klook-web-uikit/src/directives/transfer-dom.js

A Component Library for Vue.js

// Thanks to: https://github.com/airyland/vux/blob/v2/src/directives/transfer-dom/index.js
// Thanks to: https://github.com/calebroseland/vue-dom-portal

/**
 * Get target DOM Node
 * @param {(Node|string|Boolean)} [node=document.body] DOM Node, CSS selector, or Boolean
 * @return {Node} The target that the el will be appended to
 */
function getTarget(node) {
    if (node === void 0) {
        node = document.body;
    }
    if (node === true) {
        return document.body;
    }
    return node instanceof window.Node ? node : document.querySelector(node);
}

const directive = {
    inserted(el, {value}) {
        if (el.dataset && el.dataset.transfer !== 'true') return false;
        el.className = el.className ? el.className + ' v-transfer-dom' : 'v-transfer-dom';
        const parentNode = el.parentNode;
        if (!parentNode) return;
        const home = document.createComment('');
        let hasMovedOut = false;

        if (value !== false) {
            parentNode.replaceChild(home, el); // moving out, el is no longer in the document
            getTarget(value).appendChild(el); // moving into new place
            hasMovedOut = true;
        }
        if (!el.__transferDomData) {
            el.__transferDomData = {
                parentNode: parentNode,
                home: home,
                target: getTarget(value),
                hasMovedOut: hasMovedOut
            };
        }
    },
    componentUpdated(el, {value}) {
        if (el.dataset && el.dataset.transfer !== 'true') return false;
        // need to make sure children are done updating (vs. `update`)
        const ref$1 = el.__transferDomData;
        if (!ref$1) return;
        // homes.get(el)
        const parentNode = ref$1.parentNode;
        const home = ref$1.home;
        const hasMovedOut = ref$1.hasMovedOut; // recall where home is

        if (!hasMovedOut && value) {
            // remove from document and leave placeholder
            parentNode.replaceChild(home, el);
            // append to target
            getTarget(value).appendChild(el);
            el.__transferDomData = Object.assign({}, el.__transferDomData, {
                hasMovedOut: true,
                target: getTarget(value)
            });
        } else if (hasMovedOut && value === false) {
            // previously moved, coming back home
            parentNode.replaceChild(el, home);
            el.__transferDomData = Object.assign({}, el.__transferDomData, {
                hasMovedOut: false,
                target: getTarget(value)
            });
        } else if (value) {
            // already moved, going somewhere else
            getTarget(value).appendChild(el);
        }
    },
    unbind(el) {
        if (el.dataset && el.dataset.transfer !== 'true') return false;
        el.className = el.className.replace('v-transfer-dom', '');
        const ref$1 = el.__transferDomData;
        if (!ref$1) return;
        if (el.__transferDomData.hasMovedOut === true) {
            el.__transferDomData.parentNode && el.__transferDomData.parentNode.appendChild(el);
        }
        el.__transferDomData = null;
    }
};

export default directive;