问题
I am making a simple plugin where user can choose custom post or post list for each woocommerce product category. I am using select2 for selecting post list
Why its not saving ?
Failed to save data for the field.
<?php
if ( ! defined( 'ABSPATH' ) ) { exit; }
/*----------------------------------------------------------------------
Adding Ajax Search for POSTS
-------------------------------------------------------------------------*/
function ex_get_posts_ajax_callback(){
global $post;
// we will pass post IDs and titles to this array
$return = array();
// you can use WP_Query, query_posts() or get_posts() here - it doesn't matter
$search_results = new WP_Query( array(
's'=> $_GET['q'], // the search query
'post_type' => 'post',//post type
'post_status' => 'publish', // if you don't want drafts to be returned
'ignore_sticky_posts' => 1,
'posts_per_page' => 20 // how much to show at once
) );
if( $search_results->have_posts() ) :
while( $search_results->have_posts() ) : $search_results->the_post();
// shorten the title a little
$title = ( mb_strlen( $search_results->post->post_title ) > 50 ) ? mb_substr( $search_results->post->post_title, 0, 49 ) . '...' : $search_results->post->post_title;
$return[] = array( $search_results->post->ID, $title ); // array( Post ID, Post Title )
endwhile;
endif;
wp_send_json( $return );
}
add_action( 'wp_ajax_getpostsearch', 'ex_get_posts_ajax_callback' ); // wp_ajax_{action}
//html output for edit field
function ex_product_cat_feature_posts($post_object) {
global $post;
// Nonce field to validate form request came from current site
wp_nonce_field( basename( __FILE__ ), '_feature_post_nonce' );
$html = '';
// always array because we have added [] to our <select> name attribute
$ex_product_cat_feature_post = get_post_meta( $post_object->ID, 'ex_product_cat_feature_post', true );
$html .= '<tr class="form-field">';
$html .= '<th scope="row" valign="top"><label for="catshort_button_type">Select Feature post:</label></th>';
$html .= '<td>';
$html .= '<select id="ex_product_cat_feature_post" name="ex_product_cat_feature_post[]" multiple="multiple" style="width:99%;max-width:25em;">';
if( $ex_product_cat_feature_post ) {
foreach( $ex_product_cat_feature_post as $post_id ) {
$title = get_the_title( $post_id );
// if the post title is too long, truncate it and add "..." at the end
$title = ( mb_strlen( $title ) > 50 ) ? mb_substr( $title, 0, 49 ) . '...' : $title;
$html .= '<option value="' . $post_id . '" selected="selected">' . $title . '</option>';
}
}
$html .= '</select>';
$html .= '</td>';
$html .= '</tr>';
echo $html;
//==========================================
?>
<script>
(function ($) {
'use strict';
$(function () {
//--------------------------------------------------------------------------
// multiple select with AJAX search
$('#ex_product_cat_feature_post').select2({
ajax: {
url: ajaxurl, // AJAX URL is predefined in WordPress admin
dataType: 'json',
delay: 250, // delay in ms while typing when to perform a AJAX search
data: function (params) {
return {
q: params.term, // search query
action: 'getpostsearch' // AJAX action for admin-ajax.php
};
},
processResults: function( data ) {
var options = [];
if ( data ) {
// data is the array of arrays, and each of them contains ID and the Label of the option
$.each( data, function( index, text ) { // do not forget that "index" is just auto incremented value
options.push( { id: text[0], text: text[1] } );
});
}
return {
results: options
};
},
cache: true
},
minimumInputLength: 3 // the minimum of symbols to input before perform a search
});
//----------------------------------------------------------------------------------------
});
})(jQuery);
</script>
<style type="text/css">
iframe#description_ifr{
min-height:220px !important;
}
</style>
<?php
}
add_action('product_cat_add_form_fields', 'ex_product_cat_feature_posts', 10, 1);
add_action('product_cat_edit_form_fields', 'ex_product_cat_feature_posts', 10, 1);
// Save extra taxonomy fields callback function.
function ex_product_cat_feature_posts_save($term_id) {
$ex_product_cat_feature_post = filter_input(INPUT_POST, 'ex_product_cat_feature_post');
update_term_meta($term_id, 'ex_product_cat_feature_post', $ex_product_cat_feature_post);
}
add_action('edited_product_cat', 'ex_product_cat_feature_posts_save', 10, 1);
add_action('create_product_cat', 'ex_product_cat_feature_posts_save', 10, 1);
回答1:
The main problem is when you save the data (last function). I have mainly revisited your 2 last functions, mostly last one:
// Adding Ajax Search for POSTS - wp_ajax_{action}
add_action( 'wp_ajax_getpostsearch', 'ex_get_posts_ajax_callback' );
function ex_get_posts_ajax_callback(){
$return = array(); // we will pass post IDs and titles to this array
// You can use WP_Query, query_posts() or get_posts() here - it doesn't matter
$search_results = new WP_Query( array(
's'=> $_GET['q'], // the search query
'post_type' => 'post',//post type
'post_status' => 'publish', // if you don't want drafts to be returned
'ignore_sticky_posts' => 1,
'posts_per_page' => 20 // how much to show at once
) );
if( $search_results->have_posts() ) :
while( $search_results->have_posts() ) : $search_results->the_post();
// shorten the title a little
$title = ( mb_strlen( $search_results->post->post_title ) > 50 ) ? mb_substr( $search_results->post->post_title, 0, 49 ) . '...' : $search_results->post->post_title;
$return[] = array( $search_results->post->ID, $title ); // array( Post ID, Post Title )
endwhile;
endif;
wp_send_json( $return );
}
// {$taxonomy}_add_form_fields
// HTML output for edit field
add_action('product_cat_add_form_fields', 'ex_product_cat_feature_posts', 10, 1);
add_action('product_cat_edit_form_fields', 'ex_product_cat_feature_posts', 10, 1);
function ex_product_cat_feature_posts( $taxonomy ) {
// Nonce field to validate form request came from current site
wp_nonce_field( basename( __FILE__ ), '_feature_post_nonce' );
$html = '<tr class="form-field">
<th scope="row" valign="top"><label for="catshort_button_type">Select Feature post:</label></th>
<td>
<select id="ex_product_cat_feature_post" name="ex_product_cat_feature_post[]" multiple="multiple" style="width:99%;max-width:25em;">';
$term_id = isset($_GET['tag_ID']) ? $_GET['tag_ID'] : '';
if( $feature_post_ids = get_term_meta( $term_id, 'ex_product_cat_feature_post', true ) ) {
foreach( $feature_post_ids as $post_id ) {
$title = get_the_title( $post_id );
// if the post title is too long, truncate it and add "..." at the end
$title = ( mb_strlen( $title ) > 50 ) ? mb_substr( $title, 0, 49 ) . '...' : $title;
$html .= '<option value="' . $post_id . '" selected="selected">' . $title . '</option>';
}
}
$html .= '</select></td></tr>';
// CSS Output
?><style type="text/css">iframe#description_ifr {min-height:220px !important;}</style><?php
// HTML Output
echo $html;
// jQuery Output
?><script>
// multiple select with AJAX search
jQuery(function($) {
$('#ex_product_cat_feature_post').select2({
ajax: {
url: ajaxurl, // AJAX URL is predefined in WordPress admin
dataType: 'json',
delay: 250, // delay in ms while typing when to perform a AJAX search
data: function (params) {
return {
q: params.term, // search query
action: 'getpostsearch' // AJAX action for admin-ajax.php
};
},
processResults: function( data ) {
var options = [];
if ( data ) {
// data is the array of arrays, and each of them contains ID and the Label of the option
$.each( data, function( index, text ) { // do not forget that "index" is just auto incremented value
options.push( { id: text[0], text: text[1] } );
});
}
return {
results: options
};
},
cache: true
},
minimumInputLength: 3 // the minimum of symbols to input before perform a search
});
});
</script>
<?php
}
// edited_{$taxonomy}
// Save extra taxonomy fields callback function.
add_action( 'edited_product_cat', 'ex_product_cat_feature_posts_save', 10, 2 );
add_action( 'create_product_cat', 'ex_product_cat_feature_posts_save', 10, 2 );
function ex_product_cat_feature_posts_save( $term_id, $term_taxonomy_id ) {
if( isset($_POST['ex_product_cat_feature_post']) && $feature_post_ids = $_POST['ex_product_cat_feature_post'] )
update_term_meta($term_id, 'ex_product_cat_feature_post', $_POST['ex_product_cat_feature_post']);
}
Code goes in function.php file of your active child theme (or active theme). Tested and works.
来源：https://stackoverflow.com/questions/55449709/add-a-multi-select-field-for-featured-posts-in-woocommerce-product-category-sett