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I tried to set value for p-dropdown using javascript and i see the selected index value which I gave but when I tried to trigger the event using dispatchEvent it doesn't works. For p-calender I'm not able to set date value.

Code that i have tried:

select the dropdown option
document.querySelector("p-dropdown[formcontrolname='secque']").getElementsByTagName("select")[0].options[1].selected = true

check selected option
document.querySelector("p-dropdown[formcontrolname='secque']").getElementsByTagName("select")[0].selectedOptions

to trigger event
document.querySelector("p-dropdown[formcontrolname='secque']").getElementsByTagName("select")[0].dispatchEvent(new Event('change',{ bubbles: true }))

document.querySelector("p-dropdown[formcontrolname='secque']").getElementsByTagName("select")[0].dispatchEvent(new Event('change'))

also tried with same with event "select" , "input"

for datepicker
document.querySelector("p-calendar[formcontrolname='dob']").getElementsByTagName("input")[0].value="24-01-1995"


any solution ??
Thanks in advance