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JQUERY CREDIT CARD VALIDATOR NOT WORKING HOW TO
JQUERY CREDIT CARD VALIDATOR NOT WORKING INSTALL
JQUERY CREDIT CARD VALIDATOR NOT WORKING UPDATE

For example, suppose your user submits the form without entering a mandatory field. In client side validation the data is validated in the browser using JavaScript before submitting the data to the server. There are two types of validation: client side validation and server side validation.

JQUERY CREDIT CARD VALIDATOR NOT WORKING HOW TO

This article will explain some basics about form validation and then illustrate how to validate form fields using jQuery. In this way, client side form validation can vastly improve the user experience. By validating form responses before accepting them, we can alert users to their errors before they submit the form. People make mistakes when they fill out forms. Note: Here we use local or custom database to implement the logic, the same steps can be followed to implement the logic in a regular database like MongoDB or MySql.Įxample: This example illustrates how to validate an input field to only allow a valid credit card number.Show warnings when fields aren't entered correctly If error list is empty, give access to the user for the subsequent request.If error occurs redirect to the same page passing the error information.

Destructure ‘validationResult’ function from express-validator to use it to find any errors.

Use the validation name(validateInputField) in the routes as a middleware as an array of validations.

Validate input by validateInputField: check(input field name) and chain on validation isCreditCard() with ‘.

Create a validator.js file to code all the validation logic.

Steps to use express-validator to implement the logic:

JQUERY CREDIT CARD VALIDATOR NOT WORKING INSTALL

Mod 10: 85 modulo 10 = 5 (last digit of card)Ĭommand to install express-validator: npm install express-validator The check digit (the last number of the card) is the amount that you would need to add to get a multiple of 10 (Modulo 10).Multiply the digits in odd positions (1, 3, 5, etc.) by 2 and subtract 9 to all any result higher than 9.The last digit is what we want to check against.

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JQUERY CREDIT CARD VALIDATOR NOT WORKING UPDATE

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