materialKit methods plus LaunchModalNewsLetterForm() method

AdditionalClientFunctionality.js

		$( '#pol-newsletter-form > a' ).on( 'click', function()
		{
			var error = false, $nl_email = $( '#pol-newsletter-input' );

		 	if ( $nl_email.prop( 'name' ) !== "nlemail" || $nl_email.val().match( /^[\w-\._\+%]+@(?:[\w-]+\.)+[\w]{2,6}$/i ) === null )
		 	{
		 		$nl_email.tooltip( 'show' );

		 		$nl_email.on( 'click', function()
		 		{
		 			$nl_email.tooltip( 'hide' );
		 		});

				error = true;
		 	}
		 	else if ( error === false )
		 	{
				$.post( '<?php get_theme_url(); ?>/nwemail.php?job=subscribe', $( '#pol-newsletter-form' ).serialize(), function( data, status )
				{
					var DataObj = JSON.parse( data );

					if ( DataObj.error === "success" )
					{
						$nl_email.on( 'hidden.bs.tooltip', function()
						{
							$('#ModalNewsletter' ).modal( 'hide' );
							$nl_email.off( 'hidden.bs.tooltip' );
						});

						$nl_email.attr( 'title', 'Thanks for Subscribing!' ).tooltip( 'fixTitle' ).tooltip( 'show' );

					    setTimeout( function()
					    {
					    	$nl_email.tooltip( 'hide' );

					    }, 2000 );
					}
				});
		 	}
		});

backend.php

<?php
	# CWD
	# newsletter email processor

	$to 		= '[email protected]';
	
	@$job		= @$_GET[ 'job' ];
	@$email 	= $_POST[ 'nlemail' ];

	$error_arr 	= [];

	if ( $job == "" || $job !== "subscribe" )
	{
		$error_arr[ "error" ] = "jobless";
		echo json_encode( $error_arr );
	}
	else if ( isInjected( $email ) )
	{
		$error_arr[ "error" ] = "injected";
		echo json_encode( $error_arr );
	}
	else if ( !preg_match( '/^[\w-\._\+%]+@(?:[\w-]+\.)+[\w]{2,6}$/i', $email ) ) // validate format
	{
		$error_arr[ "error" ] = "invalid";
		echo json_encode( $error_arr );
	}		
	else
	{
		# process

		$headers 	= 	'MIME-Version: 1.0' . "\r\n";
		$headers	.=	'Content-type: text/html; charset=iso-8859-1' . "\r\n";

		// Additional headers
		// $headers .= 'To: Mary <[email protected]>, Kelly <[email protected]>' . "\r\n";
		
		$headers	.= 	'From: New Account <' . $email . '>' . "\r\n";


		$subject	= 	'New Newsletter Subscription!'; 
		$message	= 	"You've recieved a new subscription from: $email";

		//$headers .= 'Cc: [email protected]' . "\r\n";
		//$headers .= 'Bcc: [email protected]' . "\r\n";

		// Mail it
		$success = mail( $to, $subject, $message, $headers );

		if ( $success )
		{
			$error_arr[ "error" ] = "success";
			echo json_encode( $error_arr );
		}
		else
		{
			$error_arr[ "error" ] = "failed";
			echo json_encode( $error_arr );
		}
	}


	// injection check
	function isInjected( $str )
	{
		$injections = array
		(
			'(&)',
			'(\n+)',
			'(\r+)',
			'(\t+)',
			'(%0A+)',
			'(%0D+)',
			'(%08+)',
			'(%09+)'
		);

		return preg_match( '/' . join( '|', $injections ) . '/is', $str );
	}


?>

materialKit methods.js

materialKit = {
    misc:{
        navbar_menu_visible: 0
    },

    LaunchModalNewsLetterForm: function( delay = 1000, ckStat = true )
    {
        // adding the email join popup
        if ( document.cookie.indexOf( "shown=" + ckStat ) < 0 )
        {
            var show = function()
            {
                    $( '#ModalNewsletter' ).modal( 'show' );
            };

            $( window ).load( function()
            {
                var timer = window.setTimeout( show, delay );
            });
        }

        document.cookie = "shown=true; expires=Fri, 31 Dec 9999 23:59:59 GMT; path=/";

    },

    checkScrollForTransparentNavbar: debounce( function()
    {
            if( $( document ).scrollTop() > 260 )
            {
                if( transparent )
                {
                    transparent = false;
                    $( '.navbar-color-on-scroll' ).removeClass( 'navbar-transparent' );
                    $( '#pol-nav-svg' ).animate( { width: "110px", padding: "5px" }, 300 );                    
                }
            } else {
                    
                    $( '#pol-nav-svg' ).animate( { width: "145px", padding: "10px" }, 300 ); 

                if( !transparent ) {
                    transparent = true;
                    $( '.navbar-color-on-scroll' ).addClass( 'navbar-transparent' );                   
                }
            }
    }, 17 ),

    initSliders: function(){
        // Sliders for demo purpose
        $('#sliderRegular').noUiSlider({
            start: 40,
            connect: "lower",
            range: {
                min: 0,
                max: 100
            }
        });

        $('#sliderDouble').noUiSlider({
            start: [20, 60] ,
            connect: true,
            range: {
                min: 0,
                max: 100
            }
        });
    }
}