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* Copyright (c) Siemens 2016 - 2026
* SPDX-License-Identifier: MIT
*/
import { CdkMenuTrigger } from '@angular/cdk/menu';
import {
afterRenderEffect,
AfterViewInit,
booleanAttribute,
Component,
computed,
ElementRef,
input,
model,
output,
signal,
viewChild
} from '@angular/core';
import { FormsModule } from '@angular/forms';
import {
elementAttachment,
elementCheckedFilled,
elementPlus,
elementSendFilled,
elementStateClose,
elementStopFilled,
elementVoice
} from '@siemens/element-icons';
import {
SiFileUploadDirective,
UploadFile,
FileUploadError
} from '@siemens/element-ng/file-uploader';
import { addIcons, SiIconComponent } from '@siemens/element-ng/icon';
import { MenuItem, SiMenuFactoryComponent } from '@siemens/element-ng/menu';
import { SiTooltipDirective } from '@siemens/element-ng/tooltip';
import { SiTranslatePipe, TranslatableString, t } from '@siemens/element-translate-ng/translate';
import { MessageAction } from './message-action.model';
import { Attachment, SiAttachmentListComponent } from './si-attachment-list.component';
import { SiVoiceWaveformComponent } from './si-voice-waveform.component';
/**
* Attachment item interface for file attachments in chat messages, extension of {@link Attachment} for {@link SiAttachmentListComponent} to use within {@link SiChatInputComponent}.
* Adds the action file information.
* Can be used within {@link SiChatContainerComponent}.
*
* @see {@link Attachment} for base attachment interface
* @see {@link SiAttachmentListComponent} for the attachment list component
* @see {@link SiChatInputComponent} for the chat input component
* @see {@link SiChatContainerComponent} for the chat container component
*
* @experimental
*/
export interface ChatInputAttachment extends Attachment {
/** File object */
file: File;
/** File size in bytes */
size: number;
/** MIME type */
type: string;
}
/**
* Chat input component for composing and sending messages in conversational interfaces.
*
* The chat input component provides a text area for users to compose messages,
* supporting text, attachments, and contextual actions. It appears as a textarea
* with buttons for adding attachments and sending messages, as well as an optional disclaimer.
*
* The component automatically handles:
* - Styling for chat input and actions.
* - Dynamic resizing of the textarea based on content.
* - Uploading of and displaying of attachments above the input area.
* - Displaying primary and secondary actions.
*
* Additionally to the inputs and outputs documented here, the component supports content projection via the following slots:
* - Default content: Custom action buttons to display inline, prefer using the `actions` input for buttons, can be used in addition.
* - `siChatInputDisclaimer` selector: Custom disclaimer content to display below the input area, prefer using the `disclaimer` input for simple text disclaimers.
*
* @see {@link SiAttachmentListComponent} for the base attachment component
* @see {@link SiChatInputDisclaimerDirective} to slot in custom disclaimer content
*
* @experimental
*/
@Component({
selector: 'si-chat-input',
imports: [
CdkMenuTrigger,
FormsModule,
SiIconComponent,
SiTranslatePipe,
SiAttachmentListComponent,
SiMenuFactoryComponent,
SiFileUploadDirective,
SiTooltipDirective,
SiVoiceWaveformComponent
],
templateUrl: './si-chat-input.component.html',
styleUrl: './si-chat-input.component.scss'
})
export class SiChatInputComponent implements AfterViewInit {
private static idCounter = 0;
private readonly textInput = viewChild<ElementRef<HTMLTextAreaElement>>('textInput');
private readonly voiceButton = viewChild<ElementRef<HTMLButtonElement>>('voiceButton');
private readonly submitButton = viewChild<ElementRef<HTMLButtonElement>>('submitButton');
private readonly fileUploadDirective = viewChild(SiFileUploadDirective);
protected readonly fileInput = viewChild<ElementRef<HTMLInputElement>>('fileInput');
protected readonly icons = addIcons({
elementAttachment,
elementCheckedFilled,
elementPlus,
elementSendFilled,
elementStateClose,
elementStopFilled,
elementVoice
});
/**
* Current input value
* @defaultValue ''
*/
readonly value = model<string>('');
/**
* Whether voice input controls are available. Speech recognition is managed by the consumer.
