javascript - Scrolling Tabs in Bootstrap 4

Question

I am working on scrolling tab. Below is my code. I am facing problem that I am not able to click middle tabs. On right button click tabs scrolls move it gradually. What should I do to move tabs gradually? Please help

var hidWidth;
var scrollBarWidths = 40;

var widthOfList = function() {
    var itemsWidth = 0;
    $('.list a').each(function() {
        var itemWidth = $(this).outerWidth();
        itemsWidth += itemWidth;
    });
    return itemsWidth;
};

var widthOfHidden = function() {
    return (($('.wrapper').outerWidth()) - widthOfList() - getLeftPosi()) - scrollBarWidths;
};

var getLeftPosi = function() {
    return $('.list').position().left;
};

var reAdjust = function() {
    if (($('.wrapper').outerWidth()) < widthOfList()) {
        $('.scroller-right').show().css('display', 'flex');
    } else {
        $('.scroller-right').hide();
    }

    if (getLeftPosi() < 0) {
        $('.scroller-left').show().css('display', 'flex');
    } else {
        $('.item').animate({
            left: "-=" + getLeftPosi() + "px"
        }, 'slow');
        $('.scroller-left').hide();
    }
}

reAdjust();

$(window).on('resize', function(e) {
    reAdjust();
});

$('.scroller-right').click(function() {

    $('.scroller-left').fadeIn('slow');
    $('.scroller-right').fadeOut('slow');

    $('.list').animate({
        left: "+=" + widthOfHidden() + "px"
    }, 'slow', function() {

    });
});

$('.scroller-left').click(function() {

    $('.scroller-right').fadeIn('slow');
    $('.scroller-left').fadeOut('slow');

    $('.list').animate({
        left: "-=" + getLeftPosi() + "px"
    }, 'slow', function() {

    });
});

Fiddle http://jsfiddle.net/vedankita/2uswn4od/13

Help me to scroll slowly on button click so that I can click on ease tab. Thanks

Answer 1

You should incrementally move the tabs "width of hidden", but no more than wrapper width...

var widthOfHidden = function(){

    var ww = 0 - $('.wrapper').outerWidth();
    var hw = (($('.wrapper').outerWidth())-widthOfList()-getLeftPosi())-scrollBarWidths;

    if (ww>hw) {
        return ww;
    }
    else {
        return hw;
    }

};

var getLeftPosi = function(){

    var ww = 0 - $('.wrapper').outerWidth();
    var lp = $('.list').position().left;

    if (ww>lp) {
        return ww;
    }
    else {
        return lp;
    }
};

And then "readjust" after each movement to determine whether or not the scroll arrows still need to show...

$('.scroller-right').click(function() {

  $('.scroller-left').fadeIn('slow');
  $('.scroller-right').fadeOut('slow');

  $('.list').animate({left:"+="+widthOfHidden()+"px"},'slow',function(){
    reAdjust();
  });
});

$('.scroller-left').click(function() {

    $('.scroller-right').fadeIn('slow');
    $('.scroller-left').fadeOut('slow');

    $('.list').animate({left:"-="+getLeftPosi()+"px"},'slow',function(){
        reAdjust();
    });
}); 

Demo: https://www.codeply.com/go/Loo3CqsA7T

---

Also, you can improve the position of the last tab by making sure it's right position is never less than wrapper width to keep it aligned to the right edge...

var widthOfHidden = function(){

    var ww = 0 - $('.wrapper').outerWidth();
    var hw = (($('.wrapper').outerWidth())-widthOfList()-getLeftPosi())-scrollBarWidths;
    var rp = $(document).width() - ($('.nav-item.nav-link').last().offset().left + $('.nav-item.nav-link').last().outerWidth());

    if (ww>hw) {
        return (rp>ww?rp:ww);
    }
    else {
        return (rp>hw?rp:hw);
    }
};