Simple snipet to add smooth scroll to href's target

smooth_scroll_down_jquery.js

$(document).ready(function () {
    $('a[href*="#"]')
        .not('[href="#"]')
        .click(function (e) {
            if (
                location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '')
                &&
                location.hostname == this.hostname
            ) {
                var target = $(this.hash)
                target = target.length ? target : $('[name=' + this.hash.slice(1) + ']')
                if (target.length) {
                    e.preventDefault()
                    $('html, body').animate({
                        scrollTop: target.offset().top
                    }, 1000, function () {
                        var $target = $(target)
                        $target.focus()
                        if ($target.is(":focus")) {
                            return false
                        } else {
                            $target.attr('tabindex', '-1')
                            $target.focus()
                        }
                    })
                }
            }
        })
})