Detect if two elements are colliding/overlapping

colliding.js

/**
 * Detects if two elements are colliding
 *
 * Credit goes to BC on Stack Overflow, cleaned up a little bit
 *
 * @link http://stackoverflow.com/questions/5419134/how-to-detect-if-two-divs-touch-with-jquery
 * @param $div1
 * @param $div2
 * @returns {boolean}
 */
var is_colliding = function( $div1, $div2 ) {
	// Div 1 data
	var d1_offset             = $div1.offset();
	var d1_height             = $div1.outerHeight( true );
	var d1_width              = $div1.outerWidth( true );
	var d1_distance_from_top  = d1_offset.top + d1_height;
	var d1_distance_from_left = d1_offset.left + d1_width;

	// Div 2 data
	var d2_offset             = $div2.offset();
	var d2_height             = $div2.outerHeight( true );
	var d2_width              = $div2.outerWidth( true );
	var d2_distance_from_top  = d2_offset.top + d2_height;
	var d2_distance_from_left = d2_offset.left + d2_width;

	var not_colliding = ( d1_distance_from_top < d2_offset.top || d1_offset.top > d2_distance_from_top || d1_distance_from_left < d2_offset.left || d1_offset.left > d2_distance_from_left );

	// Return whether it IS colliding
	return ! not_colliding;
};

can you help me? it gives me allways: d1_offset is undefined

Thank you for the amazing code, that you have spend your time on making, to help all future developers that might soon be the CEO of the biggest company in the new world.

This is great, Thank you so much

Thanks. More cleanup

let isColliding = function (div1, div2) {

    let d1Offset = div1.offset();
    let d1Height = div1.outerHeight(true);
    let d1Width = div1.outerWidth(true);
    let d1Top = d1Offset.top + d1Height;
    let d1Left = d1Offset.left + d1Width;

    let d2Offset = div2.offset();
    let d2Height = div2.outerHeight(true);
    let d2Width = div2.outerWidth(true);
    let d2Top = d2Offset.top + d2Height;
    let d2Left = d2Offset.left + d2Width;

    return !(d1Top < d2Offset.top || d1Offset.top > d2Top || d1Left < d2Offset.left || d1Offset.left > d2Left);
};