diff --git a/README.md b/README.md
index 98cb6c5..262566e 100644
--- a/README.md
+++ b/README.md
@@ -106,6 +106,9 @@ Executed before the menu begins to close
 - `onClose` (`callback`):
 Executed as soon as the menu has closed
 
+- `onDrag` (`callback`):
+Executed as the menu is being dragged; returns percentage completion
+
 # Methods
 
 - `OSREC.superslide.open()`
diff --git a/package.json b/package.json
index a7250e8..f28fafb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "superslide.js",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "A lightweight, slick sliding menu for your next PWA by OSREC Technologies (https://osrec.co.uk)",
   "main": "superslide-std.js",
   "scripts": {
diff --git a/superslide-std.js b/superslide-std.js
index 4e3f7a3..c6645c2 100755
--- a/superslide-std.js
+++ b/superslide-std.js
@@ -37,6 +37,7 @@ OSREC.superslide = function (p) {
 	me.p.onOpen = typeof me.p.onOpen == 'function' ? me.p.onOpen : function () {};
 	me.p.beforeClose = typeof me.p.beforeClose == 'function' ? me.p.beforeClose : function () {};
 	me.p.onClose = typeof me.p.onClose == 'function' ? me.p.onClose : function () {};
+	me.p.onDrag = typeof me.p.onDrag == 'function' ? me.p.onDrag : function () {};
 
 	me.body = document;
 	me.p.isOpen = false;
@@ -98,22 +99,34 @@ OSREC.superslide = function (p) {
 					me.p.content.style.transition = 'none';
 					me.p.slider.style.transition = 'none';
 
-					var sliderStartPosition = me.p.isOpen ? me.p.slider.offsetWidth : 0;
+					var sliderOffsetWidth = me.p.slider.offsetWidth;
+					var sliderStartPosition = me.p.isOpen ? sliderOffsetWidth : 0;
 					var translation = 0;
 					var delta = 0;
+					var completion = 0;
 
 					var touchMoveFunction = function (e) {
 
 						delta = e.changedTouches[0].clientX - startX;
 						translation = sliderStartPosition + delta;
 
-						if (translation > me.p.slider.offsetWidth) {
-							translation = me.p.slider.offsetWidth;
+						if (translation > sliderOffsetWidth) {
+							translation = sliderOffsetWidth;
 						}
 						if (translation < 0) {
 							translation = 0;
 						}
 
+						if (delta >= sliderOffsetWidth) {
+							completion = 1;
+						} else if (delta <= 0) {
+							completion = 0;
+						} else {
+							completion = delta / sliderOffsetWidth;
+						}
+
+						me.p.onDrag(completion);
+
 						me.p.slider.style.transform = `translate3d(${translation}px, 0, 0)`;
 						if (me.p.slideContent) {
 							me.p.content.style.transform = me.p.slider.style.transform;
@@ -164,22 +177,34 @@ OSREC.superslide = function (p) {
 					me.p.content.style.transition = 'none';
 					me.p.slider.style.transition = 'none';
 
-					var sliderStartPosition = me.p.isOpen ? -me.p.slider.offsetWidth : 0;
+					var sliderOffsetWidth = me.p.slider.offsetWidth;
+					var sliderStartPosition = me.p.isOpen ? -sliderOffsetWidth : 0;
 					var translation = 0;
 					var delta = 0;
+					var completion = 0;
 
 					var touchMoveFunction = function (e) {
 
 						delta = e.changedTouches[0].clientX - startX;
 						translation = sliderStartPosition + delta;
 
-						if (translation < -me.p.slider.offsetWidth) {
-							translation = -me.p.slider.offsetWidth;
+						if (translation < -sliderOffsetWidth) {
+							translation = -sliderOffsetWidth;
 						}
 						if (translation > 0) {
 							translation = 0;
 						}
 
