ReactDOMInput.js

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

// TODO: direct imports like some-package/src/* are bad. Fix me.
import {getCurrentFiberOwnerNameInDevOrNull} from 'react-reconciler/src/ReactCurrentFiber';
import invariant from 'shared/invariant';

import {setValueForProperty} from './DOMPropertyOperations';
import {getFiberCurrentPropsFromNode} from './ReactDOMComponentTree';
import {getToStringValue, toString} from './ToStringValue';
import {checkControlledValueProps} from '../shared/ReactControlledValuePropTypes';
import {updateValueIfChanged} from './inputValueTracking';
import {disableInputAttributeSyncing} from 'shared/ReactFeatureFlags';

import type {ToStringValue} from './ToStringValue';

type InputWithWrapperState = HTMLInputElement & {
  _wrapperState: {
    initialValue: ToStringValue,
    initialChecked: ?boolean,
    controlled?: boolean,
    ...
  },
  ...
};

let didWarnValueDefaultValue = false;
let didWarnCheckedDefaultChecked = false;
let didWarnControlledToUncontrolled = false;
let didWarnUncontrolledToControlled = false;

function isControlled(props) {
  const usesChecked = props.type === 'checkbox' || props.type === 'radio';
  return usesChecked ? props.checked != null : props.value != null;
}

/**
 * Implements an <input> host component that allows setting these optional
 * props: `checked`, `value`, `defaultChecked`, and `defaultValue`.
 *
 * If `checked` or `value` are not supplied (or null/undefined), user actions
 * that affect the checked state or value will trigger updates to the element.
 *
 * If they are supplied (and not null/undefined), the rendered element will not
 * trigger updates to the element. Instead, the props must change in order for
 * the rendered element to be updated.
 *
 * The rendered element will be initialized as unchecked (or `defaultChecked`)
 * with an empty value (or `defaultValue`).
 *
 * See http://www.w3.org/TR/2012/WD-html5-20121025/the-input-element.html
 */

export function getHostProps(element: Element, props: Object) {
  const node = ((element: any): InputWithWrapperState);
  const checked = props.checked;

  const hostProps = Object.assign({}, props, {
    defaultChecked: undefined,
    defaultValue: undefined,
    value: undefined,
    checked: checked != null ? checked : node._wrapperState.initialChecked,
  });

  return hostProps;
}

export function initWrapperState(element: Element, props: Object) {
  if (__DEV__) {
    checkControlledValueProps('input', props);

    if (
      props.checked !== undefined &&
      props.defaultChecked !== undefined &&
      !didWarnCheckedDefaultChecked
    ) {
      console.error(
        '%s contains an input of type %s with both checked and defaultChecked props. ' +
          'Input elements must be either controlled or uncontrolled ' +
          '(specify either the checked prop, or the defaultChecked prop, but not ' +
          'both). Decide between using a controlled or uncontrolled input ' +
          'element and remove one of these props. More info: ' +
          'https://fb.me/react-controlled-components',
        getCurrentFiberOwnerNameInDevOrNull() || 'A component',
        props.type,
      );
      didWarnCheckedDefaultChecked = true;
    }
    if (
      props.value !== undefined &&
      props.defaultValue !== undefined &&
      !didWarnValueDefaultValue
    ) {
      console.error(
        '%s contains an input of type %s with both value and defaultValue props. ' +
          'Input elements must be either controlled or uncontrolled ' +
          '(specify either the value prop, or the defaultValue prop, but not ' +
          'both). Decide between using a controlled or uncontrolled input ' +
          'element and remove one of these props. More info: ' +
          'https://fb.me/react-controlled-components',
        getCurrentFiberOwnerNameInDevOrNull() || 'A component',
        props.type,
      );
      didWarnValueDefaultValue = true;
    }
  }

  const node = ((element: any): InputWithWrapperState);
  const defaultValue = props.defaultValue == null ? '' : props.defaultValue;

  node._wrapperState = {
    initialChecked:
      props.checked != null ? props.checked : props.defaultChecked,
    initialValue: getToStringValue(
      props.value != null ? props.value : defaultValue,
    ),
    controlled: isControlled(props),
  };
}

export function updateChecked(element: Element, props: Object) {
  const node = ((element: any): InputWithWrapperState);
  const checked = props.checked;
  if (checked != null) {
    setValueForProperty(node, 'checked', checked, false);
  }
}

export function updateWrapper(element: Element, props: Object) {
  const node = ((element: any): InputWithWrapperState);
  if (__DEV__) {
    const controlled = isControlled(props);

