npm i @fuzzco/in-view

Demo

In your Vue component:

<script>
    import inView from '../src'

    export default {
        mixins: [inView],
        mounted() {
            // call the `inView` method and specify a selector
            this.inView('p')

            // or a selector and delay in ms if multiple enter the viewport at once
            this.inView('p', 100)

            // can also pass an object of opts (see below for defaults)
            this.inView({
                selector: 'p',
                once: true
            })
        }
    }
</script>

Defaults

{
    // pass in DOM node(s) to use directly
    // (doing so ignores `selector`)
    // el for a single node...
    el: null,
    // ...els for an array of nodes
    els: null,

    // single selector - see below
    selector: '',

    // array of selectors for this group
    // if "selector" is set, will create an array from "selector"
    selectors: [],

    // delay between callbacks if multiple instances of this group come in view at once
    delay: 0,

    // run immediately on initialization
    run: true,

    // each callback accepts one parameter, the element in view
    // the defaults set the class to `above-view`, `in-view`, or `below-view`
    onEnter: el => {},
    onLeaveTop: el => {},
    onLeaveBottom: el => {},

    // run in-view callback only once per node
    once: false
}

See demo/App.vue for usage.

Methods

Name	Params	Notes
inView	(options = {}, delay = 0)	options can be a string or object. delay is overridden by options.delay if provided. Register an element or group of elements for in-view events. See above for options values.
updateInView	None	Recalculate items in view. Called automatically on scroll, mousewheel, and resize, but can also be called manually.