在自定义帖子中上载多个精选图片(Wordpress) [英] Upload multiple featured images in a custom post (Wordpress)
问题描述
我有一条自定义帖子,我想上传许多特色图片。我知道有一些插件可以执行此操作,但是我想在不安装插件的情况下进行尝试。可能吗?
感谢您的帮助/意见
I have a custom post and I would like to upload many featured images. I know there are some plugins doing that but I would like to try it without installing a plugin. Is it possible? Any help/opinion is appreciated
推荐答案
嗯,只有一个特色图片。但是您可以创建一个自定义元框,在其中可以添加新图像。这是使用wordpress上传器的示例:
Well, there is only ONE featured image. But you could create a custom meta box where you could add new images. Here's an example using the wordpress uploader:
functions.php 或 my-plugin.php :
//init the meta box
add_action( 'after_setup_theme', 'custom_postimage_setup' );
function custom_postimage_setup(){
add_action( 'add_meta_boxes', 'custom_postimage_meta_box' );
add_action( 'save_post', 'custom_postimage_meta_box_save' );
}
function custom_postimage_meta_box(){
//on which post types should the box appear?
$post_types = array('post','page');
foreach($post_types as $pt){
add_meta_box('custom_postimage_meta_box',__( 'More Featured Images', 'yourdomain'),'custom_postimage_meta_box_func',$pt,'side','low');
}
}
function custom_postimage_meta_box_func($post){
//an array with all the images (ba meta key). The same array has to be in custom_postimage_meta_box_save($post_id) as well.
$meta_keys = array('second_featured_image','third_featured_image');
foreach($meta_keys as $meta_key){
$image_meta_val=get_post_meta( $post->ID, $meta_key, true);
?>
<div class="custom_postimage_wrapper" id="<?php echo $meta_key; ?>_wrapper" style="margin-bottom:20px;">
<img src="<?php echo ($image_meta_val!=''?wp_get_attachment_image_src( $image_meta_val)[0]:''); ?>" style="width:100%;display: <?php echo ($image_meta_val!=''?'block':'none'); ?>" alt="">
<a class="addimage button" onclick="custom_postimage_add_image('<?php echo $meta_key; ?>');"><?php _e('add image','yourdomain'); ?></a><br>
<a class="removeimage" style="color:#a00;cursor:pointer;display: <?php echo ($image_meta_val!=''?'block':'none'); ?>" onclick="custom_postimage_remove_image('<?php echo $meta_key; ?>');"><?php _e('remove image','yourdomain'); ?></a>
<input type="hidden" name="<?php echo $meta_key; ?>" id="<?php echo $meta_key; ?>" value="<?php echo $image_meta_val; ?>" />
</div>
<?php } ?>
<script>
function custom_postimage_add_image(key){
var $wrapper = jQuery('#'+key+'_wrapper');
custom_postimage_uploader = wp.media.frames.file_frame = wp.media({
title: '<?php _e('select image','yourdomain'); ?>',
button: {
text: '<?php _e('select image','yourdomain'); ?>'
},
multiple: false
});
custom_postimage_uploader.on('select', function() {
var attachment = custom_postimage_uploader.state().get('selection').first().toJSON();
var img_url = attachment['url'];
var img_id = attachment['id'];
$wrapper.find('input#'+key).val(img_id);
$wrapper.find('img').attr('src',img_url);
$wrapper.find('img').show();
$wrapper.find('a.removeimage').show();
});
custom_postimage_uploader.on('open', function(){
var selection = custom_postimage_uploader.state().get('selection');
var selected = $wrapper.find('input#'+key).val();
if(selected){
selection.add(wp.media.attachment(selected));
}
});
custom_postimage_uploader.open();
return false;
}
function custom_postimage_remove_image(key){
var $wrapper = jQuery('#'+key+'_wrapper');
$wrapper.find('input#'+key).val('');
$wrapper.find('img').hide();
$wrapper.find('a.removeimage').hide();
return false;
}
</script>
<?php
wp_nonce_field( 'custom_postimage_meta_box', 'custom_postimage_meta_box_nonce' );
}
function custom_postimage_meta_box_save($post_id){
if ( ! current_user_can( 'edit_posts', $post_id ) ){ return 'not permitted'; }
if (isset( $_POST['custom_postimage_meta_box_nonce'] ) && wp_verify_nonce($_POST['custom_postimage_meta_box_nonce'],'custom_postimage_meta_box' )){
//same array as in custom_postimage_meta_box_func($post)
$meta_keys = array('second_featured_image','third_featured_image');
foreach($meta_keys as $meta_key){
if(isset($_POST[$meta_key]) && intval($_POST[$meta_key])!=''){
update_post_meta( $post_id, $meta_key, intval($_POST[$meta_key]));
}else{
update_post_meta( $post_id, $meta_key, '');
}
}
}
}
到创建更多图像,您可以调整 custom_postimage_meta_box_func($ post)
和中的
$ meta_keys
-Array custom_postimage_meta_box_save($ post)
To create more images you can adjust the$meta_keys
-Array in custom_postimage_meta_box_func($post)
and custom_postimage_meta_box_save($post)
要获取保存的图像ID,可以使用 get_post_meta($ post_id,'second_featured_image ',true);
。因此,也许像这样:
To get the saved image ID, you can use get_post_meta( $post_id, 'second_featured_image', true);
. So maybe like this:
<?php echo wp_get_attachment_image(get_post_meta($ post_id,'second_featured_image',true),'缩略图'); ?>
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