IHTMLDOMNode的删除操作

2011-08-11 08:56:02 236 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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环境：VS2005 C# WinForm IE8

当网页加载完后，我遍历网页的DOM树，找到position属性为fixed的div节点。如果该节点下还包括img、object或iframe节点，就删除掉div节点。用处你们懂的--过滤右下角和两侧广告。

为稳妥起见，我使用IE的开发人员工具做为参考。运行结果是，符合要求的div标签被捕获到了，然后调用IHTMLDOMNode的removeNode（true）删除。

让我不解的是，有些网站的广告div过滤掉了，有些则不行。换成parentNode.removeChild(node)--如果有父结点，也删不掉。比如说金山在线翻译，你查询一个单词后，右下角会出来一个广告窗口。网页比较简单，用IE开发人员工具一看，那个广告div一目了然，也就是说不可能存在我捕获错误的情况。我确实捕获到了那个div，而且，removeNode没有返回null，说明执行成功了，但广告div就是不消失。

请指教



        private void button2_Click(object sender, EventArgs e)//点击按钮进行过滤测试

        {

            IHTMLDocument3 HTMLDocument = (IHTMLDocument3)this.webBrowser1.Document.DomDocument;

            IHTMLDOMNode rootDomNode = (IHTMLDOMNode)HTMLDocument.documentElement;

            IHTMLDOMNode bodyNode = null;



            if (rootDomNode.hasChildNodes())

            {

                IHTMLDOMChildrenCollection allchild = (IHTMLDOMChildrenCollection)rootDomNode.childNodes;

                int length = allchild.length;

                for (int i = 0; i < length; i++)

                {

                    IHTMLDOMNode child_node = (IHTMLDOMNode)allchild.item(i);

                    if (string.Equals(child_node.nodeName,"body",StringComparison.OrdinalIgnoreCase))

                    {

                        bodyNode = child_node;

                        break;

                    }

                }

            }



            ArrayList del = new ArrayList();



            if (bodyNode != null && bodyNode.hasChildNodes())

            {

                IHTMLDOMChildrenCollection allchild = (IHTMLDOMChildrenCollection)bodyNode.childNodes;

                int length = allchild.length;

                for (int i = 0; i < length; i++)

                {

                    IHTMLDOMNode child_node = (IHTMLDOMNode)allchild.item(i);

                    if (string.Equals(child_node.nodeName, "div", StringComparison.OrdinalIgnoreCase))

                    {

                        IHTMLDOMNode fix = GetFixedDiv(child_node);



                        if(fix != null)

                        {

                            if (NeedFilter(fix))

                            { del.Add(fix); }

                        }

                    }

                }



                for (int i = 0; i < del.Count;++i )

                {

                    IHTMLDOMNode node = (IHTMLDOMNode)del[i];

                    if (node.hasChildNodes())

                    {

                        IHTMLDOMChildrenCollection allchild0 = (IHTMLDOMChildrenCollection)node.childNodes;

                        int length0 = allchild0.length;



                        for (int j = 0; j < length0; j++)

                        {

                            IHTMLDOMNode child_node = (IHTMLDOMNode)allchild.item(j);

                            child_node.removeNode(true);

                        }

                    }



                    //if(node.parentNode != null)

                    //{ node.parentNode.removeChild(node); }



                    node.removeNode(true);

                }

            }

        }



        private IHTMLDOMNode GetFixedDiv(IHTMLDOMNode div)

        {

            if(div != null)

            {

                IHTMLStyle style = ((IHTMLElement)div).style;

                if (string.Equals("fixed", style.position, StringComparison.OrdinalIgnoreCase))

                {

                    return div;

                }



                if (div.hasChildNodes())

                {

                    IHTMLDOMChildrenCollection allchild = (IHTMLDOMChildrenCollection)div.childNodes;

                    int length = allchild.length;



                    for (int i = 0; i < length; i++)

                    {

                        IHTMLDOMNode child_node = (IHTMLDOMNode)allchild.item(i);

                        if (string.Equals(child_node.nodeName, "div", StringComparison.OrdinalIgnoreCase))

                        {

                            IHTMLDOMNode re = GetFixedDiv(child_node);

                            if(re != null)

                            { return re; }

                        }

                    }

                }

            }

            return null;

        }



        private bool NeedFilter(IHTMLDOMNode node)

        {

            if (node != null && node.hasChildNodes())

            {

                //this.textBox1.Text += "\n\n";



                IHTMLDOMChildrenCollection allchild = (IHTMLDOMChildrenCollection)node.childNodes;

                int length = allchild.length;

                for (int i = 0; i < length; i++)

                {

                    IHTMLDOMNode child_node = (IHTMLDOMNode)allchild.item(i);

                    //this.textBox1.Text += (child_node.nodeName + "\n");



                    if (string.Equals(child_node.nodeName, "img", StringComparison.OrdinalIgnoreCase) ||

                        string.Equals(child_node.nodeName, "object", StringComparison.OrdinalIgnoreCase) ||

                        string.Equals(child_node.nodeName, "iframe", StringComparison.OrdinalIgnoreCase))

                    {

                        return true;

                    }



                    if (NeedFilter(child_node))

                    { return true; }

                }

            }

            return false; 

        }