* @defaultValue false
*/
readonly voiceInput = input(false, { transform: booleanAttribute });
/**
* Consumer-controlled voice input state. Use listening during startup and while awaiting speech,
* and recording when transcription starts. Stream transcript updates through {@link value}.
* @defaultValue 'idle'
*/
readonly voiceInputState = input<'idle' | 'listening' | 'recording'>('idle');
/**
* Latest normalized audio level, from 0 (silence) to 1 (maximum volume).
* Omit to use simulated speech bursts while recording. Audio capture is managed by the consumer.
* @defaultValue undefined
*/
readonly voiceInputLevel = input<number>();
/**
* Start dictation button label.
* @defaultValue
* ```
* t(() => $localize`:@@SI_CHAT_INPUT.START_DICTATION:Start dictation`)
* ```
*/
readonly startDictationLabel = input<TranslatableString>(
t(() => $localize`:@@SI_CHAT_INPUT.START_DICTATION:Start dictation`)
);
/**
* Cancel dictation button label.
* @defaultValue
* ```
* t(() => $localize`:@@SI_CHAT_INPUT.CANCEL_DICTATION:Cancel dictation`)
* ```
*/
readonly cancelDictationLabel = input<TranslatableString>(
t(() => $localize`:@@SI_CHAT_INPUT.CANCEL_DICTATION:Cancel dictation`)
);
/**
* Confirm dictation button label.
* @defaultValue
* ```
* t(() => $localize`:@@SI_CHAT_INPUT.CONFIRM_DICTATION:Confirm dictation`)
* ```
*/
readonly confirmDictationLabel = input<TranslatableString>(
t(() => $localize`:@@SI_CHAT_INPUT.CONFIRM_DICTATION:Confirm dictation`)
);
/**
* Placeholder while waiting for speech.
* @defaultValue
* ```
* t(() => $localize`:@@SI_CHAT_INPUT.LISTENING:Listening…`)
* ```
*/
readonly listeningLabel = input<TranslatableString>(
t(() => $localize`:@@SI_CHAT_INPUT.LISTENING:Listening…`)
);
/** Requests that the consumer start speech recognition. Does not change the state or value. */
readonly voiceInputStart = output<void>();
/** Requests that the consumer stop recognition and keep the transcript for review, without sending. */
readonly voiceInputConfirm = output<void>();
/** Requests that the consumer stop recognition and restore the draft from before dictation. */
readonly voiceInputCancel = output<void>();
/**
* Placeholder text for the input
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_CHAT_INPUT.PLACEHOLDER:Enter a message…`)
* ```
*/
readonly placeholder = input<TranslatableString>(
t(() => $localize`:@@SI_CHAT_INPUT.PLACEHOLDER:Enter a message…`)
);
/**
* Whether the input is disabled
* @defaultValue false
*/
readonly disabled = input(false, { transform: booleanAttribute });
/**
* Whether a message is currently being sent, also prevent the sending of new ones while still allowing the user to type
* @defaultValue false
*/
readonly sending = input(false, { transform: booleanAttribute });
/**
* Whether the input supports interrupting ongoing operations. When active,
* the send button transforms into an interrupt button (with element-stop-filled icon).
* If sending is true, the interrupt button will be disabled.
* @defaultValue false
*/
readonly interruptible = input(false, { transform: booleanAttribute });
/**
* Maximum number of characters allowed
*/
readonly maxLength = input<number>();
/**
* A disclaimer to display.
*
* If not provided, the component will look for projected content with the `siChatInputDisclaimer` directive.
* If both are empty, no disclaimer section will be shown (handled via CSS :empty).
*/
readonly disclaimer = input<TranslatableString>();
/**
* Primary actions available in the input. Provide at most one action.
