter 2015  ( - )
                     Spring 2016          Summer 2016  ( - )
                                                       ( + )
--------------------------------------------------------------
Math                 Fall 2015            Winter 2015  ( - )
                                                       ( + )
--------------------------------------------------------------
Physics              Fall 2015            Winter 2015  ( - )
                                                       ( + )
--------------------------------------------------------------

其中 CourseName 是化学、生物学、数学和物理(仅预定义标签，最多 4 个)，FieldONE 和 FieldTWO 是动态输入我想为每门类(class)输入不同的术语。

因此，如果我单击 ( + )，将为该标签创建两个字段 FieldOne 和 FieldTWO。如果我单击 ( - )，这两个字段都会被删除。

我尝试使用 this Gist它创建了与 metabox 类似的动态输入，到目前为止我得到了这个:

<?php
/*
Plugin Name: Dynamic Fields Widget
Description: Dynamic Fields
Version: 0.0
Author: Rain Man
*/
// Creating the widget
class dynamic_widget extends WP_Widget
{
    public function __construct()
    {
        parent::__construct(
          // Base ID of your widget
          'dynamic_widget',

          // Widget name will appear in UI
          __('Dynamic Widget', 'dynamic_widget_domain'),

          // Widget description
          array('description' => __('Sample Dynamic Widget', 'dynamic_widget_domain'))
        );
    }

// widget
public function widget($args, $instance)
{
    $title = apply_filters('widget_title', $instance['title']);
// This is where you run the code and display the output
echo __('Hello, World!', 'dynamic_widget_domain');
    echo $args['after_widget'];
}

// form
public function form($instance)
{
    if (isset($instance[ 'title' ])) {
        $title = $instance[ 'title' ];
    } else {
        $title = __('New title', 'dynamic_widget_domain');
    }
// Widget admin form

    $repeatable_fields = array();
    $courses = array(
      'Chemistry'    => array(
        'coursecode'   => 'Chemistry 2059',
        'professor' => 'Dr. James Bond',
      ),
      'Biology'   => array(
        'coursecode'   => 'Biology 3029',
        'professor' => 'Dr. James Bond',
      ),
      'Math' => array(
        'coursecode'   => 'Math 2043',
        'professor' => 'Dr. James Bond',
      ),
      'Physics'  => array(
        'coursecode'   => 'Physics 2075',
        'professor' => 'Dr. James Bond',
      )
    );
     ?>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

<script type="text/javascript">
jQuery(document).ready(function( $ ){
  $( '#add-row' ).on('click', function() {
    var row = $( '.empty-row.screen-reader-text' ).clone(true);
    row.removeClass( 'empty-row screen-reader-text' );
    row.insertBefore( '#repeatable-fieldset-one tbody>tr:last' );
    return false;
  });

  $( '.remove-row' ).on('click', function() {
    $(this).parents('tr').remove();
    return false;
  });
});
</script>
<?php foreach ($courses as $course_key => $course_info) { ?>
<label><?php echo $course_info['coursecode']; ?></label>
<table id="repeatable-fieldset-one" width="100%">
<thead>
  <tr>
    <th width="40%">Fall Term</th>
    <th width="40%">Winter Term</th>
    <th width="8%"></th>
  </tr>
</thead>
<tbody>
<?php

if ($repeatable_fields) :

foreach ($repeatable_fields as $field) {
    ?>
<tr>
  <td><input type="text" class="widefat" name="name[]" value="<?php if ($field['name'] != '') {
    echo esc_attr($field['name']);
} ?>" /></td>

  <td>
  </td>

  <td><input type="text" class="widefat" name="url[]" value="<?php if ($field['url'] != '') {
    echo esc_attr($field['url']);
} else {
    echo '';
} ?>" /></td>

  <td><a class="button remove-row" href="#">Remove</a></td>
  <td><a id="add-row" class="button" href="#">Add</a></td>

