How can I do validation for datetime input component?

General Discussion
1

I want to check whether user picked date from datetime input component on a button click
I tried following codes:
if isNull(self.session.custom.expenseSelectDate):
if self.session.custom.expenseSelectDate == null:
if self.session.custom.expenseSelectDate == “null”:
if self.session.custom.expenseSelectDate == “”:
if self.session.custom.expenseSelectDate == 0:

none of them seems wokring

Thank you.

2

Try just if self.session.custom.expenseSelectDate:.
Python uses the special singleton instance None to represent no value/null.
Literal null is a syntax error unless you’ve defined a variable null in scope.
== "null" is comparing against the literal string "null".
== "" is comparing against an empty string.
== 0 is checking for exact equality with 0; not a ‘falsey’ comparison.

If you omit all operators, Python’s if statement automatically checks for ‘truth’; the following statements are essentially equivalent:

x = 1
if True:
if x:
if x == True:
if bool(x):
if bool(x) == True:

Python’s None singleton is ‘falsey’, so you can simply:

if x:

Which will fail if x is None. Or, the recommended style, which is more explicit:

if x is not None:
3

image

Still not working

4

You might want to add some logging so you can see what you really have in self.session.custom.expenseSelectDate.

5

Its changing color as required on submit since its checking for true condition i want to check for false condition, how can i do that ?

6

image

its null in log there were no errors

7

Use not:

if not self.session.custom.expenseSelectDate:
    # do something if it's not set
1 Like
8

this worked for me:

if self.session.custom.expenseSelectDate is None:

Thank you

1 Like