* @defaultValue []
*/
readonly actions = input<MessageAction[]>([]);
/**
* Secondary actions available in dropdown menu
* @defaultValue []
*/
readonly secondaryActions = input<MenuItem[]>([]);
/**
* Whether file attachments are supported
* @defaultValue false
*/
readonly allowAttachments = input(false);
/**
* Accepted file types for attachments (as accept string)
* @defaultValue undefined
*/
readonly accept = input<string>();
/**
* Maximum file size in bytes
* @defaultValue 10485760 (10MB)
*/
readonly maxFileSize = input(10485760);
/**
* Current attachments
* @defaultValue []
*/
readonly attachments = model<ChatInputAttachment[]>([]);
/**
* The label for the input, used for accessibility
* @defaultValue
* ```
* t(() => $localize`:@@SI_CHAT_INPUT.LABEL:Chat input`)
* ```
*/
readonly label = input<string>(t(() => $localize`:@@SI_CHAT_INPUT.LABEL:Chat input`));
/** Parameter to pass to action handlers */
readonly actionParam = input<any>();
/**
* Send button label
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_CHAT_INPUT.SEND:Send`)
* ```
*/
readonly sendButtonLabel = input<TranslatableString>(
t(() => $localize`:@@SI_CHAT_INPUT.SEND:Send`)
);
/**
* Send button icon
*
* @defaultValue this.icons.elementSendFilled
*/
readonly sendButtonIcon = input(this.icons.elementSendFilled);
/**
* Interrupt button label
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_CHAT_INPUT.INTERRUPT:Stop processing`)
* ```
*/
readonly interruptButtonLabel = input<TranslatableString>(
t(() => $localize`:@@SI_CHAT_INPUT.INTERRUPT:Stop processing`)
);
/**
* Auto-focus the input on component initialization
* @defaultValue false
*/
readonly autoFocus = input(false, { transform: booleanAttribute });
/**
* Attach file button aria label
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_CHAT_INPUT.ATTACH_FILE:Attach file`)
* ```
*/
readonly attachFileLabel = input<TranslatableString>(
t(() => $localize`:@@SI_CHAT_INPUT.ATTACH_FILE:Attach file`)
);
/**
* Remove attachment aria label.
* The attachment name is available with `{{attachment}}`.
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_ATTACHMENT_LIST.REMOVE_ATTACHMENT:Remove {{attachment}}`)
* ```
*/
readonly removeAttachmentLabel = input<TranslatableString>(
t(() => $localize`:@@SI_ATTACHMENT_LIST.REMOVE_ATTACHMENT:Remove {{attachment}}`)
);
/**
* More actions button aria label
*
* @defaultValue
* ```
* t(() => $localize`:@@SI_CHAT_INPUT.SECONDARY_ACTIONS:Additional actions`)
* ```
*/
readonly secondaryActionsLabel = input<TranslatableString>(
t(() => $localize`:@@SI_CHAT_INPUT.SECONDARY_ACTIONS:Additional actions`)
);
/**
* Suggested follow-up prompts to display as pill buttons above the chat input.
* Use `followUpPromptSelected` to handle selection and update the input value.
* Typically populated from AI response data and cleared after selection or on send.
* @defaultValue []
*/
readonly followUpPrompts = input<string[]>([]);
/**
* Emitted when the user selects a follow-up prompt.
* The emitted value is the text of the selected prompt.
