Improve company productivity with a Business Account.Sign Up

x
?
Solved

c# find out if selected(highlighted) text in textbox was replaced or removed

Posted on 2016-11-22
9
Medium Priority
?
111 Views
Last Modified: 2016-11-22
If user selected some text in textbox and then removed or replaced, how to determine than selected word was removed(replaced)
0
Comment
Question by:ybt
9 Comments
 
LVL 38

Expert Comment

by:ste5an
ID: 41898027
When this is all information you've got: Then there is no way.

The normal approach would be comparing the old value with the current value. Which means that you store old value in some variable and compare this variable with the current content.
0
 
LVL 30

Expert Comment

by:anarki_jimbel
ID: 41898029
First, is it in winform or ASP?

Second: a) find out if something was selected, e.g.
private void textBox_KeyUp(object sender, KeyEventArgs e) {
    if (textBox.SelectedText != "")
        MessageBox.Show("Selected");
}

Open in new window


b) e.g., compare text before and after...
0
 

Author Comment

by:ybt
ID: 41898040
This is winform and  textBox.SelectedText != "" is not helpful, because user can unselect this text and there is nothing to check.
0
Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

 
LVL 30

Expert Comment

by:anarki_jimbel
ID: 41898059
Compare with previous content - that's what Stefan and I told you already.
0
 

Author Comment

by:ybt
ID: 41898090
Compare function gives only if strings equal or not
0
 
LVL 30

Accepted Solution

by:
anarki_jimbel earned 2000 total points
ID: 41898110
OK, I will try to explain possible algorithm...

1. You detected that something was selected in a text box - save current content.
2. Then you do some operation, e.g., click "Delete" or Right arrow,  - selection gone. Compare new text in the textbox and saved version.

Try something like:

        private void textBox1_KeyUp(object sender, KeyEventArgs e)
        {
            if (textBox1.SelectedText != string.Empty)
            {
                _textBoxContent = this.textBox1.Text;
                System.Diagnostics.Debug.WriteLine("case ak");
            }
            else if (!_textBoxContent.Equals(string.Empty) )
            {
                System.Diagnostics.Debug.WriteLine("case bk");
                if (!textBox1.Text.Equals(_textBoxContent))
                {
                    MessageBox.Show("Changed");
                }
                else
                {
                    MessageBox.Show("Same");
                }
                _textBoxContent = string.Empty;
            }
            else
            {
                _textBoxContent = string.Empty;
                System.Diagnostics.Debug.WriteLine("case else k");
            }
        }

Open in new window


Note: code might need adjustments
0
 
LVL 22

Expert Comment

by:Tapan Pattanaik
ID: 41898123
Hi ybt,

How is TextChanged Event !!

Occurs when the Text property value changes. It occurs when the text is modified in a TextBox. With it  make a program dependent on the value of a TextBox when the user types.

Regards,
Tapan Pattanaik
0
 
LVL 30

Expert Comment

by:anarki_jimbel
ID: 41898136
If you select text and then unselect your event won't be fired. You don't even know if something was selected.
However, this event could be used in conjunction with KeyUp etc.

Also, we need to remember that some operations can be done by a mouse, so we need to code mouse events as well...
0
 

Author Comment

by:ybt
ID: 41898166
Yes, algorithm is interesting and TextChanged Event I tried to use, not helpful.
Thank you
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Performance in games development is paramount: every microsecond counts to be able to do everything in less than 33ms (aiming at 16ms). C# foreach statement is one of the worst performance killers, and here I explain why.
This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
Watch the video to know how one can repair corrupt Exchange OST file effortlessly and convert OST emails to MS Outlook PST file format by using Kernel for OST to PST converter tool. It can convert OST to MSG, MBOX, EML to access them. It can migrate…
When you have multiple client accounts to manage, it often feels like there aren’t enough hours in the day. With too many applications to juggle, you can’t focus on your clients, much less your growing to-do list. But that doesn’t have to be the cas…

608 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question