JavaScript: Center Block Grid Orphans

JavaScript: Center Block Grid Orphans.js

// Blog Grid Center Fix

function centerBlockGrid(listID){
    $window = $(window);
    var windowWidth = $window.width();
    var listWidth = $(listID).width();
    var smallGrid;
    var mediumGrid;
    var largeGrid;

    var gridClass = $(listID).attr('class');

    if(gridClass.indexOf('small-block-grid') >= 0) {
       smallGrid = $(listID).attr('class').match(/small-block-grid-([0-9]+)/)[1];
    }
    else {
        smallGrid = 1;
    }
    
    if(gridClass.indexOf('medium-block-grid') >= 0) {
       mediumGrid = $(listID).attr('class').match(/medium-block-grid-([0-9]+)/)[1];
    }
    else {
        mediumGrid = smallGrid;
    }

    if(gridClass.indexOf('large-block-grid') >= 0) {
       largeGrid = $(listID).attr('class').match(/large-block-grid-([0-9]+)/)[1];
    }
    else {
        largeGrid = mediumGrid;
    }
    
    var listCount = $(listID + ' li').length;
    var responsiveGrid;

    if (windowWidth <= 640) { responsiveGrid = smallGrid; }
    if (windowWidth > 640 && windowWidth <= 1024) { responsiveGrid = mediumGrid; }
    if (windowWidth > 1024) { responsiveGrid = largeGrid; }

    var blockWidth = listWidth / responsiveGrid;
    var listRemainder = listCount % responsiveGrid;
    var listMissing = responsiveGrid - listRemainder;
    var listPush = listMissing / 2;
    var marginFix = blockWidth * listPush;

    if (listRemainder > 0) {
        $(listID + ' li').css('margin-left','0');
        $(listID + ' li:nth-last-child(' + listRemainder + ')').css('margin-left',marginFix + 'px');
    } else {
        $(listID + ' li').css('margin-left','0');
    }
}

$(document).ready(function() {
    if($('#logos').length ) {
        centerBlockGrid('#logos');
    }
});

$(window).resize(function() {
    if($('#logos').length ) {
        centerBlockGrid('#logos');
    }
});