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SYS_I18n.addLanguageChangedEventListener() method

Add a language change event listener

Signature

function addLanguageChangedEventListener(
	id: string,
	callFn: (newLanguage: string, lastLanguage: string) => void | Promise<void>,
	onlyOnce: boolean,
): void;

Parameters

Parameter	Type	Description
id	string	Event ID, used to prevent duplicate event registration
callFn	(newLanguage: string, lastLanguage: string) => void | Promise<void>	The callback function triggered when the event fires
onlyOnce	boolean

Returns

void

Example

// 1. 注册语言切换监听（回调要等用户真实切换语言时才会触发）
eda.sys_I18n.addLanguageChangedEventListener(
	'嘉立创示例_语言监听',
	(newLanguage, lastLanguage) => {
		console.log('语言已切换：', lastLanguage, '→', newLanguage);
	},
	false,
);

// 2. 确认监听已注册
console.log('监听已注册：', eda.sys_I18n.isEventListenerAlreadyExist('嘉立创示例_语言监听'));

// 3. 移除监听，恢复原状（保证案例可重复运行）
console.log('已移除监听：', eda.sys_I18n.removeEventListener('嘉立创示例_语言监听'));