add update method

Author: troolee

README.md

@@ -39,6 +39,7 @@ Inspired by [gridster.js](http://gridster.net). Built with love.
     - [move(el, x, y)](#moveel-x-y)
     - [resizable(el, val)](#resizableel-val)
     - [movable(el, val)](#movableel-val)
+    - [update(el, x, y, width, height)](#updateel-x-y-width-height)
     - [will_it_fit(x, y, width, height, auto_position)](#will_it_fitx-y-width-height-auto_position)
   - [Utils](#utils)
     - [GridStackUI.Utils.sort(nodes, dir, width)](#gridstackuiutilssortnodes-dir-width)
@@ -313,6 +314,16 @@ Enables/Disables moving.
 - `el` - widget to modify
 - `val` - if `true` widget will be draggable.
 
+### update(el, x, y, width, height)
+
+Parameters:
+
+- `el` - widget to move
+- `x`, `y` - new position. If value is `null` or `undefined` it will be ignored.
+- `width`, `height` - new dimensions. If value is `null` or `undefined` it will be ignored.
+
+Updates widget position/size.
+
 ### will_it_fit(x, y, width, height, auto_position)
 
 Returns `true` if the `height` of the grid will be less the vertical constraint. Always returns `true` if grid doesn't
@@ -605,6 +616,7 @@ Changes
 
 #### v0.2.3 (development version)
 
+- add `update` method
 - allow to override `resizable`/`draggable` options
 - add `disable`/`enable` methods
 - add `get_cell_from_pixel` (thanks to @juchi)

src/gridstack.js

@@ -751,6 +751,17 @@
         });
     };
 
+    GridStack.prototype.update = function (el, x, y, width, height) {
+        this._update_element(el, function (el, node) {
+            x = (x != null && typeof x != 'undefined') ? x : node.x;
+            y = (y != null && typeof y != 'undefined') ? y : node.y;
+            width = (width != null && typeof width != 'undefined') ? width : node.width;
+            height = (height != null && typeof height != 'undefined') ? height : node.height;
+
+            this.grid.move_node(node, x, y, width, height);
+        });
+    };
+
     GridStack.prototype.cell_height = function (val) {
         if (typeof val == 'undefined') {
             return this.opts.cell_height;