Double colons in function declaration in Javascript?

Question

Today I found this code snippet:

<object ID="FF" CLASSID="clsid:guid" CODEBASE="url" VIEWASTEXT></object>
<object ID="FileSaver" CLASSID="clsid:guid" CODEBASE="url" VIEWASTEXT></object>
…
<script language="javascript">
    function FileSaver::OnFinished(Status){…}
    function FF::OnFinished(Status){…}
</script>

I can't find anything relevant to explain this syntax. Is it really javascript? Is it correct? If not, how the code should look like?

This is a single page without external script links. Note that function declarations are directly inside <script> block.

after pasting in the code, select it all, and hit the {} button in the editor toolbar. Viola! The language hint isn't necessary, but sometimes helps. — sarnold
– sarnold, Commented May 31, 2011 at 10:11
possible duplicate of What does ‘::’ (double colon) do in javascript for events? — outis
– outis, Commented May 31, 2011 at 10:12
@13xforever: Might I suggest you post the answer as an actual answer to your own question? That's perfectly acceptable :-) — Mutation Person
– Mutation Person, Commented May 31, 2011 at 10:29

Community · Accepted Answer · 2017-05-23 12:01:29Z

4

Thanks for everyone who looked into this.

Anyway, just as one could expect, not after five minutes after submitting the question, I found How to handle an ActiveX event in Javascript question about ActiveX callback handlers in IE, so it answers the main part of the question. As well, as the question that @outis has linked.

But I can't find any documentation on MSDN and that's troubling.

Conclusion: this is IE-specific ECMAScript extension for event handler declaration.

edited May 23, 2017 at 12:01

CommunityBot

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answered Jun 9, 2011 at 10:39

13xforever

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1 Comment

user20416 Over a year ago

There is this article on MSDN. Also, I've written a library to work the many limitations of these event handlers.

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