Date validation using javascript?

Question

In Javascript I am trying to write the validation for a date, where the user has to select a future date and not a past date. My code seems to work only when I use a date from last month (e.g. 26/11/2011). This is my script:

<script type="text/javascript" >
 function mydate()
 { 
 var d= new Date ();
 var day= d.getDate ();
 var mon=d.getMonth ();
 var year= d.getFullYear ();
 var dateformat= day+"/"+mon+"/"+year ;
 var get= document.getElementById("txt").value; 
 if(get >= dateformat )
 {
 alert ('yes valid');
 }
 else 
 {
 alert('Date should greater than to date ');
 }
 }
</script> 

Answer 1

You are comparing the date values as strings. This is a textual comparison not a date-wise comparison so it will pretty much never work except by coincidence. You need to parse the date value the user enters into a Date data type and do a comparison that way.

Whenever possible you should avoid writing date manipulation code yourself and try to leverage a known working solution, e.g. the jQuery UI Datepicker.

• Surya sasidhar: Mr. bobbymcr can we place both javascript and asp.net validation controls in the same page for different controls.
• bobbymcr: I am neither a Javascript nor ASP.NET expert, but I'm pretty sure you can do it. You may run into difficulties, e.g. see here: stackoverflow.com/questions/4088770/…