Introduction
This code is developed to validate date entered in a web page. I found several other code snippets that provide a solution, but they are all vague and confusing, while this JavaScript script provides an easy method of validating a date. Check out this.
Using the code
Shown below is the core code for the date validation, written in JavaScript:
function IsValidDate(Day,Mn,Yr){
var DateVal = Mn + "/" + Day + "/" + Yr;
var dt = new Date(DateVal);
if(dt.getDate()!=Day){
alert('Invalid Date');
return(false);
}
else if(dt.getMonth()!=Mn-1){
alert('Invalid Date');
return(false);
}
else if(dt.getFullYear()!=Yr){
alert('Invalid Date');
return(false);
}
return(true);
}
If you plan to add this to a custom validator in ASP.NET, then the following method will do:
The code below is written for calling the above JavaScript function:
function CallDateFun(sender, args){
var d=document.getElementById("DayDropDownListCtl").value
var m=document.getElementById("MonthDropDownListCtl").value
var y=document.getElementById("YearDropDownListCtl").value
if(IsValidDate(d,m,y))
args.IsValid=true;
else
args.IsValid=false;
}
This is the code for the custom validator:
<asp:CustomValidator ID="CustomDateValidatorCtl"
runat="server" ClientValidationFunction="CallDateFun"
Text="Invalid Date" ControlToValidate="DayDropDownListCtl">
</asp:CustomValidator>
Note: DayDropDownListCtl
, MonthDropDownListCtl
, and YearDropDownListCtl
are the dropdown lists for the date, month, and year, respectively.