W3School TIY Editor
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<html> <head> <script type="text/javascript"> function disableField() { document.getElementById("text1").disabled=true } </script> </head> <body> <form> <input type="text" id="text1" value="Hello world!" /> <input type="button" id="button1" onclick="disableField()" value="Disable text field" /> </form> </body> </html>