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/**
* Input/Textarea Autofocus Directive for Vue
*/
export default {
/**
* Set focus when element is rendered, but
* is not visible, using IntersectionObserver
*
* @param {Element} el Target element
*/
inserted(el) {
if ('IntersectionObserver' in window) {
// Element visibility is dynamic, so we attach observer
el.visibilityObserver = new IntersectionObserver(entries => {
entries.forEach(entry => {
// Combining `intersectionRatio > 0` and
// element's `offsetParent` presence will
// deteremine if element is truely visible
if (entry.intersectionRatio > 0 && entry.target.offsetParent) {
entry.target.focus();
}
});
});
// Bind the observer.
el.visibilityObserver.observe(el, { root: document.documentElement });
}
},
/**
* Detach observer on unbind hook.
*
* @param {Element} el Target element
*/
unbind(el) {
if (el.visibilityObserver) {
el.visibilityObserver.disconnect();
}
},
};
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