Webbrowser点击具有OnClick属性的链接 [英] Webbrowser click on link with OnClick attribute

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问题描述

假设我有以下HTML：

 < div id =active_server> 
< div class =clearfix> 
< a href =＃onclick =return Index.submit_login（'server_nlp1'）;> 
< span class =world_button_active>服务器NL P1< / span> 
< / a> 
< a href =＃onclick =return Index.submit_login（'server_nlp2'）;> 
< span class =world_button_active>服务器NL P2< / span> 
< / a> 
< / div> 
< / div>

现在假设我想模拟点击服务器NL P2。我知道我必须得到的HTML。所以首先得到div像这样：

  HtmlElement active_server = webBrowser1.Document.GetElementById（active_server）。GetElementsByTagName div）[0];但是我的问题如下：
 
 
 p>如何循环遍历元素和搜索 Onclick  wich链接我必须点击（注意，onclick的变量，所以我不能做索引和点击或类似的东西，我真的需要比较onclick或文本在span）
 
 
 
我是这种类型的编程的新手。 p> 
 
 
 编辑1  
我真的不知道什么地方的元素是因为它可以改变（有时有更多的服务器，我必须找到正确的服务器...）
 
 
 
 编辑2  
 
 
 
 HTML如下所示：
 < div id =active_server> 
< p class =pseudo-heading> Op welke wereld wil je je aanmelden？< / p> 
< div class =clearfix> 
< a href =＃onclick =return Index.submit_login（'server_nl33'）;> 
< span class =world_button_active> Wereld 33< / span> 
< / a> 
< a href =＃onclick =return Index.submit_login（'server_nlp1'）;> 
< span class =world_button_active>休闲< / span> 
< / a> 
< / div> 
 
< div class =clearfix> 
< a href =＃onclick =return Index.submit_login（'server_nl34'）;> 
< span class =world_button_inactive> Wereld 34< / span> 
< / a> 
< / div> 
 
< p class =pseudo-headingid =show_all_server> 
< a href =＃onclick =$（'＃show_all_server'）。hide（）; $（'＃inactive_server_list'）。show（）; return false> Toon alle hadlden< / a> ; 
< / p> 
< / div> 
  
 
 
解决方案
我的猜测： code> A 链接点击包含在该链接内部 SPAN 中的文本。
 
 
 
试试这个：
  HtmlElement active_server = webBrowser1.Document.GetElementById（active_server）。GetElementsByTagName div）[0]; 
 HtmlElement link = null; 
 if（FindLinkToClick（active_server，Server NL P1，ref link）
 {
 link.InvokeMember（click，null）; 
} 
 
 // FindLinkToClick 
 
 bool FindLinkToClick（HtmlElement root，string text，ref HtmlElement found）
 {
 foreach（root.hildren中的var child）
 {
 var element =（HtmlElement）child; 
 if（element.InnerText == text）
 {
 found = element.Parent; 
 return true; 
 } 
 if（FindLinkToClick（element，text，ref found））
 return true; 
} 
 return false; 
} 
  
 
 
 
    
 
 
 
您要查找的字符串（例如，Server NL P1）是唯一的，您只需使用 webBrowser1.WB.Document.Body 作为 root 搜索：
  HtmlElement link = null; 
 if（FindBrowser1 .WB.Document.Body，Server NL P1，ref link））
 {
 link.InvokeMember（click，null）; 
} 
  
    
 $ b 
我只是用下面的HTML测试它，它的工作原理。注意< a href =＃onclick =alert（'clicked！'）> ，我看到点击！警报。 
 < div id =active_server> 
< p class =pseudo-heading> Op welke wereld wil je je aanmelden？< / p> 
< div class =clearfix> 
< a href =＃onclick =alert（'clicked！'）> 
< span class =world_button_active> Wereld 33< / span> 
< / a> 
< a href =＃onclick =return Index.submit_login（'server_nlp1'）;> 
< span class =world_button_active>休闲< / span> 
< / a> 
< / div> 
 
< div class =clearfix> 
< a href =＃onclick =return Index.submit_login（'server_nl34'）;> 
< span class =world_button_inactive> Wereld 34< / span> 
< / a> 
< / div> 
< / div> 
  
我这样调用：
  HtmlElement link = null; 
 if（FindLinkToClick（this.webBrowser1.Document.Body，Wereld 33，ref link））
 link.InvokeMember（click，null）; 
  
  [UPDATE]  
 
 
 
代码可以使用您提供的链接进行修改。也许，你需要确保文档完全加载，如下所示：
  bool _loaded = false; 
 
 public Form1（）
 {
 InitializeComponent（）; 
 
 this.WB.DocumentCompleted + = WB_DocumentCompleted; 
} 
 
 void WB_DocumentCompleted（object sender，WebBrowserDocumentCompletedEventArgs e）
 {
 if（_loaded）
 return; 
 _loaded = true; 
 
