Add support for multiline text fields

Author: jscheffl

airflow/example_dags/example_params_ui_tutorial.py

@@ -169,6 +169,7 @@
             "multiline_text": Param(
                 "A multiline text Param\nthat will keep the newline\ncharacters in its value.",
                 description="This field allows for multiline text input. The returned value will be a single with newline (\\n) characters kept intact.",
+                title="Multiline text",
                 type=["string", "null"],
                 format="multiline",
             ),

airflow/ui/src/components/FlexibleForm/FlexibleFormFieldMultilineText.tsx

@@ -0,0 +1,36 @@
+/*!
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import { Textarea } from "@chakra-ui/react";
+
+import type { ParamSchema } from "src/queries/useDagParams";
+
+import type { FlexibleFormElementProps } from ".";
+
+export const isFieldMultilineText = (fieldType: string, fieldSchema: ParamSchema) =>
+  fieldType === "string" && fieldSchema.format === "multiline";
+
+export const FlexibleFormFieldMultilineText = ({ name, param }: FlexibleFormElementProps) => (
+  <Textarea
+    defaultValue={param.value as string}
+    id={`element_${name}`}
+    name={`element_${name}`}
+    rows={6}
+    size="sm"
+  />
+);

airflow/ui/src/components/FlexibleForm/FlexibleFormFieldStringArray.tsx

@@ -31,7 +31,6 @@ export const FlexibleFormFieldStringArray = ({ name, param }: FlexibleFormElemen
     defaultValue={(param.value as Array<string>).join("\n")}
     id={`element_${name}`}
     name={`element_${name}`}
-    placeholder={JSON.stringify(param.value)}
     rows={6}
     size="sm"
   />

airflow/ui/src/components/FlexibleForm/FlexibleFormNormalRow.tsx

@@ -29,6 +29,7 @@ import { FlexibleFormFieldDate, isFieldDate } from "./FlexibleFormFieldDate";
 import { FlexibleFormFieldDateTime, isFieldDateTime } from "./FlexibleFormFieldDateTime";
 import { FlexibleFormFieldDropdown, isFieldDropdown } from "./FlexibleFormFieldDropdown";
 import { FlexibleFormFieldMultiSelect, isFieldMultiSelect } from "./FlexibleFormFieldMultiSelect";
+import { FlexibleFormFieldMultilineText, isFieldMultilineText } from "./FlexibleFormFieldMultilineText";
 import { FlexibleFormFieldNumber, isFieldNumber } from "./FlexibleFormFieldNumber";
 import { FlexibleFormFieldObject, isFieldObject } from "./FlexibleFormFieldObject";
 import { FlexibleFormFieldString } from "./FlexibleFormFieldString";
@@ -84,11 +85,9 @@ export const FlexibleFormSelectElement = ({ key, name, param }: FlexibleFormElem
     return <FlexibleFormFieldObject key={key} name={name} param={param} />;
   } else if (isFieldNumber(fieldType)) {
     return <FlexibleFormFieldNumber key={key} name={name} param={param} />;
+  } else if (isFieldMultilineText(fieldType, param.schema)) {
+    return <FlexibleFormFieldMultilineText key={key} name={name} param={param} />;
   } else {
-    // TODO other elements like number, integer, select etc.
-    // Missing:
-    // - Multiline Text
-    // see airflow/www/templates/airflow/trigger.html for logic in Airflow 2
     return <FlexibleFormFieldString key={key} name={name} param={param} />;
   }
 };