Fixes #16253: Fixed empty checkboxlist validation

framework/CHANGELOG.md

@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.16 under development
 ------------------------
 
+- Bug #16253: Fixed empty checkboxlist validation (GHopperMSK)
 - Bug #15286: Fixed incorrect formatting of time with timezone information (rugabarbo)
 - Bug #17021: Fix to do not remove existing message category files in a subfolder (albertborsos)
 - Bug #16991: Removed usage of `utf8_encode()` from `Request::resolvePathInfo()` (GHopperMSK)

framework/assets/yii.activeForm.js

@@ -325,7 +325,19 @@
             // client-side validation
             $.each(data.attributes, function () {
                 this.$form = $form;
-                if (!findInput($form, this).is(":disabled")) {
+                let $input = findInput($form, this);
+
+                if ($input.is(":disabled")) {
+                    return true;
+                }
+                // pass SELECT without options
+                if ($input.length && $input[0].tagName.toLowerCase() === 'select') {
+                    if (!$input[0].options.length) {
+                        return true;
+                    } else if (($input[0].options.length === 1) && ($input[0].options[0].value === '')) {
+                        return true;
+                    }
+                }
                 this.cancelled = false;
                 // perform validation only if the form is being submitted or if an attribute is pending validation
                 if (data.submitting || this.status === 2 || this.status === 3) {
@@ -334,6 +346,7 @@
                         msg = [];
                         messages[this.id] = msg;
                     }
+
                     var event = $.Event(events.beforeValidateAttribute);
                     $form.trigger(event, [this, msg, deferreds]);
                     if (event.result !== false) {
@@ -347,7 +360,6 @@
                         this.cancelled = true;
                     }
                 }
-                }
             });
 
             // ajax validation
@@ -406,7 +418,6 @@
         submitForm: function () {
             var $form = $(this),
                 data = $form.data('yiiActiveForm');
-
             if (data.validated) {
                 // Second submit's call (from validate/updateInputs)
                 data.submitting = false;