You did not provide any code with your question, so I canβt say what the problem is.
The problem is probably related to your code.
I used the following html code and it works fine. Please check it:
<html>
<head>
<script type="text/javascript">
function read()
{
var name = document.getElementById('p').value;
alert('Hi: '+name);
}
function copy()
{
alert('Copy');
}
function paste()
{
alert('Paste');
}
</script>
</head>
<body oncopy='copy();' onpaste='paste();'>
<form>
<input type="text" name='m' id='p'/>
<input type="button" value="Submit" onclick='read();'/>
</form>
</body>
</html>
source
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