Understanding Validation Controls in Web Development
Learn how validation controls are used to ensure data accuracy in web applications, covering common properties, techniques, and advanced controls. Explore examples like RequiredFieldValidator, CompareValidator, and RangeValidator to enhance user input validation.
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Presentation Transcript
7. Validation Controls [231-247] Name : Ankita Parulekar Presentation ID: 13 CSCI 5633
outline Introduction How to use validation control Common validation properties Validation techniques Advanced validation controls
Validation control A Validation control is used to validate the data of an input control. For example, error message will be displayed directly to the right of the text box, if it is not valid. We can use the validation controls with any of web server or HTML server input control. Validator is associated with single input control, but we can use two or more validators with same input control.
Required field validator <asp:RequiredFieldValidator runat="server" id="reqName" controltovalidate="txtName" errormessage="Please enter your name!" />
Compare Validator <asp:CompareValidator runat="server" id="cmpPassword" controltovalidate= txtPassword" controltocompare= txtRePassword" type= Password" errormessage= Confirm password does not match the password" />
Range Validator <asp:RangeValidator runat="server" id="rngDate" controltovalidate="txtDate" type="Date" minimumvalue="01-01-2006" maximumvalue="31-12-2006" errormessage="Please enter a valid date within 2006!" />
Validation Techniques Validation summary control: Summarize all the errors on a page. Validation groups: Specifies which group should be validated when a page is posted.
Validation Summary Control <asp:ValidationSummary DisplayMode="ValidationSummaryDisplayMode" />
Validation Groups <asp:TextBox ID="TextBox1" Runat="server ValidationGroup="First"></asp:TextBox>
Advanced Validation Control We can create our own validation routines. We can use Regular Expression validator to make sure that the input data matches to a particular pattern.
Advanced validation control <asp:RegularExpressionValidator ID="regexpName" runat="server" ErrorMessage="This expression does not validate." ControlToValidate="txtName" ValidationExpression="^[a-zA-Z'.\s]{1,40}$" />
