diff --git a/src/components/rangeslider/create_slider.js b/src/components/rangeslider/create_slider.js
index 61d6854e783..83caa2ad7eb 100644
--- a/src/components/rangeslider/create_slider.js
+++ b/src/components/rangeslider/create_slider.js
@@ -141,27 +141,49 @@ module.exports = function createSlider(gd) {
         window.addEventListener('mouseup', mouseUp);
 
         function mouseMove(e) {
-            var delta = +e.clientX - startX;
+            var delta = +e.clientX - startX,
+                pixelMin,
+                pixelMax;
 
             switch(target) {
                 case slideBox:
                     slider.style.cursor = 'ew-resize';
-                    setPixelRange(+maxVal + delta, +minVal + delta);
+
+                    pixelMin = +minVal + delta;
+                    pixelMax = +maxVal + delta;
+
+                    setPixelRange(pixelMin, pixelMax);
+                    setDataRange(pixelToData(pixelMin), pixelToData(pixelMax));
                     break;
 
                 case grabAreaMin:
                     slider.style.cursor = 'col-resize';
-                    setPixelRange(+minVal + delta, +maxVal);
+
+                    pixelMin = +minVal + delta;
+                    pixelMax = +maxVal;
+
+                    setPixelRange(pixelMin, pixelMax);
+                    setDataRange(pixelToData(pixelMin), pixelToData(pixelMax));
                     break;
 
                 case grabAreaMax:
                     slider.style.cursor = 'col-resize';
-                    setPixelRange(+minVal, +maxVal + delta);
+
+                    pixelMin = +minVal;
+                    pixelMax = +maxVal + delta;
+
+                    setPixelRange(pixelMin, pixelMax);
+                    setDataRange(pixelToData(pixelMin), pixelToData(pixelMax));
                     break;
 
                 default:
                     slider.style.cursor = 'ew-resize';
-                    setPixelRange(offsetX, offsetX + delta);
+
+                    pixelMin = offsetX;
+                    pixelMax = offsetX + delta;
+
+                    setPixelRange(pixelMin, pixelMax);
+                    setDataRange(pixelToData(pixelMin), pixelToData(pixelMax));
                     break;
             }
         }
@@ -173,6 +195,17 @@ module.exports = function createSlider(gd) {
         }
     });
 
+    function pixelToData(pixel) {
+        var rangeMin = options.range[0],
+            rangeMax = options.range[1],
+            range = rangeMax - rangeMin,
+            dataValue = pixel / width * range + rangeMin;
+
+        dataValue = Lib.constrain(dataValue, rangeMin, rangeMax);
+
+        return dataValue;
+    }
+
 
     function setRange(min, max) {
         min = min || -Infinity;
@@ -187,52 +220,49 @@ module.exports = function createSlider(gd) {
         setPixelRange(pixelMin, pixelMax);
     }
 
+    function setDataRange(dataMin, dataMax) {
+
+        if(window.requestAnimationFrame) {
+            window.requestAnimationFrame(function() {
+                Plotly.relayout(gd, 'xaxis.range', [dataMin, dataMax]);
+            });
+        } else {
+            setTimeout(function() {
+                Plotly.relayout(gd, 'xaxis.range', [dataMin, dataMax]);
+            }, 16);
+        }
+    }
 
-    function setPixelRange(min, max) {
 
-        min = Lib.constrain(min, 0, width);
-        max = Lib.constrain(max, 0, width);
+    function setPixelRange(pixelMin, pixelMax) {
 
-        if(max < min) {
-            var temp = max;
-            max = min;
-            min = temp;
+        pixelMin = Lib.constrain(pixelMin, 0, width);
+        pixelMax = Lib.constrain(pixelMax, 0, width);
+
+        if(pixelMax < pixelMin) {
+            var temp = pixelMax;
+            pixelMax = pixelMin;
+            pixelMin = temp;
         }
 
         helpers.setAttributes(slider, {
-            'data-min': min,
-            'data-max': max
+            'data-min': pixelMin,
+            'data-max': pixelMax
         });
 
         helpers.setAttributes(slideBox, {
-            'x': min,
-            'width': max - min
+            'x': pixelMin,
+            'width': pixelMax - pixelMin
         });
 
