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CSS? ??? ?????? ???? CSS? clear ??? ???? float ??(clearing float)? ??? ??? ?? ??? ? ??? ? ????. In this example I will validate TextBox data and make sure that the entered text is strictly numeric i.e.
Here Mudassar Ahmed Khan has explained how to change the Background and Border colors of invalid controls when validations fails so that we can notify the users that in a better way. This RequiredFieldValidator forces the user to enter text into the control associated with the validator. There are various validation controls availabe, and we will cover them in the rest of the article. All of the validation controls must have the ControlToValidate property set before rendering the page or the control throws an exception. We are using a Display setting of Dynamic so we reserve no space for the RangeValidator error message.
Use the CompareValidator to compare the value of an input control to either a constant value, or the value in another input control. Notice the name of the function matches the value of the ClientValidationFunction property. In order to write client side validation functions you’ll need to lean a little about JavaScript, which we do not cover in this book.
To provide a server side implementation of our validation code we need to provide an event handler for the ServerValidate event of the CustomValidator.
Notice the code in our server side validation is not very different from the JavaScript version. Calling the Validate method of the Page before checking the IsValid property will fix the exception shown above. You can use the ValidationSummary control to display all of your validation errors in a single location of the web form.
If you do not want the validation controls themselves to display errors on the form, set the Display property for each control to false. In the design view of the following form, we have placed the validation control on the right side of the form with the DisplayMode property set to List. While there is no new code in place to use the ValidationSummary control (the runtime will automatically place error messages inside the control for us), there is some new code. If we launch the form and click Submit without entering any values, we should see the following display. CR ?? ??? PR(Proposed Recommendation)? ???? ??? ??? ????? ? ?? ?? ??? CSS 2.1 ?? ??? ?? ??? ? ?? ??? ???? CR ??(6??)? ?? ??? ??? ??? ????? ??? ???? ???? ???? ??? ?? ?? PR ??? ??? ???, ??? 4??? PR ??? ???? ?? ??? ? ? ?? ???? ??? ?? ?? ????? ??? ????.
The associated control is set by right clicking on the validator and selecting Properties from the context menu.
As we will see later in the code-behind file, the CancelButton will clear all of the fields on the form, and we do not want to validate any of the fields when the user presses this button. We can double click on both of the Button controls on the form to add event handlers for the click events. The following screen shows the form in action, and the user has pressed the Submit button without entering any text into the textbox. Malicious users might circumvent client side validations in an effort to break-in or damage your servers. All of the validation controls derive from the BaseValidator class, giving them common methods and properties.


This property can take one of the following values: String, Integer, Double, Date, or Currency. We want to make sure a user enters a hire date, the date is in a valid format, and the data is within one week (plus or minus) of today’s date. The RangeValidator does not validate the contents of an input control if the control is empty.
With the static setting, the control reserves space to display an error message even when no error message is present. You can modify these properties in the example program to see the result of using different settings. You can set the ValueToCompare property at design time or programmatically as the value to compare against.
This is the control to use when you need to ensure the user enters a phone number or email address in the correct format. You might need this if your validation requires a database query, or a non-trivial mathematical expression. This property is specific to the CustomValidator, and allows you to present the name of a function existing in client side script. However, the source code shown above should be fairly readable if you have some C#, C++, or Java experience. Right click the control and click Properties on the context menu, then switch to the event view of the Properties dialog.
As an example, you may pre-populate a form during initialization with information, and this occurs before the user has a chance to interact with the form.
Our next step is to put everything together into a working form to submit a new employee record into the database. You’ll find many of the same validation controls we have used throughout the chapter in this form.
First, you’ll notice we now have a drop down control for the user to select the employee’s manager. This distinction becomes useful when we examine the new code to insert an employee record into the database. All of the validation errors appear in the validation summary, but unfortunately there is no indication of which fields have produced the errors.
When there is no ValidationSummary control present on a Form, the runtime will use the Text property to display an error message on the form. Notice in the following screen capture, we can see the RequiredFieldValidator error message display on the form. Whenever the user presses a button on the form, the script executes the validation checks for each validation control on the form. Simply put, never trust the data in an incoming request, and always validate on the server. As we mentioned earlier, validation controls execute when the user clicks a Button control, including HTML button controls and server button controls such as the LinkButton and ImageButton.
We have seen the RequiredFieldValidator in our first sample program, let’s move on to examine the rest of the controls.
The RangeValidator will first try to convert the values it is examining into the type specified.
If the Display property is set to None, no errors are displayed where the validation control is placed on the form.


You can use the static setting to ensure your page appearance stays exactly the same when an error message appears. Note, we would need to add a RequiredFieldValidator if we want to prevent the user from submitting the form with empty password inputs.
The second variable passed to the function (args) is the primary variable we need to make use of. We simply take the last three characters of the incoming text to see if they contain the string jpg. After double clicking on the ServerValidate event, the IDE should take you to the code-behind file with an empty event handler.
During Page_Load, you might want to check the IsValid property of the page to see if the pre-populated data will validate. If we place this call in the Page_Load method as shown below, any validation errors will appear on the first page view for the user.
The control names appear inside of brackets ([ ]) when the Display property is set to None.
During the Page_Load method we will call another method to populate the drop down with a list of employees in the database.
The code will need to extract the EmployeeId of the selected manager to generate the correct insert statement, and this technique allows us to easily pull the EmployeeId using the value field of the selected item.
IE8??? overflow? IE7 ???? ?????, ??? ?? ??? ????? ????? ??? ??? ? ????? ?? hasLayout ??? ??? ?? ??? ????? ? ????. We will see an example of using a Display of None later in the chapter when we look at the ValidationSummary control.
Since it is difficult for the user to know if they made a typing mistake, users are generally given two input controls: one to enter the password and another to confirm the password. The IsValid member we use to indicate if the validation has passed or failed, while the Value member contains the text in the control to validate. If the test is positive, we can pass validation by setting the args IsValid property to true. Without adding an additional step, however, a call to IsValid produces the following error. You probably want to try each of these settings to see which looks best with your form layout. While this behavior seems unrelated to validation, it is another good example of the data binding capability of web form controls, and offers an example of how we can help the user avoid validation errors by forcing a selection from a list of good values.
The following code shows the event handler invoked when the user clicks the Submit button on the form. Stateserver – Le informazioni di sessione sono archiviate su di un server esterno in memoria. We can set other properties, such as the ErrorMessage property, and the final ASPX source code should look like the following. Instead, when validation fails and the control displays an error, the control adds space to the page for the error to appear, which can change the layout of the screen. The Regular Expression Validator HtmlHelper is designed to help developers accomplish this.



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