```
<tfoot>
    <select>
        <option value="222"></option>
        <option value="2222">2222</option>
        <option value="zaza">zaza</option>
    </select>
</tfoot>

```

I tried that: 

```
$('tfoot select').val('zaza');

```

```js
$("tfoot select").val("zaza")
```

```html
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<tfoot>
    <select>
        <option value="222"></option>
        <option value="2222">2222</option>
        <option value="zaza">zaza</option>
    </select>
</tfoot>
```

Any idea ? 
Select = make it selected = trigger the change event