 HtmlElement link = null; 
 if（FindLinkToClick（this.WB.Document.Body，Wereld 33，ref link））
 {
 link.InvokeMember（click，null）; 
} 
} 
 
 void Form1_Load（object sender，EventArgs e）
 {
 this.WB.Navigate（@http：// scriptsenprogs。 nl / twmc.html）; 
} 
  
 
Let's say that I've got the following HTML:
<div id="active_server">
    <div class="clearfix">
        <a href="#" onclick="return Index.submit_login('server_nlp1');">
                <span class="world_button_active">Server NL P1</span>
            </a>
        <a href="#" onclick="return Index.submit_login('server_nlp2');">
                <span class="world_button_active">Server NL P2</span>
            </a>
    </div>
</div>

Now let's say that i want to simulate an click on server NL P2. I know that I've got to get the HTML. so first i get the div like this:
HtmlElement active_server = webBrowser1.Document.GetElementById("active_server").GetElementsByTagName("div")[0];

But then is my question as follow: 



How do i loop through the elements and search in the Onclick wich link I've got to click ( note, the onclick's are variable, so i can't do an index and click or something like that. I really need to compare the onclick or the text in the span)



I'm very new to this type of programming.



EDIT 1
I don't really know on what place the element is because it can change ( sometimes there are more servers, and i've got to find the right server...) 



EDIT 2



The HTML looks like this:
<div id="active_server">
    <p class="pseudo-heading">Op welke wereld wil je je aanmelden?</p>
    <div class="clearfix">
        <a href="#" onclick="return Index.submit_login('server_nl33');">
        <span class="world_button_active">Wereld 33</span>
        </a>
        <a href="#" onclick="return Index.submit_login('server_nlp1');">
        <span class="world_button_active">Casual</span>
        </a>
    </div>

    <div class="clearfix">
        <a href="#" onclick="return Index.submit_login('server_nl34');">
        <span class="world_button_inactive">Wereld 34</span>
        </a>
    </div>

    <p class="pseudo-heading" id="show_all_server">
        <a href="#" onclick="$('#show_all_server').hide();$('#inactive_server_list').show();return false">Toon alle werelden</a>
    </p>
</div>



 解决方案 
My guess: you're trying to find what A link to click by the text, contained in the inner SPAN of that link.



Try this:
HtmlElement active_server = webBrowser1.Document.GetElementById("active_server").GetElementsByTagName("div")[0];
HtmlElement link = null;
if (FindLinkToClick(active_server, "Server NL P1", ref link)
{
  link.InvokeMember("click", null);
}

// FindLinkToClick

bool FindLinkToClick(HtmlElement root, string text, ref HtmlElement found)
{
    foreach (var child in root.Children)
    {
        var element = (HtmlElement)child;
        if (element.InnerText == text) 
        {
            found = element.Parent;
            return true;
        }
        if (FindLinkToClick(element, text, ref found))
            return true;
    }
    return false;
}

[EDITED]



If you're sure the string you're looking for (e.g, "Server NL P1") is unique, you can just use webBrowser1.WB.Document.Body as the root for search:
HtmlElement link = null;
if (FindLinkToClick(webBrowser1.WB.Document.Body, "Server NL P1", ref link))
{
  link.InvokeMember("click", null);
}

[EDITED]



I just tested it with the below HTML and it works. Note <a href="#" onclick="alert('clicked!')">, I do see that "clicked!" alert. 
<div id="active_server">
    <p class="pseudo-heading">Op welke wereld wil je je aanmelden?</p>
    <div class="clearfix">
        <a href="#" onclick="alert('clicked!')">
        <span class="world_button_active">Wereld 33</span>
        </a>
        <a href="#" onclick="return Index.submit_login('server_nlp1');">
        <span class="world_button_active">Casual</span>
        </a>
    </div>

    <div class="clearfix">
        <a href="#" onclick="return Index.submit_login('server_nl34');">
        <span class="world_button_inactive">Wereld 34</span>
        </a>
    </div>
</div>

I call it like this:
HtmlElement link = null;
if (FindLinkToClick(this.webBrowser1.Document.Body, "Wereld 33", ref link))
  link.InvokeMember("click", null);

[UPDATE]



The code works unmodified with the link your provided. Maybe, you need to make sure the document is fully loaded, like this:
bool _loaded = false;

public Form1()
{
    InitializeComponent();

    this.WB.DocumentCompleted += WB_DocumentCompleted;
}

void WB_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    if (_loaded)
        return;
    _loaded = true;

    HtmlElement link = null;
    if (FindLinkToClick(this.WB.Document.Body, "Wereld 33", ref link))
    {
      link.InvokeMember("click", null);
    }
}

void Form1_Load(object sender, EventArgs e)
{
    this.WB.Navigate(@"http://scriptsenprogs.nl/twmc.html");
}



                        
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