</tr>
<?php

} else :
// show a blank one

?>
<tr>
  <td><input type="text" class="widefat" name="name[]" /></td>


  <td><input type="text" class="widefat" name="url[]" value="" /></td>

  <td><a class="button remove-row" href="#">Remove</a></td>
  <td><a id="add-row" class="button" href="#">Add</a></td>

</tr>
<?php endif; ?>
<? } ?>


<!-- empty hidden one for jQuery -->
<tr class="empty-row screen-reader-text">
  <td><input type="text" class="widefat" name="name[]" /></td>

  <td><input type="text" class="widefat" name="url[]" value="" /></td>

  <td><a class="button remove-row" href="#">Remove</a></td>
  <td><a id="add-row" class="button" href="#">Add</a></td>

</tr>
</tbody>
</table>
</p>
<?php

}

// update
public function update($new_instance, $old_instance)
{
    $instance = array();
    $instance['title'] = (!empty($new_instance['title'])) ? strip_tags($new_instance['title']) : '';

    return $instance;
}
} // Class dynamic_widget ends here

// Register and load the widget
function wpb_load_widget()
{
    register_widget('dynamic_widget');
}
add_action('widgets_init', 'wpb_load_widget');

这是截图:

现在有很多问题，首先是javascript“添加”按钮不再起作用，我不确定如何保存数据以便以后访问。

知道如何为标签制作动态输入字段吗？它不必与我分享的要点中的代码相似，但最好是我们可以让我的修改生效。

Answer 1

试试这个代码，我测试过它并且有效。 js代码需要插入到footer中，而不是widget中，否则点击按钮会执行两次。

在函数 widget() 中，您将看到显示输入值的循环。

    <?php
/*
Plugin Name: Dynamic Fields Widget
Description: Dynamic Fields
Version: 0.0
Author: Rain Man
*/
// Creating the widget
class dynamic_widget extends WP_Widget
{
    public $courses;
    public function __construct()
    {
        parent::__construct(
          // Base ID of your widget
          'dynamic_widget',

          // Widget name will appear in UI
          __('Dynamic Widget', 'dynamic_widget_domain'),

          // Widget description
          array('description' => __('Sample Dynamic Widget', 'dynamic_widget_domain'))
        );
        $this->courses = array(
          'Chemistry'    => array(
            'coursecode'   => 'Chemistry 2059',
            'professor' => 'Dr. James Bond',
          ),
          'Biology'   => array(
            'coursecode'   => 'Biology 3029',
            'professor' => 'Dr. James Bond',
          ),
          'Math' => array(
            'coursecode'   => 'Math 2043',
            'professor' => 'Dr. James Bond',
          ),
          'Physics'  => array(
            'coursecode'   => 'Physics 2075',
            'professor' => 'Dr. James Bond',
          )
        );
        add_action( 'in_admin_footer',array( $this,'jsfooter'));
    }
    public function jsfooter() {
    ?>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

    <script type="text/javascript">
    jQuery(document).ready(function( $ ){
        $(document ).off('click').on('click','div.open .add-row' , function() {

        var row = $(this).closest('tr').clone(true);
        row.find('input').each(function(){
            $(this).val("");
        });
        // row.insertBefore( '#repeatable-fieldset-one tbody>tr:last' );
        $(this).parents('tr').after(row);

        return false;
      });

      $( document).on('click',  'div.open .remove-row',function() {
          if ($(this).parents('tbody').find('tr').length >1) {
            $(this).parents('tr').remove(); 
        }
        return false;
      });
    });
    </script>
    <?php
    }

// widget
public function widget($args, $instance)
{
    $title = apply_filters('widget_title', $instance['title']);
// This is where you run the code and display the output
    foreach ($this->courses as $course_key => $course_info) {
        echo $course_info['coursecode'] .'<br>'; 
        foreach ($instance['repeat'][$course_key ]["fall"] as $k=>$field) {
            echo 'Fall Term ' . $field .' / ';
            echo 'Winter Term ' . $instance['repeat'][$course_key ]["winter"][$k] .'<br>';
        }
    }

    echo $args['after_widget'];
}

// form
public function form($instance)
{
    if (isset($instance[ 'title' ])) {
        $title = $instance[ 'title' ];
    } else {
        $title = __('New title', 'dynamic_widget_domain');
    }
// Widget admin form
    $repeatable_fields= isset ( $instance['repeat'] ) ? $instance['repeat'] : array();
     ?>

