* file: bug #47006, optimize UI of image uploader.

module/file/js/uploadimages.ui.js

@@ -63,7 +63,7 @@ window.uploadImages = function(selector, options, $uploadBtn)
 
     if(!files.length)
     {
-        zui.Modal.alert(options.uploadEmpty);
+        if(!$uploadBtn.hasClass('disabled')) zui.Modal.alert(options.errorUploadEmpty);
         return;
     }
 

module/file/ui/uploadimages.html.php

@@ -29,14 +29,16 @@ imageSelector
     set::_id($selectorID),
     set::className('surface'),
     set::name('uploader'),
-    set::tip(false)
+    set::tip(false),
+    set::onChange(jsCallback('event')->do('$(event.target).closest(".modal-dialog").find(".btn-upload").toggleClass("disabled", !event.target.files.length)')),
 );
 
 toolbar
 (
     btn
     (
-        setClass('primary uploadBtn'),
+        setClass('primary btn-upload'),
+        set::disabled(true),
         on::click()->call('uploadImages', "#$selectorID", $uploadOptions, jsRaw('$this')),
         $lang->file->beginUpload,
         span(setClass('as-progress'))