The addDays method doesn't exist. You need to use thesetDate()
method.
let dateInput = document.getElementById("dateInput");
dateInput.addEventListener("change", () => {
console.log("eventWorking");
var inputValue = dateInput.value;
var inputDate = new Date(inputValue);
console.log(inputDate);
// Adding 21 days using setDate
inputDate.setDate(inputDate.getDate() + 21);
console.log(inputDate);
})
Date: <input id="dateInput" type="date" name="manufacture_one" required >
You use thesetDate
method to add the desired amount of days to an existing date object and, for simplicity in outputting to theend_date
field rather than simply usevalue
you can usevalueAsDate
as below.
IncidentallyID
attributes MUST be unique and in most cases are not really required as identification of DOM elements can be done in other ways such asquerySelector
. Also perhaps worth noting is that the use ofinline
event handlers is not considered best practise nowadays - externally registered event handlers are much cleaner '-)
document.querySelector('p.flip').addEventListener('click',function(e){
let manufacture_date=this.parentNode.querySelector('[name="manufacture_one"]');
let end_date=this.parentNode.querySelector('[name="end_date"]');
if( manufacture_date.value=='' ){
alert('Date cannot be blank');
return false;
}
let mdate=new Date( manufacture_date.value );
let ndate=new Date( mdate.setDate( mdate.getDate() + 21 ) );
end_date.valueAsDate=ndate;
});
<form action="form_page.php" method="post">
<div>*Task / Person: <input type="text" name="product" required /></div>
<div>*Description: <input type="text" name="customer" required /></div>
<div>*Date: <input type="date" name="manufacture_one" required /></div>
<p class="flip">Click to add End Date</p>
<div id="panel">End Date: (holidays only) <input type="date" name="end_date"></div>
<input type="submit" />
</form>
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