const htmlEditor = $('#htmlEditorContainer').dxHtmlEditor('instance');

htmlEditor.registerKeyHandler('backspace', function(e) {
    // The argument 'e' contains information about the event
});
htmlEditor.registerKeyHandler('space', function(e) {
    // ...
});

import { ViewChild, AfterViewInit } from '@angular/core';
import { DxHtmlEditorComponent } from 'devextreme-angular/ui/html-editor';

@Component({
    imports: [DxHtmlEditorComponent],
    // ...
})
export class AppComponent implements AfterViewInit {
    @ViewChild(DxHtmlEditorComponent, { static: false }) htmlEditor!: DxHtmlEditorComponent;
    // Prior to Angular 8
    // @ViewChild(DxHtmlEditorComponent) htmlEditor: DxHtmlEditorComponent;

    ngAfterViewInit () {
        this.htmlEditor.instance.registerKeyHandler('backspace', function(e) {
            // The argument "e" contains information about the event
        });
        this.htmlEditor.instance.registerKeyHandler('space', function(e) {
            // ...
        });
    }
}

<template>
    <DxHtmlEditor ref="htmlEditorRef" />
</template>

<script setup lang="ts">
import { onMounted, ref } from 'vue';
import { DxHtmlEditor } from 'devextreme-vue/html-editor';

const htmlEditorRef = ref<DxHtmlEditor | null>(null);

onMounted(() => {
    htmlEditorRef.value.instance.registerKeyHandler('backspace', function(e) {
        // The argument "e" contains information about the event
    });
    htmlEditorRef.value.instance.registerKeyHandler('space', function(e) {
        // ...
    });
})

</script>

import React, { useRef, useEffect } from 'react';
import { HtmlEditor, type HtmlEditorRef } from 'devextreme-react/html-editor';

function App() {
    const htmlEditorRef = useRef<HtmlEditorRef>(null);

    useEffect(() => {
        const htmlEditor = htmlEditorRef.current.instance();
        htmlEditor.registerKeyHandler('backspace', function(e) {
            // The argument "e" contains information about the event
        });
        htmlEditor.registerKeyHandler('space', function(e) {
            // ...
        });
    }, []);

    return (
        <HtmlEditor ref={htmlEditorRef} />
    );
}