*/
readonly followUpPromptSelected = output<string>();
/**
* Emitted when the user wants to send a message
*/
readonly send = output<{
content: string;
attachments: ChatInputAttachment[];
}>();
/**
* Emitted when the user wants to interrupt the current operation
*/
readonly interrupt = output<void>();
/**
* Emitted when file upload errors occur
*/
readonly fileError = output<FileUploadError>();
protected readonly id = `__si-chat-input-${SiChatInputComponent.idCounter++}`;
protected readonly hasContent = computed(() => this.value().trim().length > 0);
protected readonly hasAttachments = computed(() => this.attachments().length > 0);
protected readonly hasActions = computed(() => this.actions().length > 0);
protected readonly voiceActive = computed(
() => this.voiceInput() && this.voiceInputState() !== 'idle'
);
protected readonly voiceRecording = computed(
() => this.voiceActive() && this.voiceInputState() === 'recording'
);
protected readonly voiceButtonLabel = computed(() =>
this.voiceActive() ? this.cancelDictationLabel() : this.startDictationLabel()
);
protected readonly hasSecondaryActions = computed(() => this.secondaryActions().length > 0);
protected readonly combinedMenuActions = computed<MenuItem[]>(() => [
...(this.allowAttachments()
? [
{
type: 'action' as const,
label: this.attachFileLabel(),
icon: this.icons.elementAttachment,
disabled: this.disabled(),
action: () => this.triggerFileInput()
} satisfies MenuItem
]
: []),
...this.secondaryActions()
]);
protected readonly hasMenuActions = computed(() => this.hasSecondaryActions());
protected triggerFileInput(): void {
this.fileInput()?.nativeElement.click();
}
protected readonly canSend = computed(
() =>
(this.hasContent() || this.hasAttachments()) &&
!this.disabled() &&
!this.sending() &&
!this.voiceActive()
);
protected readonly showInterruptButton = computed(
() => this.interruptible() && !this.voiceActive()
);
protected readonly buttonDisabled = computed(() => {
if (this.voiceActive()) {
return this.disabled() || !this.voiceRecording();
}
if (this.showInterruptButton()) {
return this.disabled() || this.sending();
}
return !this.canSend();
});
protected readonly buttonIcon = computed(() =>
this.voiceRecording()
? this.icons.elementCheckedFilled
: this.showInterruptButton()
? this.icons.elementStopFilled
: this.sendButtonIcon()
);
protected readonly buttonLabel = computed(() =>
this.voiceRecording()
? this.confirmDictationLabel()
: this.showInterruptButton()
? this.interruptButtonLabel()
: this.sendButtonLabel()
);
protected readonly dragOver = signal(false);
constructor() {
afterRenderEffect(() => {
this.value();
const textarea = this.textInput()?.nativeElement;
Eif (textarea) {
this.setTextareaHeight(textarea);
}
});
let previousState = 'idle';
afterRenderEffect(() => {
const state = this.voiceActive() ? this.voiceInputState() : 'idle';
if (state === previousState) {
return;
}
previousState = state;
if (this.disabled()) {
return;
}
const textarea = this.textInput()?.nativeElement;
const voiceButton = this.voiceButton()?.nativeElement;
const submitButton = this.submitButton()?.nativeElement;
const activeElement = textarea?.ownerDocument.activeElement;
if (
activeElement !== textarea &&
activeElement !== voiceButton &&
activeElement !== submitButton
) {
return;
}
if (state === 'idle') {
textarea?.focus();
textarea?.setSelectionRange(textarea.value.length, textarea.value.length);
} else {
const button = state === 'listening' ? voiceButton : submitButton;
button?.focus();
}
});
}
protected selectFollowUpPrompt(prompt: string): void {
this.followUpPromptSelected.emit(prompt);
this.focus();
}
protected onSend(): void {
Eif (this.canSend()) {
this.send.emit({
content: this.value(),
attachments: this.attachments()
});
this.value.set('');
this.attachments.set([]);
}
}
protected onButtonClick(): void {
Iif (this.disabled()) {
return;
}
if (this.voiceActive()) {
if (this.voiceRecording()) {
this.voiceInputConfirm.emit();
}
return;
}
if (this.showInterruptButton()) {
this.interrupt.emit();
} else {
this.onSend();
}
}
