diff --git a/lib/zin/wg/thinktableinput/js/v1.js b/lib/zin/wg/thinktableinput/js/v1.js
index 6784f79145..aa6e12af7b 100644
--- a/lib/zin/wg/thinktableinput/js/v1.js
+++ b/lib/zin/wg/thinktableinput/js/v1.js
@@ -12,3 +12,45 @@ window.changeInput = function(e)
     const intValue = value < 1 ? 1 : parseInt(value, 10);
     $(this).val(intValue);
 }
+/**
+ * Set line number.
+ *
+ * @access public
+ * @return void
+ */
+function setLineIndex()
+{
+    let index = 0;
+    $('.rows-group').each(function()
+    {
+        $(this).find('[name^="addFileds"]').attr('name', 'addFileds[' + index + ']');
+        $(this).find('[name^="result"]').attr('name', 'result[' + index + ']');
+        index ++;
+    });
+    $('.add-rows').toggleClass('disabled', index >= canAddRows);
+}
+
+window.addRow = function(e)
+{
+    if($('.rows-template').hasClass('hidden'))
+    {
+        $('.rows-template').removeClass('hidden');
+    }
+    else
+    {
+        if($('.rows-group').length >= canAddRows) return;
+        var parentFormGroup = $(e.target || e).closest('.form-group');
+        var $newRow = $('.rows-template').clone();
+        $newRow.find('.btn-add').attr('onclick', 'addRow(this)');
+        $newRow.removeClass('rows-template');
+        $newRow.find('textarea').val('');
+        parentFormGroup.after($newRow);
+    }
+    setLineIndex();
+}
+
+$(document).on('click', '.btn-delete', function() {
+    var $row = $(this).closest('.form-group');
+    $row.remove();
+    setLineIndex();
+})