To inject JavaScript in WebBrowser control, use the following steps −
- Firstly, create a Windows Forms application in Visual Studio.
- Now, drag a WebBrowser control to the form
- Set the Url property.
- Right-click the project, choose to Add reference... → COM → Type Libraries
- Select "Microsoft HTML Object Library"
Add the following code to inject JavaScript.
private void myWebBrowser(object sender, WebBrowserDocumentCompletedEventArgs e){ // head element HtmlElement hElement = weBrowser.Document.GetElementsByTagName("head")[0]; // script element HtmlElement sElement = weBrowser.Document.CreateElement("script"); IHTMLScriptElement val = (IHTMLScriptElement)sElement.DomElement; element.text = "function sayHello() { alert('Weclome') }"; hElement.AppendChild(sElement); weBrowser.Document.InvokeScript("How you doing?"); }