我有一个显示随机引用的代码。一个人写了一个函数来实现所有这些。但由于某些原因，通过AJAX更新数据不起作用。当您按下“新报价”按钮时，没有任何反应。也许有人知道为什么？需要在以下代码中修复哪些内容，以便在单击“新引号”时加载新引号？
/wp-content/themes/%your_theme%/js/ajax-load-quote.php
<?php
/* uncomment the below, if you want to use native WP functions in this file */
// require_once('../../../../wp-load.php');
$array = file( $_POST['file_path'] ); // file path in $_POST, as from the js
$r = rand( 0, count($array) - 1 );
return '<p>' . $array[$r] . '</p>';
?>
在页面内容，窗口小部件或模板文件中：
<div id="randomquotes">
<p>I would rather have my ignorance than another man’s knowledge,
because I have so much more of it.<br />
-- Mark Twain, American author & Playwright</p>
</div>
<a id="newquote" class="button" href="#" title="Gimme a new one!">New Quote</a>
这显然可以根据自己的喜好进行调整，但为了这个例子，这就是我们的目标。
我们稍后会通过短代码生成上述代码。
/wp-content/themes/%your_theme%/js/ajax-load-quote.js
function ajaxQuote() {
var theQuote = jQuery.ajax({
type: 'POST',
url: ajaxParams.themeURI+'js/ajax-load-quote.php',
/* supplying the file path to the ajax loaded php as a $_POST variable */
data: { file_path: ajaxParams.filePath },
beforeSend: function() {
ajaxLoadingScreen(true,'#randomquotes');
},
success: function(data) {
jQuery('#randomquotes').find('p').remove();
jQuery('#randomquotes').prepend(data);
},
complete: function() {
ajaxLoadingScreen(false,'#randomquotes');
}
});
return theQuote;
}
/* Loading screen to be displayed during the process, optional */
function ajaxLoadingScreen(switchOn,element) {
/* show loading screen */
if (switchOn) {
jQuery(''+element).css({
'position': 'relative'
});
var appendHTML = '<div class="ajax-loading-screen appended">
<img src="'+ajaxParams.themeURI+'images/ajax-loader.gif"
alt="Loading ..." width="16" height="16" /></div>';
if( jQuery(''+element).children('.ajax-loading-screen').length === 0 ) {
jQuery(''+element).append(appendHTML);
}
jQuery(''+element).children('.ajax-loading-screen').first().css({
'display': 'block',
'visibility': 'visible',
'filter': 'alpha(opacity=100)',
'-ms-filter': '"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)"',
'opacity': '1'
});
} else {
/* hide the loading screen */
jQuery(''+element).children('.ajax-loading-screen').css({
'display': '',
'visibility': '',
'filter': '',
'-ms-filter': '',
'opacity': ''
});
jQuery(''+element).css({
'position': ''
});
}
}
/* triggering the above via the click event */
jQuery('#newquotes').click( function() {
var theQuote = ajaxQuote();
return false;
});
/wp-content/themes/%your_theme%/functions.php
function random_quote( $atts ) {
/* extracts the value of shortcode argument path */
extract( shortcode_atts( array(
'path' => get_template_directory_uri() . '/quotes.txt' // default, if not set
), $atts ) );
$array = file( $path );
$r = rand( 0, count($array) - 1 );
$output = '<div id="randomquotes">' .
'<p>' . $array[$r] . '</p>' .
'</div>' .
'<a id="newquote" class="button" href="#" title="Gimme a new one!">New Quote</a>';
/* enqueue the below registered script, if needed */
wp_enqueue_script( 'ajax-quote' );
/* supplying the file path to the script */
wp_localize_script(
'ajax-quote',
'ajaxParams',
array(
'filePath' => $path,
'themeURI' => get_template_directory_uri() . '/'
)
);
return $output;
}
add_shortcode( 'randomquotes', 'random_quote');
/* register the js */
function wpse72974_load_scripts() {
if ( ! is_admin() ) {
wp_register_script(
'ajax-quote',
get_template_directory_uri() . '/js/ajax-load-quote.js',
array( 'jquery' ),
'1.0',
true
);
}
}
add_action ( 'init', 'wpse72974_load_scripts' );
如何在WordPress中使用AJAX更新页面上的内容？
答案 0 :(得分：62)
好问题！
但是，当你的代码以错误的做法开始时 - require_once('wp-load.php'); - ，我决定选择一个我的工作片段并进行调整。
<强> 观察 ：
quotes.txt，此处的帖子类型用作源post），方法get_random_post #newpost-shortcode和#randomposts）<?php
/**
* Plugin Name: (SO) Ajax Shortcode
* Description: Demonstration of WordPress Ajax working as a shortcode.
