Validation for WordPress Default Comments

wp-comment-validation.js

jQuery(function ($) {
	/*Email validation function*/
	function isEmail(email) {
	  var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	  if( regex.test(email) ){
	  	return true;
	  } else {
	  	return false;
	  }
	}

	/*Blog Post comment validation - keeping post comment button disabled until everything satisfy*/
	if ( ! $('body.single-post .logged-in-as').length ) {
		/*Set Comment Submit Button disabled*/
		$('body.single-post #submit').attr('disabled', 'disabled');
		/*appending the required span fields to show notice*/
		if ( $('#commentform #author').val() == '' ) {
			$('.comment-form-author').append('<span id="nameNotice">Please enter your name</span>');
		}
		if ( $('#commentform #email').val() == '' ) {
			$('.comment-form-email').append('<span id="emailNotice">Please enter a valid email</span>');
		}
		$('.comment-form-comment').append('<span id="commentNotice">Comment must be at least 15 charecters long</span>');
		$('.form-submit').append('<p id="submitNotice">Please fill up the above form properly to enable the post comment button.</p>');

		$('#commentform').keyup(function() {
			/*Checking if name is provided*/
			if ( $('#commentform #author').val().replace(/ /g,'')  == '' ) {
				$('#nameNotice').text( 'Please enter your name' );
			} else {
				$('#nameNotice').text( '' );
			}
			/*Checking if email is provided*/
			if ( $('#commentform #email').val().replace(/ /g,'')  == '' ) {
				$('#emailNotice').text( 'Please enter a valid email' );
			} else if ( isEmail( $('#commentform #email').val().replace(/ /g,'') ) == false ) {
				$('#emailNotice').text( 'This is not a valid email' );
			} else {
				$('#emailNotice').text( '' );
			}
			/*Checking if comment is provided*/
			if ( $('#commentform #comment').val().replace(/ /g,'') == '' ) {
				$('#commentNotice').text( 'Comment must be at least 15 charecters long' );
			} else if ( $('#commentform #comment').val().replace(/ /g,'').length <= 14 ) {
				$('#commentNotice').text( ( 15 - ( $('#commentform #comment').val().replace(/ /g,'').length ) ) + ' more charecters to go ...' );
			} else {
				$('#commentNotice').text( '' );
			}
			
	        if ( ( $('#commentform #author').val().replace(/ /g,'')  != '' ) &&
	        	 ( $('#commentform #email').val().replace(/ /g,'') != '' ) &&
	        	 ( isEmail( $('#commentform #email').val().replace(/ /g,'') ) == true ) &&
	        	 ( $('#commentform #comment').val().replace(/ /g,'').length  > 14 ) 
	        	){

	        	$('body.single-post #submit').removeAttr('disabled');
	        	$('#submitNotice').text('');
	        } else {
	        	$('body.single-post #submit').attr('disabled', 'disabled');
	        	$('#submitNotice').text('Please fill up the above form properly to enable the post comment button.');
	        }
	    });
	}
});