the textbox is associated with two RequiredFiled validators
also this textbox has TextChanged event.
I would like to allow first execute RequiredFiled validators then execute Textchanged event.
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
if (!System.Text.RegularExpressions.Regex.IsMatch(TextBox1.Text,Regular_Expression))
{
Label2.Text = "from textChanged.";
}
}
if (!System.Text.RegularExpressions.Regex.IsMatch(TextBox1.Text,Regular_Expression))
here how to use regular expression with (requiedfiled, regularExpression controls)?
Can someone help me how to use RequiredFiled controls with text-box?
Actually, this script is for first validate required filed controls then execute textbox_Textchanged event. because the movement when the filled value in textbox, textbox change event is firing, so OOB(out of the box) control is not executing properly. to execute textbox required filed OOB control if the value is valid then textbox_TextChanged event should execute. just googled and find the
Regex.IsMatch(textbox,RegularExepression) but don't know how to use Regular
Expressions.
Related
I want method to run (event to occur) while i am typing something in textbox ( i dont want to click button) for example i have a a textbox and a listbox in a same form and while i am writing text in textbox it should simultaneously print that in listbox without clicking an button
use Text Changed event for your textbox
Text Changed event
Utilize the TextBox control's TextChanged event.
This event is raised if the Text property is changed by either a programmatic modification or user interaction.
For more information about handling events, see Handling and Raising Events.
You can access it through the properties list, or you can create it at Initialize or Form_Load or even in the Form constructor using:
textBox1.TextChanged += textBox1_TextChanged;
private void textBox1_TextChanged(object sender, EventArgs e) { }
I have 2 controls on a Form, and I want that whilst I'm entering text in 1 control, the same text is entered in the 2 control immediately.
I've tried the following events:
KeyDown,
KeyPress,
KeyUp,
PreviewKeyDown
But they all have the same effect, ie. the second control is one character behind. These controls are bound to a bindingsource.
Is there any other event that I can use or is there any other way to do this?
EDIT:
I just saw the TextChanged event.
You can use TextChanged event. Define this event for your first control say text box, and in this event, set the text of your second control.
private void textBox1_TextChanged(object sender, EventArgs e)
{
this.textBox2.Text = ((TextBox)sender).Text;
}
I would like to validate my textbox when the textbox is deselected.
It should validate the textbox value in the same way as Google's Create Account page.
If the textbox value passes validation it should proceed further otherwise it should show message like: This value is not valid.
Events of Validation And LostFocus can be you here.
Here is some code for validate textbox value
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.lostfocus.aspx
if its a desktop app/WinForms u can use what Suspitsyn Kirill said, and for a web app it would be quite close.
The textbox has event handlers for on focus etc. using the code behind you can assign what the events will do.
Dont remember the C# ones exactly but it should be
private void textBox1_LostFocus(object sender, System.EventArgs e)
{
textBox1_Validating()
}
add the lostfocus on the element to direct to this method.
You could also do it with javascript same concept.
Is there any event that fire when the value of the textbox change from a peace of code and when the textbox is validated or lost the focus and the event don't fire on the key press,because I have a lot of calculation and It's not possible to do it on every key press
Use TextChanged for text changed.
Use LostFocus for when textbox looses focus.
Use Validating or Validated for validation.
Here is the order in which events are called for TextBox:
// Reference : http://msdn.microsoft.com/en-us/library/system.windows.forms.control.validated.aspx
1) Enter
2) GotFocus
3) Leave
4) Validating
5) Validated
6) LostFocus
This should help you decide where you want to put your code.
There's no event that will fulfill your requirement of being raised when the textbox's value is changed programmatically through code, but not when text is typed into it by the user. The TextChanged event is going to be raised either way (this is fairly intuitive—the text value is changing, and the computer doesn't know or care what is responsible for changing it). As the documentation for this event indicates:
User input or setting the Text property to a new value raises the TextChanged event.
If you need to run custom validation logic when you add text to your textbox in code, you will need to invoke whatever method contains the validation logic yourself. Extract it into a separate method, which you call from the Validating/Validated event handler and from all of the places in your code where you set the textbox's Text property.
As a supplement to the other answers that have already been posted, I strongly recommend using either the Validating (if you want to be able to cancel the validation) or Validated events to handle the textbox losing focus, rather than the somewhat more obviously named LostFocus event.
You can use the LostFocus or Validated events.
Use a member variable.
private bool _changeByCode;
public void DoSomeChanges()
{
_changeByCode = true;
textbox1.Text = "Hello";
_changeByCode = false;
}
public void Textbox1_Change(object source, EventArgs e)
{
if (_changeByCode)
return;
//do your validation here.
}
In WinForms I could handle the Validated event to do something after the user changed text in a TextBox. Unlike TextChanged, Validated didn't fire for every character change; it only fired when the user was done.
Is there anything in WPF I can use to get the same result, an event raised only after the user is done changing the text?
LostFocus will fire when the user moves from your textbox onto any other control.
It seems that there is no native solution.
The LostFocus event is a good idea. But when the user click on Enter, he wants the TextBox to validate the change.
So here is my suggestion : use the LostFocus event and the KeyDown event when the key is Enter.
private void TextBox_LostFocus(object sender, RoutedEventArgs e)
{
// code to lauch after validation
}
private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{
// call the LostFocus event to validate the TextBox
((TextBox)sender).RaiseEvent(new RoutedEventArgs(TextBox.LostFocusEvent));
}
}
LostFocus is not equivalent to Validate. It creates lots of problem when you have multiple text boxes on one screen and every text box has some logic written in Validate. In validate event you can control focus easily but not in LostFocus so easily.
You can also try Binding.ValidationRules
Documented at : http://msdn.microsoft.com/en-us/library/system.windows.data.binding.validationrules.aspx
Here is the article to get started:
How to implement binding validations :
http://msdn.microsoft.com/en-us/library/ms753962.aspx