Determine if document has changed

[Jeff Clark]

Is there an easy way to determine if the open document has any changes?

I want to prompt the user to see if they want to save the document when they try to close the document or open a new one, but only if the document has changed.

Thanks.

[Stefan]

Hello Jeff,

Thank you for writing.

You can determine whether a document has been changed by subscribing to the DocumentContentChanged event of the desired document.

I hope that you find this information helpful. Should you have any other questions, do not hesitate to contact us.
 
All the best,
Stefan
the Telerik team

[Jeff Clark]

Thanks for the reply.

I created an event hanlder as follows:

Form Constructor

public frmEditEmail()
{
    InitializeComponent();
    radRichTextBox1.Document.DocumentContentChanged += new EventHandler(Document_DocumentContentChanged);
}

Event Handler

void Document_DocumentContentChanged(object sender, EventArgs e)
{
    emailTextChanged = true;
    MessageBox.Show("DocumentContentChanged");
}

But the event handler is not firing when changes are made in the document. What am I doing wrong?  Thanks.

[Stefan]

Hello Jeff,

Thank you for writing.

I have tested this scenario and on my end it behaves correctly. A possible reason for which the event does not fire is if the document does not exist in the form's constructor. This is why, I would recommend that you subscribe to the event in the form Shown event (refer to the attached video). If this still does not work for you, please provide me with a sample project demonstrating the issue, so I can investigate it locally and provide you with adequate support.

I am looking forward to your reply.

All the best,
Stefan
the Telerik team

[Jeff Clark]

Thanks. Subscribing to the event in the Shown event didn't work, but that is because I haven't assigned a document to the RadRichText control yet.  I subscribed to the event right after assigning a document to the control and now it is working.
Thanks for your help.