added height/width constraint to canvas-datagrid

demos/datagrid/README.md

@@ -34,6 +34,13 @@ var grid = canvasDatagrid({
 });
 ```
 
+For large data sets, it's necessary to constrain the size of the grid.
+
+```js
+grid.style.height = '100%';
+grid.style.width = '100%';
+```
+
 Once the workbook is read and the worksheet is selected, assigning the data
 variable automatically updates the view:
 

demos/datagrid/index.html

@@ -64,6 +64,8 @@ var process_wb = (function() {
 
 		/* update canvas-datagrid */
 		if(!cDg) cDg = canvasDatagrid({ parentNode:HTMLOUT, data:data });
+		cDg.style.height = '100%';
+		cDg.style.width = '100%';
 		cDg.data = data;
 		XPORT.disabled = false;