Filtering the columns

The table doesn't really know anything about "filtering", but it does support a button which can be assigned an icon and an onclick method. Perhaps you can use this to create your own filtering UI in an Aside or something.

```
var table = ts.ui.get('#table1');
var popup = ts.ui.Notification;
table.cols([
	{
		label: 'Hello',
		type: 'ts-number',
		button: {
			icon: 'ts-icon-addfilter',
			onclick: function() {
				this.icon = 'ts-icon-delete';
				popup.success('Clicked!');
			}
		}
	}
]);
```

You can change the icon and the onclick method as often as you like.

var table = ts.ui.get('#table1');
var popup = ts.ui.Notification;
var mycol = table.cols()[0];
mycol.button.icon = 'ts-icon-view';
mycol.button.onclick = function() {
	popup.success('Clicked again!');
};

When you implement filtering, you can either build the rows from scratch or update the visible property of the existing row — like in this example.

```
var table = ts.ui.get('#table2');
var popup = ts.ui.Notification;
var isodd = false;
table.rows([[1], [2], [3], [4], [5], [6], [7]]).cols([
	{
		label: 'All numbers',
		type: 'ts-number',
		button: {
			icon: 'ts-icon-addfilter',
			info: 'Show odd rows',
			onclick: function() {
				isodd = !isodd;
				this.icon = isodd ? 'ts-icon-delete' : 'ts-icon-addfilter';
				this.info = isodd ? 'Show all rows' : 'Show odd rows';
				table.cols()[0].label = isodd ? 'Odd numbers' : 'All numbers';
				table.rows().forEach(function(row, i) {
					row.visible = isodd ? (i % 2 === 0) : true;
				});
			}
		}
	}
]);
```

The button gets hidden by the search because it doesn't look right to have both. Let us know if that becomes a problem.