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As per my knowledge,there is a way to inject javascript into the DOM. Below is the sample code that injects javascript with the webbrowser control:
HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0]; HtmlElement scriptEl = webBrowser1.Document.CreateElement("script"); IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement; element.text = "function sayHello() { alert('hello') }"; head.AppendChild(scriptEl); webBrowser1.Document.InvokeScript("sayHello"); Is there an easier way to inject css into the DOM?
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I didn't try this myself but since CSS style rules can be included in a document using the <style> tag as in:
<html> <head> <style type="text/css"> h1 {color:red} p {color:blue} </style> </head> you could try giving:
HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0]; HtmlElement styleEl = webBrowser1.Document.CreateElement("style"); IHTMLStyleElement element = (IHTMLStyleElement)styleEl.DomElement; IHTMLStyleSheetElement styleSheet = element.styleSheet; styleSheet.cssText = @"h1 { color: red }"; head.AppendChild(styleEl); a go. You can find more info on the IHTMLStyleElement here.
It seems the answer is much much simpler than I originally thought:
using mshtml; IHTMLDocument2 doc = (webBrowser1.Document.DomDocument) as IHTMLDocument2; // The first parameter is the url, the second is the index of the added style sheet. IHTMLStyleSheet ss = doc.createStyleSheet("", 0); // Now that you have the style sheet you have a few options: // 1. You can just set the content as text. ss.cssText = @"h1 { color: blue; }"; // 2. You can add/remove style rules. int index = ss.addRule("h1", "color: red;"); ss.removeRule(index); // You can even walk over the rules using "ss.rules" and modify them. I wrote a small test project to verify that this works. I arrived at this final result by doing a search on MSDN for IHTMLStyleSheet, upon which I happened across this page, this page and this one.
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