How check if jQuery datepicker is empty?

问题

I have a date picker empty, but I do not know how to check if is empty (not validated or not)

回答1:

You can check the value of the input using .val(), like this:

if($("#fieldID").val() == "") {
  alert("no date selected");
}

Or for inline datepickers and such as well, use getDate which returns null if there's nothing selected:

if($("#fieldID").datepicker("getDate") === null) {
  alert("no date selected");
}

回答2:

I used something like this and it worked for me.

if($("#fieldID").val() == undefined) {
  alert("no date selected");
}

来源：https://stackoverflow.com/questions/4109913/how-check-if-jquery-datepicker-is-empty