php – WordPress自定义小部件记住多个选择选项
作者:互联网
我正在为我们的网站编写一个自定义小部件来显示一些选定的帖子.在管理部分,我有一个多选框,让管理员按名称选择多个帖子.这工作正常,但是当我选择几个不同的帖子并保存时,没有任何东西被保存.
任何人都可以对此有所了解吗?
这是我的代码……
<?php
/*
Plugin Name: Hot Topics
Plugin URI: http://www.weddingideasmag.com
Description: Use this widget to choose an array of posts snippets to show
Version: 1.0)
Author: James Payne
Author URI: http://www.bluntcreative.co.uk
License: GPL2
*/
class HotTopics extends WP_Widget {
// constructor
function HotTopics() {
$widget_ops = array( 'name' => 'Hot Topics','classname' => 'widget-hot-topics', 'description' => __( "Use this widget to choose an array of posts snippets to show in the sidebar." ) );
$this->WP_Widget( 'hottopics', __('Hot Topics'), $widget_ops);
}
// widget form creation
function form($instance) {
// Check values
if( $instance) {
$select = esc_attr($instance['select']); // Added
} else {
$select ='';
}
?>
<select multiple="multiple" name="<?php echo $this->get_field_name('select'); ?>[]" id="<?php echo $this->get_field_id('select'); ?>" class="widefat" size="15" style="margin-bottom:15px;">
<?php
$args = array( 'offset'=> 1, 'orderby' => 'date', 'order' => 'DESC', 'posts_per_page' => 200, 'post_status' => 'publish' );
// The Query
query_posts( $args );
// The Loop
while ( have_posts() ) : the_post();
$title = get_the_title();
?>
<option value="<?php echo get_the_ID();?>" class="hot-topic" <?php $select == $title ? ' selected="selected"' : '';?> style="margin-bottom:3px;">
<?php echo $title;?>
</option>
<?php
endwhile;
// Reset Query
wp_reset_query();
?>
</select>
<?php
}
// update widget
function update($new_instance, $old_instance) {
$instance = $old_instance;
// Fields
$instance['select'] = strip_tags($new_instance['select']);
return $instance;
}
// widget display
function widget($args, $instance) {
/* ... */
echo 'tetst';
}
}
// register widget
add_action('widgets_init', create_function('', 'return register_widget("HotTopics");'));
?>
解决方法:
更新窗口小部件时,strip_tags正在销毁所选帖子的数组. esc_sql完成这项工作.另外,don’t use query_posts.最后,存储帖子标题并不理想,因为它可能会改变,ID是永久性的.
一份工作样本:
# PHP 5.3+ anonymous function
add_action( 'widgets_init', function() {
register_widget( 'Sample_Widget_SO_19246434' );
});
class Sample_Widget_SO_19246434 extends WP_Widget
{
function Sample_Widget_SO_19246434()
{
$this->WP_Widget(
'hottopics',
__('Hot Topics'),
array(
'name' => 'Hot Topics',
'classname' => 'widget-hot-topics',
'description' => __( "Description" )
)
);
}
function form( $instance )
{
if( $instance )
$select = $instance['select'];
else
$select ='';
$get_posts = get_posts( array(
'offset'=> 1,
'orderby' => 'date',
'order' => 'DESC',
'posts_per_page' => 200,
'post_status' => 'publish'
));
if( $get_posts )
{
printf(
'<select multiple="multiple" name="%s[]" id="%s" class="widefat" size="15">',
$this->get_field_name('select'),
$this->get_field_id('select')
);
foreach( $get_posts as $post )
{
printf(
'<option value="%s" class="hot-topic" %s style="margin-bottom:3px;">%s</option>',
$post->ID,
in_array( $post->ID, $select) ? 'selected="selected"' : '',
$post->post_title
);
}
echo '</select>';
}
else
echo 'No posts found :(';
}
function update( $new_instance, $old_instance )
{
$instance = $old_instance;
$instance['select'] = esc_sql( $new_instance['select'] );
return $instance;
}
function widget( $args, $instance )
{
echo 'Hello world';
}
}
有关:
•What’s the difference between esc_* functions?
•How to sanitize user input?
标签:wordpress,php,widget,multipleselection 来源: https://codeday.me/bug/20190529/1176484.html