How to Identify the Pressed Character Key in JavaScript Across Browsers?

Identifying Pressed Character Key in Javascript

Detecting the character key pressed in a cross-browser compatible manner using pure Javascript can be achieved through the following steps:

Solution:

To accomplish this, we utilize two methods depending on the browser used:

1. Internet Explorer: If the window.event object is available, extract the keyCode property of the event object.
2. Netscape/Firefox/Opera: If the e.which property is present, utilize it to retrieve the character key code.

Example Code:

The following code snippet demonstrates the implementation:

<code class="javascript">function myKeyPress(e) {
  var keynum;

  if (window.event) { // IE
    keynum = e.keyCode;
  } else if (e.which) { // Netscape/Firefox/Opera
    keynum = e.which;
  }

  alert(String.fromCharCode(keynum));
}</code>

Usage:

To use this code, incorporate it into your HTML document alongside an input field that can capture keypress events:

<code class="html"><input type="text" onkeypress="return myKeyPress(event)" /></code>

When a character key is pressed within the input field, the code snippet will execute the myKeyPress function, identify the character key code, and display the corresponding character in an alert window.

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