How to Inject Javascript into a WebBrowser Control?

Injecting Javascript into WebBrowser Control

Incorporating Javascript into a WebBrowser control can be a challenge, but there are several methods to accomplish this task.

One technique involves manipulating the Document Object Model (DOM) of the WebBrowser control. However, this approach requires caution due to potential exceptions, as seen in the code provided.

An alternative solution that has been proven effective is to leverage the IHTMLScriptElement interface, as demonstrated in the suggested solution. This interface allows direct access to the text property of the script element, enabling the injection of Javascript into the DOM.

To implement this method, follow these steps:

1. Retrieve the head element of the document using GetElementsByTagName("head")[0].
2. Create a new script element using CreateElement("script").
3. Cast the script element to IHTMLScriptElement using the DomElement property.
4. Assign the desired Javascript code to the text property of the script element.
5. Append the script element to the head element using AppendChild.

Once the script has been injected, you can invoke it directly using InvokeScript. This provides a simple and reliable way to add custom Javascript to your WebBrowser control.

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