C#的WEBBROWSER与JS交互小结

2019-10-29 21:46:00

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这篇文章主要介绍了C#的WEBBROWSER与JS交互方法,详细讲述了与页面标签的交互以及数据交互的方法,需要的朋友可以参考下

本文实例总结了C#的WEBBROWSER与JS交互的方法。分享给大家供大家参考。具体实现方法如下：

一、实现WebBrowser内部跳转，阻止默认打开IE

1、引用封装好的WebBrowserLinkSelf.dll实现

复制代码代码如下:

		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;
		       }
		}

2、引用com：Microsoft Internet Controls实现（参考MSDN：http://msdn.microsoft.com/en-us/library/system.windows.controls.webbrowser.aspx public partial class MainWindow : Window

复制代码代码如下:

		<em id="__mceDel">    {
		        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);
		        }
		    }
		</em>

二、WebBrowser与JS的交互

1、与页面标签的交互

复制代码代码如下:

		//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='#' style="border-left-color: rgb(0, 153, 204); border-left-width: 1px; border-left-style: solid; padding: 0px 3px; margin: 3px auto 0px; width: 640px; background-color: rgb(242, 246, 251); clear: both; border-top-color: rgb(0, 153, 204); border-top-width: 1px; border-top-style: solid; border-right-color: rgb(0, 153, 204); border-right-width: 1px; border-right-style: solid;">		复制代码代码如下:

		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);
		    }
		}