-        helpers.setAttributes(maskMin, { 'width': min });
+        helpers.setAttributes(maskMin, { 'width': pixelMin });
         helpers.setAttributes(maskMax, {
-            'x': max,
-            'width': width - max
+            'x': pixelMax,
+            'width': width - pixelMax
         });
 
-        helpers.setAttributes(grabberMin, { 'transform': 'translate(' + (min - handleWidth - 1) + ')' });
-        helpers.setAttributes(grabberMax, { 'transform': 'translate(' + max + ')' });
-
-        var rangeMin = options.range[0],
-            rangeMax = options.range[1],
-            range = rangeMax - rangeMin,
-            dataMin = min / width * range + rangeMin,
-            dataMax = max / width * range + rangeMin;
-
-        if(window.requestAnimationFrame) {
-            window.requestAnimationFrame(function() {
-                Plotly.relayout(gd, 'xaxis.range', [dataMin, dataMax]);
-            });
-        } else {
-            setTimeout(function() {
-                Plotly.relayout(gd, 'xaxis.range', [dataMin, dataMax]);
-            }, 16);
-        }
+        helpers.setAttributes(grabberMin, { 'transform': 'translate(' + (pixelMin - handleWidth - 1) + ')' });
+        helpers.setAttributes(grabberMax, { 'transform': 'translate(' + pixelMax + ')' });
     }
 
 
diff --git a/src/lib/index.js b/src/lib/index.js
index 13a053004c4..72177b36ac5 100644
--- a/src/lib/index.js
+++ b/src/lib/index.js
@@ -256,17 +256,6 @@ lib.smooth = function(arrayIn, FWHM) {
     return arrayOut;
 };
 
-// helpers for promises
-
-/**
- * promiseError: log errors properly inside promises
- * use:
- * <promise>.then(undefined,Plotly.Lib.promiseError) (for IE compatibility)
- * or <promise>.catch(Plotly.Lib.promiseError)
- * TODO: I guess we need another step to send this error to Sentry?
- */
-lib.promiseError = function(err) { console.log(err, err.stack); };
-
 /**
  * syncOrAsync: run a sequence of functions synchronously
  * as long as its returns are not promises (ie have no .then)
diff --git a/src/plot_api/plot_api.js b/src/plot_api/plot_api.js
index f567d260680..2da62220350 100644
--- a/src/plot_api/plot_api.js
+++ b/src/plot_api/plot_api.js
@@ -2438,8 +2438,9 @@ Plotly.relayout = function relayout(gd, astr, val) {
     }
 
     function setRange(changes) {
-        var newMin = changes['xaxis.range[0]'],
-            newMax = changes['xaxis.range[1]'];
+
+        var newMin = changes['xaxis.range'] ? changes['xaxis.range'][0] : changes['xaxis.range[0]'],
+            newMax = changes['xaxis.range'] ? changes['xaxis.range'][1] : changes['xaxis.range[1]'];
 
         var rangeSlider = fullLayout.xaxis && fullLayout.xaxis.rangeslider ?
             fullLayout.xaxis.rangeslider : {};
diff --git a/test/jasmine/tests/range_slider_test.js b/test/jasmine/tests/range_slider_test.js
index 17d7ff808d6..a603c21b324 100644
--- a/test/jasmine/tests/range_slider_test.js
+++ b/test/jasmine/tests/range_slider_test.js
@@ -137,6 +137,25 @@ describe('the range slider', function() {
                 expect(rangeDiff3).toBeLessThan(rangeDiff2);
             }).then(done);
         });
+
+        it('should relayout with relayout "array syntax"', function(done) {
+            Plotly.relayout(gd, 'xaxis.range', [10, 20])
+                .then(function() {
+                    expect(gd._fullLayout.xaxis.range).toEqual([10, 20]);
+                    expect(+rangeSlider.getAttribute('data-min')).toBeCloseTo(125.51, 0);
+                    expect(+rangeSlider.getAttribute('data-max')).toBeCloseTo(251.02, 0);
+                })
+                .then(done);
+        });
+
+        it('should relayout with relayout "element syntax"', function(done) {
+            Plotly.relayout(gd, 'xaxis.range[0]', 10)
+                .then(function() {
+                    expect(gd._fullLayout.xaxis.range[0]).toEqual(10);
+                    expect(+rangeSlider.getAttribute('data-min')).toBeCloseTo(125.51, 0);
+                })
+                .then(done);
+        });
     });