VALIDATORS

(a) Compare field Validator: Is a Control with compare feature.       Comparing one control with another control. Properties: (i) Control to Validate. (ii) Control to Compare. (iii) Operator. (iv) Type. (v) Error message. EX:       To compare two Quantities or to compare any data with another data we use these validators.lets take an example of comparing two quantities.

Quantity

Text Box1

Confirm Quantity Compare Validator.                       Text Box2

Enter

<asp: Compare Validator id=Compare Validator Control to validate “text Box2” Control to Compare “Text Box1”Operator =”Equal” Error Message=”Quantity mismatch” Type=String Runat=”server”/>

Interview Point: Server side control :-< asp: Text Box id=Text box1 runat=server/>                “asp:”in the above line is Tag prefix.                “Text Box “is the Tag name. Syntax: <tag prefix: tag name<attributes>runat=server/>

(b) Control-Value

(i) Control to validate.     (ii) Value t Compare.     (iii) Type.     (iv) Operator.     (v) Error message. (c) Control-Data type      (i) Control to validate.      (ii) Operator data type check.      (iii) Type.      (iv) Error Message.

Regular Expression Validator (Post.Pre name) Mobile expression: - \d-->digits                       \d{10}-->digits of 10                       \d{1,10}-->between 1 to 10                       \d{5,10}-->ranging 5 numbers only                       \d{3} -\d{8} (ex: 040-23754526)                       \ (A-Z){8}->8 alphabetic characters are allowed                       \ (a-z A-Z){8}-Caps & Small Note: Custom validator allows users to write the logic for validating data and then takes care of displaying an error and form submission. Using custom validator we can perform validation either in client or at server (if needed both places).client side means using javascript.And server side means using C#.NET. Note: ASP.NET controls perform by default validations in the client on submission it also perform validation at server. This is to ensure more accuracy and also to avoid malfunctioning that may occur during submission of data.   Custom validator allows user to implement client side validation using java script.

Custom Validator

Client side java script

Server side java script

Client side JavaScript:       (1) Place the custom validator in the form and set the following properties.                 (i) Control to Validate                 (ii) Error Message                 (iii) Client validate function        (2) Go to ‘source’ view or ‘html’ view and add script tag to it .inside script tag write “JavaScript” function with “two parameters” these two parameters specifies the object and the arguments are passed from control to function or function to control using which we can perform our required validations. <script language=”JavaScript”> Function f1(x, y). x-is object. Y-argument. { }; Ex: function check data(x, y)    {      If (y.value>10)     Y.Is Valid=True;     else     Y.Is valid=False;