This results in the behavior described previously, where the user receives validation feedback only after the user leaves a control. Similarly, you bind the enabled property of the Clear form button to the formIsEmpty flag so that it is only enabled if the form has input in it to be cleared. Validation errors are displayed as subtle clues and help lead the user in the right direction while staying out of her way to Let The User Work.
The user should not be allowed to submit a form that has validation errors. The TextInput control is a single-line text field that is optionally editable. This Quick Start describes a method of validating data that provides the most usable experience for your users. The value of the formIsValid flag is set to true and the user is allowed to submit the form only if all validators are valid. To conceal the input text by displaying asterisks instead of the characters entered, you set the displayAsPassword property to true. Similarly, you bind the enabled property of the Clear form button to the formIsEmpty flag so that it is only enabled if the form has input in it to be cleared. If you disable a TextInput control, it displays its contents in the color specified by the disabledColor style. In a Flex application, you can create this behavior by triggering validators in response to the click event of your form's submit button. The TextInput control has the following default sizing characteristics: Although giving immediate feedback is a good thing, your application should do so in a manner that doesn't interrupt the user's flow. Alert; [Bindable] public var formIsValid: Due to a limitation in the way that browsers currently handle Flash content, the user does have to click on the Flash application once to move focus to it on the web page that it is embedded into. Performs validation on a passed Validator instance. TextInput controls do not include a label, although you can add one by using a Label control or by nesting the TextInput control in a FormItem control in a Form container. Users should receive positive feedback when the value of a control becomes valid, and they should receive negative feedback when its value becomes invalid. The user is Innocent Until Proven Guilty and no validation errors are initially shown on the form. The user should be warned about a validation error on a control only if they have had a chance to interact with that control. An example of usable client-side validation The following example demonstrates best practices in creating validation in Flex. Innocent until proven guilty: This example also violates another, related principle, Respect User Effort. In other words, you should not perform validation on controls that are in their initial state and initially display a form full of validation errors. Even more importantly, when a user is editing the value in a field that has a validation error on it, the user doesn't know whether the changes have made the control's value valid. TextInput class as an alternative to this class. The clearFormHandler method clears the values in the form controls and also resets the validators to a valid state. The user is immediately reassured when a control's value becomes valid Give Immediate Feedback and is prevented from submitting an invalid form Prevent, Don't Scold. A usable validation method must adhere, as a minimum, to the following user interface design principles for rich Internet applications. The user should get immediate feedback as they are interacting with a control.
Video about validating text input in flex:
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