Merge pull request #11715 from uaoleg/patch-4

Fix scope for multiple forms file inputs

framework/assets/yii.activeForm.js

@@ -303,6 +303,7 @@
 
             // client-side validation
             $.each(data.attributes, function () {
+                this.$form = $form;
                 if (!$(this.input).is(":disabled")) {
                     this.cancelled = false;
                     // perform validation only if the form is being submitted or if an attribute is pending validation

framework/assets/yii.validation.js

@@ -383,7 +383,7 @@ yii.validation = (function ($) {
             return [];
         }
 
-        var files = $(attribute.input).get(0).files;
+        var files = $(attribute.input, attribute.$form).get(0).files;
         if (!files) {
             messages.push(options.message);
             return [];