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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already prophetic football prediction GitHub? Sign in to your account. I have an AppBarButton with the flyout assigned, and inside the flyout I have multiple text boxes.
These aren't editable inside the flyout, even though other things like check boxes work. How do we make these editable? It is required for docs.
Thanks jevansaksI think I was trying to do this for a demo project at work, don't remember what for specifically. So I'm no longer blocked as I'm not working on that anymore.
It'd be a nice feature to have, but I have no current application for it. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Sign up. New issue. Jump to bottom. TextBox input doesn't work inside a flyout. Copy link Quote reply. This comment has been minimized.In this article we describe how to implement validation of an object —typically an Entity, a Model, or a ViewModel instance- in a UWP app.
I built a small sample app to illustrate all of this. If one of these is selected, its details appear in the middle and we show an Edit button in the top right corner:. When the Edit button is clicked, an edit form pops open inside a content dialog. All fields of the ViewModel are editable.Input Validation C# Textbox Controls
At the bottom of the dialog there are some switches that indicate the state of the instance whether it was changed in the dialog, and whether it is valid and a button to reset all fields to their original value. If the object breaks any of the validation rules, then a list of errors appears at the bottom.
As long as there are validation errors, the Save button is disabled:. I think this is a quite common use case, especially in enterprise environments. I know it would have been easier to just reference the Template 10 Validation NuGet package. But I initially wanted to identify the smallest possible set of classes that cover my requirements and then make an old school Portable Class Library or a more modern.
NET Standard Library from it. Unfortunately that was too ambitious. Collection namespace which —as its name implies- is not platform independent. NET Standard version of the code, that could then be used in environments such as Xamarin…. I kept all the code as is, except for the JsonIgnore and NotMapped attributes on some properties. These were removed to further reduce dependencies. The core class is ValidatableModelBasewhich holds the default implementation for an editable data object that supports validation:.
Instances of this Model class are bound to the list at the left, and to the read-only details. Of course you also need to provide the validation logic.
The validation delegate typically iterates through a set of rules. Any validation rule that is not met by the instance, adds a message in the Errors collection of the corresponding property.
Here are some validation rules from the sample app:. Validations on a single field can be done in many ways with many frameworks, most of which rely on data annotation through validation attributes on the properties. I am not aware of a library that allows to compare the changed value of a field to its original value, except for the bloated self-tracking entities.
Nevertheless this is a requirement that I often encounter typically with counters and dates. I believe that the Template 10 Validation classes provide an excellent service in an elegant way and with minimal impact on your app. According to the dialogs and flyouts recommendationsa ContentDialog would be the ideal control for this in UWP. When the Edit button is clicked, you need to create the ViewModel from the currently selected Model.
You can use any kind of Mapper for this, or conversion operatorsor you can do it in a constructor like this:.
Of course you also need to provide the code to update the Model with the —validated- data when the Save button was pressed:. Validation checks are not restricted to edit forms. You could for example validate all the view models in the UI, to show your end users which objects need some attention. Just bind the IsValid property to an element in the data template, like in this example from the Template10 Validation sample app:.
That sample project also shows how to decorate the controls in the edit form with error indicators, like this:. This requires some extra behaviors and control templates from the NuGet package. My own sample app lives here on GitHub. You are commenting using your WordPress. You are commenting using your Google account.For more info, design guidance, and code examples, see Text box. This example shows a TextBox with a header and placeholder text.
The Text from the TextBox is used to show a greeting to the user. The TextBox control enables a user to enter text into an app. It's typically used to capture a single line of text, but can be configured to capture multiple lines of text. The text displays on the screen in a simple uniform plaintext format. You can use a TextBox control to display and edit unformatted text.
If you need an editable text box that accepts passwords or other sensitive input, see PasswordBox. If you need a text box to enter search terms, see AutoSuggestBox. If you need to enter or edit formatted text, see RichEditBox.
You typically use an event like a submit button Click to access the Text property, but you can handle the TextChanged or TextChanging event if you need to do something when the text changes. You can add a Header or label and PlaceholderText or watermark to the TextBox to give the user an indication of what the TextBox is for.
To customize the look of the header, you can set the HeaderTemplate property instead of Header. For design info, see Guidelines for labels.
You can restrict the number of characters the user can type by setting the MaxLength property. However, MaxLength does not restrict the length of pasted text.
Use the Paste event to modify pasted text if this is important for your app. TextBox includes a clear all button "x" that appears when text is entered in the box. When a user clicks the "x", the text in the TextBox is cleared.
It looks like this. The clear all button is shown only for editable, single-line text boxes that contain text and have focus. The clear all button is not shown in any of these cases:. For example, you might have a TextBox for a user to enter comments that is enabled only under certain conditions. You can make the TextBox read-only until the conditions are met.
Use the TextAlignment property to align text within a TextBox. While the TextBox supports only unformatted text, you can customize how the text is displayed in the TextBox to match your branding. These properties affect only how the TextBox displays the text locally, so if you were to copy and paste the text into a rich text control, for example, no formatting would be applied. This example shows a read-only TextBox with several properties set to customize the appearance of the text.
