如何使用Javascript验证信用卡的有效期? [英] How do I validate a credit card expiry date with Javascript?
问题描述
我是一名完全的Java初学者，我真的很执教.我必须让用户输入信用卡详细信息并使用Javascript对其进行验证.这是我的问题.
I'm a complete Javascript beginner and I'm really stuck on my assignment. I have to get the user to enter credit card details and validate them with Javascript. Here are my problems.
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当您不选择任何内容(这是我想要的操作)时，付款类型将返回false，但是我对到期的月份和年份使用了类似的代码，即使这两个年份也可以返回true如果您没有选择，我希望它们返回false.
The payment type returns false when you don't select anything (which is what I want it to do), but I've used similar code for the expiry month and year, and those two can return true even if you don't make a selection, I want them to return false.
有效期验证我真的不知道该怎么办.它只能接受今天日期之后的日期.我提出了一些在理论上应该起作用的东西，但是没有.有什么简单的事情(请记住我是一个初学者！)，我可以添加或更改它以使其正常工作吗?
The expiry date validation I don't really know how to do. It has to only accept dates after today's date. I've sort of come up with something that should work in theory, but doesn't. Is there something simple (remember I'm a beginner!) that I can add or change that would make it work?
用于信用卡号验证的脚本也存在问题(需要为16个数字)，但莫名其妙地似乎不起作用.
There's an issue with the script for the credit card number validation (needs to be 16 numbers) as well, but inexplicably it just doesn't seem to work.
我的Javascript和html在下面.
My Javascript and html are below.
感谢您的帮助！
最诚挚的问候，
格雷格
JAVASCRIPT
function validateForm()
{
var firstName=document.getElementById("firstName");
var lastName=document.getElementById("lastName");
var email=document.getElementById("email");
var postcode=document.getElementById("postcode");
var paymentType=document.getElementById("paymentType");
var exMonth=document.getElementById("exMonth").value;
var exYear=document.getElementById("exYear").value;
var cardNumber=document.getElementById("cardNumber").value;
var date = new Date ();
var month = date.getMonth();
var year = date.getFullYear();
if (firstName.value===""){
alert("Please enter your first name");
firstName.focus();
return false;
}
if (lastName.value===""){
alert("Please enter your last name");
lastName.focus();
return false;
}
if (email.value.indexOf(".") == -1 || email.value.indexOf("@")== -1) {
alert("Please include a valid email address");
email.focus();
return false;
}
if (postcode.value.length!=4 || isNaN(postcode.value)){
alert("Please enter 4 numbers for your postcode");
postcode.focus();
return false;
}
if (paymentType.selectedIndex === 0){
alert("Please select payment type");
return false;
}
if (exMonth.selectedIndex === 0){
alert("Please select the month");
return false;
}
if (exYear.selectedIndex === 0){
alert("Please select the year");
return false;
}
if (year> exYear || (year === exYear && month >= exMonth)){
alert("The expiry date is before today's date. Please select a valid expiry date");
return false;
}
if (cardNumber.value.length!=16 || isNaN(cardNumber.value)){
alert("Please enter 16 numbers for your credit card");
cardNumber.focus();
return false;
}
alert("Thank you for your submission");
return true;
}
HTML
<form name="myForm" autocomplete="on" onsubmit="return validateForm()">
<p><label>First name (required) <input type="text" id="firstName"
autofocus="autofocus" /> </label></p>
<p><label>Last name (required) <input type="text" id="lastName"/> </label></p>
<p> Email address (required)
<input type="text" id="email" /> </p>
<p> Postcode (required)
<input type="text" id="postcode"/> </p>
<p> Payment type (required)
<select id="paymentType" title="Choose a payment type">
<option value="0">Select a payment option</option>
<option value="visa">VISA</option>
<option value="master">Mastercard</option>
<option value="amer">American Express</option>
</select>
</p>
<p> Expiry date (required)
<select id="exMonth" title="select a month">
<option value="0">Enter month</option>
<option value="01">January</option>
<option value="02">February</option>
<option value="03">March</option>
<option value="04">April</option>
<option value="05">May</option>
<option value="06">June</option>
<option value="07">July</option>
<option value="08">August</option>
<option value="09">September</option>
<option value="10">October</option>
<option value="11">November</option>
<option value="12">December</option>
</select>
<select id="exYear" title="select a year">
<option value="0">Enter year</option>
<option value="2013">2013</option>
<option value="2014">2014</option>
<option value="2015">2015</option>
<option value="2016">2016</option>
<option value="2017">2017</option>
<option value="2018">2018</option>
<option value="2019">2019</option>
<option value="2020">2020</option>
<option value="2021">2021</option>
<option value="2022">2022</option>
<option value="2023">2023</option>
<option value="2024">2024</option>
<option value="2025">2025</option>
<option value="2026">2026</option>
<option value="2027">2027</option>
<option value="2028">2028</option>
<option value="2029">2029</option>
<option value="2030">2030</option>
<option value="2031">2031</option>
</select>
</p>
<p><label>Credit card number (required) <input type="text" id="cardNumber"/> </label></p>
<div id="centreimg">
<input type="submit" name="S1" value="Submit response" />
<input type="reset" name="reset" value="Clear form" />
</div>
</form>
推荐答案
对于信用卡过期验证，您可以这样做.
And for the credit card expiration validation you can do like this.
var today, someday;
var exMonth=document.getElementById("exMonth");
var exYear=document.getElementById("exYear");
today = new Date();
someday = new Date();
someday.setFullYear(exYear, exMonth, 1);
if (someday < today) {
alert("The expiry date is before today's date. Please select a valid expiry date");
return false;
}
这篇关于如何使用Javascript验证信用卡的有效期?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
