add detach_node param to remove_widget

README.md

@@ -36,7 +36,7 @@ Inspired by [gridster.js](http://gridster.net). Built with love.
     - [get_cell_from_pixel(position)](#get_cell_from_pixelposition)
     - [is_area_empty(x, y, width, height)](#is_area_emptyx-y-width-height)
     - [locked(el, val)](#lockedel-val)
-    - [remove_widget(el)](#remove_widgetel)
+    - [remove_widget(el, detach_node)](#remove_widgetel-detach_node)
     - [remove_all()](#remove_all)
     - [resize(el, width, height)](#resizeel-width-height)
     - [move(el, x, y)](#moveel-x-y)
@@ -286,13 +286,14 @@ Locks/unlocks widget.
 - `el` - widget to modify.
 - `val` - if `true` widget will be locked. 
 
-### remove_widget(el)
+### remove_widget(el, detach_node)
 
 Removes widget from the grid.
 
 Parameters:
 
-- `el` - widget to remove
+- `el` - widget to remove.
+- `detach_node` - if `false` DOM node won't be removed from the tree (Optional. Default `true`).
 
 ### remove_all()
 

src/gridstack.js

@@ -673,12 +673,16 @@
         return this.grid.can_be_placed_with_respect_to_height(node);
     };
 
-    GridStack.prototype.remove_widget = function (el) {
+    GridStack.prototype.remove_widget = function (el, detach_node) {
+        detach_node = typeof detach_node === 'undefined' ? true : detach_node;
         el = $(el);
         var node = el.data('_gridstack_node');
         this.grid.remove_node(node);
-        el.remove();
         this._update_container_height();
+        if (detach_node)
+            el.remove();
+        else
+            el.data('_gridstack_node', null);
     };
 
     GridStack.prototype.remove_all = function () {
@@ -694,7 +698,7 @@
         el.each(function (index, el) {
             el = $(el);
             var node = el.data('_gridstack_node');
-            if (typeof node == 'undefined') {
+            if (typeof node == 'undefined' || node == null) {
                 return;
             }
 
@@ -714,7 +718,7 @@
         el.each(function (index, el) {
             el = $(el);
             var node = el.data('_gridstack_node');
-            if (typeof node == 'undefined') {
+            if (typeof node == 'undefined' || node == null) {
                 return;
             }
 
@@ -744,7 +748,7 @@
         el.each(function (index, el) {
             el = $(el);
             var node = el.data('_gridstack_node');
-            if (typeof node == 'undefined') {
+            if (typeof node == 'undefined' || node == null) {
                 return;
             }
 
@@ -757,7 +761,7 @@
     GridStack.prototype._update_element = function (el, callback) {
         el = $(el).first();
         var node = el.data('_gridstack_node');
-        if (typeof node == 'undefined') {
+        if (typeof node == 'undefined' || node == null) {
             return;
         }