scroll to element in horizontal div

    var $scroller = $('.scroller');
    // assign click handler
    $('button').on('click', function () {       
        // get the partial id of the div to scroll to
        var divIdx = $('input').val();          
        
        // retrieve the jquery ref to the div
        var scrollTo = $('#d'+divIdx)           
            // change its bg
            .css('background', '#9f3')          
            // retrieve its position relative to its parent
            .position().left;                   
        console.log(scrollTo);
        // simply update the scroll of the scroller
        // $('.scroller').scrollLeft(scrollTo); 
        // use an animation to scroll to the destination
        $scroller
          .animate({'scrollLeft': scrollTo}, 500);    
    });

    .scroller {
        width: 300px;
        height: 100px;
        overflow-x: auto;
        overflow-y: hidden;
    }
    .container {
        position: relative; /*important for the .position() method */
        height: 100px;
        width: 770px;
    }
    .container div {
        height: 90px;
        width: 60px;
        float: left;
        margin: 5px;
        background: #39f;
    }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="scroller">
        <div class="container">
            <div id="d1"></div>
            <div id="d2"></div>
            <div id="d3"></div>
            <div id="d4"></div>
            <div id="d5"></div>
            <div id="d6"></div>
            <div id="d7"></div>
           <!-- ... -->           
        </div>
    </div>
    <button>Scroll to: </button> <input type="text" value="4"/>