custom_ fields: added subject autocomplete dropdown

src/lib/forms/widgets/custom_fields/CustomFields.js

@@ -87,7 +87,7 @@ export class CustomFields extends Component {
               {fields}
             </AccordionField>
           ))}
-        {discoverFieldsSections && (
+        {discoverFieldsSections && discoverFieldsSections.length > 0 && (
           <DiscoverFieldsSection
             templateLoaders={templateLoaders}
             sections={discoverFieldsSections}

src/lib/forms/widgets/custom_fields/SubjectAutocompleteDropdown.js

@@ -0,0 +1,116 @@
+import React, { Component } from "react";
+import PropTypes from "prop-types";
+import { RemoteSelectField } from "../../RemoteSelectField";
+import { Field, getIn } from "formik";
+import { FieldLabel } from "../../FieldLabel";
+
+export class SubjectAutocompleteDropdown extends Component {
+  serializeSubjects = (subjects) =>
+    subjects.map((subject) => {
+      const scheme = subject.scheme ? `(${subject.scheme}) ` : "";
+      return {
+        text: scheme + subject.subject,
+        value: subject.subject,
+        key: subject.subject,
+        ...(subject.id ? { id: subject.id } : {}),
+        subject: subject.subject,
+      };
+    });
+
+  prepareSuggest = (searchQuery) => {
+    const { limitTo } = this.props;
+    return limitTo === "" || limitTo === "all"
+      ? searchQuery
+      : `${limitTo}:${searchQuery}`;
+  };
+
+  render() {
+    const {
+      fieldPath,
+      required,
+      multiple,
+      placeholder,
+      clearable,
+      label,
+      icon,
+      width,
+      allowAdditions,
+      noQueryMessage,
+    } = this.props;
+    const labelContent = label ? (
+      <FieldLabel htmlFor={fieldPath} icon={icon} label={label} />
+    ) : (
+      <>
+        {/* Placeholder label for alignment purposes */}
+        <label htmlFor={fieldPath} className="mobile-hidden">
+          &nbsp;
+        </label>
+      </>
+    );
+
+    return (
+      <Field name={fieldPath}>
+        {({ form: { values } }) => (
+          <RemoteSelectField
+            clearable={clearable}
+            fieldPath={fieldPath}
+            initialSuggestions={getIn(values, fieldPath, [])}
+            multiple={multiple}
+            noQueryMessage={noQueryMessage}
+            placeholder={placeholder}
+            preSearchChange={this.prepareSuggest}
+            required={required}
+            serializeSuggestions={this.serializeSubjects}
+            serializeAddedValue={(value) => ({
+              text: value,
+              value: value,
+              key: value,
+              subject: value,
+            })}
+            suggestionAPIUrl="/api/subjects"
+            onValueChange={({ formikProps }, selectedSuggestions) => {
+              formikProps.form.setFieldValue(
+                fieldPath,
+                selectedSuggestions.map((subject) => ({
+                  subject: subject.subject,
+                  id: subject.id,
+                }))
+              );
+            }}
+            label={labelContent}
+            value={getIn(values, fieldPath, []).map((val) => val.subject)}
+            allowAdditions={allowAdditions}
+            width={width}
+          />
+        )}
+      </Field>
+    );
+  }
+}
+
+SubjectAutocompleteDropdown.propTypes = {
+  fieldPath: PropTypes.string.isRequired,
+  limitTo: PropTypes.string,
+  label: PropTypes.string,
+  icon: PropTypes.string,
+  required: PropTypes.bool,
+  multiple: PropTypes.bool,
+  clearable: PropTypes.bool,
+  placeholder: PropTypes.string,
+  width: PropTypes.number,
+  allowAdditions: PropTypes.bool,
+  noQueryMessage: PropTypes.string,
+};
+
+SubjectAutocompleteDropdown.defaultProps = {
+  required: false,
+  limitTo: "",
+  label: "",
+  icon: undefined,
+  multiple: true,
+  clearable: true,
+  placeholder: "Search for a subject by name",
+  width: undefined,
+  noQueryMessage: "Search or create subjects...",
+  allowAdditions: true,
+};

src/lib/forms/widgets/custom_fields/index.js

@@ -1 +1,2 @@
 export { CustomFields } from "./CustomFields";
+export { SubjectAutocompleteDropdown } from "./SubjectAutocompleteDropdown";