Why does Google Analytics work?

Question

JavaScript

Hello everyone, there is a button, I give an event to it, but when you click on it, nothing is transferred to the analytics, tell me where the bug is

<fieldset onclick="ga('send', 'event', 'form', 'submit');" class="ec-form__field-btn">
            <input class="ec-btn ec-btn--red" type="submit" value="<?=Translate::t(13)?>">
          </fieldset>