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As for validating the text, it can range from simply ensuring there is value (i.e., not an empty string) or more complex task such as validating the format of an email address. Once you have written a validation function for a specific format, convert it into a snippet, so the next time you need to validate similar data, you will save time by simply inserting your snippet.The bad news is that you have to script your validation and it can change depending on the data type and format. Validation Example 1: Checking if a Text Box Field is Empty For the first example, we will create a simple function that will ensure the field is empty as well as making sure it doesn’t only contain blank spaces.Regular expressions are useful because it allows you to match complex data by providing formatting information.In addition, Power Shell has built in support for regular expressions in the form of the –match operator.As it turns out, validating controls depends on what type of control and the format of the data you wish to validate.Typically you will be validating text that is provided by a Text Box, but it could also come from a Combo Box where the user can type their selection.Let us assume that we have two standard textboxes on the form, and we wanted one of them to exhibit behavior similar to a Rad Text Box, and the other one as a Rad Numeric Text Box.In this case, the declaration of the two textboxes, along with the Rad Input Manager, would look like this: Each of the Setting tags contains a Behavior ID, which is used to identity settings pertaining to a given text box.
This is done by passing property in the Validating event (because users may not like it when they cannot select another field when the validation fails), then it is recommended to remove the Validated event and update the Validating event as follows: For more complex validation, such as validating an email address, you may need to rely on Regular Expressions.I.e., the caret will remain in the textbox until the user enters the correct format.Important: Never attempt to set the Focus of a control in this event because it can cause the script to hang.A typical case where Causes Validation property is set to False is when there is a cancel button.
There is no need to validate a control that loses focus when the user wishes to cancel out of the form; therefore, the button’s Causes Validation property can be set to false.A good solution is to use the Error Provider control.It displays an icon next to the control indicating an error as well as displaying an error message when the user hovers the mouse over the icon.For more details on the Error Provider control, refer to the Spotlight on the Error Provider article.