Enable empty path for geojson layer

packages/base/src/formbuilder/objectform/source/geojsonsource.ts

@@ -1,5 +1,7 @@
 import { IDict } from '@jupytergis/schema';
 import * as geojson from '@jupytergis/schema/src/schema/geojson.json';
+import { showErrorMessage } from '@jupyterlab/apputils';
+import { ISubmitEvent } from '@rjsf/core';
 import { Ajv, ValidateFunction } from 'ajv';
 
 import { loadFile } from '@/src/tools';
@@ -27,8 +29,11 @@ export class GeoJSONSourcePropertiesForm extends PathBasedSourcePropertiesForm {
     if (data?.path !== '') {
       this.removeFormEntry('data', data, schema, uiSchema);
     }
-
-    super.processSchema(data, schema, uiSchema);
+    if (this.props.formContext === 'create') {
+      ((schema.properties.path.description =
+        'The local path to a GeoJSON file. (If no path/url is provided, an empty GeoJSON is created.)'),
+        super.processSchema(data, schema, uiSchema));
+    }
   }
 
   /**
@@ -40,7 +45,7 @@ export class GeoJSONSourcePropertiesForm extends PathBasedSourcePropertiesForm {
     const extraErrors: IDict = this.state.extraErrors;
 
     let error = '';
-    let valid = false;
+    let valid = true;
     if (path) {
       try {
         const geoJSONData = await loadFile({
@@ -55,8 +60,6 @@ export class GeoJSONSourcePropertiesForm extends PathBasedSourcePropertiesForm {
       } catch (e) {
         error = `"${path}" is not a valid GeoJSON file: ${e}`;
       }
-    } else {
-      error = 'Path is required';
     }
 
     if (!valid) {
@@ -79,4 +82,17 @@ export class GeoJSONSourcePropertiesForm extends PathBasedSourcePropertiesForm {
       this.props.formErrorSignal.emit(!valid);
     }
   }
+  protected onFormSubmit(e: ISubmitEvent<any>) {
+    if (this.state.extraErrors?.path?.__errors?.length >= 1) {
+      showErrorMessage('Invalid file', this.state.extraErrors.path.__errors[0]);
+      return;
+    }
+    if (!e.formData.path) {
+      e.formData.data = {
+        type: 'FeatureCollection',
+        features: [],
+      };
+      super.onFormSubmit(e);
+    }
+  }
 }

packages/base/src/tools.ts

@@ -498,6 +498,9 @@ export const loadFile = async (fileInfo: {
   model: IJupyterGISModel;
 }) => {
   const { filepath, type, model } = fileInfo;
+  if (!filepath) {
+    return;
+  }
 
   if (filepath.startsWith('http://') || filepath.startsWith('https://')) {
     switch (type) {