| <!DOCTYPE html> | |
| <html> | |
| <body> | |
| <select> | |
| <option selected>Apple</option> | |
| <option>Orange</option> | |
| <option>Banana</option> | |
| </select> | |
| <script> | |
| var comboBox = document.querySelector('select'); | |
| comboBox.focus(); | |
| // Expand the combo box. | |
| var clickEvent = document.createEvent('MouseEvents'); | |
| clickEvent.initMouseEvent('mousedown', true, true, window); | |
| comboBox.dispatchEvent(clickEvent); | |
| function go() { | |
| document.querySelector('select').selectedIndex = 1; | |
| } | |
| </script> | |
| </body> | |
| </html> |