How to Create a Custom Scroll Event in Vue

You can handle scrolling in Vue with custom directives. Below is a live example of a Vue instance that prints the current value of window.scrollY. Scroll down and the value below should increment.

Below is the JavaScript code. Calling Vue.directive('scroll') registers a v-scroll directive that you can use in your HTML templates. And binding.value contains the computed value of the v-scroll attribute. In the below case, binding.value points to the handleScroll() method.

Vue.directive('scroll', {
  inserted: function (el, binding) {
    const onScrollCallback = binding.value; 
    window.addEventListener('scroll', () => onScrollCallback());
  }
});
// main app
new Vue({
  el: '#app',
  data: {
    value: 0
  },
  methods: {
    handleScroll: function() {
      this.value = window.scrollY;
    }
  }
});

Below is the HTML template. Note that v-scroll needs to be a function.

<div id="app">
  <h1>Scroll and Watch</h1>
  <div v-scroll="handleScroll">
    <p>The value of <code>window.scrollY</code>: {{ value }}!</p>
  </div>
</div>

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