- Enforces CSV file extension during import file selection

- Updates "no records found" error message

assets/js/src/subscribers/importExport/import.js

@@ -138,6 +138,14 @@ define(
            */
           uploadElement.change(function () {
             MailPoet.Notice.hide();
+              var ext = this.value.match(/\.(.+)$/)[1];
+              if (ext.toLowerCase() !== 'csv') {
+                this.value = '';
+                MailPoet.Notice.error(MailPoetI18n.wrongFileFormat, {
+                  timeout: 3000,
+                });
+              }
+
             toggleNextStepButton(
                 uploadProcessButtonElement,
                 (this.value.trim() !== '') ? 'on' : 'off'
@@ -416,7 +424,10 @@ define(
                 }
                 else {
                   MailPoet.Modal.loading(false);
-                  MailPoet.Notice.error(MailPoetI18n.noValidRecords, {
+                  var errorNotice = MailPoetI18n.noValidRecords;
+                  errorNotice = errorNotice.replace('[link]', '<a target="_blank" href="http://support.mailpoet.com/knowledgebase/importing-subscribers-with-a-csv-file?utm_source=wpadmin&utm_campaign=import">');
+                  errorNotice = errorNotice.replace('[/link]', '</a>');
+                  MailPoet.Notice.error(errorNotice, {
                     timeout: 3000,
                   });
                 }

views/subscribers/importExport/import.html

@@ -19,9 +19,10 @@
 'noMailChimpLists': __('No active lists found.'),
 'serverError': __('Server error:'),
 'select': __('Select'),
+'wrongFileFormat': __('Only comma-separated (CSV) file format is supported.'),
 'maxPostSizeNotice': __('Your CSV is over %s, and too big to process. Please split the file in two, or more.')|replace({'%s': maxPostSize}),
 'dataProcessingError': __("Your data couldn't be processed. Please make sure it is in the proper format."),
-'noValidRecords': __('No valid records were found.'),
+'noValidRecords': __('No valid records were found. This needs to be in CSV style. See [link]examples in our support site[/link]'),
 'importNoticeSkipped': __('%1$s records were skipped due to problems.'),
 'importNoticeInvalid': __('%1$s emails are not valid : %2$s.'),
 'importNoticeDuplicate': __('%1$s emails appear more than once in your file : %2$s.'),

views/subscribers/importExport/import/step1.html

@@ -33,7 +33,7 @@
                 <%=
                 __('This needs to be in CSV style. See [link]examples in our support site[/link].')
                 |replace({
-                '[link]': '<a target="_blank" href="http://support.mailpoet.com/knowledgebase/importing-subscribers-with-a-csv-file/main.html?utm_source=wpadmin&utm_campaign=import">',
+                '[link]': '<a target="_blank" href="http://support.mailpoet.com/knowledgebase/importing-subscribers-with-a-csv-file?utm_source=wpadmin&utm_campaign=import">',
                 '[/link]': '</a>'
                 })
                 |raw
@@ -65,7 +65,7 @@
                 <%=
                 __('This needs to be in CSV style. See [link]examples in our support site[/link].')
                 |replace({
-                '[link]': '<a target="_blank" href="http://support.mailpoet.com/knowledgebase/importing-subscribers-with-a-csv-file/main.html?utm_source=wpadmin&utm_campaign=import">',
+                '[link]': '<a target="_blank" href="http://support.mailpoet.com/knowledgebase/importing-subscribers-with-a-csv-file?utm_source=wpadmin&utm_campaign=import">',
                 '[/link]': '</a>'
                 })
                 |raw
@@ -74,7 +74,7 @@
             </label>
           </th>
           <td>
-            <input type="file" id="file_local">
+            <input type="file" id="file_local" accept=".csv" />
             &nbsp;
             <%= __( 'total max upload file size : %s' )|replace({'%s': maxPostSize}) %>
           </td>