* Plugin URI: http://stackoverflow.com/a/13614297/1287812
* Version: 2013.10.25
* Author: Rodolfo Buaiz
* Author URI: https://wordpress.stackexchange.com/users/12615/brasofilo
* License: GPLv3
*/
add_action(
'plugins_loaded',
array ( B5F_SO_13498959::get_instance(), 'plugin_setup' )
);
class B5F_SO_13498959
{
private $cpt = 'post'; # Adjust the CPT
protected static $instance = NULL;
public $plugin_url = '';
public function __construct() {}
public static function get_instance()
{
NULL === self::$instance and self::$instance = new self;
return self::$instance;
}
/**
* Regular plugin work
*/
public function plugin_setup()
{
$this->plugin_url = plugins_url( '/', __FILE__ );
add_shortcode( 'randomposts', array( $this, 'shortcode') );
add_action( 'wp_enqueue_scripts', array( $this, 'enqueue' ) );
add_action( 'wp_ajax_query_rand_post', array( $this, 'query_rand_post' ) );
add_action( 'wp_ajax_nopriv_query_rand_post', array( $this, 'query_rand_post' ) );
}
/**
* SHORTCODE output
*/
public function shortcode( $atts )
{
# First post
if( ! $random_post = $this->get_random_post() )
$random_post = __( 'Could not retrieve a post.' );
# Prepare output
$output = sprintf(
'<div id="randomposts">%s</div>
<button id="newpost-shortcode" type="button" title="%s">%s</button>',
$random_post,
__( 'Gimme a new one!' ),
__( 'New random post' )
);
return $output;
}
/**
* ACTION Enqueue scripts
*/
public function enqueue()
{
# jQuery will be loaded as a dependency
## DO NOT use other version than the one bundled with WP
### Things will BREAK if you do so
wp_enqueue_script(
'ajax-random-post',
"{$this->plugin_url}ajax.js",
array( 'jquery' )
);
# Here we send PHP values to JS
wp_localize_script(
'ajax-random-post',
'wp_ajax',
array(
'ajaxurl' => admin_url( 'admin-ajax.php' ),
'ajaxnonce' => wp_create_nonce( 'ajax_post_validation' ),
'loading' => 'http://i.stack.imgur.com/drgpu.gif'
)
);
}
/**
* AJAX query random post
*
* Check for security and send proper responses back
*/
public function query_rand_post()
{
check_ajax_referer( 'ajax_post_validation', 'security' );
$random_post = $this->get_random_post();
if( !isset( $random_post ) )
wp_send_json_error( array( 'error' => __( 'Could not retrieve a post.' ) ) );
else
wp_send_json_success( $random_post );
}
/**
* AUX FUNCTION
* Search a random Post Type and return the post_content
*/
public function get_random_post()
{
$array = get_posts(
array(
'post_type' => $this->cpt,
'numberposts' => -1
)
);
if( empty( $array ) )
return false;
# Select a random post index number from the current array
$r = rand( 0, count($array) - 1 );
return $array[$r]->post_content;
}
}
/*
* @plugin SO Ajax Shortcode
*/
jQuery( document ).ready( function( $ )
{
var data = {
action: 'query_rand_post',
security: wp_ajax.ajaxnonce
};
var image = '<img src="' + wp_ajax.loading + '" alt="Loading ..." width="16" height="16" />';
$( '#newpost-shortcode' ).click( function(e)
{
e.preventDefault();
$( '#randomposts' ).html( image );
$.post(
wp_ajax.ajaxurl,
data,
function( response )
{
// ERROR HANDLING
if( !response.success )
{
// No data came back, maybe a security error
if( !response.data )
$( '#randomposts' ).html( 'AJAX ERROR: no response' );
else
$( '#randomposts' ).html( response.data.error );
}
else
$( '#randomposts' ).html( response.data );
}
);
}); // end click
});
答案 1 :(得分：5)
此处示例插件作为问题的答案。在前端使用ajaxurl。
所谓的随机quotes.php
<?php
/*
Plugin Name: SO Random Quotes
Plugin URI: http://azzrael.ru
Description: Reference to http://stackoverflow.com/questions/13498959/how-to-use-ajax-in-a-wordpress-shortcode
Version: 1.0.0
Author: Azzrael
Author URI: http://azzrael.ru
*/
new SoRandomQuotes();
/**
* Class SoRandomQuotes
*/
class SoRandomQuotes{
const SHORTCODE_KEY = 'randomquotes'; // usage [randomquotes path='/path/to/file/another.quotes.csv']
const AJAX_ACTION = 'so_getnewquote'; // ajax action
const DOM_TARGET = 'randomquotes'; // dom element to put the quotes
/**
* SoRandomQuotes constructor.
