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September 28, 2019 12:58
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Simple HTML form with binary to decimal converter
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>bin to dec</title> | |
| </head> | |
| <body> | |
| <div> | |
| <label for="bin">Enter binary number: </label> | |
| <input type="text" name="bin" id="bin"><br/> | |
| <span>Decimal: <span id="dec"></span></span> | |
| </div> | |
| <script type="text/javascript"> | |
| document.getElementById("bin").addEventListener("keydown", function(event){ | |
| var keyCode = parseInt(event.keyCode); | |
| var allowedCodes = [8, 37, 39, 48, 49]; | |
| if(isNaN(keyCode) || (allowedCodes.indexOf(keyCode) == -1)) { | |
| event.preventDefault(); | |
| } | |
| }); | |
| document.getElementById("bin").addEventListener("keyup", function(event){ | |
| var bin = parseInt(document.getElementById("bin").value, 2); | |
| if(!isNaN(bin)) { | |
| document.getElementById("dec").innerHTML = bin; | |
| } else { | |
| document.getElementById("dec").innerHTML = ""; | |
| } | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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