检查日期是否在过去 Javascript
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Check if date is in the past Javascript
提问by user1048676
All, I'm using the jQuery UI for the date picker. I'm trying to check with javascript though that the date the user has entered is in the past. Here is my form code:
所有，我使用 jQuery UI 作为日期选择器。我正在尝试使用 javascript 进行检查，尽管用户输入的日期是过去的日期。这是我的表单代码：
<input type="text" id="datepicker" name="event_date" class="datepicker">
Then how would I check this with Javascript to make sure it isn't a date in the past? Thanks
那么我将如何使用 Javascript 进行检查以确保它不是过去的日期？谢谢
回答by Amadan
$('#datepicker').datepicker().change(evt => {
var selectedDate = $('#datepicker').datepicker('getDate');
var now = new Date();
now.setHours(0,0,0,0);
if (selectedDate < now) {
console.log("Selected date is in the past");
} else {
console.log("Selected date is NOT in the past");
}
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
<input type="text" id="datepicker" name="event_date" class="datepicker">回答by Srinivasan S
var datep = $('#datepicker').val();
if(Date.parse(datep)-Date.parse(new Date())<0)
{
// do something
}
回答by Mike
To make the answer more re-usable for things other than just the datepicker change function you can create a prototype to handle this for you.
为了使答案更可重用于日期选择器更改功能以外的其他内容，您可以创建一个原型来为您处理此问题。
// safety check to see if the prototype name is already defined
Function.prototype.method = function (name, func) {
if (!this.prototype[name]) {
this.prototype[name] = func;
return this;
}
};
Date.method('inPast', function () {
return this < new Date($.now());// the $.now() requires jQuery
});
// including this prototype as using in example
Date.method('addDays', function (days) {
var date = new Date(this);
date.setDate(date.getDate() + (days));
return date;
});
If you dont like the safety check you can use the conventional way to define prototypes:
如果你不喜欢安全检查，你可以使用传统的方式来定义原型：
Date.prototype.inPast = function(){
return this < new Date($.now());// the $.now() requires jQuery
}
Example Usage
示例用法
var dt = new Date($.now());
var yesterday = dt.addDays(-1);
var tomorrow = dt.addDays(1);
console.log('Yesterday: ' + yesterday.inPast());
console.log('Tomorrow: ' + tomorrow.inPast());
回答by Vignesh
function isPrevDate() {
alert("startDate is " + Startdate);
if(Startdate.length != 0 && Startdate !='') {
var start_date = Startdate.split('-');
alert("Input date: "+ start_date);
start_date=start_date[1]+"/"+start_date[2]+"/"+start_date[0];
alert("start date arrray format " + start_date);
var a = new Date(start_date);
//alert("The date is a" +a);
var today = new Date();
var day = today.getDate();
var mon = today.getMonth()+1;
var year = today.getFullYear();
today = (mon+"/"+day+"/"+year);
//alert(today);
var today = new Date(today);
alert("Today: "+today.getTime());
alert("a : "+a.getTime());
if(today.getTime() > a.getTime() )
{
alert("Please select Start date in range");
return false;
} else {
return true;
}
}
}
