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| <!-- Example detects the arrow key by adding a eventListener(keydown) to the body by using event.key. --> | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>JavaScript | Detecting arrow key presses.</title> | |
| </head> | |
| <body style="text-align:center;" id="body"> | |
| <h1 style="color:green;">Arrow Key Event Listener Keydown to Body</h1> | |
| <p id="GFG_UP" style="font-size: 16px;">Press an arrow key and click the button to know which key was pressed last time.</p> | |
| <button onclick="gfg_Run()">Detect Arrow key</button> | |
| <p id="GFG_DOWN" | |
| style="color:green; font-size: 20px; font-weight: bold;"></p> | |
| <script> | |
| let el_up = document.getElementById("GFG_UP"); | |
| let el_down = document.getElementById("GFG_DOWN"); | |
| let str = 'No key pressed'; | |
| function gfg_Run() { | |
| el_down.innerHTML = str; | |
| } | |
| document.body.addEventListener('keydown', function(event) | |
| { | |
| const key = event.key; | |
| switch (key) { | |
| case "ArrowLeft": | |
| str = 'Left'; | |
| break; | |
| case "ArrowRight": | |
| str = 'Right'; | |
| break; | |
| case "ArrowUp": | |
| str = 'Up'; | |
| break; | |
| case "ArrowDown": | |
| str = 'Down'; | |
| break; | |
| } | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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