How to Successfully Inject Javascript into a WebBrowser Control?

Injecting Javascript into WebBrowser Control

This article addresses the challenge of injecting Javascript into the Document Object Model (DOM) of a WebBrowser control. While the code snippet provided in the question attempts to inject script, issues arise from unsupported properties on the HtmlElement.

However, an alternative solution has been discovered that resolves these errors successfully. This approach involves:

1. Retrieving the element from the WebBrowser's DOM using GetElementsByTagName.
2. Creating an HtmlElement object (scriptEl) for the script to be injected.
3. Acquiring the IHTMLScriptElement interface for the script element by casting DomElement.
4. Assigning the Javascript code to the text property of the IHTMLScriptElement.
5. Appending the scriptEl to the element.
6. Invoking the injected script by calling InvokeScript.

This revised approach efficiently injects Javascript into the DOM while avoiding the previous errors. By utilizing the IHTMLScriptElement interface, the Javascript code can be injected and executed as desired.

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