How to Inject JavaScript into a WebBrowser Control Using IHTMLScriptElement?

Direct WebAssembly JavaScript Injection: A Comprehensive Guide

Injecting JavaScript into a WebBrowser control is a common task when developing web applications. In this context, we delve into a prevalent question: "How to inject Javascript in WebBrowser control?".

When attempting to inject JavaScript using the following code:

scriptEl.InnerHtml = "function sayHello() { alert('hello') }";

You may encounter errors related to InnerHtml property not being supported. This is where deeper exploration is required.

To successfully inject a script into the DOM, consider the following approach:

Start by fetching the head element of the WebBrowser control's document:

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

Next, create a script element and retrieve its IHTMLScriptElement interface:

HtmlElement scriptEl = webBrowser1.Document.CreateElement("script");
IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;

Assign the desired JavaScript code to the text property of the IHTMLScriptElement:

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

Finally, append the script element to the head and invoke the JavaScript function:

head.AppendChild(scriptEl);
webBrowser1.Document.InvokeScript("sayHello");

This solution provides a reliable and effective method for injecting JavaScript into a WebBrowser control, enabling you to dynamically manipulate and interact with the web content displayed in your application.

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