Added option "selectAllRender" that defines "Select all" control markup

Author: mpryvkin

js/dataTables.checkboxes.js

@@ -1,12 +1,12 @@
-/*! Checkboxes 1.2.7
+/*! Checkboxes 1.2.8
  *  Copyright (c) Gyrocode (www.gyrocode.com)
  *  License: MIT License
  */
 
 /**
  * @summary     Checkboxes
  * @description Checkboxes extension for jQuery DataTables
- * @version     1.2.7
+ * @version     1.2.8
  * @file        dataTables.checkboxes.js
  * @author      Gyrocode (http://www.gyrocode.com/projects/jquery-datatables-checkboxes/)
  * @contact     http://www.gyrocode.com/contacts
@@ -214,10 +214,24 @@ Checkboxes.prototype = {
                // Save previous HTML content
                $colHeader.data('html', $colHeader.html());
 
-               $colHeader
-                  .html('<input type="checkbox">')
-                  .addClass('dt-checkboxes-select-all')
-                  .attr('data-col', i);
+               // If "Select all" control markup is provided
+               if(ctx.aoColumns[i].checkboxes.selectAllRender !== null){
+                  var selectAllHtml = '';
+
+                  // If "selectAllRender" option is a function
+                  if($.isFunction(ctx.aoColumns[i].checkboxes.selectAllRender)){
+                     selectAllHtml = ctx.aoColumns[i].checkboxes.selectAllRender();
+
+                  // Otherwise, if "selectAllRender" option is a string
+                  } else if(typeof ctx.aoColumns[i].checkboxes.selectAllRender === 'string'){
+                     selectAllHtml = ctx.aoColumns[i].checkboxes.selectAllRender;
+                  }
+
+                  $colHeader
+                     .html(selectAllHtml)
+                     .addClass('dt-checkboxes-select-all')
+                     .attr('data-col', i);
+               }
             }
          }
       }
@@ -870,7 +884,15 @@ Checkboxes.defaults = {
     * @type {Function}
     * @default  `null`
     */
-   selectAllCallback: null
+   selectAllCallback: null,
+
+   /**
+    * "Select all" control markup
+    *
+    * @type {mixed}
+    * @default `<input type="checkbox">`
+    */
+   selectAllRender: '<input type="checkbox">'
 };
 
 
@@ -1000,7 +1022,7 @@ Api.registerPlural( 'cells().checkboxes.enable()', 'cell().checkboxes.enable()',
             // If data is in the list
             if(ctx.checkboxes.s.data[colIdx].hasOwnProperty(cellData)){
                // Update selection based on current state:
-               // if checkbox is enabled then select row; 
+               // if checkbox is enabled then select row;
                // otherwise, deselect row
                ctx.checkboxes.updateSelect(rowIdx, state);
             }
@@ -1061,7 +1083,7 @@ Api.registerPlural( 'columns().checkboxes.selected()', 'column().checkboxes.sele
  * @name Checkboxes.version
  * @static
  */
-Checkboxes.version = '1.2.7';
+Checkboxes.version = '1.2.8';