'ALERT' task can be used only in on load, on validate and on change actions. Check line number : 30

Question

if(assignedto == var1)
{
    var2 = value.get("id");
}
else if(assignedto != var1)
{
    alert("unable to fetch");
}

alert function is not working in the deluge script inside if condition is there any option for doing the alert function in the deluge

Answer 1

There are some contexts where alert doesn't work. That may or may not be the case in the code above. Try replacing the alert with an info statement to see if it will display some information.
Example code:
info "unable to fetch: assignedto: " + assignedto;

Also maybe change the else if to an else to fully capture every case where assignedto == var1 is false.