Validating a web form

Posted by / 23-Oct-2020 15:12

Validating a web form

Some resources also refer to Jscript (Microsoft) and ECMAScript (European Computer Manufacturer's Association), but these are both derivatives of Java Script.

Since only Microsoft Internet Explorer supports VBScript, you'll probably choose Java Script as your primary scripting language to use on a user's computer.

The opposite pros and cons that applied to processing data validation on the user's computer apply to processing data validation on the Web server.

For instance, since the validation occurs on the Web server, your application must post the Web page that the user is viewing back to the Web server for validation to occur.

The Run At="Server" attribute is required for all ASP. The Display attribute determines how space is reserved to display the validation control message if data validation fails. NET will allocate the space on the page when the page is rendered. Other possible values for the Display attribute are Dynamic and None. NET validation controls uses a script library called Web and implements Microsoft JScript functionality that is only supported by Microsoft Internet Explorer 4.0 and later versions.

A Display attribute value of Dynamic specifies that you don't want ASP.

I used the Control To Validate attribute to link Required Field Validator to the textbox.

He is a published author on several subjects including XML, the migration from Visual Basic 6 to VB. In this scenario, if an error occurs while performing validation on the user's computer, the application can directly display the error message on the page that the user is viewing without the page making a round trip to the Web server and then back to the user.

NET, data validation was performed through scripts using either Java Script or VBScript.

The data validation controls are shown in Figure 1 as they appear in the Visual Studio . To use it, you link the Required Field Validator control to another control, such as a textbox, and use it to determine if the linked control has a value entered into it or it is empty.

If the linked control has a value entered into it, data validation will succeed.

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NET to allocate any space on the page ahead of time to display a validation control message. NET will dynamically allocate space on the page on the fly.

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