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How Can I Safely Inject JavaScript into a WebBrowser Control?

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Release： 2025-01-26 21:31:10
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How Can I Safely Inject JavaScript into a WebBrowser Control?

Best Practices for Injecting JavaScript into a WebBrowser Control

Extending the capabilities of a WebBrowser control often requires injecting custom JavaScript code. While direct manipulation of the InnerHtml property can be problematic, a more robust method involves dynamically creating and appending a script element.

Here's a reliable approach:

  1. Access the document object from the WebBrowser control.
  2. Utilize the Document.CreateElement() method to generate a new script element (HtmlElement).
  3. Cast this element to the IHTMLScriptElement interface to access the text property.
  4. Assign your JavaScript code to the text property of the IHTMLScriptElement.
  5. Append the newly created script element to the document's <head> section using AppendChild().
  6. Execute the injected script function using InvokeScript().

This technique avoids common exceptions associated with directly modifying the HTML and ensures your JavaScript code executes correctly within the WebBrowser control, enabling seamless integration of custom functionality.

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