Bootstrap horizontal scrolling

One other way :

CSS:

#list .row {white-space:nowrap;}
#list .row > div {display:inline-block;float:none;}

Js for horizontal scrolling:

window.addEventListener('mousewheel', function(e){
    e.preventDefault();
    var step = -100;  
    if (e.wheelDelta < 0) {
      step *= -1;
    }
    var newPos = window.pageXOffset + step;
    $('body').scrollLeft(newPos);    
})

Bootply : https://www.bootply.com/pbenard/usmX12rxgP

It's okay to exceed 12 column units in a row. It causes the columns to wrap, but you can override the wrapping with flexbox.

Bootstrap 4 uses flexbox, and the utility classes to get a horizontal scrolling layout..

<div class="container-fluid">
    <div class="row flex-row flex-nowrap">
        <div class="col-3">
           ..
        </div>
        <div class="col-3">
           ..
        </div>
        <div class="col-3">
           ..
        </div>
        <div class="col-3">
           ..
        </div>
        <div class="col-3">
           ..
        </div>
        <div class="col-3">
           ..
        </div>
        <div class="col-3">
           ..
        </div>
        <div class="col-3">
           ..
        </div>
    </div>
</div>

Bootstrap 4 Demo: http://codeply.com/go/GoFQqQAFhN

Also see: Horizontally scrollable list of cards in Bootstrap

For Bootstrap 3, it would be done with some CSS for the flexbox.. .

row > .col-xs-3 {
    display:flex;
    flex: 0 0 25%;
    max-width: 25%
}

.flex-nowrap {
    -webkit-flex-wrap: nowrap!important;
    -ms-flex-wrap: nowrap!important;
    flex-wrap: nowrap!important;
}
.flex-row {
    display:flex;
    -webkit-box-orient: horizontal!important;
    -webkit-box-direction: normal!important;
    -webkit-flex-direction: row!important;
    -ms-flex-direction: row!important;
    flex-direction: row!important;
}

Bootstrap 3 Demo: http://codeply.com/go/P13J3LuBIM