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How to add Jquery Validation to Custom form and set error to field?

I want to implement client side validation using jQuery on my custom form.

I have enabled clientside validation contributed module

I have successfully attached custom js file using following code:

 $form['#attached']['library'][] = 'custom_form/cl-validation';

And in the JS file I have written below code:

(function ($, Drupal) {   Drupal.behaviors.custom_form = {     attach: function (context, settings) {          var selectedCountry = ''          $("#country").change(function(){           selectedCountry = $(this).children("option:selected").val();          });           $('#user-number-value').keyup(function(){                  $(this).val($(this).val().replace(/(d{2})|([a-z]{2})-?/,'$1-'))         });           $("input#user-number-value").focus(function() {              if(selectedCountry == undefined || selectedCountry == '') {                 $('#user-number-value').va('')                // I want mark country dropdown as red and show a error             }         });       }   }; })(jQuery, Drupal);

I am not getting how to do this using jquery and stop form submission.

Any help?

This article was republished from its original source.
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How to add Jquery Validation to Custom form and set error to field?

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