Implemented functions `setWindow` and `getWindow`

HISTORY.md

@@ -10,6 +10,7 @@ http://visjs.org
 - Implemented options `selectable`, `editable`.
 - Added events when dragging the custom time bar.
 - Multiple items can be selected using ctrl+click or shift+click.
+- Implemented functions `setWindow(start, end)` and `getWindow()`.
 
 ### DataSet
 

docs/timeline.html

@@ -599,10 +599,16 @@ var options = {
 
   <tr>
     <td>getSelection()</td>
-    <td>ids</td>
+    <td>Number[]</td>
     <td>Get an array with the ids of the currently selected items.</td>
   </tr>
 
+  <tr>
+    <td>getWindow()</td>
+    <td>Object</td>
+    <td>Get the current visible window. Returns an object with properties <code>start: Date</code> and <code>end: Date</code>.</td>
+  </tr>
+
   <tr>
     <td>on(event, callback)</td>
     <td>none</td>
@@ -649,6 +655,12 @@ var options = {
     </td>
   </tr>
 
+  <tr>
+    <td>setWindow(start, end)</td>
+    <td>none</td>
+    <td>Set the current visible window. The parameters <code>start</code> and <code>end</code> can be a <code>Date</code>, <code>Number</code>, or <code>String</code>. If the parameter value of <code>start</code> or <code>end</code> is null, the parameter will be left unchanged.</td>
+  </tr>
+
 </table>
 
 

src/timeline/Timeline.js

@@ -432,6 +432,28 @@ Timeline.prototype.getSelection = function getSelection() {
   return this.content ? this.content.getSelection() : [];
 };
 
+/**
+ * Set the visible window. Both parameters are optional, you can change only
+ * start or only end.
+ * @param {Date | Number | String} [start] Start date of visible window
+ * @param {Date | Number | String} [end]   End date of visible window
+ */
+Timeline.prototype.setWindow = function setWindow(start, end) {
+  this.range.setRange(start, end);
+};
+
+/**
+ * Get the visible window
+ * @return {{start: Date, end: Date}}   Visible range
+ */
+Timeline.prototype.getWindow = function setWindow() {
+  var range = this.range.getRange();
+  return {
+    start: new Date(range.start),
+    end: new Date(range.end)
+  };
+};
+
 /**
  * Handle selecting/deselecting an item when tapping it
  * @param {Event} event