    if (
      !node._wrapperState.controlled &&
      controlled &&
      !didWarnUncontrolledToControlled
    ) {
      console.error(
        'A component is changing an uncontrolled input to be controlled. ' +
          'This is likely caused by the value changing from undefined to ' +
          'a defined value, which should not happen. ' +
          'Decide between using a controlled or uncontrolled input ' +
          'element for the lifetime of the component. More info: https://fb.me/react-controlled-components',
      );
      didWarnUncontrolledToControlled = true;
    }
    if (
      node._wrapperState.controlled &&
      !controlled &&
      !didWarnControlledToUncontrolled
    ) {
      console.error(
        'A component is changing a controlled input to be uncontrolled. ' +
          'This is likely caused by the value changing from a defined to ' +
          'undefined, which should not happen. ' +
          'Decide between using a controlled or uncontrolled input ' +
          'element for the lifetime of the component. More info: https://fb.me/react-controlled-components',
      );
      didWarnControlledToUncontrolled = true;
    }
  }

  updateChecked(element, props);

  const value = getToStringValue(props.value);
  const type = props.type;

  if (value != null) {
    if (type === 'number') {
      if (
        (value === 0 && node.value === '') ||
        // We explicitly want to coerce to number here if possible.
        // eslint-disable-next-line
        node.value != (value: any)
      ) {
        node.value = toString((value: any));
      }
    } else if (node.value !== toString((value: any))) {
      node.value = toString((value: any));
    }
  } else if (type === 'submit' || type === 'reset') {
    // Submit/reset inputs need the attribute removed completely to avoid
    // blank-text buttons.
    node.removeAttribute('value');
    return;
  }

  if (disableInputAttributeSyncing) {
    // When not syncing the value attribute, React only assigns a new value
    // whenever the defaultValue React prop has changed. When not present,
    // React does nothing
    if (props.hasOwnProperty('defaultValue')) {
      setDefaultValue(node, props.type, getToStringValue(props.defaultValue));
    }
  } else {
    // When syncing the value attribute, the value comes from a cascade of
    // properties:
    //  1. The value React property
    //  2. The defaultValue React property
    //  3. Otherwise there should be no change
    if (props.hasOwnProperty('value')) {
      setDefaultValue(node, props.type, value);
    } else if (props.hasOwnProperty('defaultValue')) {
      setDefaultValue(node, props.type, getToStringValue(props.defaultValue));
    }
  }

  if (disableInputAttributeSyncing) {
    // When not syncing the checked attribute, the attribute is directly
    // controllable from the defaultValue React property. It needs to be
    // updated as new props come in.
    if (props.defaultChecked == null) {
      node.removeAttribute('checked');
    } else {
      node.defaultChecked = !!props.defaultChecked;
    }
  } else {
    // When syncing the checked attribute, it only changes when it needs
    // to be removed, such as transitioning from a checkbox into a text input
    if (props.checked == null && props.defaultChecked != null) {
      node.defaultChecked = !!props.defaultChecked;
    }
  }
}

export function postMountWrapper(
  element: Element,
  props: Object,
  isHydrating: boolean,
) {
  const node = ((element: any): InputWithWrapperState);

  // Do not assign value if it is already set. This prevents user text input
  // from being lost during SSR hydration.
  if (props.hasOwnProperty('value') || props.hasOwnProperty('defaultValue')) {
    const type = props.type;
    const isButton = type === 'submit' || type === 'reset';

    // Avoid setting value attribute on submit/reset inputs as it overrides the
    // default value provided by the browser. See: #12872
    if (isButton && (props.value === undefined || props.value === null)) {
      return;
    }

    const initialValue = toString(node._wrapperState.initialValue);

    // Do not assign value if it is already set. This prevents user text input
    // from being lost during SSR hydration.
    if (!isHydrating) {
      if (disableInputAttributeSyncing) {
        const value = getToStringValue(props.value);

        // When not syncing the value attribute, the value property points
        // directly to the React prop. Only assign it if it exists.
        if (value != null) {
          // Always assign on buttons so that it is possible to assign an
          // empty string to clear button text.
          //
          // Otherwise, do not re-assign the value property if is empty. This
          // potentially avoids a DOM write and prevents Firefox (~60.0.1) from
          // prematurely marking required inputs as invalid. Equality is compared
          // to the current value in case the browser provided value is not an
          // empty string.
          if (isButton || value !== node.value) {
            node.value = toString(value);
          }
        }
      } else {
        // When syncing the value attribute, the value property should use
        // the wrapperState._initialValue property. This uses:
        //
        //   1. The value React property when present
        //   2. The defaultValue React property when present
        //   3. An empty string
        if (initialValue !== node.value) {
          node.value = initialValue;
        }
      }
    }

    if (disableInputAttributeSyncing) {
      // When not syncing the value attribute, assign the value attribute
      // directly from the defaultValue React property (when present)
      const defaultValue = getToStringValue(props.defaultValue);
      if (defaultValue != null) {
        node.defaultValue = toString(defaultValue);
      }
    } else {
      // Otherwise, the value attribute is synchronized to the property,
      // so we assign defaultValue to the same thing as the value property
      // assignment step above.
      node.defaultValue = initialValue;
    }
  }

