GeckoFx (3)使用 xpath 获取元素，生成 xpath 路径

分手后的思念是犯贱 2024-02-17 17:56 22阅读 0赞

生成 xpath 需要使用 DomClick 事件，获取选中的元素对象。以下两个生成 xpath 的方法

/// <summary>
    /// 获取短 xpath
    /// </summary>
    /// <param name="node"></param>
    /// <returns></returns>
    public string GetSmallXpath(GeckoNode node)
    {
    	if (node == null)
    		return "";
    	if (node.NodeType == NodeType.Attribute)
    	{
    		return String.Format("{0}/@{1}", GetSmallXpath(((GeckoAttribute)node).OwnerDocument), node.LocalName);
    	}
    	if (node.ParentNode == null)
    	{
    		return "";
    	}
    	string elementId = ((GeckoHtmlElement)node).Id;
    	if (!String.IsNullOrEmpty(elementId))
    	{
    		return String.Format("//*[@id=\"{0}\"]", elementId);
    	}
    	int indexInParent = 1;
    	GeckoNode siblingNode = node.PreviousSibling;
    	while (siblingNode != null)
    	{
    		if (siblingNode.LocalName == node.LocalName)
    		{
    			indexInParent++;
    		}
    		siblingNode = siblingNode.PreviousSibling;
    	}
    	return String.Format("{0}/{1}[{2}]", GetSmallXpath(node.ParentNode), node.LocalName, indexInParent);
    }
    /// <summary>
    /// 获取长xpath
    /// </summary>
    /// <param name="node"></param>
    /// <returns></returns>
    public string GetXpath(GeckoNode node)
    {
    	if (node == null)
    		return "";
    	if (node.NodeType == NodeType.Attribute)
    	{
    		return String.Format("{0}/@{1}", GetXpath(((GeckoAttribute)node).OwnerDocument), node.LocalName);
    	}
    	if (node.ParentNode == null)
    	{
    		return "";
    	}
    	int indexInParent = 1;
    	GeckoNode siblingNode = node.PreviousSibling;
    	while (siblingNode != null)
    	{
    		if (siblingNode.LocalName == node.LocalName)
    		{
    			indexInParent++;
    		}
    		siblingNode = siblingNode.PreviousSibling;
    	}
    	return String.Format("{0}/{1}[{2}]", GetXpath(node.ParentNode), node.LocalName, indexInParent);
    }

获得元素，生成 xpath

/// <summary>
    /// 文档单击事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void browser_DomClick(object sender, DomMouseEventArgs e)
    {
    	var ele = e.CurrentTarget.CastToGeckoElement();
    	ele = e.Target.CastToGeckoElement();
    	//短xpath
    	var xpath1 = GetSmallXpath(ele);
    	Msg("xpath1:" + xpath1);
    	//长xpath
    	var xpath2 = GetXpath(ele);
    }

使用 xpath 查找元素

/// <summary>
    /// 通过 xpath 查找元素,btnXpath button 的点击事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void btnXpath_Click(object sender, EventArgs e)
    {
    	if (string.IsNullOrWhiteSpace(_xpath))
    		return;
    	var xresult = browser.DomDocument.EvaluateXPath(_xpath);
    	var nodes = xresult.GetNodes();
    	var elements = nodes.Select(x => x as GeckoElement).ToArray();
    	var html = FindElement(elements);
    }
    //获得元素的 HTML 信息
    private string FindElement(params GeckoElement[] nodes)
    {
    	if (nodes == null)
    	{
    		return "无匹配项...";
    	}
    	var html="";
    	nodes.All(x =>
    	{
    		html = (x as GeckoHtmlElement).OuterHtml;
    		return false;
    	});
    	return html;
    }