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Asked: 2026-05-11T10:42:31+00:00

I just started learning JavaScript and am wondering why this simple snippet hangs when

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I just started learning JavaScript and am wondering why this simple snippet hangs when I click on the ‘Call function’ button. What am I missing?

<html> <head>  <script type='text/javascript'> function myfunction() { document.write('hello'); } </script>  </head> <body>  <form> <input type='button'  onclick='myfunction()'  value='Call function'> </form>  </body> </html>
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1 Answer

  1. You need to write inside an element or give an element a value, or you should use document write like that : 

    <html> <head>  <script type='text/javascript'> function myfunction() { document.getElementById('lblMessage').innerText = 'hello'; document.getElementById('txtMessage').value = 'hello'; //document.write('hello'); } </script>  </head> <body>  <form>  <script type='text/javascript'> document.write('This is written while page processed by browser !<br />'); </script>  <input type='text' id='txtMessage' /><br /> <span id='lblMessage'></span><br /> <input type='button'  onclick='myfunction()'  value='Call function'> </form>  </body> </html>
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