add and load popper.js in child theme too

functions.php

@@ -17,5 +17,7 @@ function theme_enqueue_styles() {
 	$the_theme = wp_get_theme();
 
     wp_enqueue_style( 'child-understrap-styles', get_stylesheet_directory_uri() . '/css/child-theme.min.css', array(), $the_theme->get( 'Version' ) );
+    wp_enqueue_script( 'jquery' );
+	wp_enqueue_script( 'popper-scripts', get_template_directory_uri() . '/js/popper.min.js', array(), false);
     wp_enqueue_script( 'child-understrap-scripts', get_stylesheet_directory_uri() . '/js/child-theme.min.js', array(), $the_theme->get( 'Version' ), true );
 }

js/popper.js

@@ -1,6 +1,6 @@
 /**!
  * @fileOverview Kickass library to create and place poppers near their reference elements.
- * @version 1.11.1
+ * @version 1.12.1
  * @license
  * Copyright (c) 2016 Federico Zivolo and contributors
  *
@@ -873,6 +873,7 @@ function update() {
   var data = {
     instance: this,
     styles: {},
+    arrowStyles: {},
     attributes: {},
     flipped: false,
     offsets: {}
@@ -1117,9 +1118,9 @@ function applyStyle(data) {
   // they will be set as HTML attributes of the element
   setAttributes(data.instance.popper, data.attributes);
 
-  // if the arrow style has been computed, apply the arrow style
+  // if arrowElement is defined and arrowStyles has some properties
-  if (data.offsets.arrow) {
+  if (data.arrowElement && Object.keys(data.arrowStyles).length) {
-    setStyles(data.arrowElement, data.offsets.arrow);
+    setStyles(data.arrowElement, data.arrowStyles);
   }
 
   return data;
@@ -1239,9 +1240,10 @@ function computeStyle(data, options) {
     'x-placement': data.placement
   };
 
-  // Update attributes and styles of `data`
+  // Update `data` attributes, styles and arrowStyles
   data.attributes = _extends({}, attributes, data.attributes);
   data.styles = _extends({}, styles, data.styles);
+  data.arrowStyles = _extends({}, data.offsets.arrow, data.arrowStyles);
 
   return data;
 }
@@ -1314,13 +1316,15 @@ function arrow(data, options) {
   var isVertical = ['left', 'right'].indexOf(placement) !== -1;
 
   var len = isVertical ? 'height' : 'width';
-  var side = isVertical ? 'top' : 'left';
+  var sideCapitalized = isVertical ? 'Top' : 'Left';
+  var side = sideCapitalized.toLowerCase();
   var altSide = isVertical ? 'left' : 'top';
   var opSide = isVertical ? 'bottom' : 'right';
   var arrowElementSize = getOuterSizes(arrowElement)[len];
 
   //
-  // extends keepTogether behavior making sure the popper and its reference have enough pixels in conjuction
+  // extends keepTogether behavior making sure the popper and its
+  // reference have enough pixels in conjuction
   //
 
   // top/left side
@@ -1336,7 +1340,9 @@ function arrow(data, options) {
   var center = reference[side] + reference[len] / 2 - arrowElementSize / 2;
 
   // Compute the sideValue using the updated popper offsets
-  var sideValue = center - getClientRect(data.offsets.popper)[side];
+  // take popper margin in account because we don't have this info available
+  var popperMarginSide = getStyleComputedProperty(data.instance.popper, 'margin' + sideCapitalized).replace('px', '');
+  var sideValue = center - getClientRect(data.offsets.popper)[side] - popperMarginSide;
 
   // prevent arrowElement from being placed not contiguously to its popper
   sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);
@@ -1858,7 +1864,7 @@ function inner(data) {
 
   var subtractLength = ['top', 'left'].indexOf(basePlacement) === -1;
 
-  popper[isHoriz ? 'left' : 'top'] = reference[placement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);
+  popper[isHoriz ? 'left' : 'top'] = reference[basePlacement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);
 
   data.placement = getOppositePlacement(placement);
   data.offsets.popper = getClientRect(popper);
@@ -1936,6 +1942,9 @@ var modifiers = {
    * '10 - 5vh + 3%'
    * '-10px + 5vh, 5px - 6%'
    * ```
+   * > **NB**: If you desire to apply offsets to your poppers in a way that may make them overlap
+   * > with their reference element, unfortunately, you will have to disable the `flip` modifier.
+   * > More on this [reading this issue](https://github.com/FezVrasta/popper.js/issues/373)
    *
    * @memberof modifiers
    * @inner
@@ -2198,6 +2207,7 @@ var modifiers = {
  * @property {Boolean} data.hide True if the reference element is out of boundaries, useful to know when to hide the popper.
  * @property {HTMLElement} data.arrowElement Node used as arrow by arrow modifier
  * @property {Object} data.styles Any CSS property defined here will be applied to the popper, it expects the JavaScript nomenclature (eg. `marginBottom`)
+ * @property {Object} data.arrowStyles Any CSS property defined here will be applied to the popper arrow, it expects the JavaScript nomenclature (eg. `marginBottom`)
  * @property {Object} data.boundaries Offsets of the popper boundaries
  * @property {Object} data.offsets The measurements of popper, reference and arrow elements.
  * @property {Object} data.offsets.popper `top`, `left`, `width`, `height` values

package.json

@@ -1,6 +1,6 @@
 {
   "name": "understrap-child",
-  "version": "0.3.3.2",
+  "version": "0.3.4",
   "description": "Basic Child Theme for UnderStrap Theme Framework: https://github.com/holger1411/understrap",
   "main": "index.js",
   "scripts": {

style.css

@@ -5,7 +5,7 @@
  Author:       Holger Koenemann
  Author URI:   http://www.holgerkoenemann.de
  Template:     understrap
- Version:      0.3.3.2
+ Version:      0.3.4
  License: GNU General Public License v2 or later
  License URI: http://www.gnu.org/licenses/gpl-2.0.html
  Text Domain:  understrap-child