* init actions
*/
function __construct() {
// adding shortcode
add_shortcode('randomquotes', array($this, 'addShortcode'));
// adding ajax callbacks
add_action( 'wp_ajax_'.self::AJAX_ACTION, array($this, 'getQuoteAjax')); // admin
add_action( 'wp_ajax_nopriv_'.self::AJAX_ACTION, array($this, 'getQuoteAjax')); // front
}
/**
* Shortcode callback
* @param $atts
* @return string
*/
public function addShortcode($atts){
// getting path value from shortcode atts
$got =shortcode_atts( array(
'path' => plugin_dir_path( __FILE__ ).'quotes.txt',
), $atts );
// shortcode replacement
$out = sprintf(
'<div id="%s">%s</div><a id="newquote" class="button" href="#" title="Gimme a new one!">New Quote</a>',
self::DOM_TARGET,
$this->getQuote($got['path'])
);
// loading js
// jquery depends
wp_enqueue_script('sorandquo-js', plugin_dir_url( __FILE__ ).'quote-loader.js', array('jquery'));
// passing to js needed vars
wp_localize_script( 'sorandquo-js', 'ajaxParams',
array(
'path' => $got['path'], // path to qoutes file
'targetDom' => '#'.self::DOM_TARGET, // dom path to put resulting qoute
'ajaxurl' => admin_url( 'admin-ajax.php'), // for frontend ( not admin )
'action' => self::AJAX_ACTION, //
)
);
// render shortcode replacement
return $out;
}
/**
* Ajax Callback
*/
public function getQuoteAjax(){
echo $this->getQuote($_POST['path']);
die();
}
/**
* Getting random Qoute from the file
* @param $path
* @return mixed
*/
public function getQuote($path){
$quotesFile = is_file($path) ? file_get_contents($path):"File {$path} not found";
$quotesArr = $quotesFile ? explode("\n", $quotesFile):['Quotes File is empty'];
return $quotesArr[array_rand($quotesArr)];
}
}
引号loader.js
jQuery.noConflict();
jQuery(document).ready(function($) {
$(document).on('click', '#newquote', function (e) {
e.preventDefault();
$.post(ajaxParams.ajaxurl, {
'action':ajaxParams.action,
'path' :ajaxParams.path
}, function (ret) {
$(ajaxParams.targetDom).html(ret);
}, 'html');
});
});
答案 2 :(得分：0)
Wordpress短代码与您提供参数的功能相同，
用于创建ajax请求，您可以在头文件或函数文件中使用jQuery.ajax或xmlhttp add_action wp_head hook。
你应该在你的主题文件夹中创建ajax.php，在文件的顶部你应该包含wp-load.php。并以适当的方式放置所有的ajax功能。
答案 3 :(得分：0)
触发器中使用的选择器与按钮ID不匹配。
将jQuery('#newquotes')更改为jQuery('#newquote')
答案 4 :(得分：-2)
在function.php中添加此功能：
<?php
add_action('wp_head','ajaxurl');
function ajaxurl()
{
?>
<script type="text/javascript">
var ajaxurl = '<?php echo admin_url('admin-ajax.php'); ?>';
</script>
<?php
}?>