brancher/js/slider.js

// Call & init
$(document).ready(function(){
  $('.ba-slider').each(function(){
    var cur = $(this);
    // Adjust the slider
    var width = cur.width()+'px';
    cur.find('.resize img').css('width', width);
    // Bind dragging events
    drags(cur.find('.handle'), cur.find('.resize'), cur);
  });
  $('.extraSpace').each(function(){
    var cur = $(this);
    // Adjust the slider
    var width = cur.width()+'px';
    cur.find('.resize img').css('width', width);
    // Bind dragging events
    drags(cur.find('.handle'), cur.find('.resize'), cur);
  });
});


// Update sliders on resize.
// Because we all do this: i.imgur.com/YkbaV.gif
$(window).resize(function(){
  $('.ba-slider').each(function(){
    var cur = $(this);
    var width = cur.width()+'px';
    cur.find('.resize img').css('width', width);
  });
  $('.extraSpace').each(function(){
    var cur = $(this);
    var width = cur.width()+'px';
    cur.find('.resize img').css('width', width);
  });
});


function drags(dragElement, resizeElement, container) {

  // Initialize the dragging event on mousedown.
  dragElement.on('mousedown touchstart', function(e) {

    dragElement.addClass('draggable');
    resizeElement.addClass('resizable');

    // Check if it's a mouse or touch event and pass along the correct value
    var startX = (e.pageX) ? e.pageX : e.originalEvent.touches[0].pageX;

    // Get the initial position
    var dragWidth = dragElement.outerWidth(),
        posX = dragElement.offset().left + dragWidth - startX,
        containerOffset = container.offset().left,
        containerWidth = container.outerWidth();

    // Set limits
    minLeft = containerOffset + 10;
    maxLeft = containerOffset + containerWidth - dragWidth - 10;

    // Calculate the dragging distance on mousemove.
    dragElement.parents().on("mousemove touchmove", function(e) {

      // Check if it's a mouse or touch event and pass along the correct value
      var moveX = (e.pageX) ? e.pageX : e.originalEvent.touches[0].pageX;

      leftValue = moveX + posX - dragWidth;

      // Prevent going off limits
      if ( leftValue < minLeft) {
        leftValue = minLeft;
      } else if (leftValue > maxLeft) {
        leftValue = maxLeft;
      }

      // Translate the handle's left value to masked divs width.
      widthValue = (leftValue + dragWidth/2 - containerOffset)*100/containerWidth+'%';

      // Set the new values for the slider and the handle.
      // Bind mouseup events to stop dragging.
      $('.draggable').css('left', widthValue).on('mouseup touchend touchcancel', function () {
        $(this).removeClass('draggable');
        resizeElement.removeClass('resizable');
      });
      $('.resizable').css('width', widthValue);
    }).on('mouseup touchend touchcancel', function(){
      dragElement.removeClass('draggable');
      resizeElement.removeClass('resizable');
    });
    e.preventDefault();
  }).on('mouseup touchend touchcancel', function(e){
    dragElement.removeClass('draggable');
    resizeElement.removeClass('resizable');
  });
}