Fixes #6642: Fixed the bug that using confirmation dialog via `data-confirm` in an `ActiveForm` may cause the dialog to appear twice

framework/CHANGELOG.md

@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.4 under development
 -----------------------
 
+- Bug #6642: Fixed the bug that using confirmation dialog via `data-confirm` in an `ActiveForm` may cause the dialog to appear twice (pana1990, qiangxue)
 - Bug #6871: Fixed the bug that using defaults and hostnames in URL rules may cause an out-of-range index issue (qiangxue)
 - Bug #7529: Fixed `yii\web\Response::sendContentAsFile()` that was broken in 2.0.3 (samdark)
 - Bug #7603: Fixed escape characters in `FormatConverter` to work with unicode characters (maddoger, cebe)

framework/assets/yii.activeForm.js

@@ -509,12 +509,20 @@
                 data.validated = true;
                 var $button = data.submitObject || $form.find(':submit:first');
                 // TODO: if the submission is caused by "change" event, it will not work
-                if ($button.length) {
-                    $button.click();
-                } else {
-                    // no submit button in the form
-                    $form.submit();
+                if ($button.length && $button.prop('type') == 'submit' && $button.prop('name')) {
+                    // simulate button input value
+                    var $hiddenButton = $('input[type="hidden"][name="' + $button.prop('name') + '"]', $form);
+                    if (!$hiddenButton.length) {
+                        $('<input>').attr({
+                            type: 'hidden',
+                            name: $button.prop('name'),
+                            value: $button.prop('value')
+                        }).appendTo($form);
+                    } else {
+                        $hiddenButton.prop('value', $button.prop('value'));
+                    }
                 }
+                $form.submit();
             }
         } else {
             $.each(data.attributes, function () {