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I'm using a WebBrowser control in design mode.
webBrowser1.DocumentText = "<html><body></body></html>";
doc = webBrowser1.Document.DomDocument as IHTMLDocument2;
doc.designMode = "On";
I have a save button that I would like to enable or disable depending on whether the contents of the control have changed.
I also need to know when the contents of the control have changed as I need to stop the user from navigating away from the control without accepting a confirmation message box stating that their changes will be lost.
I can't find any events that would let me know that the contents have changed.
366
There is no such event since DocumentText is a simple string. I would create a string variable storing the last saved text and check it at each KeyDown / MouseDown / Navigating event.
string lastSaved;
private void Form_Load(object sender, System.EventArgs e)
{
// Load the form then save WebBrowser text
this.lastSaved = this.webBrowser1.DocumentText;
}
private void webBrowser1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
// Check if it changed
if (this.lastSaved != this.webBrowser1.DocumentText)
{
// TODO: changed, enable save button
this.lastSaved = this.webBrowser1.DocumentText;
}
}
private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
// Check if it changed
if (this.lastSaved != this.webBrowser1.DocumentText)
{
// TODO: ask user if he wants to save
// You can set e.Cancel = true to cancel loading the next page
}
}
QueryInterface() the document for IMarkupContainer2, then call IMarkupContainer2::RegisterForDirtyRange with your own implementation of IHTMLChangeSink. Your IHTMLChangeSink::Notify implementation will be called when a change is made.
Note: Do this after you set the design mode. The document gets reloaded and event hook get lost, if you toggle the design mode.
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