+						if ((delta * -1) >= sliderOffsetWidth) {
+							completion = 1;
+						} else if ((delta * -1) <= 0) {
+							completion = 0;
+						} else {
+							completion = (delta * -1) / sliderOffsetWidth;
+						}
+
+						me.p.onDrag(completion);
+
 						me.p.slider.style.transform = `translate3d(${translation}px, 0, 0)`;
 						if (me.p.slideContent) {
 							me.p.content.style.transform = me.p.slider.style.transform;
@@ -401,4 +426,4 @@ if (hasDefine) {
 	// Assign to the global object
 	// This makes sure that the object really is assigned to the global scope
 	root.OSREC = OSREC;
-}
\ No newline at end of file
+}
diff --git a/superslide-std.min.js b/superslide-std.min.js
index 1e76562..b363abb 100644
--- a/superslide-std.min.js
+++ b/superslide-std.min.js
@@ -1 +1 @@
-"use strict";var OSREC=OSREC||{};OSREC.superslide=function(e){var t=this;t.p=e,t.p.animation=t.p.animation||"slideLeft",t.p.duration=t.p.duration||.5,t.p.allowDrag=void 0===t.p.allowDrag||t.p.allowDrag,t.p.slideContent=void 0===t.p.slideContent||t.p.slideContent,t.p.allowContentInteraction=void 0!==t.p.allowContentInteraction&&t.p.allowContentInteraction,t.p.closeOnBlur=void 0!==t.p.closeOnBlur&&t.p.closeOnBlur,t.p.width=t.p.width||"70vw",t.p.height=t.p.height||"100px",t.p.dragThreshold=t.p.dragThreshold||70,t.p.openThreshold=t.p.openThreshold||70,t.p.closeThreshold=t.p.closeThreshold||20,t.p.beforeOpen="function"==typeof t.p.beforeOpen?t.p.beforeOpen:function(){},t.p.onOpen="function"==typeof t.p.onOpen?t.p.onOpen:function(){},t.p.beforeClose="function"==typeof t.p.beforeClose?t.p.beforeClose:function(){},t.p.onClose="function"==typeof t.p.onClose?t.p.onClose:function(){},t.body=document,t.p.isOpen=!1;t.p.cssTransitionEndEvent=function(){var e,t=document.createElement("dummy"),n={transition:"transitionend",OTransition:"oTransitionEnd",MozTransition:"transitionend",WebkitTransition:"webkitTransitionEnd"};for(e in n)if(void 0!==t.style[e])return n[e]}(),function(){function e(e,t){t=t||{bubbles:!1,cancelable:!1,detail:void 0};var n=document.createEvent("CustomEvent");return n.initCustomEvent(e,t.bubbles,t.cancelable,t.detail),n}e.prototype=window.Event.prototype,window.CustomEvent=e}();var n=Math.max(document.documentElement.clientWidth,window.innerWidth||0);Math.max(document.documentElement.clientHeight,window.innerHeight||0);switch(t.p.sliderTransformClose="",t.p.contentTransformClose="",t.p.animation){case"slideLeft":t.p.slider.style.cssText=`position: fixed; overflow-y: auto; -webkit-overflow-scrolling: touch; width: ${t.p.width}; height: 100%; top: 0px; left: -${t.p.width};`,t.p.slider.style.transition=`${t.p.duration}s`,t.p.sliderTransform=`translate3d(${t.p.width},0,0)`,t.p.slider.parentNode.style.overflowX="hidden",t.p.contentTransform=`translate3d(${t.p.width},0,0)`,t.p.touchStartFunction=function(e){var n=e.changedTouches[0].clientX;if(t.p.isOpen||!