vue-scroll-context

Vue directive that passes some positioning context to a callback

Usage

Import the directive and register it in your component

import { directive } from 'vue-scroll-context';
export default {
    name: 'Example',
    directives: {
        scrollContext: directive,
    }
}

Add the now registered v-scroll-context directive (or whatever you have called it) to your element and pass it a callback (required). You can also provide params to be passed into the callback. You can also pass in the throttle value which will be passed to lodash.trottle.

<figure v-scroll-context="{ callback: scrollCallback, params: { multiplier: 0.05 }, throttle: 30 }">
    <img ... />
</figure>

Callback

The callback gets passed the element, the calculated context and the params you passed into the directive. The context consists of

• rect which is the result of getBoundingClientRect()
• amountRevealed which is the numbers of pixels the element is in view (only if it's in view or user scrolled past, otherwise returns 0)

You can use it to create a parallax effect, for example:

export default {
    name: 'Example',
    methods: {
        scrollCallback(el, ctx, params) {
            el.style.transform = `translateY(-${ctx.amountRevealed * params.multiplier}px)`;
        },
    },
};

License

MIT