132 Option to insert properties/values at the beginning

README.md

@@ -150,6 +150,7 @@ The only *required* value is `data` (although you will need to provide a `setDat
 | `jsonStringify`         | `(data: JsonData) => string`                  | `(data) => JSON.stringify(data, null, 2)` | Similarly, you can override the default presentation of the JSON string when starting editing JSON. You can supply different formatting parameters to the native `JSON.stringify()`, or provide a third-party option, like the aforementioned JSON5.                                                                                                 |
 | `errorMessageTimeout`   | `number`                                      | `2500`                                    | Time (in milliseconds) to display the error message in the UI.                                                                                                                                                                                                                                                                                       |  |
 | `keyboardControls`      | `KeyboardControls`                            | As explained [above](#usage)              | Override some or all of the keyboard controls. See [Keyboard customisation](#keyboard-customisation) for details.                                                                                                                                                                                                                                    |  |
+| `insertAtTop`           | `boolean\| "object \| "array"`                | `false`                                   | If `true`, inserts new values at the *top* rather than bottom. Can set the behaviour just for arrays or objects by setting to `"object"` or `"array"` respectively.                                                                                                                                                                                  |  |
 
 ## Managing state
 
@@ -750,7 +751,9 @@ This component is heavily inspired by [react-json-view](https://github.com/mac-s
 
 ## Changelog
 
-- **1.18.0**: Ability to [customise keyboard controls](#keyboard-customisation)
+- **1.18.0**:
+  - Ability to [customise keyboard controls](#keyboard-customisation)
+  - Option to insert new values at the top
 - **1.17.0**: `defaultValue` function takes the new `key` as second parameter
 - **1.16.0**: Extend the "click" zone for collapsing nodes to the header bar and left margin (not just the collapse icon)
 - **1.15.12**:

demo/src/App.tsx

@@ -395,6 +395,7 @@ function App() {
               //   collapseModifier: 'Control',
               //   booleanConfirm: 'Enter',
               // }}
+              // insertAtBeginning="object"
             />
           </Box>
           <VStack w="100%" align="flex-end" gap={4}>

package.json

@@ -40,8 +40,8 @@
     "wrap-ansi": "7.0.0"
   },
   "dependencies": {
-    "object-property-assigner": "^1.3.1",
-    "object-property-extractor": "^1.0.12"
+    "object-property-assigner": "^1.3.5",
+    "object-property-extractor": "^1.0.13"
   },
   "devDependencies": {
     "@rollup/plugin-terser": "^0.4.4",

src/CollectionNode.tsx

@@ -46,6 +46,7 @@ export const CollectionNode: React.FC<CollectionNodeProps> = (props) => {
     jsonStringify,
     keyboardControls,
     handleKeyboard,
+    insertAtTop,
   } = props
   const [stringifiedValue, setStringifiedValue] = useState(jsonStringify(data))
 
@@ -171,13 +172,16 @@ export const CollectionNode: React.FC<CollectionNodeProps> = (props) => {
     animateCollapse(false)
     const newValue = getDefaultNewValue(nodeData, key)
     if (collectionType === 'array') {
-      onAdd(newValue, [...path, (data as unknown[]).length]).then((error) => {
+      const index = insertAtTop.array ? 0 : (data as unknown[]).length
+      const options = insertAtTop.array ? { insert: true } : {}
+      onAdd(newValue, [...path, index], options).then((error) => {
         if (error) onError({ code: 'ADD_ERROR', message: error }, newValue as CollectionData)
       })
     } else if (key in data) {
       onError({ code: 'KEY_EXISTS', message: translate('ERROR_KEY_EXISTS', nodeData) }, key)
     } else {
-      onAdd(newValue, [...path, key]).then((error) => {
+      const options = insertAtTop.object ? { insertBefore: 0 } : {}
+      onAdd(newValue, [...path, key], options).then((error) => {
         if (error) onError({ code: 'ADD_ERROR', message: error }, newValue as CollectionData)
       })
     }

src/JsonEditor.tsx

@@ -1,5 +1,5 @@
 import React, { useCallback, useEffect, useMemo, useState } from 'react'
-import assign, { type Input } from 'object-property-assigner'
+import assign, { type Options as AssignOptions, type Input } from 'object-property-assigner'
 import extract from 'object-property-extractor'
 import { CollectionNode } from './CollectionNode'
 import {
@@ -72,6 +72,7 @@ const Editor: React.FC<JsonEditorProps> = ({
   jsonStringify = (data: JsonData) => JSON.stringify(data, null, 2),
   errorMessageTimeout = 2500,
   keyboardControls = {},
+  insertAtTop = false,
 }) => {
   const { getStyles } = useTheme()
   const collapseFilter = useCallback(getFilterFunction(collapse), [collapse])
@@ -166,12 +167,13 @@ const Editor: React.FC<JsonEditorProps> = ({
     })
   }
 
