【发布时间】：2013-09-09 06:14:33
【问题描述】：
所以这是我第一次尝试创建一个具有创建简单图像翻转效果功能的小部件（如果有人在完成后想要它，请给我留言）。
现在我下载了一个示例小部件并进行了一些更改，但我还没有触及输出的 html 部分，所以忽略那一点。现在我的问题是，当我单击保存时，字段中的值会恢复为默认值，并且他们没有在示例小部件上执行此操作。这是我的代码：
<?php
/**
* Plugin Image: Rollover Widget
* Description: A widget that creates a rollover image effect with a hyperlink.
* Version: 0.1
* Author: Zak Elas
* Author URI:
*/
add_action( 'widgets_init', 'my_widget' );
function my_widget() {
register_widget( 'MY_Widget' );
}
class MY_Widget extends WP_Widget {
function MY_Widget() {
$widget_ops = array( 'classname' => 'example', 'description' => __('A widget that creates a rollover image effect with a hyperlink. ', 'example') );
$control_ops = array( 'width' => 300, 'height' => 350, 'id_base' => 'Rollover Widget' );
$this->WP_Widget( 'example-widget', __('Example Widget', 'example'), $widget_ops, $control_ops );
}
function widget( $args, $instance ) {
extract( $args );
//Our variables from the widget settings.
$link = apply_filters('widget_link', $instance['link'] );
$image = $instance['image'];
$rollover_image = $instance['rollover_image'];
echo $before_widget;
// Display the widget link
if ( $link )
echo $before_link . $link . $after_link;
//Display the name
printf( '<p>' . __('Hey their Sailor! My name is %1$s.', 'example') . '</p>', $image );
printf( '<p>' . __('Hey their Sailor! My name is %1$s.', 'example') . '</p>', $rollover_image );
echo $after_widget;
}
//Update the widget
function update( $new_instance, $old_instance ) {
$instance = $old_instance;
//Strip tags from link and name to remove HTML
$instance['link'] = strip_tags( $new_instance['link'] );
$instance['image'] = strip_tags( $new_instance['image'] );
$instance['rollover_image'] = strip_tags( $new_instance['rollover_image'] );
return $instance;
}
function form( $instance ) {
//Set up some default widget settings.
$defaults = array( 'link' => __('Example', 'example'), 'image' => __('/images/editorial.png', 'example') , 'rollover_image' => __('/images/editorial.png', 'example') );
$instance = wp_parse_args( (array) $instance, $defaults ); ?>
<p>
<label for="<?php echo $this->get_field_id( 'link' ); ?>"><?php _e('link', 'example'); ?></label>
<input id="<?php echo $this->get_field_id( 'link' ); ?>" name="<?php echo $this->get_field_name( 'link' ); ?>" value="<?php echo $instance['link']; ?>" style="width:100%;" />
</p>
<p>
<label for="<?php echo $this->get_field_id( 'image' ); ?>"><?php _e('image', 'example'); ?></label>
<input id="<?php echo $this->get_field_id( 'image' ); ?>" name="<?php echo $this->get_field_name( 'image' ); ?>" value="<?php echo $instance['image']; ?>" style="width:100%;" />
</p>
<p>
<label for="<?php echo $this->get_field_id( 'rollover_image' ); ?>"><?php _e('rollover_image:', 'example'); ?></label>
<input id="<?php echo $this->get_field_id( 'rollover_image' ); ?>" name="<?php echo $this->get_field_name( 'image' ); ?>" value="<?php echo $instance['rollover_image']; ?>" style="width:100%;" />
</p>
<?php
}
}
?>
这里是示例小部件代码
<?php
/**
* Plugin Name: A simple Widget
* Description: A widget that displays authors name.
* Version: 0.1
* Author: Bilal Shaheen
* Author URI: http://gearaffiti.com/about
*/
add_action( 'widgets_init', 'my_widget' );
function my_widget() {
register_widget( 'MY_Widget' );
}
class MY_Widget extends WP_Widget {
function MY_Widget() {
$widget_ops = array( 'classname' => 'example', 'description' => __('A widget that displays the authors name ', 'example') );
$control_ops = array( 'width' => 300, 'height' => 350, 'id_base' => 'example-widget' );
$this->WP_Widget( 'example-widget', __('Example Widget', 'example'), $widget_ops, $control_ops );
}
function widget( $args, $instance ) {
extract( $args );
//Our variables from the widget settings.
$title = apply_filters('widget_title', $instance['title'] );
$name = $instance['name'];
$show_info = isset( $instance['show_info'] ) ? $instance['show_info'] : false;
echo $before_widget;
// Display the widget title
if ( $title )
echo $before_title . $title . $after_title;
//Display the name
if ( $name )
printf( '<p>' . __('Hey their Sailor! My name is %1$s.', 'example') . '</p>', $name );
if ( $show_info )
printf( $name );
echo $after_widget;
}
//Update the widget
function update( $new_instance, $old_instance ) {
$instance = $old_instance;
//Strip tags from title and name to remove HTML
$instance['title'] = strip_tags( $new_instance['title'] );
$instance['name'] = strip_tags( $new_instance['name'] );
$instance['show_info'] = $new_instance['show_info'];
return $instance;
}
function form( $instance ) {
//Set up some default widget settings.
$defaults = array( 'title' => __('Example', 'example'), 'name' => __('Bilal Shaheen', 'example'), 'show_info' => true );
$instance = wp_parse_args( (array) $instance, $defaults ); ?>
//Widget Title: Text Input.
<p>
<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e('Title:', 'example'); ?></label>
<input id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo $instance['title']; ?>" style="width:100%;" />
</p>
//Text Input.
<p>
<label for="<?php echo $this->get_field_id( 'name' ); ?>"><?php _e('Your Name:', 'example'); ?></label>
<input id="<?php echo $this->get_field_id( 'name' ); ?>" name="<?php echo $this->get_field_name( 'name' ); ?>" value="<?php echo $instance['name']; ?>" style="width:100%;" />
</p>
//Checkbox.
<p>
<input class="checkbox" type="checkbox" <?php checked( $instance['show_info'], true ); ?> id="<?php echo $this->get_field_id( 'show_info' ); ?>" name="<?php echo $this->get_field_name( 'show_info' ); ?>" />
<label for="<?php echo $this->get_field_id( 'show_info' ); ?>"><?php _e('Display info publicly?', 'example'); ?></label>
</p>
<?php
}
}
?>
【问题讨论】：
标签： php html wordpress content-management-system