/ Miscellaneous

Detect when an element is becoming visible or hidden on the page

Detect when an element is becoming visible or hidden on the page

vue-observe-visibility

Vue 2.x directive using Intersection Observer API that detects if the element is visible (in the viewport and not hidden by CSS).

Installation

npm install --save vue-observe-visibility

This also works on components:

```html
<MyComponent v-observe-visibility="visibilityChanged" />

The function will be called whenever the visiblity of the element changes with the argument being a boolean (true means the element is visible on the page, false means that it is not).

The second argument is the corresponding IntersectionObserverEntry object.

visibilityChanged (isVisible, entry) {
  this.isVisible = isVisible
  console.log(entry)
}

Passing custom arguments

You can add custom argument by using an intermediate function:

<div v-observe-visibility="(isVisible, entry) => visibilityChanged(isVisible, entry, customArgument)">

Here visibilityChanged will be call with a third custom argument customArgument.

Example

<div id="app">
  <button @click="show = !show">Toggle</button>
  <label>
    <input type="checkbox" v-model="isVisible" disabled/> Is visible?
  </label>
  <div ref="test" v-show="show" v-observe-visibility="visibilityChanged">Hello world!</div>
</div>

<script>
new Vue({
  el: '#app',
  data: {
    show: true,
    isVisible: true,
  },
  methods: {
    visibilityChanged (isVisible, entry) {
      this.isVisible = isVisible
      console.log(entry)
    },
  },
})
</script>

GitHub