Here, the task is to get the character key, which is pressed. In the code written below, an event triggered when any key is pressed and it calls a function then that function identifies it.
Approach:
- Attach an event to the input box. like onkeypress event.
- Call a function when that event happens and pass the event parameter in it.
- In the called function, identify the key pressed.
Example 1: This example using the approach defined above.
<!DOCTYPE HTML> <html>
<head>
<title>
How to find out which character
key is pressed using JavaScript?
</title>
</head>
<body id="body" style="text-align:center;">
<h1 style="color:green;">
GeeksForGeeks
</h1>
<p id="GFG_UP" style="font-size: 15px;
font-weight: bold;">
</p>
<form>
Type Here:
<input type="text"
onkeypress="return GFG_Fun(event)" />
</form>
<p id="GFG_DOWN" style="color:green;
font-size: 20px;
font-weight: bold;">
</p>
<script>
var up = document.getElementById('GFG_UP');
up.innerHTML =
"Type in the Input box to see functioning.";
var down = document.getElementById('GFG_DOWN');
function GFG_Fun(e) {
var key;
if (window.event) {
key = e.keyCode;
} else if (e.which) {
key = e.which;
}
var str = down.innerHTML;
str += String.fromCharCode(key);
down.innerHTML = str;
}
</script>
</body>
</html>
|
Output:
-
Before clicking on the button:
-
After clicking on the button:
Example 2: This example using the approach defined above.
<!DOCTYPE HTML> <html>
<head>
<title>
How to find out which character
key is pressed using JavaScript?
</title>
</head>
<body id="body" style="text-align:center;">
<h1 style="color:green;">
GeeksForGeeks
</h1>
<p id="GFG_UP" style="font-size: 15px;
font-weight: bold;">
</p>
<form>
Type Here:
<input type="text" onkeypress="return GFG_Fun(event)" />
</form>
<p id="GFG_DOWN" style="color:green;
font-size: 20px;
font-weight: bold;">
</p>
<script>
var up = document.getElementById('GFG_UP');
up.innerHTML = "Type in the Input box to see functioning.";
var down = document.getElementById('GFG_DOWN');
function GFG_Fun(e) {
var str = down.innerHTML;
str += e.key
down.innerHTML = str;
}
</script>
</body>
</html>
|
Output:
-
Before clicking on the button:
-
After clicking on the button: