wordpress进阶教程(七):自定义面板添加下拉框、选择框等表单项

上一篇文章，我们在wordpress后台文章编辑页面添加了自定义面板，并且在自定义面板中可以输入关键词和描述信息，但是我们仅仅使用了一个textarea文本域表单，这在实际应用中是远远不够的，实际应用我们可能需要文本框、文本域、单选框、复选框、下拉选择框、图片上传、甚至是wordpress自带的文本编辑器或者自己配置的文本编辑器以及各种带js特效的应用。

今天我们给自定义面板添加简单的表单：文本框、文本域、单选框、复选框、下拉选择框。

我们继续使用昨天的文件，改进昨天的代码。

首先准备工作：

先将昨天新建的metabox.php文件中的代码清楚，准备字段数组：我们可以参考前面后台教程中配置选项数组的方法来配置数据项：设置选项类文件使用方法：

$new_meta_boxes =
(
“title” => (
“name” => “_meta_title”,
“std” => “”,
“title” => “标题”,
“type”=>“title”),
“keywords” => (
“name” => “_meta_keywords”,
“std” => “”,
“title” => “关键字”,
“type”=>“text”),
“description” => (
“name” => “_meta_description”,
“std” => “”,
“title” => “描述”,
“type”=>“textarea”),
“category” => (
“name” => “_meta_cate”,
“std” => “”,
“title” => “选择分类”,
“subtype”=> “cat”,
“type”=>“dropdown”),
“radio” => (
“name” => “_meta_radio”,
“std” => 1,
“title” => “单选框”,
“buttons” => (‘Yes’,’No’),
“type”=>“radio”),
“checkbox” => (
“name” => “_meta_checkbox”,
“std” => 1,
“title” => “复选框”,
“type”=>“checkbox”),
);

二、创建(显示)面板内容的函数

new_meta_boxes() {
$post, $new_meta_boxes;
($new_meta_boxes $meta_box) {
//获取保存的是
$meta_box_value = get_post_meta($post->ID, $meta_box[‘name’].’_value’, true);
($meta_box_value != “”)
$meta_box[‘std’] = $meta_box_value;//将默认值替换为以保存的值
echo‘<input type=“hidden” name=“‘.$meta_box[‘name’].’_noncename” id=“‘.$meta_box[‘name’].’_noncename” value=“‘.wp_create_nonce( plugin_basename(__FILE__) ).'” />’;
//通过选择类型输出不同的html代码
( $meta_box[‘type’] ){
‘title’:
echo‘<h4>’.$meta_box[‘title’].'</h4>’;
;
‘text’:
echo‘<h4>’.$meta_box[‘title’].'</h4>’;
echo ‘<input type=“text” size=“40” name=“‘.$meta_box[‘name’].’_value” value=“‘.$meta_box[‘std’].'” /><br />’;
;
‘textarea’:
echo‘<h4>’.$meta_box[‘title’].'</h4>’;
echo ‘<textarea cols=“60” rows=“3” name=“‘.$meta_box[‘name’].’_value”>’.$meta_box[‘std’].'</textarea><br />’;
;
‘dropdown’:
echo‘<h4>’.$meta_box[‘title’].'</h4>’;
($meta_box[‘subtype’] == ‘cat’){
$select = ‘Select category’;
$entries = get_categories(‘title_li=&orderby=name&hide_empty=0’);//获取分类
}
echo ‘<p><select name=“‘.$meta_box[‘name’].’_value”> ‘;
echo ‘<option value=“”>’.$select .'</option> ‘;
($entries $key => $entry){
$id = $entry->term_id;
$title = $entry->name;
( $meta_box[‘std’] == $id ){
$selected = “selected=’selected'”;
}{
$selected = “”;
}
echo “<option $selected value='”. $id.“‘>”. $title.“</option>”;
}
echo ‘</select><br />’;
;
‘radio’:
echo‘<h4>’.$meta_box[‘title’].'</h4>’;
$counter = 1;
( $meta_box[‘buttons’] $radiobutton ) {
$checked =“”;
(isset($meta_box[‘std’]) && $meta_box[‘std’] == $counter) {
$checked = ‘checked = “checked”‘;
}
echo ‘<input ‘.$checked.’ type=“radio” =“kcheck” value=“‘.$counter.'” name=“‘.$meta_box[‘name’].’_value”/>’.$radiobutton;
$counter++;
}
;
‘checkbox’:
echo‘<h4>’.$meta_box[‘title’].'</h4>’;
( isset($meta_box[‘std’]) && $meta_box[‘std’] == ‘true’ )
$checked = ‘checked = “checked”‘;
$checked = ”;
echo ‘<input type=“checkbox” name=“‘.$meta_box[‘name’].’_value” value=“true” ‘.$checked.’ />’;
;
}
}
}

三、创建面板

create_meta_box() {
$theme_name;
( function_exists(‘add_meta_box’) ) {
add_meta_box( ‘-meta-boxes’, ‘自定义模块’, ‘new_meta_boxes’, ‘post’, ‘normal’, ‘high’ );
}
}

四、保存更新数据

save_postdata( $post_id ) {
$post, $new_meta_boxes;
($new_meta_boxes $meta_box) {
( !wp_verify_nonce( $_POST[$meta_box[‘name’].’_noncename’], plugin_basename() )) {
$post_id;
}
( ‘page’ == $_POST[‘post_type’] ) {
( !current_user_can( ‘edit_page’, $post_id ))
$post_id;
}
{
( !current_user_can( ‘edit_post’, $post_id ))
$post_id;
}
$data = $_POST[$meta_box[‘name’].’_value’];
(get_post_meta($post_id, $meta_box[‘name’].’_value’) == “”)
add_post_meta($post_id, $meta_box[‘name’].’_value’, $data, true);
($data != get_post_meta($post_id, $meta_box[‘name’].’_value’, true))
update_post_meta($post_id, $meta_box[‘name’].’_value’, $data);
($data == “”)
delete_post_meta($post_id, $meta_box[‘name’].’_value’, get_post_meta($post_id, $meta_box[‘name’].’_value’, true));
}
}