[英]JavaScript credit card validation
我目前正在为学校做一些家庭作业,而我对开关的兴趣却很少!
我正在响应直到checkcard();
alert(card)
checkcard();
我的问题是,所有这些案例都不会真正验证所引用的卡的类型,不允许使用jQuery等附加组件。我将发布相关代码,并很高兴听到你们的消息: D为了方便起见,我用####注释了这些行。 此外, getcard
确实会返回所需的正确卡类型。
function getCard(){
var cardType = "unknown";
var cardTypeArray = document.getElementById("chooseCard").getElementsByTagName("input");
for(var i = 0; i < cardTypeArray.length; i++){
if (cardTypeArray[i].checked) {
cardType = cardTypeArray[i].value;
}
}
alert ("cardtype is" + cardType);
return cardType;
}
function checkCard(cardNumber){
var errMsg = "";
var card = getCard();
//var cardNumber = document.getElementById("cardNumber").value;
var regVisa = /^4[0-9]{12}(?:[0-9]{3})?$/;
var regMaster = /^5[1-5][0-9]{14}$/;
var regAmerica = /^3[47][0-9]{13}$/;
alert(card); // works till here #######
switch(card){
case "Visa":
if (parseInt(cardNumber.substring(0,1)!=4) {
errMsg = "card number is not visa \n";
}
break;
case "Mastercard":
if (cardNumber.substring(0,1) !=5) {
errMsg = "card number is not mastercard. \n";
}
break;
case "AmericanExpress":
if (cardNumber.substring(0,2) !=51) {
errMsg = "card number not american express, \n";
}
break;
}
return errMsg;
}
function validator(){
var errMsg = ""; /* stores the error message */
var result = true;
var visaCard = document.getElementById("visa").checked;
var masterCard = document.getElementById("mastercard").checked;
var americanExpress = document.getElementById("americanExpress").checked;
var cardName = document.getElementById("cardName").value;
//document.getElementById("cardName").setAttribute('maxlength',40);
var regexAlpha = /^[a-zA-Z ]+$/;
var cardNumber = document.getElementById("cardNumber").value;
var regexNum = /^[0-9]+$/;
var date = new Date();
var todayDateMonth = date.getMonth() + 1;
var todayDateYear = date.getFullYear();
var expMonth = document.getElementById("expMonth").value;
var expYear = document.getElementById("expYear").value;
var regVisa = /^4[0-9]{12}(?:[0-9]{3})?$/;
var regMaster = /^5[1-5][0-9]{14}$/;
var regAmerica = /^3[47][0-9]{13}$/;
if (todayDateMonth > expMonth || todayDateYear > expYear){
errMsg += "expiry date is wrong\n";
result = false;
}
if (!(visaCard || masterCard || americanExpress)){
errMsg += "please select visa, mastercard or american express\n";
result = false;
} /* assumes no errors */
if (cardNumber.length > 16 || cardNumber.length < 15 )
{
errMsg = errMsg + "your card number can only contain 15 to 16 digits \n";
result = false;
}else{
checkCard(cardNumber); // Starts here #######
}
if (cardName.length > 40 || cardName.length < 1 || !regexAlpha.test(cardName))
{
errMsg = errMsg + "your card name must only contain alpha characters \n";
result = false;
}
if (errMsg != "") {
alert(errMsg);
}
return result; //if false the information will not be sent to the server
}
function init() {
if(document.getElementById("regform")!==null){
var regForm = document.getElementById("regform");// get ref to the HTML element
regForm.onsubmit = validate;
prefill_form();
}
if(document.getElementById("bookform") !=null){
var bookForm = document.getElementById("bookform");
bookForm.onsubmit = validator; /* assigns functions to corresponding events */
