Question

下面是我的javascript首先关注我的xhtml代码我试图让它验证我的日期然而它正在接收我输入的每个日期作为无效日期，有人可以告诉我什么是缺少任何帮助将要做的感谢提前

function validateForm(form)
{
    var a, i, title, fname, lname, sex, address, email, username, password, confirm, error, check, type, contact, date;
    var reg = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    var matches = /^(\d{2})[-\/](\d{2})[-\/](\d{4})$/.exec(date);

    a=0;
    check=false;
    error=false;

    //other codes
    date=document.getElementById('date').value;
    //other code

if (matches == null) 
    alert('Please enter a valid date of birth');
    return false;
    var d = matches[2];
    var m = matches[1] - 1;
    var y = matches[3];
    var composedDate = new Date(y, m, d);
    return composedDate.getDate() == d &&
            composedDate.getMonth() == m &&
            composedDate.getFullYear() == y;

下面是我的HTML

    <form name="myForm" method="post" action="sub.html" onsubmit="return validateForm();">
    <fieldset>

    <p>Last Name:<input id="lastname" type="text" name="lname" size="40" placeholder="Last Name"/>*</p>

    <p>Sex: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Male <input id="mletter" type="radio" name="sex" value="male"/> &nbsp; &nbsp; Female <input id="fletter" type="radio" name="sex" value="female"/>*</p>

    <p>Date Of Birth: <input id="date" type="text" name="dob" placeholder="MM-DD-YYYY"/>*</p>

    <p>Address: &nbsp; &nbsp; <textarea id="address" rows="4"  cols="40" ></textarea>*</p>


    </fieldset>
    </form>

Answer 1

在获取date

的值之前，您正在检查格式

此外，if可能需要一些大括号来包含return false

var matches, date;
//other codes
date=document.getElementById('date').value;
matches = /^(\d{2})[-\/](\d{2})[-\/](\d{4})$/.exec(date);
if(matches === null){
    alert('wrong date format');
    return false;
}

检查无效的日期字符串格式，首先获取要检查的日期字符串

date=document.getElementById('date').value;

然后使用exec

进行regexp

matches = /^(\d{2})[-\/](\d{2})[-\/](\d{4})$/.exec(date);

不要按相反的顺序进行。

在javascript中验证DD-MM-YYYY形成

1 个答案: