modern-web-design-and-development

(^5) Surname
(^6)
(^7)

(^8) Phone number
(^9)
(^10)

(^11) Desired username
(^12)
(^13)

(^14)
15
When submitted, our script should check that no required fields were left
blank. If they were, the user should be notified and the submission halted.
1 $('#myform').submit(function() {
(^2) if ($(this).find('input').is('.required[value=]')) {
(^3) alert('Required fields were left blank! Please correct.');
(^4) return false; //cancel submit event
(^5) }
6 });
Here we’re not interested in returning elements to manipulate them, but
rather just in querying their existence. Our is() part of the chain merely
checks for the existence of fields within #myform that match its selector. It
returns true if it finds any, which means required fields were left blank.

7. .filter() vs. .each()

These two are concerned with iteratively visiting each element returned by
a selector and doing something to it.