var cancel = document.getElementById("cancelButton");
cancel.onclick = cancelBooking;
getBooking();
}
}
问题出在我的代码结构上。 您在交换机内部有一个if条件,而没有其他任何关联。 在没有太多测试条件知识的情况下,我有充分的理由相信您没有正确处理案例和条件。 查找代码错误之处的简单方法是放置debugger;
您的代码中的语句。 打开您的开发人员工具,您可以通过在大多数浏览器中按F12
或仅从右键单击选项来执行此操作。 它应该在那里暂停代码的执行。 然后,您将看到两个按钮。 1.播放按钮,可立即恢复执行代码。 2.一种弯曲的箭头,这很重要,您可以与此箭头逐行执行代码,并查看通过了哪些条件以及实际执行了代码的哪一部分。 想要对此发表评论,但太长了以至于无法容纳。 如果您在调试时遇到问题,请随时在此处评论。如果您无法打开特定窗口,则可以使用Google 开发人员工具 。
好的,所以问题是我没有返回错误消息或错误的结果。 会重新发布与以前相同的代码,但是我添加了一些代码使其对那些感兴趣的人有用。 感谢您的反馈! 我将在船上谈几点。 无论如何,代码都在下面,请查找####################。
function validator(){
var errMsg = "";
var result = true;
var visaCard = document.getElementById("visa").checked;
var masterCard = document.getElementById("mastercard").checked;
var americanExpress = document.getElementById("americanExpress").checked;
var cardName = document.getElementById("cardName").value;
var regexAlpha = /^[a-zA-Z ]+$/;
var cardNumber = document.getElementById("cardNumber").value;
var regexNum = /^[0-9]+$/;
var date = new Date();
var todayDateMonth = date.getMonth() + 1;
var todayDateYear = date.getFullYear();
var expDate = document.getElementById("expDate").value;
var dateFormat = /^[\d]{2}\/[\d]{4}$/;
if (!dateFormat.test(expDate)){
errMsg += "please select a valid date range\n";
result = false;
}else if (todayDateYear > expDate.substring(3,7)){
errMsg += "please select a valid expiry year\n";
result = false;
} else if (todayDateYear == expDate.substring(3,7) && todayDateMonth > expDate.substring(0,2)){
errMsg += "please select a valid expiry month\n";
result = false;
}
if (!(visaCard || masterCard || americanExpress)){
errMsg += "please select visa, mastercard or american express\n";
result = false;
}
if (cardNumber.length > 16 || cardNumber.length < 15 )
{
errMsg = errMsg + "your card number can only contain 15 to 16 digits \n";
result = false;
}else{
// code below is what i added ######################################
var tempMsg = checkCard(cardNumber);
if (tempMsg != "") {
errMsg = errMsg + tempMsg;
result = false;
};
}
if (cardName.length > 40 || cardName.length < 1 || !regexAlpha.test(cardName))
{
errMsg = errMsg + "your card name must only contain alpha characters \n";
result = false;
}
if (errMsg != "") {
alert(errMsg);
}
return result; //if false the information will not be sent to the server
}
function checkCard(cardNumber){
var errMsg = "";
var card = getCard();
var cvv = document.getElementById("CVV").value;
var regVisa = /^4[0-9]{12}(?:[0-9]{3})?$/;
var regMaster = /^5[1-5][0-9]{14}$/;
var regAmerica = /^3[47][0-9]{13}$/;
var cvvCheck3 =/^[0-9]{3}$/;
var cvvCheck4 =/^[0-9]{4}$/;
//do with if else
switch(card){
case "Visa":
if (!regVisa.test(cardNumber) || !cvvCheck3.test(cvv)) {
errMsg = "card number is not visa or cvv is wrrong \n";
}
break;
case "Mastercard":
if (!regMaster.test(cardNumber) || !cvvCheck3.test(cvv)) {
errMsg = "card number is not mastercard or cvv is wrong\n";
}
break;
case "AmericanExpress":
if (!regAmerica.test(cardNumber) || !cvvCheck4.test(cvv)) {
errMsg = "card number not american express or cvv is wrong, \n";
}
break;
default:
errMsg = "we cant process this card number \n";
}
return errMsg;
}
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