Skip to content

refactor(chat-messages): use CdkTextareaAutosize for chat input #2112

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
chintankavathia wants to merge 1 commit into
base: main
Choose a base branch
from
+12 −35
Open

refactor(chat-messages): use CdkTextareaAutosize for chat input #2112

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 3 additions & 1 deletion projects/element-ng/chat-messages/si-chat-input.component.html
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,9 @@
<label class="form-label d-none" [for]="id">{{ label() | translate }}</label>
<textarea
#textInput
cdkTextareaAutosize
cdkAutosizeMinRows="1"
cdkAutosizeMaxRows="8"
class="chat-textarea w-100 border-0"
rows="1"
[id]="id"
Expand All @@ -27,7 +30,6 @@
[maxlength]="maxLength() || null"
[(ngModel)]="value"
(keydown)="onKeyDown($event)"
(input)="adjustTextareaHeight($event)"
></textarea>
</div>

Expand Down
2 changes: 2 additions & 0 deletions projects/element-ng/chat-messages/si-chat-input.component.scss
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -29,11 +29,13 @@
.chat-textarea {
// Prevent layout shift on first input
min-block-size: 1lh;
max-block-size: 30vh;
font-family: inherit;
padding-block: 0;
display: block;
outline: none;
resize: none;
overflow-y: auto;
Comment thread
chintankavathia marked this conversation as resolved.

@spike-rabbit spike-rabbit Jun 19, 2026

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I don't think this is needed

background-color: transparent;

&::placeholder {
Expand Down
41 changes: 7 additions & 34 deletions projects/element-ng/chat-messages/si-chat-input.component.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
* SPDX-License-Identifier: MIT
*/
import { CdkMenuTrigger } from '@angular/cdk/menu';
import { CdkTextareaAutosize } from '@angular/cdk/text-field';
import {
AfterViewInit,
booleanAttribute,
Expand Down Expand Up @@ -80,6 +81,7 @@ export interface ChatInputAttachment extends Attachment {
selector: 'si-chat-input',
imports: [
CdkMenuTrigger,
CdkTextareaAutosize,
FormsModule,
SiIconComponent,
SiTranslatePipe,
Expand Down Expand Up @@ -436,23 +438,14 @@ export class SiChatInputComponent implements AfterViewInit {

ngAfterViewInit(): void {
const textarea = this.textInput();
if (textarea?.nativeElement) {
this.setTextareaHeight(textarea.nativeElement);

if (this.autoFocus()) {
// Use setTimeout to ensure the element is fully rendered
setTimeout(() => {
textarea.nativeElement.focus();
}, 0);
}
if (textarea?.nativeElement && this.autoFocus()) {
// Use setTimeout to ensure the element is fully rendered
setTimeout(() => {
textarea.nativeElement.focus();
}, 0);
}
}

protected adjustTextareaHeight(event: Event): void {
const textarea = event.target as HTMLTextAreaElement;
this.setTextareaHeight(textarea);
}

/**
* Focus the textarea input
*/
Expand Down Expand Up @@ -487,24 +480,4 @@ export class SiChatInputComponent implements AfterViewInit {
event.stopPropagation();
this.dragOver = 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';
}
}
Loading