(n>t.p.dragThreshold)){t.p.content.style.transition="none",t.p.slider.style.transition="none";var o=t.p.isOpen?t.p.slider.offsetWidth:0,i=0,s=0,r=function(e){s=e.changedTouches[0].clientX-n,(i=o+s)>t.p.slider.offsetWidth&&(i=t.p.slider.offsetWidth),i<0&&(i=0),t.p.slider.style.transform=`translate3d(${i}px, 0, 0)`,t.p.slideContent&&(t.p.content.style.transform=t.p.slider.style.transform),t.p.slider.style.opacity=.999},p=function(e){t.body.removeEventListener("touchmove",r),t.p.slider.style.transition=`${t.p.duration}s`,t.p.slideContent&&(t.p.content.style.transition=`${t.p.duration}s`),!t.p.isOpen&&s>=t.p.openThreshold?t.open(!0):t.p.isOpen&&s<-t.p.closeThreshold?t.close(!0):t.p.isOpen?t.open(!0):t.close(!0),t.body.removeEventListener("touchend",p)};t.body.addEventListener("touchend",p),t.body.addEventListener("touchmove",r)}};break;case"slideRight":t.p.slider.style.cssText=`position: fixed; overflow-y: auto; -webkit-overflow-scrolling: touch; width: ${t.p.width}; height: 100%; top: 0px; left: 100%;`,t.p.slider.style.transition=`${t.p.duration}s`,t.p.sliderTransform=`translate3d(-${t.p.width},0,0)`,t.p.slider.parentNode.style.overflowX="hidden",t.p.contentTransform=`translate3d(-${t.p.width},0,0)`,t.p.touchStartFunction=function(e){var o=e.changedTouches[0].clientX;if(t.p.isOpen||!(o<n-t.p.dragThreshold)){t.p.content.style.transition="none",t.p.slider.style.transition="none";var i=t.p.isOpen?-t.p.slider.offsetWidth:0,s=0,r=0,p=function(e){r=e.changedTouches[0].clientX-o,(s=i+r)<-t.p.slider.offsetWidth&&(s=-t.p.slider.offsetWidth),s>0&&(s=0),t.p.slider.style.transform=`translate3d(${s}px, 0, 0)`,t.p.slideContent&&(t.p.content.style.transform=t.p.slider.style.transform),t.p.slider.style.opacity=.999},l=function(e){t.body.removeEventListener("touchmove",p),t.p.slider.style.transition=`${t.p.duration}s`,t.p.slideContent&&(t.p.content.style.transition=`${t.p.duration}s`),!t.p.isOpen&&r<=-t.p.openThreshold?t.open(!0):t.p.isOpen&&r>t.p.closeThreshold?t.close(!0):t.p.isOpen?t.open(!0):t.close(!0),t.body.removeEventListener("touchend",l)};t.body.addEventListener("touchend",l),t.body.addEventListener("touchmove",p)}};break;case"slideTop":t.p.slider.style.cssText=`position: fixed; overflow-x: auto; -webkit-overflow-scrolling: touch; width: 100%; height: ${t.p.height}; top: -${t.p.height}; left: 0;`,t.p.slider.style.transition=`${t.p.duration}s`,t.p.sliderTransform=`translate3d(0,${t.p.height},0)`,t.p.contentTransform=`translate3d(0,${t.p.height},0)`,t.p.allowDrag=!1,t.p.touchStartFunction=function(e){};break;case"slideBottom":t.p.slider.style.cssText=`position: fixed; overflow-x: auto; -webkit-overflow-scrolling: touch; width: 100%; height: ${t.p.height}; top: 100vh; left: 0;`,t.p.slider.style.transition=`${t.p.duration}s`,t.p.sliderTransform=`translate3d(0,-${t.p.height},0)`,t.p.slider.parentNode.style.overflowX="hidden",t.p.contentTransform=`translate3d(0,-${t.p.height},0)`,t.p.allowDrag=!1}return t.p.closeOnBlurFunction=function(e){e.preventDefault(),t.close.call(t)},t.p.slideContent&&(t.p.content.style.transition=`${t.p.duration}s`),t.p.allowDrag&&t.body.addEventListener("touchstart",t.p.touchStartFunction),t.p.allowContentInteraction?t.p.contentTouchStartFunction=function(e){}:t.p.contentTouchStartFunction=function(e){e.preventDefault()},t.p.slider.offsetHeight,t.p.slider.style.transition=`${t.p.duration}s`,t.p.content.style["-webkit-tap-highlight-color"]="transparent",t},OSREC.superslide.prototype.open=function(e){var t=this;return!e&&t.p.isOpen?Promise.resolve():new Promise(function(e,n){var