如果输入的日期在过去，则进行Javascript日期验证

Javascript date validation if date entered is in the past

本文关键字：日期 Javascript 验证 过去 输入 如果      更新时间：2023-09-26

嗨，我已经制作了一个验证表单的脚本，现在我只需要检查日期是否在过去。我使用了一组substr，但它似乎不起作用，请有人帮忙。下面是我的代码日期部分在底部。

function validateForm() {
// this part of the script will collate all errors into one should the user leave an input blank
var Fname=document.forms["myForm"]["fname"].value;
var Lname=document.forms["myForm"]["lname"].value;
var address=document.forms["myForm"]["addr1"].value;
var postcode=document.forms["myForm"]["pcode"].value;
var email=document.forms["myForm"]["email"].value;
var number=document.forms["myForm"]["tel"].value;
var date=document.forms["myForm"]["mydate"].value;
if (Fname==null || Fname=="" ||Lname==null || Lname=="" ||address==null || address=="" ||!postcode||!email||!number||( myForm.sex[0].checked == false ) && ( myForm.sex[1].checked == false )||(myForm.age[0].checked == false )&&(myForm.age[1].checked == false )&&(myForm.age[2].checked == false )&&(myForm.age[3].checked == false )&&(myForm.age[4].checked == false )||!date)
  {
  alert("Please make sure all fields are filled or checked correctly out ");
  return false;
  } 
  //end of collating script
  //start of postcode script
 var regPostcode = /^[a-zA-Z]{1,2}'d['dA-Za-z]? 'd[a-zA-Z]{2}$/;
if (!postcode.match(regPostcode))
{
    alert("That Post Code is incorrect, correct way mk4 4tr");
    return false;
}
//end of postcode script
//start of email script
var regEmail =/^'S+@'S+'.'S+$/;
if (!email.match(regEmail))
{
    alert("That email is incorrect");
    return false;
}

// end of email script
// start of phone number script
 var phonestring = /^(?:0|'+44)[12378]'d{8,9}$/;
if (!number.match(phonestring))
{
    alert(" incorrect,correct format 01908234874");
    return false;
}
// end of phone script
//start of gender script
if ( ( myForm.sex[0].checked == false ) && ( myForm.sex[1].checked == false ) ) 
{
alert ( "Please choose your Gender: Male or Female" ); 
return false;
}
// end of gender script
//start of age group script
if((myForm.age[0].checked == false )&&(myForm.age[1].checked == false )&&(myForm.age[2].checked == false )&&(myForm.age[3].checked == false )&&(myForm.age[4].checked == false )){
alert("please select an age group");
return false;
}
// end of age script
//start of datefield
var dateformat=/^(?:(?:31'/(?:0[13578]|1[02])|(?:29|30)'/(?:0[13-9]|1[012])|(?:0[1-9]|1'd|2[0-8])'/(?:0[1-9]|1[0-2]))'/[2-9]'d{3}|29'/02'/(?:[2-9]'d(?:0[48]|[2468][048]|[13579][26])|(?:[2468][048]|[3579][26])00))$/;
if (!date.match(dateformat))
{
    alert("format incorrect use dd/mm/yyyy make sure you are entering correct days to the month remember 30 days have september, april, june & november, only 28 days in february unless leap year next is 2016");
    return false;
}
var today = new Date();
var courseYear =string.substr(6,4) // use substr or substring to capture the last four digits
var courseMonth =string.substr(3,2) // use substr or substring to capture the four and fifth digits
var courseDay = string.substr(0,2)// use substr or substring to capture the first and second digits
var dateToCompare = new Date(courseYear, courseMonth, courseDay);
if (dateToCompare < today) {
alert("this date is in the past"); 
return false; }
//end of date field
else
{ alert(" Thank you a member of our team will get back to you shortly");
return true;}
}

这看起来不对：

var courseYear = string.substr(6,4) // use substr or substring to capture the last four digits
var courseMonth = string.substr(3,2) // use substr or substring to capture the four and fifth digits
var courseDay = string.substr(0,2)//

应该是：

var courseYear =date.substr(6,4);
var courseMonth =date.substr(3,2);
var courseDay = date.substr(0,2);

否则没问题：http://jsfiddle.net/balintbako/mKmaE/

您可能仍然需要考虑使用jquery插件进行表单验证。

不确定正则表达式是验证日期的最简单方法。考虑一下这里的答案：测试日期是否有效。

一旦您将字符串转换为日期对象（2行代码），您就可以使用测试它是否在过去

if ( d < new Date()) {
  // date is in the past
}

我认为坚持使用日期和月份的填充值没有任何价值，d/m/yyyy就足够了吗？

       $split_array = ($('#MyText_input_1').val());//alert($split_array);
       //ex. 31-Oct-2013
       /*** past date validation script ***/
        var c = $split_array[0]; // this is the format of the date coming in.
        var temp = new Array();
        temp = c.split('-');
        var x = new Date ( temp[1]+" "+temp[0]+", "+temp[2] );
        //alert((new Date().getTime()));
        if (x.getTime() < (new Date().getTime())) {
            alert('past date');
            return false;
        }
       /*** end script ***/
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