How to inject HTML and JavaScript into an existing page using C#

Question

I'm working on an add-on for IE which will show an alert pop-up when user visit a specific website. In Fire Fox and Chrome, I did this by injecting pop-up code (in html) in to the body of web page so it will show the alert to user. In IE, I find some ways to inject html into web page like:

http://www.codeproject.com/Articles/149258/Inject-HTML-and-JavaScript-into-an-existing-page-w andhttp://czetsuya-tech.blogspot.com/2011/05/c-insert-dynamic-html-html-injection.html

but the problem is if I use IHTMLDocument2 Interface, I can't inject HTML to a web page having document.body = null. I've been searching so much but still can't find any solution. So my question is there any other way to inject html into body of a web page in IE add-on developemt?

Thank in advance!

Answer 1

Under what circumstances is document.body null in IE?

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Jose R. MCP

Answer 2

For example is this page: http://minhlinh.us

I did a check in Add-on code and had it to print out the document.body. Then the result was null

Answer 3

Wow, really?  And the document type is of type IHTMLDocument2?  Because I can ask IE8 to show me the source of the page with no issues by hitting F12 and I see the HTML and BODY tags.  It just makes sense for it to have a body.  If I have time later today I'll do a small test.

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Jose R. MCP

Answer 4

any help, please? :(