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F4SDwebService/Publish/Scripts/src/modifiers/keepTogether.js

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+/**
+ * @function
+ * @memberof Modifiers
+ * @argument {Object} data - The data object generated by update method
+ * @argument {Object} options - Modifiers configuration and options
+ * @returns {Object} The data object, properly modified
+ */
+export default function keepTogether(data) {
+  const { popper, reference } = data.offsets;
+  const placement = data.placement.split('-')[0];
+  const floor = Math.floor;
+  const isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
+  const side = isVertical ? 'right' : 'bottom';
+  const opSide = isVertical ? 'left' : 'top';
+  const measurement = isVertical ? 'width' : 'height';
+
+  if (popper[side] < floor(reference[opSide])) {
+    data.offsets.popper[opSide] =
+      floor(reference[opSide]) - popper[measurement];
+  }
+  if (popper[opSide] > floor(reference[side])) {
+    data.offsets.popper[opSide] = floor(reference[side]);
+  }
+
+  return data;
+}