[Javascript] Why does writeln clear the whole page?

Fri Jan 4 21:13:16 CST 2002

Hi,

I am trying to use a  document.writeln  under certain conditions. But it always causes the whole page to be cleared.

For example, this demonstrates the problem.

<html>
<head> <title>WRITELN</title>
  <SCRIPT LANGUAGE="JavaScript"> <!--
  function DoThis()
  {
      document.myForm.myButton.blur();
      document.write('<h1>What happened to the page?</h1>')    
  } 
  //--> </SCRIPT>
</head>
<body>
<br>
   <form name="myForm">
   <input type="button" name="myButton" value="Click Here" 
        onClick="JavaScript:DoThis()">
   <br>
</form>
<br><br>Some text.<br>

</body>
</html>

I thought perhaps anything with focus got replaced by the writeln call, hence the attempt to unfocus (blur) the button -- but to no avail.  I have also tried to place the JS in the body, but with no change. Writeln is documented in lots of resources but I cannot find anything about it clearing the page.  I presume I'm missing something (probably obvious!).

Thanks,
John