当c#中浏览器的复选框被选中时引发事件

本文关键字：事件 复选框 浏览器 | 更新日期: 2023-09-27 18:12:01

我想在web浏览器中选中复选框时引发一个事件。以下是我想出来的:

   public class HTMLCheckBoxArgs : EventArgs
   {
      public Guid ElementGuid;
   }
    public delegate void CheckBoxChangeEventHandler(object sender, HTMLCheckBoxArgs e);
    public event CheckBoxChangeEventHandler CheckPressed;
    void OnCheckPressed(HTMLCheckBoxArgs args)
    {
        if (CheckPressed != null)
            CheckPressed(this, args);
    }
    protected void CheckBoxEvents() 
    {
        HtmlElementCollection elements = webBrowser1.Document.GetElementsByTagName("input");
        foreach (HtmlElement el in elements)
        {
            HTMLCheckBoxArgs checkbargs = new HTMLCheckBoxArgs();
            if (el.GetAttribute("type") == "checkbox")
            {
                    checkbargs.ElementGuid = Guid.Parse(el.Id);
                    el.AttachEventHandler("onclick", (sender, args) => OnCheckBoxClicked(el, checkbargs));
            }
        }
    }
    public void OnCheckBoxClicked(object sender, EventArgs args)
    {
        OnCheckPressed((HTMLCheckBoxArgs)args);
    }

我遇到的问题是，这种方式在单击复选框时引发事件。我希望当复选框被选中时引发该事件

当c#中浏览器的复选框被选中时引发事件

试试这个:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
    }
    private void Form1_Load(object sender, EventArgs e)
    {
        webBrowser1.DocumentText = "<html><body><input type='"checkbox'" id='"chk'" value='"some'">some thing</body></html>";
    }
    void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        foreach (HtmlElement el in webBrowser1.Document.All)
        {
            if (el.GetAttribute("type") == "checkbox")
            {
                el.AttachEventHandler("onclick", (send, args) => OnElementClicked(el, EventArgs.Empty));
            }
        }
    }
    private object OnElementClicked(HtmlElement el, EventArgs eventArgs)
    {
        if (el.GetAttribute("checked") == "True")
        {
            MessageBox.Show("checked");
        }
        return false;
    }
}
相关文章：