When a user taps into a text input box using a Windows pen, the text box transforms to let the user write directly into it with a pen, rather than opening a separate input panel. For more info, see Text input with the handwriting view. By default, the commands shown in the TextBox context menu depend on the state of the TextBox. For example, the following commands can be shown when the TextBox is editable.
Command Shown when Copy text is selected. Cut text is selected. Paste the clipboard contains text. Select all the TextBox contains text.The built-in TextBox control in UWP supports any textual input from the user, but in some cases, you might prefer to allow only plain numbers. In this article, I will show two different approaches which will allow you to do just that.
If we want to make sure no non-digit character can be entered in the TextBox we can use the BeforeTextChanging event.
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In the handler, we can use simple LINQ query to check if the input consists only of digits. In case we encounter any non-digit character we simply cancel the text change.
Instead of preventing non-digit input, we can instead just filter out the non-digit characters. In this case we can use the TextChanging eventwhich is exactly suited for this scenario, as docs say:. You typically handle this event to update the Text value and selection before the text is rendered.
This prevents the text flickering that can happen when text is rendered, updated, and re-rendered rapidly. And the event handler will again use LINQ to make the whole logic very clear and simple. We take all the newly updated Text property value and filter it to digits only.
They can be extended to support more general numeric input like decimals or to allow for separators between thousands. However, each culture has its own formatting rules, so it is usually more appropriate to set the TextBox. InputScope property to an appropriate value and then perform additional validation in code, using. NET built-in TryParse methods which can handle culture-specific formatting.
Data validation in UWP
I let the user type whatever she wants but I have validation rules and styling to let her know when something is wrong. Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email. This site uses Akismet to reduce spam. Learn how your comment data is processed.
Also I have tried on TextChanging this:. This LINQ expression will return true and hence Cancel the text change in case it encounters any non-digit character in the input. This LINQ query will filter out non-digit characters and create a new string only with the digits in the input. It is preferable to use TextChanging and BeforeTextChangingbecause TextChanged occurs too late, so the user would be confused by seeing characters temporarily display on the screen and immediately disappearing.
You can do something else instead of TextBox. Remove function which is Substring function and also you should fix it while they copy a series of characters which includes letters in the centre of the string Learn more.
TextBox with only numbers Ask Question. Asked 1 year, 6 months ago. Active 1 year ago. Viewed 3k times. IsMatch textBox1. Remove textBox1. Martin Zikmund CodeCaster This is absolutely not a duplicate. Thanks CodeCasterI have posted a full answer. Active Oldest Votes.
You can either prevent any non-numeric input whatsoever, or just filter out digits in the text.I want allow only to enter numeric values in a textbox in C. Can someone assist me on this. Sink the KeyDown event for the text box and you can cancel key presses if the character typed is not a digit. In fact, the documentation example for Control. KeyDown does exactly what you want. You are both going about it a really long way, and it will make the program slower.
Add a masked textbox, and set the mask to numeric only, or just add a numeric up-down. For any kind of complicated formatting, Edward still usually prefers manual parsing and formatting in a TextBox because the MaskedTextBox cannot handle simple jobs like trimming the value in a currency mask.
The code is harder to write and maintain, but the result is more professional and easier on users. The question was how to restrict input to numerics with a TextBox control, not the best way to take numeric input on a form.
I'm having a problem with starting with KeyPress event. The program is derecting me to the TextChanged event. How to change it to the KeyPress event. I'm sure the purists are howling, but I say Keep the TextChanged event. PS I personally hate the new Daniweb. It has so far thrown me out 3 times and I've resorted to using notepad so I can keep what I've typed when it throws me out again.
For validation purpose in your project at some places you put text boxes that accept only integer value i. To put validation on that text boxes and allow only integer value you can use ASP. Click Here to view example. Ap0ca1ypse's code is perfect for this purpos, but if you don't want to use these code because of troubling keypress Event "YOu Can Use this simple code for Text validation ". Why would s he care about suggestions now?
Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. So one input field has to be int s only, another one has to be format So 0 is an int from and then it auto has to add the : and allow two more ints. Learn more. Asked 2 years, 3 months ago. Active 2 years, 3 months ago. Viewed times. So it cant get filled with wrong data.
Is that possible and how? Robin Robin 1, 1 1 gold badge 12 12 silver badges 38 38 bronze badges. This stackoverflow.
Here's an example of a numeric textbox behaviour. Maybe it will give some inspiration to you. Active Oldest Votes. Equals "Back"? Select MyTextBox. Shubham Sahu Shubham Sahu 1, 1 1 gold badge 12 12 silver badges 29 29 bronze badges.
Is it also possible to 'limit' the amount of numbers? Robin looks like you are not copied my xaml code i already limit the number of characters to 5 inc. Robin are you get that MaxLength property in xaml? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Featured on Meta. Feedback on Q2 Community Roadmap.
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