Question

我有以下Javascript代码。这可以防止日期为空，但我也需要它来阻止客户在今天之前的任何一天选择;我该怎么做？

HTML

<form name="myForm" method="post" action="http://www.randyconnolly.com/tests/process.php" onsubmit="return submitFunction()">

<table border="1" >
<tr>
<td>Date:</td>
<td><input type="date" name="date" id="date"></td>
</tr>
<tr>
<td><input type="Submit" value="Submit"></td><td>Click Submit to validate this form!</td>
</tr>
</table>

的Javascript

function submitFunction(myForm)
{
var errormessage =""; // Generates Error Message if true 

/*Manages a control that allows the errormessage variable to determine*
whether or not it has been deemed true. If true, an error message will appaear
If false, the code will continue to move along and validate the data. */

if (document.getElementById('date').value=="")
{
errormessage+="Select a valid date \n"; 
document.getElementById('date').style.borderColor="red";
}
else {
    document.getElementById('date').style.borderColor="green";
}

if(errormessage!="")
{
alert(errormessage);        
return false;
}


}

Answer 1

我创建了一个JSFiddle来实现您的验证要求

HTML

<input type="date">
<button>Check</button>

的JavaScript

var dateElem = document.querySelector('input'),
    todayDate = new Date();

todayDate.setHours(0);
todayDate.setMinutes(0);

document.querySelector('button').onclick = function () {
    if(dateElem.value === '') {
    alert('Please choose a date!');
  } else {
    if(todayDate.getTime() > (new Date(dateElem.value)).getTime()) {
        alert('You can not choose a date prior to today!');
    } else {
        alert('Valid date :)');
    }
  }
}

使用javascript日期进行客户端验证

1 个答案: