JS uses regular expressions to control users' input of bank card numbers and formatting. js bank cards

JS uses regular expressions to control users' input of bank card numbers and formatting. js bank cards

// Js Regular Expression for controlling and formatting the user's input bank card number

<Script language = "javascript" type = "text/javascript"> function formatBankNo (BankNo) {if (BankNo. value = "") return; var account = new String (BankNo. value); account = account. substring ();/* Total number of accounts, including Spaces */if (account. match (". [0-9] {4}-[0-9] {4}-[0-9] {4}-[0-9] {7 }") = null) {/* control format */if (account. match (". [0-9] {4}-[0-9] {4}-[0-9] {4}-[0-9] {7} | "+ ". [0-9] {4}-[0-9] {4}-[0-9] {4}-[0-9] {7} | "+ ". [0-9] {4}-[0-9] {4}-[0-9] {4}-[0-9] {7} | "+ ". [0-9] {4}-[0-9] {4}-[0-9] {4}-[0-9] {7 }") = null) {var accountNumeric = accountChar = "", I; for (I = 0; I <account. length; I ++) {accountChar = account. substr (I, 1); if (! IsNaN (accountChar) & (accountChar! = "") AccountNumeric = accountNumeric + accountChar;} account = ""; for (I = 0; I <accountNumeric. length; I ++) {/* You can change the following space to-, and the effect is good */if (I = 4) account = account + ""; /* Add spaces after the fourth digit of the account */if (I = 8) account = account + "";/* Add spaces after the eighth digit of the account */if (I = 12) account = account + "";/* Add a space after the first digit of the account */account = account + accountNumeric. substr (I, 1) }}else {account = "" + account. substring (1, 5) +" "+ Account. substring () +" "+ account. substring () +"-"+ account. substring ();} if (account! = BankNo. value) BankNo. value = account ;}</script>

<input type="text" value="" size="25" onkeyup="formatBankNo(this)" onkeydown="formatBankNo(this)" name="account" id="account">

The above section describes how to use regular expressions to control the user's input and formatting of bank card numbers. I hope this will be helpful to you. If you have any questions, please leave a message for me, the editor will reply to you in a timely manner. Thank you very much for your support for the help House website!