Add Up and Down arrow functionality to chat messages (#3440)

* Add Up and Down arrow functionality to chat messages

- Works like Linux shell
- History limited to 10 messages

* Fix linting errors

* Update EmbedChat.jsx

---------

Co-authored-by: Henry Heng <henryheng@flowiseai.com>

packages/ui/src/views/chatmessage/ChatInputHistory.js

@@ -0,0 +1,62 @@
+export class ChatInputHistory {
+    constructor(maxHistory = 10) {
+        this.history = []
+        this.currentIndex = -1
+        this.tempInput = ''
+        this.maxHistory = maxHistory
+        this.loadHistory()
+    }
+
+    addToHistory(input) {
+        if (!input.trim()) return
+        if (this.history[0] !== input) {
+            this.history.unshift(input)
+            if (this.history.length > this.maxHistory) {
+                this.history.pop()
+            }
+        }
+        this.currentIndex = -1
+        this.saveHistory()
+    }
+
+    getPreviousInput(currentInput) {
+        if (this.currentIndex === -1) {
+            this.tempInput = currentInput
+        }
+        if (this.currentIndex < this.history.length - 1) {
+            this.currentIndex++
+            return this.history[this.currentIndex]
+        }
+        return this.history[this.currentIndex] || this.tempInput
+    }
+
+    getNextInput() {
+        if (this.currentIndex > -1) {
+            this.currentIndex--
+            if (this.currentIndex === -1) {
+                return this.tempInput
+            }
+            return this.history[this.currentIndex]
+        }
+        return this.tempInput
+    }
+
+    saveHistory() {
+        try {
+            localStorage.setItem('chatInputHistory', JSON.stringify(this.history))
+        } catch (error) {
+            console.warn('Failed to save chat history to localStorage:', error)
+        }
+    }
+
+    loadHistory() {
+        try {
+            const saved = localStorage.getItem('chatInputHistory')
+            if (saved) {
+                this.history = JSON.parse(saved)
+            }
+        } catch (error) {
+            console.warn('Failed to load chat history from localStorage:', error)
+        }
+    }
+}

packages/ui/src/views/chatmessage/ChatMessage.jsx

@@ -83,6 +83,9 @@ import { isValidURL, removeDuplicateURL, setLocalStorageChatflow, getLocalStorag
 import useNotifier from '@/utils/useNotifier'
 import FollowUpPromptsCard from '@/ui-component/cards/FollowUpPromptsCard'
 
+// History
+import { ChatInputHistory } from './ChatInputHistory'
+
 const messageImageStyle = {
     width: '128px',
     height: '128px',
@@ -185,6 +188,7 @@ export const ChatMessage = ({ open, chatflowid, isAgentCanvas, isDialog, preview
     const [uploadedFiles, setUploadedFiles] = useState([])
     const [imageUploadAllowedTypes, setImageUploadAllowedTypes] = useState('')
     const [fileUploadAllowedTypes, setFileUploadAllowedTypes] = useState('')
+    const [inputHistory] = useState(new ChatInputHistory(10))
 
     const inputRef = useRef(null)
     const getChatmessageApi = useApi(chatmessageApi.getInternalChatmessageFromChatflow)
@@ -768,6 +772,10 @@ export const ChatMessage = ({ open, chatflowid, isAgentCanvas, isDialog, preview
 
         if (selectedInput !== undefined && selectedInput.trim() !== '') input = selectedInput
 
+        if (input.trim()) {
+            inputHistory.addToHistory(input)
+        }
+
         setLoading(true)
         let uploads = previews.map((item) => {
             return {
@@ -934,7 +942,15 @@ export const ChatMessage = ({ open, chatflowid, isAgentCanvas, isDialog, preview
     const handleEnter = (e) => {
         // Check if IME composition is in progress
         const isIMEComposition = e.isComposing || e.keyCode === 229
-        if (e.key === 'Enter' && userInput && !isIMEComposition) {
+        if (e.key === 'ArrowUp' && !isIMEComposition) {
+            e.preventDefault()
+            const previousInput = inputHistory.getPreviousInput(userInput)
+            setUserInput(previousInput)
+        } else if (e.key === 'ArrowDown' && !isIMEComposition) {
+            e.preventDefault()
+            const nextInput = inputHistory.getNextInput()
+            setUserInput(nextInput)
+        } else if (e.key === 'Enter' && userInput && !isIMEComposition) {
             if (!e.shiftKey && userInput) {
                 handleSubmit(e)
             }