<?php foreach ($this->courses as $course_key => $course_info) { ?>
<label><?php echo $course_info['coursecode']; ?></label>
<table id="repeatable-fieldset-one" width="100%">
<thead>
  <tr>
    <th width="40%">Fall Term</th>
    <th width="40%">Winter Term</th>
    <th width="8%"></th>
    <th width="8%"></th>
  </tr>
</thead>
<tbody>
<?php

if ($repeatable_fields[$course_key ]["fall"] || $repeatable_fields[$course_key ]["winter"]) :
foreach ($repeatable_fields[$course_key ]["fall"] as $k=>$field) {
    ?>
<tr>
  <td><input type="text" class="widefat" name="<?php echo $this->get_field_name( 'repeat' )?>[<?php echo $course_key;?>][fall][]" value="<?php echo $field; ?>" /></td>

  <td><input type="text" class="widefat" name="<?php echo $this->get_field_name( 'repeat' )?>[<?php echo $course_key;?>][winter][]" value="<?php echo $repeatable_fields[$course_key ]["winter"][$k]; ?>" /></td>

  <td><a class="button remove-row" href="#">Remove</a></td>
  <td><a class="button add-row" class="button" href="#">Add</a></td>

</tr>
<?php
} else :
// show a blank one

?>
<tr>
  <td><input type="text" class="widefat" name="<?php echo $this->get_field_name( 'repeat' )?>[<?php echo $course_key;?>][fall][]" /></td>


  <td><input type="text" class="widefat" name="<?php echo $this->get_field_name( 'repeat' )?>[<?php echo $course_key;?>][winter][]" value="" /></td>

  <td><a class="button remove-row" href="#">Remove</a></td>
  <td><a class="button add-row" class="button" href="#">Add</a></td>

</tr>
<?php endif; ?>
</tbody>
</table>
<?php } ?>


<!-- empty hidden one for jQuery -->

<?php

}

// update
public function update($new_instance, $old_instance)
{
    $instance = array();
    $instance['title'] = (!empty($new_instance['title'])) ? strip_tags($new_instance['title']) : '';
    $instance['repeat'] = array();

    if ( isset ( $new_instance['repeat'] ) )
    {
        foreach ( $new_instance['repeat'] as $k =>$value )
        {
                $instance['repeat'][$k] = $value;
        }
    }

    return $instance;
}
} // Class dynamic_widget ends here

// Register and load the widget
function wpb_load_widget()
{
    register_widget('dynamic_widget');
}
add_action('widgets_init', 'wpb_load_widget');

数据将以这样的数组形式存储在 $instance['repeat"] 中(以了解我是如何创建循环的)

    array (size=4)
  'Chemistry' => 
    array (size=2)
      'fall' => 
        array (size=1)
          0 => string 'AAA' (length=3)
      'winter' => 
        array (size=1)
          0 => string 'BBBBBBB' (length=7)
  'Biology' => 
    array (size=2)
      'fall' => 
        array (size=2)
          0 => string 'CCCCCC' (length=6)
          1 => string 'EEEEEEE' (length=7)
      'winter' => 
        array (size=2)
          0 => string 'DDDD' (length=4)
          1 => string 'FFFFFFFF' (length=8)
  'Math' => 
    array (size=2)
      'fall' => 
        array (size=1)
          0 => string 'GGGGGGG' (length=7)
      'winter' => 
        array (size=1)
          0 => string 'HHHHHH' (length=6)
  'Physics' => 
    array (size=2)
      'fall' => 
        array (size=1)
          0 => string 'IIIIIIIII' (length=9)
      'winter' => 
        array (size=1)
          0 => string 'JJJJJJJJ' (length=8)