C#的WEBBROWSER与JS交互小结

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

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

<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

//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>");

2、数据交互

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);
    }
}

希望本文所述对大家的c#程序设计有所帮助。