webbrowser和js交互小结

 public partial class MainWindow : Window
    {
        private WebBrowser webBrowser = new WebBrowser();

        public MainWindow()
        {
            InitializeComponent();

             this.webBrowser.LoadCompleted += new LoadCompletedEventHandler(webBrowser_LoadCompleted);

            //使webbrowser寄宿于Label上，实现webborwser内部跳转，不用IE打开
            Label lb = new Label { Content = webBrowser };
            WebBrowserHelper webBrowserHelper = new WebBrowserHelper(webBrowser);
            HelperRegistery.SetHelperInstance(lb, webBrowserHelper);
            webBrowserHelper.NewWindow += WebBrowserOnNewWindow;
            this.lbBrowserHost.Content = lb;

            // this.webBrowser.Navigate(new Uri("http://www.baidu.com", UriKind.RelativeOrAbsolute));
        }

        private void WebBrowserOnNewWindow(object sender, CancelEventArgs e)
        {
            dynamic browser = sender;
            dynamic activeElement = browser.Document.activeElement;
            var link = activeElement.ToString();
            this.webBrowser.Navigate(new Uri(link, UriKind.RelativeOrAbsolute));
            e.Cancel = true;
        }
    }

    {
        public MainWindow()
        {
            InitializeComponent();
            this.webBrowser1.Navigate(new Uri("http://www.baidu.com", UriKind.RelativeOrAbsolute));
            this.webBrowser1.LoadCompleted += new LoadCompletedEventHandler(webBrowser1_LoadCompleted);

        }
        private IServiceProvider serviceProvider;
        void webBrowser1_LoadCompleted(object sender, NavigationEventArgs e)
        {
            if (this.serviceProvider == null)
            {
                serviceProvider = (IServiceProvider)webBrowser1.Document;
                if (serviceProvider != null)
                {
                    Guid serviceGuid = new Guid("0002DF05-0000-0000-C000-000000000046");
                    Guid iid = typeof(SHDocVw.WebBrowser).GUID;
                    var webBrowserPtr = (SHDocVw.WebBrowser)serviceProvider
                        .QueryService(ref serviceGuid, ref iid);
                    if (webBrowserPtr != null)
                    {
                        webBrowserPtr.NewWindow2 += webBrowser1_NewWindow2;
                    }
                }
            }
        }

        private void webBrowser1_NewWindow2(ref object ppDisp, ref bool Cancel)
        {
            dynamic browser = this.webBrowser1;
            dynamic activeElement = browser.Document.activeElement;
            var link = activeElement.ToString();
            this.webBrowser1.Navigate(new Uri(link, UriKind.RelativeOrAbsolute));
            Cancel = true;
        }

        [ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
        [Guid("6d5140c1-7436-11ce-8034-00aa006009fa")]
        internal interface IServiceProvider
        {
            [return: MarshalAs(UnmanagedType.IUnknown)]
            object QueryService(ref Guid guidService, ref Guid riid);
        }
    }

            //引用Microsoft.mshtml

            //1、添加一个html标签到id为lg的div中
            HTMLDocument doc = (HTMLDocument)this.webBrowser.Document;
            IHTMLElement lbelem = doc.createElement("button");
            lbelem.innerText = "test";
            lbelem.style.background = "red";
            IHTMLDOMNode node = doc.getElementById("lg") as IHTMLDOMNode;
            node.appendChild(lbelem as IHTMLDOMNode);   

            //2、设置id为su的标签value值和style
            //2.1 使用setAttribute
            HTMLDocument doc = (HTMLDocument)this.webBrowser.Document;
            IHTMLElement search = doc.getElementById("su");
            IHTMLDOMAttribute att = search.getAttribute("value") as IHTMLDOMAttribute;
            search.setAttribute("value", "百度一下");
            //search.click();
            search.style.display = "none"; 
            //2.2 使用outerHtml
            search.outerHTML = "<input id=\"su\" value=\"百度一下\" class=\"bg s_btn\" type=\"submit\" onclick=\"alert(‘百度一下‘);\" />";
            //2.3 使用IHTMLDOMAttribute
            IHTMLAttributeCollection attributes = (search as IHTMLDOMNode).attributes as IHTMLAttributeCollection;
            foreach (IHTMLDOMAttribute attr in attributes)
            {
                if (attr.nodeName == "value")
                {
                    attr.nodeValue = "百度一下";
                }
            }
    
           //3、替换应用了类样式mnav的a标签
            HTMLDocument doc = (HTMLDocument)this.webBrowser.Document;
            IHTMLElementCollection collect = doc.getElementsByTagName("a");
            foreach (IHTMLElement elem in collect)
            {
                if (!(elem is IHTMLUnknownElement) && elem.className != null)
                {
                    if (elem.className.Equals("mnav", StringComparison.OrdinalIgnoreCase))
                    {
                        elem.outerHTML = "<a href=‘#‘ title=‘替换标签‘ >替换</a>";
                    }
                }
            }

            //4、删除节点
            HTMLDocument doc = (HTMLDocument)this.webBrowser.Document;
            IHTMLElement search = doc.getElementById("su");
            IHTMLDOMNode node = search as IHTMLDOMNode;
            node.parentNode.removeChild(node);

            //5、JS事件
            //5.1 添加JS
            HTMLDocument doc = (HTMLDocument)this.webBrowser.Document;
            IHTMLElement search = doc.getElementById("su");
            search.outerHTML = "<input id=\"su\" value=\"百度一下\" class=\"bg s_btn\" type=\"submit\" onclick=\"onClick();\" />";
            IHTMLScriptElement scriptErrorSuppressed = (IHTMLScriptElement)doc.createElement("script");
            scriptErrorSuppressed.type = "text/javascript";
            scriptErrorSuppressed.text = "function onClick(){ alert(‘添加js‘); }";
            IHTMLElementCollection nodes = doc.getElementsByTagName("head");
            foreach (IHTMLElement elem in nodes)
            {
                var head = (HTMLHeadElement)elem;
                head.appendChild((IHTMLDOMNode)scriptErrorSuppressed);
            }
            //5.2 删除JS
            IHTMLElementCollection scripts = (IHTMLElementCollection)doc.getElementsByName("script");
            foreach (IHTMLElement node in scripts)
            {
                if (!(node is IHTMLUnknownElement))
                {
                    IHTMLScriptElement script = node as IHTMLScriptElement;
                    //删除所有js文件引用
                    if (string.IsNullOrEmpty(script.text))
                    {
                        IHTMLDOMNode remove = script as IHTMLDOMNode;
                        remove.parentNode.removeChild(remove);
                    }
                }
            }

            //6、write new html
            mshtml.IHTMLDocument2 doc2 = this.webBrowser.Document as mshtml.IHTMLDocument2;
            doc2.clear();
            doc2.writeln("<HTML><BODY>write new html</BODY></HTML>");

     public MainWindow()
        {
            InitializeComponent();
            this.webBrowser.ObjectForScripting = new ScriptEvent();
            this.webBrowser.NavigateToString(@"<html><head><title>Test</title></head><body><input type=""button"" value=""点击"" onclick=""window.external.ShowMessage(‘百度一下‘);"" /></body></html>");
        }

    [System.Runtime.InteropServices.ComVisible(true)]
    public class ScriptEvent
    {
        //供JS调用
        public void ShowMessage(string message)
        {
            MessageBox.Show(message);
        }
    }