[英]Raising event when the checkbox of a webbrowser is checked in C#
I want to raise an event when the checkbox is checked in a web browser. 我想在网络浏览器中选中复选框时引发事件。 Here is what I have come up with: 这是我想出的:
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);
}
The problem that I have is the fact that this way I raise the event when the check box is clicked. 我遇到的问题是,当我单击复选框时,我以这种方式引发事件。 I want the event to be raised when the check box is checked. 我希望在选中复选框时引发事件。
Try this: 尝试这个:
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;
}
}
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