o=function(n){(n.target||n.srcElement||n.originalTarget)==t.p.slider&&(t.p.onOpen(),t.p.isOpen=!0,t.p.slider.removeEventListener(t.p.cssTransitionEndEvent,o),t.p.content.addEventListener("touchstart",t.p.contentTouchStartFunction),t.p.closeOnBlur&&(t.body.removeEventListener("touchstart",t.p.touchStartFunction),t.p.content.addEventListener("touchstart",t.p.closeOnBlurFunction),t.p.content.addEventListener("click",t.p.closeOnBlurFunction)),e())};t.p.beforeOpen(),t.p.slider.addEventListener(t.p.cssTransitionEndEvent,o),t.p.slider.style.transform=t.p.sliderTransform,t.p.slider.style.opacity=1,t.p.slideContent&&(t.p.content.style.transform=t.p.contentTransform)})},OSREC.superslide.prototype.close=function(e){var t=this;return e||t.p.isOpen?new Promise(function(e,n){var o=function(n){(n.target||n.srcElement||n.originalTarget)==t.p.slider&&(t.p.onClose(),t.p.isOpen=!1,t.p.slider.removeEventListener(t.p.cssTransitionEndEvent,o),t.p.content.removeEventListener("touchstart",t.p.contentTouchStartFunction),t.p.closeOnBlur&&(t.body.addEventListener("touchstart",t.p.touchStartFunction),t.p.content.removeEventListener("touchstart",t.p.closeOnBlurFunction),t.p.content.removeEventListener("click",t.p.closeOnBlurFunction)),e())};t.p.beforeClose(),t.p.slider.addEventListener(t.p.cssTransitionEndEvent,o),t.p.slider.style.transform=t.p.sliderTransformClose,t.p.slider.style.opacity=1,t.p.slideContent&&(t.p.content.style.transform=t.p.contentTransformClose)}):Promise.resolve()},OSREC.superslide.prototype.toggle=function(){return this.p.isOpen?(console.log("close"),this.close()):(console.log("open"),this.open())},OSREC.superslide.prototype.isOpen=function(){return this.p.isOpen},OSREC.superslide.prototype.ready=function(){return this.p.readyPromise},OSREC.superslide.prototype.destroy=function(){var e=this;this.close().then(function(){e.body.removeEventListener("touchstart",e.p.touchStartFunction),e.body=null,e.p.content.removeEventListener("touchstart",e.p.closeOnBlurFunction),e.p.content.removeEventListener("click",e.p.closeOnBlurFunction),e.p.content=null,e.p.slider=null,e.p=null})};var hasDefine="function"==typeof define,hasExports="undefined"!=typeof module&&module.exports,root="undefined"==typeof window?global:window;hasDefine?define([],function(){return OSREC.superslide}):hasExports?module.exports=OSREC.superslide:root.OSREC=OSREC;
\ No newline at end of file
+"use strict";var OSREC=OSREC||{};OSREC.superslide=function(e){var t=this;t.p=e,t.p.animation=t.p.animation||"slideLeft",t.p.duration=t.p.duration||.5,t.p.allowDrag=void 0===t.p.allowDrag||t.p.allowDrag,t.p.slideContent=void 0===t.p.slideContent||t.p.slideContent,t.p.allowContentInteraction=void 0!==t.p.allowContentInteraction&&t.p.allowContentInteraction,t.p.closeOnBlur=void 0!==t.p.closeOnBlur&&t.p.closeOnBlur,t.p.width=t.p.width||"70vw",t.p.height=t.p.height||"100px",t.p.dragThreshold=t.p.dragThreshold||70,t.p.openThreshold=t.p.openThreshold||70,t.p.closeThreshold=t.p.closeThreshold||20,t.p.beforeOpen="function"==typeof t.p.beforeOpen?t.p.beforeOpen:function(){},t.p.onOpen="function"==typeof t.p.onOpen?t.p.onOpen:function(){},t.p.beforeClose="function"==typeof t.p.beforeClose?t.p.beforeClose:function(){},t.p.onClose="function"==typeof t.p.onClose?t.p.onClose:function(){},t.p.onDrag="function"==typeof t.p.onDrag?t.p.onDrag:function(){},t.body=document,t.p.isOpen=!1;t.p.cssTransitionEndEvent=function(){var e,t=document.createElement("dummy"),n={transition:"transitionend",OTransition:"oTransitionEnd",MozTransition:"transitionend",WebkitTransition:"webkitTransitionEnd"};for(e in n)if(void 0!