JavaScript DHTML/Event onMethod/onSelectionChange
"onSelectionChange" Example
<source lang="html4strict">
<head> <script language="JavaScript" for=document event=onselectionchange>
alert("The selection has changed");
</script> </head> <body>
Copy some text into the textarea
<form> <textarea cols=30 contenteditable=true>Click here</textarea> </form> </body>
</source>