  // Normally, we'd just do `node.checked = node.checked` upon initial mount, less this bug
  // this is needed to work around a chrome bug where setting defaultChecked
  // will sometimes influence the value of checked (even after detachment).
  // Reference: https://bugs.chromium.org/p/chromium/issues/detail?id=608416
  // We need to temporarily unset name to avoid disrupting radio button groups.
  const name = node.name;
  if (name !== '') {
    node.name = '';
  }

  if (disableInputAttributeSyncing) {
    // When not syncing the checked attribute, the checked property
    // never gets assigned. It must be manually set. We don't want
    // to do this when hydrating so that existing user input isn't
    // modified
    if (!isHydrating) {
      updateChecked(element, props);
    }

    // Only assign the checked attribute if it is defined. This saves
    // a DOM write when controlling the checked attribute isn't needed
    // (text inputs, submit/reset)
    if (props.hasOwnProperty('defaultChecked')) {
      node.defaultChecked = !node.defaultChecked;
      node.defaultChecked = !!props.defaultChecked;
    }
  } else {
    // When syncing the checked attribute, both the checked property and
    // attribute are assigned at the same time using defaultChecked. This uses:
    //
    //   1. The checked React property when present
    //   2. The defaultChecked React property when present
    //   3. Otherwise, false
    node.defaultChecked = !node.defaultChecked;
    node.defaultChecked = !!node._wrapperState.initialChecked;
  }

  if (name !== '') {
    node.name = name;
  }
}

export function restoreControlledState(element: Element, props: Object) {
  const node = ((element: any): InputWithWrapperState);
  updateWrapper(node, props);
  updateNamedCousins(node, props);
}

function updateNamedCousins(rootNode, props) {
  const name = props.name;
  if (props.type === 'radio' && name != null) {
    let queryRoot: Element = rootNode;

    while (queryRoot.parentNode) {
      queryRoot = ((queryRoot.parentNode: any): Element);
    }

    // If `rootNode.form` was non-null, then we could try `form.elements`,
    // but that sometimes behaves strangely in IE8. We could also try using
    // `form.getElementsByName`, but that will only return direct children
    // and won't include inputs that use the HTML5 `form=` attribute. Since
    // the input might not even be in a form. It might not even be in the
    // document. Let's just use the local `querySelectorAll` to ensure we don't
    // miss anything.
    const group = queryRoot.querySelectorAll(
      'input[name=' + JSON.stringify('' + name) + '][type="radio"]',
    );

    for (let i = 0; i < group.length; i++) {
      const otherNode = ((group[i]: any): HTMLInputElement);
      if (otherNode === rootNode || otherNode.form !== rootNode.form) {
        continue;
      }
      // This will throw if radio buttons rendered by different copies of React
      // and the same name are rendered into the same form (same as #1939).
      // That's probably okay; we don't support it just as we don't support
      // mixing React radio buttons with non-React ones.
      const otherProps = getFiberCurrentPropsFromNode(otherNode);
      invariant(
        otherProps,
        'ReactDOMInput: Mixing React and non-React radio inputs with the ' +
          'same `name` is not supported.',
      );

      // We need update the tracked value on the named cousin since the value
      // was changed but the input saw no event or value set
      updateValueIfChanged(otherNode);

      // If this is a controlled radio button group, forcing the input that
      // was previously checked to update will cause it to be come re-checked
      // as appropriate.
      updateWrapper(otherNode, otherProps);
    }
  }
}

// In Chrome, assigning defaultValue to certain input types triggers input validation.
// For number inputs, the display value loses trailing decimal points. For email inputs,
// Chrome raises "The specified value <x> is not a valid email address".
//
// Here we check to see if the defaultValue has actually changed, avoiding these problems
// when the user is inputting text
//
// https://github.com/facebook/react/issues/7253
export function setDefaultValue(
  node: InputWithWrapperState,
  type: ?string,
  value: *,
) {
  if (
    // Focused number inputs synchronize on blur. See ChangeEventPlugin.js
    type !== 'number' ||
    node.ownerDocument.activeElement !== node
  ) {
    if (value == null) {
      node.defaultValue = toString(node._wrapperState.initialValue);
    } else if (node.defaultValue !== toString(value)) {
      node.defaultValue = toString(value);
    }
  }
}