Adjust the CSS property of a div to have a fixed position when scrolling

I attempted to implement a fixed div on scroll in Vue.js using the following code:

...
async created() {
    window.addEventListener('scroll', this.calendarScroll);
}
methods: {
    calendarScroll() {
    console.log('Scroll');
    const dateHeader = document.querySelector('.dates-header');
    if (dateHeader) {
      if (window.scrollTop() >= 200) {
        dateHeader.style.top = 0;
        dateHeader.style.position = 'fixed';
      }
    }
  },
}

The issue that arises is:

Calendar.vue?404a:681 Uncaught TypeError: window.scrollTop is not a function

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