==t.style[e])return n[e]}(),function(){function e(e,t){t=t||{bubbles:!1,cancelable:!1,detail:void 0};var n=document.createEvent("CustomEvent");return n.initCustomEvent(e,t.bubbles,t.cancelable,t.detail),n}e.prototype=window.Event.prototype,window.CustomEvent=e}();var n=Math.max(document.documentElement.clientWidth,window.innerWidth||0);Math.max(document.documentElement.clientHeight,window.innerHeight||0);switch(t.p.sliderTransformClose="",t.p.contentTransformClose="",t.p.animation){case"slideLeft":t.p.slider.style.cssText=`position: fixed; overflow-y: auto; -webkit-overflow-scrolling: touch; width: ${t.p.width}; height: 100%; top: 0px; left: -${t.p.width};`,t.p.slider.style.transition=`${t.p.duration}s`,t.p.sliderTransform=`translate3d(${t.p.width},0,0)`,t.p.slider.parentNode.style.overflowX="hidden",t.p.contentTransform=`translate3d(${t.p.width},0,0)`,t.p.touchStartFunction=function(e){var n=e.changedTouches[0].clientX;if(t.p.isOpen||!(n>t.p.dragThreshold)){t.p.content.style.transition="none",t.p.slider.style.transition="none";var o=t.p.slider.offsetWidth,i=t.p.isOpen?o:0,s=0,r=0,p=0,l=function(e){r=e.changedTouches[0].clientX-n,(s=i+r)>o&&(s=o),s<0&&(s=0),p=r>=o?1:r<=0?0:r/o,t.p.onDrag(p),t.p.slider.style.transform=`translate3d(${s}px, 0, 0)`,t.p.slideContent&&(t.p.content.style.transform=t.p.slider.style.transform),t.p.slider.style.opacity=.999},d=function(e){t.body.removeEventListener("touchmove",l),t.p.slider.style.transition=`${t.p.duration}s`,t.p.slideContent&&(t.p.content.style.transition=`${t.p.duration}s`),!t.p.isOpen&&r>=t.p.openThreshold?t.open(!0):t.p.isOpen&&r<-t.p.closeThreshold?t.close(!0):t.p.isOpen?t.open(!0):t.close(!0),t.body.removeEventListener("touchend",d)};t.body.addEventListener("touchend",d),t.body.addEventListener("touchmove",l)}};break;case"slideRight":t.p.slider.style.cssText=`position: fixed; overflow-y: auto; -webkit-overflow-scrolling: touch; width: ${t.p.width}; height: 100%; top: 0px; left: 100%;`,t.p.slider.style.transition=`${t.p.duration}s`,t.p.sliderTransform=`translate3d(-${t.p.width},0,0)`,t.p.slider.parentNode.style.overflowX="hidden",t.p.contentTransform=`translate3d(-${t.p.width},0,0)`,t.p.touchStartFunction=function(e){var o=e.changedTouches[0].clientX;if(t.p.isOpen||!(o<n-t.p.dragThreshold)){t.p.content.style.transition="none",t.p.slider.style.transition="none";var i=t.p.slider.offsetWidth,s=t.p.isOpen?-i:0,r=0,p=0,l=0,d=function(e){p=e.changedTouches[0].clientX-o,(r=s+p)<-i&&(r=-i),r>0&&(r=0),l=-1*p>=i?1:-1*p<=0?0:-1*p/i,t.p.onDrag(l),t.p.slider.style.transform=`translate3d(${r}px, 0, 0)`,t.p.slideContent&&(t.p.content.style.transform=t.p.slider.style.transform),t.p.slider.style.opacity=.999},a=function(e){t.body.removeEventListener("touchmove",d),t.p.slider.style.transition=`${t.p.duration}s`,t.p.slideContent&&(t.p.content.style.transition=`${t.p.duration}s`),!t.p.isOpen&&p<=-t.p.openThreshold?t.open(!0):t.p.isOpen&&p>t.p.closeThreshold?t.close(!0):t.p.isOpen?t.open(!0):t.close(!0),t.body.removeEventListener("touchend",a)};t.body.addEventListener("touchend",a),t.body.addEventListener("touchmove",d)}};break;case"slideTop":t.p.slider.style.cssText=`position: fixed; overflow-x: auto; -webkit-overflow-scrolling: touch; width: 100%; height: ${t.p.height}; top: -${t.p.height}; left: 0;`,t.p.slider.style.transition=`${t.p.duration}s`,t.p.sliderTransform=`translate3d(0,${t.p.height},0)`,t.p.contentTransform=`translate3d(0,${t.p.height},0)`,t.p.allowDrag=!1,t.p.touchStartFunction=function(e){};break;case"slideBottom":t.p.slider.style.cssText=`position: fixed; overflow-x: auto; -webkit-overflow-scrolling: touch; width: 100%; height: ${t.p.height}; top: 100vh; left: 0;`,t.p.slider.style.transition=`${t.p.duration}s`,t.p.sliderTransform=`translate3d(0,-${t.p.height},0)`,t.p.slider.parentNode.style.overflowX="hidden",t.p.contentTransform=`translate3d(0,-${t.p.height},0)`,t.p.allowDrag=!1}return t.p.closeOnBlurFunction=function(e){e.preventDefault(),t.close.call(t)},t.p.slideContent&&(t.p.content.style.transition=`${t.p.duration}s`),t.p.allowDrag&&t.body.addEventListener("touchstart",t.p.touchStartFunction),t.p.allowContentInteraction?t.p.contentTouchStartFunction=function(e){}:t.p.contentTouchStartFunction=function(e){e.preventDefault()},t.p.slider.offsetHeight,t.p.slider.style.transition=`${t.p.duration}s`,t.p.content.style["-webkit-tap-highlight-color"]="transparent",t},OSREC.superslide.prototype.open=function(e){var t=this;return!e&&t.p.isOpen?Promise.resolve():new Promise(function(e,n){var o=function(n){(n.target||n.srcElement||n.originalTarget)==t.p.slider&&(t.p.onOpen(),t.p.isOpen=!0,t.p.slider.removeEventListener(t.p.cssTransitionEndEvent,o),t.p.content.addEventListener("touchstart",t.p.contentTouchStartFunction),t.p.closeOnBlur&&(t.body.removeEventListener("touchstart",t.p.touchStartFunction),t.p.content.addEventListener("touchstart",t.p.closeOnBlurFunction),t.p.content.addEventListener("click",t.p.closeOnBlurFunction)),e())};t.p.beforeOpen(),t.p.slider.addEventListener(t.p.cssTransitionEndEvent,o),t.p.slider.style.transform=t.p.sliderTransform,t.p.slider.style.opacity=1,t.p.slideContent&&(t.p.content.style.transform=t.p.contentTransform)})},OSREC.superslide.prototype.close=function(e){var t=this;return e||t.p.isOpen?new Promise(function(e,n){var o=function(n){(n.target||n.srcElement||n.originalTarget)==t.p.slider&&(t.p.onClose(),t.p.isOpen=!1,t.p.slider.removeEventListener(t.p.cssTransitionEndEvent,o),t.p.content.removeEventListener("touchstart",t.p.contentTouchStartFunction),t.p.closeOnBlur&&(t.body.addEventListener("touchstart",t.p.touchStartFunction),t.p.content.removeEventListener("touchstart",t.p.closeOnBlurFunction),t.p.content.removeEventListener("click",t.p.closeOnBlurFunction)),e())};t.p.beforeClose(),t.p.slider.addEventListener(t.p.cssTransitionEndEvent,o),t.p.slider.style.transform=t.p.sliderTransformClose,t.p.slider.style.opacity=1,t.p.slideContent&&(t.p.content.style.transform=t.p.contentTransformClose)}):Promise.resolve()},OSREC.superslide.prototype.toggle=function(){return this.p.isOpen?(console.log("close"),this.close()):(console.log("open"),this.open())},OSREC.superslide.prototype.isOpen=function(){return this.p.isOpen},OSREC.superslide.prototype.ready=function(){return this.p.readyPromise},OSREC.superslide.prototype.destroy=function(){var e=this;this.close().then(function(){e.body.removeEventListener("touchstart",e.p.touchStartFunction),e.body=null,e.p.content.removeEventListener("touchstart",e.p.closeOnBlurFunction),e.p.content.removeEventListener("click",e.p.closeOnBlurFunction),e.p.content=null,e.p.slider=null,e.p=null})};var hasDefine="function"==typeof define,hasExports="undefined"!=typeof module&&module.exports,root="undefined"==typeof window?global:window;hasDefine?define([],function(){return OSREC.superslide}):hasExports?module.exports=OSREC.superslide:root.OSREC=OSREC;
\ No newline at end of file