Javascript create event with IE9

StackOverflow https://stackoverflow.com/questions/23361387

Question

I'm trying to create a custom Event in JavaScript.

I have a WPF applciation with a WebBrowser that run Internet Explorer 9.

The code :

var evt = document.createEvent("Event");

evt.initEvent("readerstatechanged", true, false);
window.dispatchEvent(evt);

Error :

enter image description here

I also tried :

var evt = new Event("Event");

Error :

enter image description here

Do you have an idea how to create a custom event with IE 9 ?

Edit :

I changed with createEventObject, but then the "InitEvent" doesn't work :

            var evt = document.createEventObject("Event");

            evt.initEvent("printerstatechanged", true, false);
            window.dispatchEvent(evt);

Then I need to use attachEvent like this :

            window.attachEvent('printerstatechanged', function (e) {
                //Do something
            });
Was it helpful?

Solution

IE9 supports DOM3 events, so you can create and hook custom events. Here's a complete example, which works in IE9 and any other DOM3-compatible browser: Live Copy

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>IE9+ Custom Event</title>
</head>
<body>
  <script>
    (function() {
      // Hooking the event, in this case on documentElement
      document.documentElement.addEventListener("readerstatechanged", function() {
        display("readerstatechanged received");
      });

      // Creating it
      display("Creating");
      var evt = document.createEvent("CustomEvent");
      evt.initCustomEvent("readerstatechanged", true, false, {});
      // Could put custom data here -------------------------^^

      // Firing it on documentElement
      display("Firing");
      document.documentElement.dispatchEvent(evt);

      function display(msg) {
        var p = document.createElement('p');
        p.innerHTML = String(msg);
        document.body.appendChild(p);
      }
    })();
  </script>
</body>
</html>

It will not work in IE8, but as you've emphasized IE9...

If your site is being displayed in the seriously-misnamed "compatibility view," IE turns off these standard features, making it less compatible with the real world rather than more. Using "compatibility view" for intranet sites is the default setting, I believe, which is just asinine. You can reassure IE that you actually know what you're doing by adding a meta tag to your head section:

<meta http-equiv="X-UA-Compatible" content="IE=Edge"/>
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