@servicenow/ui-renderer-snabbdom/module/onDisconnect.js

Snabbdom renderer for UI Framework on Next Experience

/**
 * Copyright (c) 2020 ServiceNow, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *  
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *  
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
import { patch } from './utils';
import { VNODE } from './symbols';
/**
 * Patches an empty tree to a container so we run hooks and cleanup
 * @param {HTMLElement} element Element being disconnected
 * @param {Function} [dispatch] function contextualized to the element
 * @param {Function} [next] function to call after disconnect
 */

export default function onDisconnect(element, dispatch, next = () => null) {
  const prev = element[VNODE];
  const styles = [];
  const {
    children
  } = prev;
  const {
    length: childrenCount
  } = children;

  for (let i = 0; i < childrenCount; i++) {
    const child = children[i];
    if (child && typeof child.sel === 'string' && (child.sel.startsWith('style') || child.sel.startsWith('link'))) styles.push(child);
  }

  const nextEl = { ...prev,
    children: styles
  };
  patch(prev, nextEl, {
    disconnect: true
  });
  delete element[VNODE]; // eslint-disable-line no-param-reassign

  next();
}
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