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/**
* Returns the editor iframe element, or null if not found.
* @returns {HTMLElement | null}
*/
const getEditorIframe = (): HTMLIFrameElement | null => {
const editorIframe = document.querySelector< HTMLIFrameElement >(
'iframe[name="editor-canvas"]'
);
return editorIframe || null;
};
/**
* Check if the Editor iframe is focused.
* @returns {boolean} Whether the editor iframe has focus.
*/
export const isEditorIframeFocused = (): boolean => {
const editorIframe = getEditorIframe();
const iframeFocused =
editorIframe?.contentDocument?.activeElement?.getAttribute( 'contenteditable' ) === 'true';
return !! iframeFocused;
};
/**
* Focus the Editor iframe if possible.
* @returns {void}
*/
export const focusEditor = (): void => {
if ( isEditorIframeFocused() ) {
return;
}
const attemptFocus = () => {
const editorIframe = getEditorIframe();
const editable = editorIframe?.contentDocument?.querySelector< HTMLElement >(
'[contenteditable="true"]'
);
if ( ! editable ) {
return false;
}
editable.focus();
return true;
};
// If immediate focus attempt fails, watch for DOM changes until
// the editor becomes available, then focus and auto-disconnect.
if ( ! attemptFocus() ) {
const observer = new MutationObserver( ( _, obs ) => {
if ( attemptFocus() ) {
obs.disconnect();
}
} );
observer.observe( document.body, { childList: true, subtree: true } );
// Failsafe disconnect and give up after 30 seconds.
setTimeout( () => observer.disconnect(), 30000 );
}
};
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