protected onKeyDown(event: KeyboardEvent): void {
if (event.isComposing || this.disabled()) {
return;
}
if (event.key === 'Enter' && !event.shiftKey) {
event.preventDefault();
if (event.repeat) {
return;
}
if (this.voiceActive()) {
this.onButtonClick();
return;
}
Iif (!this.canSend()) {
return;
}
if (this.showInterruptButton()) {
this.interrupt.emit();
}
this.onSend();
}
}
protected onVoiceButtonClick(): void {
Iif (this.disabled() || (!this.voiceActive() && (this.sending() || this.interruptible()))) {
return;
}
if (this.voiceActive()) {
this.voiceInputCancel.emit();
} else {
this.voiceInputStart.emit();
}
}
protected onVoiceKeyDown(event: KeyboardEvent): void {
if (
event.key === 'Enter' &&
!event.shiftKey &&
event.repeat &&
!event.isComposing &&
(event.target === this.voiceButton()?.nativeElement ||
event.target === this.submitButton()?.nativeElement)
) {
event.preventDefault();
return;
}
if (event.key === 'Escape' && this.voiceActive() && !this.disabled() && !event.isComposing) {
event.preventDefault();
event.stopPropagation();
this.voiceInputCancel.emit();
}
}
protected onInput(event: Event): void {
this.setTextareaHeight(event.target as HTMLTextAreaElement);
}
protected onFilesAdded(uploadFiles: UploadFile[]): void {
const validFiles = uploadFiles.filter(uploadFile => uploadFile.status === 'added');
validFiles.forEach(uploadFile => {
const size = parseInt(uploadFile.size, 10);
const attachment: ChatInputAttachment = {
name: uploadFile.fileName,
size: isNaN(size) ? uploadFile.file.size : size,
type: uploadFile.file.type,
file: uploadFile.file
};
this.attachments.update(current => [...current, attachment]);
});
}
protected onFileError(error: FileUploadError): void {
this.fileError.emit(error);
}
protected removeAttachment(attachment: Attachment): void {
this.attachments.update(current => {
return current.filter(a => a !== attachment);
});
}
protected onContainerClick(event: Event): void {
const target = event.target as HTMLElement;
// Don't focus if clicking on interactive elements
Eif (
target.tagName === 'BUTTON' ||
target.tagName === 'INPUT' ||
target.tagName === 'TEXTAREA' ||
target.closest('button') ||
target.closest('[siChatMessageAction]') ||
(target.closest('si-attachment-list') && target.closest('.attachment-item'))
) {
return;
}
this.focus();
}
ngAfterViewInit(): void {
const textarea = this.textInput();
Eif (textarea?.nativeElement) {
Iif (this.autoFocus() && !this.voiceActive()) {
// Use setTimeout to ensure the element is fully rendered
setTimeout(() => {
textarea.nativeElement.focus();
}, 0);
}
}
}
/**
* Focus the textarea input
*/
focus(): void {
const textarea = this.textInput();
Eif (textarea?.nativeElement) {
textarea.nativeElement.focus();
}
}
protected dropHandler(event: DragEvent): void {
event.preventDefault();
event.stopPropagation();
this.dragOver.set(false);
if (!this.allowAttachments() || this.disabled()) {
return;
}
const directive = this.fileUploadDirective();
if (directive && event.dataTransfer?.files) {
directive.handleFiles(event.dataTransfer.files);
}
}
protected dragOverHandler(event: DragEvent): void {
if (!this.allowAttachments() || this.disabled()) {
return;
}
event.preventDefault();
event.stopPropagation();
this.dragOver.set(true);
}
private setTextareaHeight(textarea: HTMLTextAreaElement): void {
textarea.style.blockSize = 'auto';
const computedStyle = window.getComputedStyle(textarea);
const lineHeight =
parseInt(computedStyle.lineHeight, 10) || parseInt(computedStyle.fontSize, 10) * 1.2;
const paddingTop = parseInt(computedStyle.paddingBlockStart, 10) || 0;
const paddingBottom = parseInt(computedStyle.paddingBlockEnd, 10) || 0;
const minHeight = lineHeight + paddingTop + paddingBottom;
const viewportHeight = window.innerHeight;
const maxViewportHeight = viewportHeight * 0.3;
const maxLinesHeight = lineHeight * 8;
const maxHeight = Math.min(maxViewportHeight, maxLinesHeight) + paddingTop + paddingBottom;
const scrollHeight = textarea.scrollHeight;
const finalHeight = Math.max(Math.min(scrollHeight, maxHeight), minHeight);
textarea.style.height = finalHeight + 'px';
}
}
|