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https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_detect_capslock <!DOCTYPE html> <html> <style> #text {display:none;color:red} </style> <body> <h3>Detect Caps Lock</h3> <p>Press the "Caps Lock" key inside the input field to trigger the function.</p> <input id="myInput" value="Some text.."> <p id="text">WARNING! Caps lock is ON.</p> <script> var input = document.getElementById("myInput"); var text = document.getElementById("text"); input.addEventListener("keyup", function(event) { if (event.getModifierState("CapsLock")) { text.style.display = "block"; } else { text.style.display = "none" } }); </script> </body> </html> |