Question

Code:

if (!IDTextField.value && !FirstNameField.value && 
     !LastNameField.value && !DateOfBirthField.value!GenderField.value) {
    alert('No criteria Added');
    return;
}

The alert is not called when all the text fields are blank.

Answer 1

You’re missing the && between the last two criteria

It should be:

if (!IDTextField.value && !FirstNameField.value && 
     !LastNameField.value && !DateOfBirthField.value && !GenderField.value)

In cases like this, it makes a lot of sense to format your if statement like this:

if (     !IDTextField.value   
      && !FirstNameField.value   
      && !LastNameField.value   
      && !DateOfBirthField.value    
      && !GenderField.value)

If you do it this way, you can’t make the mistake you just made.