carbon/src/js/chat-input.js

import {q} from "./basic.js"
import {store} from "./store/store.js"
import * as lsm from "./lsm.js"
import {chat} from "./chat.js"

let sentIndex = 0

const input = q("#c-chat-textarea")

store.activeRoom.subscribe("changeSelf", () => {
	if (store.activeRoom.exists()) {
		input.focus()
	}
})

input.addEventListener("keydown", event => {
	if (event.key === "Enter" && !event.shiftKey && !event.ctrlKey) {
		event.preventDefault()
		const body = input.value
		send(input.value)
		input.value = ""
		fixHeight()
	}
})

input.addEventListener("input", () => {
	fixHeight()
})

function fixHeight() {
	input.style.height = "0px"
	// console.log(input.clientHeight, input.scrollHeight)
	input.style.height = (input.scrollHeight + 1) + "px"
}

function getTxnId() {
	return Date.now() + (sentIndex++)
}

function send(body) {
	if (!store.activeRoom.exists()) return
	const id = store.activeRoom.value().id
	return fetch(`${lsm.get("domain")}/_matrix/client/r0/rooms/${id}/send/m.room.message/${getTxnId()}?access_token=${lsm.get("access_token")}`, {
		method: "PUT",
		body: JSON.stringify({
			msgtype: "m.text",
			body
		}),
		headers: {
			"Content-Type": "application/json"
		}
	})
}