?
Solved

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

Posted on 2016-11-22
9
Medium Priority
?
109 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 37

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
The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

 
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

The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction Hi all and welcome to my first article on Experts Exchange. A while ago, someone asked me if i could do some tutorials on object oriented programming. I decided to do them on C#. Now you may ask me, why's that? Well, one of the re…
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
The video provides a quick and easy steps to migrate MBOX file to well known Outlook PST and Office 365. Besides this, it also supports and migrates more than 20 email clients of MBOX which include AppleMail, Opera, Thunderbird and SeaMonkey effortl…
Free Data Recovery software is an advanced solution from Kernel Tools to recover data and files such as documents, emails, database, media and pictures, etc. It supports recovery from physical & logical drive after a hard disk crash, accidental/inte…
Suggested Courses
Course of the Month6 days, 16 hours left to enroll

592 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