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How to Inject JavaScript into a WebBrowser Control Without Using InnerHtml?
How to Inject JavaScript into a WebBrowser Control Without Using InnerHtml?
Nov 19, 2024 pm 06:45 PM
Injecting JavaScript into a WebBrowser Control
Question:
I am trying to inject a JavaScript script into a WebBrowser control, but encountering errors when setting the InnerHtml property of the script element. Is there an alternative method to achieve this?
Answer:
雖然原始嘗試未能成功，但可以使用以下方法將腳本注入 DOM：
HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];
HtmlElement scriptEl = webBrowser1.Document.CreateElement("script");
IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;
element.text = "function sayHello() { alert('hello') }";
head.AppendChild(scriptEl);
webBrowser1.Document.InvokeScript("sayHello");
Explanation:
-
Get IHTMLScriptElement Interface:
- The DomElement property exposes the underlying COM object. Casting this to IHTMLScriptElement allows access to the text property.
-
Set Script Text:
- Assign the desired JavaScript code to the text property.
-
Invoke Script:
- Call InvokeScript on the document to execute the injected script.
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