@empathyco/x-components/js/composables/use-on-display.js

Empathy X Components

import { watch } from 'vue';
import { useElementVisibility } from '@vueuse/core';
import { useXBus } from './use-x-bus.js';

/**
 * Composable that triggers a callback whenever the provided element appears in the viewport.
 * It can trigger the first time only or every time the element appears in the viewport.
 *
 * @param options - The options to customize the behavior of the composable. The element that
 * will be watched, the callback to trigger and if the callback should be triggered only once
 * or every time the element appears in the viewport, true by default.
 *
 * @returns If the element is currently visible in the viewport or not and the watcher stop handle.
 *
 * @public
 */
function useOnDisplay({ element, callback, triggerOnce = true }) {
    const isElementVisible = useElementVisibility(element);
    const unwatchDisplay = watch(isElementVisible, newValue => {
        if (newValue) {
            callback();
            if (triggerOnce) {
                unwatchDisplay();
            }
        }
    });
    return {
        isElementVisible,
        unwatchDisplay
    };
}
/**
 * Composable that emits a `TrackableElementDisplayed` event whenever the provided element
 * appears in the viewport for the first time.
 *
 * @param options - The options to customize the behavior of the composable. The element that
 * will be watched and the tagging request to emit.
 *
 * @returns If the element is currently visible in the viewport or not and the watcher stop handle.
 *
 * @public
 */
function useEmitDisplayEvent({ element, taggingRequest, eventMetadata = {} }) {
    const bus = useXBus();
    const { isElementVisible, unwatchDisplay } = useOnDisplay({
        element,
        callback: () => {
            bus.emit('TrackableElementDisplayed', { tagging: { display: taggingRequest } }, eventMetadata);
        }
    });
    return {
        isElementVisible,
        unwatchDisplay
    };
}

export { useEmitDisplayEvent, useOnDisplay };
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