@servicenow/ui-renderer-snabbdom/module/modules/props.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.
 */

// This is a modified version of the snabbdom props module. Unlike the upstream
// module, this implementation does set removed properties to `undefined`
const updateProps = (oldVnode, vnode) => {
  let {
    data: {
      props: oldProps
    }
  } = oldVnode;
  let {
    data: {
      props
    },
    // eslint-disable-next-line prefer-const
    elm
  } = vnode;
  if (!oldProps && !props) return;
  if (oldProps === props) return;
  oldProps = oldProps || {};
  props = props || {};

  for (const key in oldProps) {
    if (!props.hasOwnProperty(key)) elm[key] = key === 'className' ? '' : undefined;
  }

  for (const key in props) {
    const cur = props[key];
    const old = oldProps[key];
    if (old !== cur && (key !== 'value' || elm[key] !== cur)) elm[key] = cur;
  }
};

export default {
  create: updateProps,
  update: updateProps
};
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