Uncaught TypeError: undefined is not a function in javascript

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JavaScript

<script type="text/javascript" language="javascript">
      window.history.forward(1);
      document.attachEvent("keydown", my_onkeydown_handler);
      function my_onkeydown_handler(e) {
          switch (e.keyCode) {
              case 116: // F5;
                  e.returnValue = false;
                  e.keyCode = 0;
                  window.status = "We have disabled F5";
                  break;
          }
      }
  </script>

This is my code in javascript
but it shows the error "Uncaught TypeError: undefined is not a function"
what is wrong with my code ?

Posted 1-Dec-14 1:25am

Madhuri Gamane

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2 solutions

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Kornfeld Eliyahu Peter · Accepted Answer · 2014-12-01T01:38:00

Solution 1

attachEvent function is only supported in IE. It's a not standard function and you should not use it!
Use addEventListener[^] instead!

Posted 1-Dec-14 1:38am

Kornfeld Eliyahu Peter

Comments

Madhuri Gamane 1-Dec-14 23:29pm

Thank you

Kornfeld Eliyahu Peter 2-Dec-14 2:09am

You are welcome...

swati0725 · Accepted Answer · 2014-12-01T02:09:00

Use addEventListener instead of attachEvent(no longer supported).

http://msdn.microsoft.com/en-us/library/ie/ms536343%28v=vs.85%29.aspx[^]

window.history.forward(1);
document.addEventListener("keydown", my_onkeydown_handler);
function my_onkeydown_handler(e) {
switch (e.keyCode) {
case 116: // F5;
e.returnValue = false;
e.keyCode = 0;
window.status = "We have disabled F5";
break;
}
}