inputValueTracking.js — react Source File

Source Code

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */

import {checkFormFieldValueStringCoercion} from 'shared/CheckStringCoercion';

type ValueTracker = {
  getValue(): string,
  setValue(value: string): void,
  stopTracking(): void,
};
interface ElementWithValueTracker extends HTMLInputElement {
  _valueTracker?: ?ValueTracker;
}

function isCheckable(elem: HTMLInputElement) {
  const type = elem.type;
  const nodeName = elem.nodeName;
  return (
    nodeName &&
    nodeName.toLowerCase() === 'input' &&
    (type === 'checkbox' || type === 'radio')
  );
}

function getTracker(node: ElementWithValueTracker) {
  return node._valueTracker;
}

function detachTracker(node: ElementWithValueTracker) {
  node._valueTracker = null;
}

function getValueFromNode(node: HTMLInputElement): string {
  let value = '';
  if (!node) {
    return value;
  }

  if (isCheckable(node)) {
    value = node.checked ? 'true' : 'false';
  } else {
    value = node.value;
  }

  return value;
}

function trackValueOnNode(
  node: any,
  valueField: 'checked' | 'value',
  currentValue: string,
): ?ValueTracker {
  const descriptor = Object.getOwnPropertyDescriptor(
    node.constructor.prototype,
// ... (129 more lines)