如何在WebBrowser控件中注入CSS?

时间:2011-03-31 07:30:23

标签: c# .net winforms webbrowser-control

据我所知,有一种方法可以将javascript注入DOM。下面是使用webbrowser控件注入javascript的示例代码:

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");

有没有更简单的方法将css注入DOM?

2 个答案:

答案 0 :(得分:27)

我自己没有尝试过,但由于CSS样式规则可以使用<style>标记包含在文档中,如下所示:

<html>
<head>
<style type="text/css">
    h1 {color:red}
    p {color:blue}
</style>
</head>
你可以尝试给予:

HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];
HtmlElement styleEl = webBrowser1.Document.CreateElement("style");
IHTMLStyleElement element = (IHTMLStyleElement)styleEl.DomElement;
IHTMLStyleSheetElement styleSheet = element.styleSheet;
styleSheet.cssText = @"h1 { color: red }";
head.AppendChild(styleEl);
一个去吧。您可以在IHTMLStyleElement here上找到更多信息。

修改

似乎答案比我原先想的要简单得多:

  using mshtml;

  IHTMLDocument2 doc = (webBrowser1.Document.DomDocument) as IHTMLDocument2;
  // The first parameter is the url, the second is the index of the added style sheet.
  IHTMLStyleSheet ss = doc.createStyleSheet("", 0);

  // Now that you have the style sheet you have a few options:
  // 1. You can just set the content as text.
  ss.cssText = @"h1 { color: blue; }";
  // 2. You can add/remove style rules.
  int index = ss.addRule("h1", "color: red;");
  ss.removeRule(index);
  // You can even walk over the rules using "ss.rules" and modify them.

我写了一个小测试项目,以验证这是否有效。我通过在MSDN上搜索IHTMLStyleSheet来获得最终结果,我在this pagethis pagethis one上发生了这种情况。

答案 1 :(得分:0)

对我来说,这就像在DocumentText.中首先设置样式一样简单,显然不是最佳实践,但它适用于简单的CSS。

webBrowser1.DocumentText = "<style> " +
                                 "body { " +
                                    "font-family: Algerian; " +
                                  "} " +
                            "</style> "+
                            "<a href='https://www.google.ca'>Test</a>";