[feat] add function to return the children of a node

src/map/handlers/nodes.ts

@@ -267,6 +267,29 @@ export default class Nodes {
         }
     };
 
+    /**
+     * Return the children of the node.
+     * @param {string} id
+     * @returns {ExportNodeProperties[]}
+     */
+    public nodeChildren = (id?: string): ExportNodeProperties[] => {
+        if (id && typeof id !== "string") {
+            Log.error("The node id must be a string", "type");
+        }
+
+        let node: Node = id ? this.getNode(id) : this.selectedNode;
+
+        if (node === undefined) {
+            Log.error("There are no nodes with id \"" + id + "\"");
+        }
+
+        return this.nodes.values().filter((n: Node) => {
+            return n.parent && n.parent.id === node.id;
+        }).map((n: Node) => {
+            return this.getNodeProperties(n);
+        });
+    };
+
     /**
      * Return the export properties of the node.
      * @param {Node} node

src/map/map.ts

@@ -101,6 +101,7 @@ export default class Map {
             addNode: this.nodes.addNode,
             selectNode: this.nodes.selectNode,
             deselectNode: this.nodes.deselectNode,
+            nodeChildren: this.nodes.nodeChildren,
             updateNode: this.nodes.updateNode,
             removeNode: this.nodes.removeNode,
             copyNode: this.copyPaste.copy,
@@ -127,6 +128,7 @@ export interface MmpInstance {
     addNode: Function;
     selectNode: Function;
     deselectNode: Function;
+    nodeChildren: Function;
     updateNode: Function;
     removeNode: Function;
     copyNode: Function;