Question

我希望我的浏览器（GeckoFX）在点击我的网页中的按钮时执行.NET功能。我有以下代码：

public Form1()
{
   InitializeComponent();

   AddMessageEventListener("myFunction", ((string s) => this.showMessage(s)));

   browser.LoadHtml
   (
       @"<!DOCTYPE html>
             <html><head>
             <meta http-equiv=""Content-Type"" content=""text/html; charset=UTF-8"">
             <script type=""text/javascript"">
                function fireEvent(name, data)
                {
                   event = document.createEvent('MessageEvent');
                   event.initMessageEvent(name, false, false, data, null, null, null, null);
                   document.dispatchEvent(event);
                }
             </script>
             </head>
             <body>fdsfsda
                <input type=""button"" onclick=""fireEvent('myFunction', 'some data');"" value=""SHOW DATA"" />
             </body></html>"
   );
}

public void AddMessageEventListener(string eventName, Action<string> action)
{
   browser.AddMessageEventListener(eventName, action);
}

private void showMessage(string s)
{
   MessageBox.Show(s);
}

但是在运行该代码时，行

browser.AddMessageEventListener(eventName, action);

给我一个'对象引用未设置为对象的实例'错误。我不明白，因为我已经检查了该行中的所有对象都已初始化。有人可以帮忙告诉我为什么会收到这个错误吗？

非常感谢！

Answer 1

您可以尝试不同的方法。订阅browser.DomClick事件 - 只要点击某些内容就会触发它。从那里，您可以过滤掉无趣的点击，只在点击所需元素时调用更多代码。

Browser.DomClick += browser_DomClick;

然后

private void browser_DomClick(object sender, DomMouseEventArgs e)
        {
            var browser = sender as GeckoWebBrowser;

            if (sender != null && e != null && e.Target != null)
            {
                if (e.Button == GeckoMouseButton.Left)
                {
                    HandleLeftClick(e);
                }
                if (e.Button == GeckoMouseButton.Middle)
                {
                    HandleMiddleClick(e);
                }
                if (e.Button == GeckoMouseButton.Right)
                {
                    HandleRightClick(e);
                }
            }
        }

Answer 2

尝试在 LoadHtml 之后添加 AddMessageEventListener ，如下所示：

browser.LoadHtml(@"<!DOCTYPE html>.....</html>");

AddMessageEventListener("myFunction", ((string s) => this.showMessage(s)));

并在LoadHtml中更改此行：

event = document.createEvent('MessageEvent');
event.initMessageEvent(name, false, false, data, null, null, null, null);

由此：

var event = new MessageEvent(name,{'view': window, 'bubbles': false, 'cancelable': false, 'data': data});

您的新代码如下：

public Form1()
{
   InitializeComponent();

   browser.LoadHtml
   (
       @"<!DOCTYPE html>
             <html><head>
             <meta http-equiv=""Content-Type"" content=""text/html; charset=UTF-8"">
             <script type=""text/javascript"">
                function fireEvent(name, data)
                {
                   var event = new MessageEvent(name,{'view': window, 'bubbles': false, 'cancelable': false, 'data': data});
                   document.dispatchEvent(event);
                }
             </script>
             </head>
             <body>fdsfsda
                <input type=""button"" onclick=""fireEvent('myFunction', 'some data');"" value=""SHOW DATA"" />
             </body></html>"
   );

   AddMessageEventListener("myFunction", ((string s) => this.showMessage(s)));
}

private void showMessage(string s)
{
   MessageBox.Show(s);
}

Answer 3

//这对我有用

public Form1()
{
    InitializeComponent();
    m_wb = new Gecko.GeckoWebBrowser();
    m_wb.Dock = DockStyle.Fill;
    //m_wb.AddMessageEventListener("func1", onFunc1);  ->not work
    this.Controls.Add(m_wb);
    this.Load += Form1_Load;

private void Form1_Load(object sender, EventArgs e)
    {
        m_wb.LoadHtml(@"<!DOCTYPE html>
         <html><head>
         <meta http-equiv=""Content-Type"" content=""text/html; charset=UTF-8"">
         <script type=""text/javascript"">
            function fireEvent(name, data)
            {
               var event = new MessageEvent(name,{'view': window, 'bubbles': false, 'cancelable': false, 'data': data});
               document.dispatchEvent(event);
            }
         </script>
         </head>
         <body>fdsfsda
            <input type=""button"" onclick=""fireEvent('myFunction', 'some data');"" value=""SHOW DATA"" />
         </body></html>"
        );

        m_wb.AddMessageEventListener("myFunction", ((string s) => MessageBox.Show(s)));

GeckoFX上的“AddMessageEventListener”出错

3 个答案: