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The first part of the credit-card number identifies the type Most credit cards contain a check digit, which is the digit at the end of the CREDIT CARD VALIDATOR JAVASCRIPT MODOr mod 10 - algorithm ) is used to generate and/or validate and verify the Than you are aware, validating credit card inputs.īased on ANSI X4.13, the LUHN formula (also known as the modulus 10. Want to move onto something that is probably much more sophisticated Knowing things about the formats of the desired inputs. Using particular built-in JavaScript string manipulation functions and However, the entire process takes place backstage the web page never refreshes, and only small parts of the user interface change as the user interacts with the application.We have already done some work with validating inputs such as social The eMsg( ) function is responsible for generating a styled user message in red, in the event of an error in handling the purchase information, or in blue otherwise. ![]() credit card number, security code, credit card type, and expiration dateįunction verify(ccard,secure_code,cctype,ccexp) ![]() This.exp_month.value+" "+this.exp_year.value) CREDIT CARD VALIDATOR JAVASCRIPT CODEHere is the code contained in cc.js: var finalCnumber http_request.js (see "Use Your Own Library for XMLHttpRequest" ) creates and calls the methods of XMLHttpRequest. Verifying the Card NumberĬc.js contains the code for responding to the user's button click, as well as for verifying the information and generating a user message. In addition, it is worth mentioning a second time that the main job of validating a credit card rests with the processing server component(s).Ī message in blue notifies the user that the organization is processing the credit card. We are not strictly making a secure connection in this hack, but a real application would not send any purchase information unencrypted over a network. If the credit card number is verified and everything else has been correctly entered, the hack uses XMLHttpRequest to send this information to a server. Figure 3-5 shows one of these messages.įigure 3-5. If one of these checks fails, the hack displays an error message in red. The Luhn forumla is a well-known algorithm used to verify ID numbers like credit card numbers. The JavaScript makes sure that the fields are not blank and contain the required minimum number of characters (such as three for the CSC), and then it verifies the card number using the Luhn formula or algorithm. However, instead of having the page dissolve and the values depart immediately for the server, the application verifies a few conditions first. The user chooses a credit card type (e.g., "Mastercard") enters the card number, expiration date, and card security code (CSC) and clicks the Submit button. ![]() It imports two JavaScript files, http_request.js and cc.js: Ĭredit card number (# or no spaces): CREDIT CARD VALIDATOR JAVASCRIPT VERIFICATIONEnter a credit card number for verification This hack, however, just verifies the number, generates a message, and makes an HTTP request using Ajax techniques.įigure 3-4 shows what the web page looks like.įigure 3-4. The server connection will likely be initiated over Secure Sockets Layer (SSL), such as with the HTTPS protocol, and be involved with an e-commerce component that further verifies the purchase information with a merchant bank. (Although we won't discuss them here, as in "Validate Email Syntax", the server component then implements its own credit card validation routines.) Nothing else changes on the page except for a user message, which notifies the user of any error conditions or that the credit card has passed muster and has been sent to the server to be processed. This hack verifies the entered credit card number, then submits it to the server component only if the number is valid. Validate credit card numbers without submitting and refreshing the entire web page.Įntering a credit card number on a web page has become commonplace. ![]()
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