-  const onAdd: InternalUpdateFunction = async (value, path) => {
+  const onAdd: InternalUpdateFunction = async (value, path, options) => {
     const { currentData, newData, currentValue, newValue } = updateDataObject(
       data,
       path,
       value,
-      'add'
+      'add',
+      options
     )
 
     return await handleEdit(srcAdd, {
@@ -237,7 +239,7 @@ const Editor: React.FC<JsonEditorProps> = ({
       [...targetPath, targetKey],
       currentValue,
       'add',
-      insertOptions as AssignOptions
+      insertOptions as UpdateOptions
     )
 
     return await handleEdit(srcEdit, {
@@ -304,6 +306,10 @@ const Editor: React.FC<JsonEditorProps> = ({
     errorMessageTimeout,
     handleKeyboard: handleKeyboardCallback,
     keyboardControls: fullKeyboardControls,
+    insertAtTop: {
+      object: insertAtTop === true || insertAtTop === 'object',
+      array: insertAtTop === true || insertAtTop === 'array',
+    },
   }
 
   const mainContainerStyles = { ...getStyles('container', nodeData), minWidth, maxWidth }
@@ -335,19 +341,19 @@ export const JsonEditor: React.FC<JsonEditorProps> = (props) => {
   )
 }
 
-interface AssignOptions {
+interface UpdateOptions {
   remove?: boolean
-  insert?: true
-  insertBefore?: string
-  insertAfter?: string
+  insert?: boolean
+  insertBefore?: string | number
+  insertAfter?: string | number
 }
 
 const updateDataObject = (
   data: JsonData,
   path: Array<string | number>,
   newValue: unknown,
   action: 'update' | 'delete' | 'add',
-  insertOptions: { insert?: true; insertBefore?: string; insertAfter?: string } = {}
+  insertOptions: AssignOptions = {}
 ) => {
   if (path.length === 0) {
     return {
@@ -358,7 +364,7 @@ const updateDataObject = (
     }
   }
 
-  const assignOptions: AssignOptions = {
+  const assignOptions: UpdateOptions = {
     remove: action === 'delete',
     ...insertOptions,
   }

src/types.ts

@@ -1,3 +1,4 @@
+import { type Options as AssignOptions } from 'object-property-assigner'
 import { type LocalisedStrings, type TranslateFunction } from './localisation'
 
 export type JsonData = CollectionData | ValueData
@@ -46,6 +47,7 @@ export interface JsonEditorProps {
   jsonStringify?: (input: JsonData) => string
   errorMessageTimeout?: number // ms
   keyboardControls?: KeyboardControls
+  insertAtTop?: boolean | 'array' | 'object'
 }
 
 const ValueDataTypes = ['string', 'number', 'boolean', 'null'] as const
@@ -140,7 +142,8 @@ export type CompareFunction = (a: string, b: string) => number
 // Internal update
 export type InternalUpdateFunction = (
   value: unknown,
-  path: CollectionKey[]
+  path: CollectionKey[],
+  options?: AssignOptions
 ) => Promise<string | void>
 
 // For drag-n-drop
@@ -236,6 +239,7 @@ export interface CollectionNodeProps extends BaseNodeProps {
   defaultValue: unknown
   jsonParse: (input: string) => JsonData
   jsonStringify: (data: JsonData) => string
+  insertAtTop: { object: boolean; array: boolean }
 }
 
 export type ValueData = string | number | boolean

yarn.lock

@@ -2433,12 +2433,12 @@ object-keys@^1.1.1:
   resolved "https://registry.yarnpkg.com/object-keys/-/object-keys-1.1.1.tgz#1c47f272df277f3b1daf061677d9c82e2322c60e"
   integrity sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==
 
-object-property-assigner@^1.3.1:
-  version "1.3.2"
-  resolved "https://registry.yarnpkg.com/object-property-assigner/-/object-property-assigner-1.3.2.tgz#9630ab7cb39e8507c0a836771863b7eb3790b216"
-  integrity sha512-zhRYPERkZMJ2SATAFVIJLBTfWMd8r2dR4sgpAiObgEfL7YnsAhPPOQChH97pf+rfIwOWgtJsz1TDadOQQgjQzA==
+object-property-assigner@^1.3.5:
+  version "1.3.5"
+  resolved "https://registry.yarnpkg.com/object-property-assigner/-/object-property-assigner-1.3.5.tgz#f5037ff73b7b015a42e4059c3ff5c84017413ca2"
+  integrity sha512-DIzHzNSTnpoG8QPQCDNrHa6O3vLMhktK3Igirqpk523UYIVe8JNCKcn5C9WyLQxJc58EGsAIiiEu10gqPrud8w==
 
-object-property-extractor@^1.0.12:
+object-property-extractor@^1.0.13:
   version "1.0.13"
   resolved "https://registry.yarnpkg.com/object-property-extractor/-/object-property-extractor-1.0.13.tgz#fff188d6308ac5574eb2610221af906eb87b4f38"
   integrity sha512-9kgEjTWDhTPuPn7nyof+5mLmCKBPKdU0c7IVpTbOvYKYSdXQ5skH4Pa/8MPbZXeyXBGrqS82JyWecsh6tMxiLw==