// Creates an attribute pseudo-selector allowing for wildcards
jQuery.expr.pseudos.attr = $.expr.createPseudo(function(arg) {
    var regexp = new RegExp(arg);
    return function(elem) {
        for(var i = 0; i < elem.attributes.length; i++) {
            var attr = elem.attributes[i];
            if(regexp.test(attr.name)) {
                return true;
            }
        }
        return false;
    };
});

// Correctly targets anchors accounting for fixed navbar

/**
  * Check a href for an anchor. If exists, and in document, scroll to it.
  * If href argument ommited, assumes context (this) is HTML Element,
  * which will be the case when invoked by jQuery after an event
  */
function scrollIfAnchor(href) {
    if (matchMedia('only screen and (min-width: 980px)').matches) {
        href = typeof(href) == "string" ? href : $(this).attr("href");

        // You could easily calculate this dynamically if you prefer
        var fromTop = 62;

        // If our Href points to a valid, non-empty anchor, and is on the same page (e.g. #foo)
        // Legacy jQuery and IE7 may have issues: http://stackoverflow.com/q/1593174
        // Also ensures the link clicked does not have a data attribute to avoid breaking
        // Bootstrap JS components. Checks if this is the window to allow scrolling on fresh
        // load despite window's data attribute.
        if(href.indexOf("#") == 0 && !$(this).is(":attr('^data-')")) {
            var $target = $(href);

            // Older browser without pushState might flicker here, as they momentarily
            // jump to the wrong position (IE < 10)
            if($target.length) {
                $('html, body').animate({ scrollTop: $target.offset().top - fromTop });
                if(history && "pushState" in history) {
                    history.pushState({}, document.title, window.location.pathname + href);
                    return false;
                }
            }
        }
    }
}

// Runs on page load
scrollIfAnchor(window.location.hash);

// Intercept all anchor clicks
$("body").on("click", "a", scrolIfAnchor);