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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