How to Safely Inject JavaScript into a WebBrowser Control?

Inject JavaScript

Injecting JavaScript into the Webbrowser control is an effective technique of the webpage function displayed in the control control. However, the InnerHTML property of the HTMLELEMENT object may cause System.notsupportedException error.

In order to effectively inject JavaScript, different methods need to be used. The following steps outline the solution:

Get the wead element of the webpage in the webbrowser control:

HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];

Create a script element and specify its type:

HtmlElement scriptEl = webBrowser1.Document.CreateElement("script");
scriptEl.SetAttribute("type", "text/javascript");

IHTMLSCRIPTELEMENT interface to get the script element:

IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;

Set the text attribute of IHTMLSCRIPTELEMENT to define JavaScript code:

element.text = "function sayHello() { alert('hello') }";

Attach the script element to Head element:

head.AppendChild(scriptEl);

JavaScript function calls from Webbrowser control:

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webBrowser1.Document.InvokeScript("sayHello");

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