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For example, when a two-way binding in the control for the username, validation of the entered data is performed.
For more information about behaviors, see Implementing Behaviors.
The e Shop On Containers mobile app notifies the user of any validation errors by highlighting the control that contains the invalid data with a red line, and by displaying an error message that informs the user why the data is invalid below the control containing the invalid data.
When the invalid data is corrected, the line changes to black and the error message is removed.
Figure 6-2 shows the Login View in the e Shop On Containers mobile app when validation errors are present.
Figure 6-2: Displaying validation errors during login The class represents a platform-independent effect that wraps an inner effect that's platform-specific.
HTML5's constraint validation APIs brings client-side validation to the browser without any dependencies.
You can build on top of the server-side solution later as a feature.
In this article we looked at four means of implementing client-side validation in mobile applications: the j Query validation plugin, Kendo UI's Validator, HTML5, and server-side validation alone. As my colleague Jim Cowart likes to say, the wise answer to any development question is always - .
The e Shop On Containers mobile app performs synchronous client-side validation of view model properties and notifies the user of any validation errors by highlighting the control that contains the invalid data, and by displaying error messages that inform the user why the data is invalid.
Add in a little CSS to make the form mobile-friendly, and we have the display shown below.
Any app that accepts input from users should ensure that the input is valid.