Save the following javascrip file wpse54189-ajax-comments.js inside your plug-in folder – say plugins/plug-in-name/js (or if this must go your theme, in your theme folder).
/*
* jQuery autoResize (textarea auto-resizer)
* @copyright James Padolsey http://james.padolsey.com
* @version 1.04
*/
(function(a){a.fn.autoResize=function(j){var b=a.extend({onResize:function(){},animate:true,animateDuration:150,animateCallback:function(){},extraSpace:20,limit:1000},j);this.filter('textarea').each(function(){var c=a(this).css({resize:'none','overflow-y':'hidden'}),k=c.height(),f=(function(){var l=['height','width','lineHeight','textDecoration','letterSpacing'],h={};a.each(l,function(d,e){h[e]=c.css(e)});return c.clone().removeAttr('id').removeAttr('name').css({position:'absolute',top:0,left:-9999}).css(h).attr('tabIndex','-1').insertBefore(c)})(),i=null,g=function(){f.height(0).val(a(this).val()).scrollTop(10000);var d=Math.max(f.scrollTop(),k)+b.extraSpace,e=a(this).add(f);if(i===d){return}i=d;if(d>=b.limit){a(this).css('overflow-y','');return}b.onResize.call(this);b.animate&&c.css('display')==='block'?e.stop().animate({height:d},b.animateDuration,b.animateCallback):e.height(d)};c.unbind('.dynSiz').bind('keyup.dynSiz',g).bind('keydown.dynSiz',g).bind('change.dynSiz',g)});return this}})(jQuery);
/*
* Source: wp-comment-master WordPress Plugin
* URL: http://wordpress.org/extend/plugins/wp-comment-master/
* Author URI: http://yjlblog.com
* Version: 1.7
* Last Updated: 2011-6-6
*/
var $commentlist=jQuery('.commentlist');
var $respond=jQuery('#respond');
var $message=jQuery('<span class="yjl-mes"></span>').appendTo("#commentform");;
var $list=$commentlist.children();
var totalCom=$list.length;
var $textarea=$respond.find('#comment').attr('rows','8');
var currentPage=0,$number,numPerPage,totalPage,$reply;
//track a reply comment
jQuery('.comment-reply-link').live('click',function(){
$reply=true;
});
var $cancel=jQuery('#cancel-comment-reply-link').click(function(){
$reply=false;
});
/*
*if Ajax comment posting is enabled
*/
jQuery('#commentform').submit(function(){
jQuery.ajax({
beforeSend:function(xhr){
xhr.setRequestHeader("If-Modified-Since","0");
$message.empty().append('<img src="'+yjlSettings.gifUrl+'" alt="processing...">');
},
type:'post',
url:jQuery(this).attr('action'),
data:jQuery(this).serialize(),
dataType:'html',
error:function(xhr){
if(xhr.status==500){
$message.empty().append(xhr.responseText.split('<p>')[1].split('</p>')[0]);
}
else if(xhr.status=='timeout'){
$message.empty().append((yjlSettings.timeOut!=''?yjlSettings.timeOut:'Error:Server time out,try again!'));
}
else{
$message.empty().append((yjlSettings.fast!=''?yjlSettings.fast:'Please slow down,you are posting to fast!'));
}
},
success:function(data){
$message.empty().append((yjlSettings.thank!=''?yjlSettings.thank:'Thank you for your comment!'));
$newComList=jQuery(data).find('.commentlist');
if(totalCom>0){
if($reply)$cancel.trigger('click');
else {
if(yjlSettings.order=='desc')currentPage=0;
else { getTotal($newComList);currentPage=totalPage-1;}
}
if(yjlSettings.pagination=='disable' || yjlSettings.pagerPos=='after')
$commentlist.prev().replaceWith($newComList.prev());
else $commentlist.prev().prev().replaceWith($newComList.prev());
$commentlist.replaceWith($newComList);
}else{
if(yjlSettings.repForm=='disable')$newComList.prev().andSelf().insertBefore($respond);
else $newComList.prev().andSelf().insertAfter($respond);
}
$commentlist=$newComList;
if(yjlSettings.pagination!='disable')pagination();
$textarea.val('');
}
});//end of ajax
return false;
});//end of submit function
if(yjlSettings.autoGrow!='disable'){
$textarea.autoResize({
// On resize:
onResize : function() {
jQuery(this).css({opacity:0.8});
},
// After resize:
animateCallback : function() {
jQuery(this).css({opacity:1});
},
// Quite slow animation:
animateDuration : 300,
// More extra space:
extraSpace : 20
});
}
The above code uses a variable which stores the location of an ‘ajax’ loading image (see below). We need to give this variable the location of the image, which should be your plug-in folder, say plugins/plug-in-name/img, (or, again, if you must, your theme’s folder). We will use use wp_localise_script.
First though, we need register this script with WordPress, listing jquery as a dependency:
add_action('init','wpse54189_register_script');
function wpse54189_register_script(){
//Register script
wp_register_script( 'wpse54189_ajax_comment', plugin_dir_path(__FILE__ ).'js/wpse54189-ajax-comments.js',array('jquery'));
//Add global variable storing ajax image
wp_localize_script( 'wpse54189_ajax_comment', 'yjlSettings', array(
'gifUrl'=> plugin_dir_path(__FILE__ ).'img/ajax-loader.gif',
/* remove this line if you don't want the comment textbox's height
to increase with the size of comment. */
'autoGrow'=> 'enable'
));
}
Then when you wish to enqueue the file: wp_enqueue_script('wpse54189_ajax_comment') – this will automatically print the variables and ensure jquery is loaded before hand.
This can be placed inside template files, or for plug-ins, you can enqueue the script on a hook (for instance the comment_form_before hook):
add_action('comment_form_before','wpse54189_register_script'){
wp_enqueue_script('wpse54189_ajax_comment')
}
You can get a nice Ajax loading gif from here. Or simply use this:
All the JavaScript code was grabbed from wp-comment-master plugin (of course, I removed the unnecessary snippets — just kept what’s needed).