@material-ui/core/es/Select/SelectInput.js

React components that implement Google's Material Design.

import _extends from "@babel/runtime/helpers/esm/extends";
import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
import React from 'react';
import PropTypes from 'prop-types';
import clsx from 'clsx';
import warning from 'warning';
import Menu from '../Menu/Menu';
import { isFilled } from '../InputBase/utils';
import { useForkRef } from '../utils/reactHelpers';

function areEqualValues(a, b) {
  if (typeof b === 'object' && b !== null) {
    return a === b;
  }

  return String(a) === String(b);
}

function isEmpty(display) {
  return display == null || typeof display === 'string' && !display.trim();
}
/**
 * @ignore - internal component.
 */


const SelectInput = React.forwardRef(function SelectInput(props, ref) {
  const {
    autoFocus,
    autoWidth,
    children,
    classes,
    className,
    disabled,
    displayEmpty,
    IconComponent,
    inputRef: inputRefProp,
    MenuProps = {},
    multiple,
    name,
    onBlur,
    onChange,
    onClose,
    onFocus,
    onOpen,
    open: openProp,
    readOnly,
    renderValue,
    SelectDisplayProps,
    tabIndex: tabIndexProp,
    type = 'hidden',
    value,
    variant
  } = props,
        other = _objectWithoutPropertiesLoose(props, ["autoFocus", "autoWidth", "children", "classes", "className", "disabled", "displayEmpty", "IconComponent", "inputRef", "MenuProps", "multiple", "name", "onBlur", "onChange", "onClose", "onFocus", "onOpen", "open", "readOnly", "renderValue", "required", "SelectDisplayProps", "tabIndex", "type", "value", "variant"]);

  const inputRef = React.useRef(null);
  const displayRef = React.useRef(null);
  const ignoreNextBlur = React.useRef(false);
  const {
    current: isOpenControlled
  } = React.useRef(openProp != null);
  const [menuMinWidthState, setMenuMinWidthState] = React.useState();
  const [openState, setOpenState] = React.useState(false);
  const [, forceUpdate] = React.useState(0);
  const handleRef = useForkRef(ref, inputRefProp);
  React.useImperativeHandle(handleRef, () => ({
    focus: () => {
      displayRef.current.focus();
    },
    node: inputRef.current,
    value
  }), [value]);
  React.useEffect(() => {
    if (isOpenControlled && openProp) {
      // Focus the display node so the focus is restored on this element once
      // the menu is closed.
      displayRef.current.focus(); // Rerender with the resolve `displayRef` reference.

      forceUpdate(n => !n);
    }

    if (autoFocus) {
      displayRef.current.focus();
    }
  }, [autoFocus, isOpenControlled, openProp]);

  const update = (open, event) => {
    if (open) {
      if (onOpen) {
        onOpen(event);
      }
    } else if (onClose) {
      onClose(event);
    }

    if (!isOpenControlled) {
      setMenuMinWidthState(autoWidth ? null : displayRef.current.clientWidth);
      setOpenState(open);
    }
  };

  const handleClick = event => {
    // Opening the menu is going to blur the. It will be focused back when closed.
    ignoreNextBlur.current = true;
    update(true, event);
  };

  const handleClose = event => {
    update(false, event);
  };

  const handleItemClick = child => event => {
    if (!multiple) {
      update(false, event);
    }

    if (onChange) {
      let newValue;

      if (multiple) {
        newValue = Array.isArray(value) ? [...value] : [];
        const itemIndex = value.indexOf(child.props.value);

        if (itemIndex === -1) {
          newValue.push(child.props.value);
        } else {
          newValue.splice(itemIndex, 1);
        }
      } else {
        newValue = child.props.value;
      }

      event.persist();
      event.target = {
        value: newValue,
        name
      };
      onChange(event, child);
    }
  };

  const handleBlur = event => {
    if (ignoreNextBlur.current === true) {
      // The parent components are relying on the bubbling of the event.
      event.stopPropagation();
      ignoreNextBlur.current = false;
      return;
    }

    if (onBlur) {
      event.persist();
      event.target = {
        value,
        name
      };
      onBlur(event);
    }
  };

  const handleKeyDown = event => {
    if (!readOnly) {
      const validKeys = [' ', 'ArrowUp', 'ArrowDown', // The native select doesn't respond to enter on MacOS, but it's recommended by
      // https://www.w3.org/TR/wai-aria-practices/examples/listbox/listbox-collapsible.html
      'Enter'];

      if (validKeys.indexOf(event.key) !== -1) {
        event.preventDefault(); // Opening the menu is going to blur the. It will be focused back when closed.

        ignoreNextBlur.current = true;
        update(true, event);
      }
    }
  };

  const open = isOpenControlled && displayRef.current ? openProp : openState;
  delete other['aria-invalid'];
  let display;
  let displaySingle;
  const displayMultiple = [];
  let computeDisplay = false; // No need to display any value if the field is empty.

  if (isFilled(props) || displayEmpty) {
    if (renderValue) {
      display = renderValue(value);
    } else {
      computeDisplay = true;
    }
  }

  const items = React.Children.map(children, child => {
    if (!React.isValidElement(child)) {
      return null;
    }

    process.env.NODE_ENV !== "production" ? warning(child.type !== React.Fragment, ["Material-UI: the Select component doesn't accept a Fragment as a child.", 'Consider providing an array instead.'].join('\n')) : void 0;
    let selected;

    if (multiple) {
      if (!Array.isArray(value)) {
        throw new Error('Material-UI: the `value` prop must be an array ' + 'when using the `Select` component with `multiple`.');
      }

      selected = value.some(v => areEqualValues(v, child.props.value));

      if (selected && computeDisplay) {
        displayMultiple.push(child.props.children);
      }
    } else {
      selected = areEqualValues(value, child.props.value);

      if (selected && computeDisplay) {
        displaySingle = child.props.children;
      }
    }

    return React.cloneElement(child, {
      'aria-selected': selected ? 'true' : undefined,
      onClick: handleItemClick(child),
      role: 'option',
      selected,
      value: undefined,
      // The value is most likely not a valid HTML attribute.
      'data-value': child.props.value // Instead, we provide it as a data attribute.

    });
  });

  if (computeDisplay) {
    display = multiple ? displayMultiple.join(', ') : displaySingle;
  } // Avoid performing a layout computation in the render method.


  let menuMinWidth = menuMinWidthState;

  if (!autoWidth && isOpenControlled && displayRef.current) {
    menuMinWidth = displayRef.current.clientWidth;
  }

  let tabIndex;

  if (typeof tabIndexProp !== 'undefined') {
    tabIndex = tabIndexProp;
  } else {
    tabIndex = disabled ? null : 0;
  }

  return React.createElement(React.Fragment, null, React.createElement("div", _extends({
    className: clsx(classes.root, // TODO v5: merge root and select
    classes.select, classes.selectMenu, className, disabled && classes.disabled, {
      filled: classes.filled,
      outlined: classes.outlined
    }[variant]),
    ref: displayRef,
    tabIndex: tabIndex,
    role: "button",
    "aria-expanded": open ? 'true' : undefined,
    "aria-haspopup": "listbox",
    "aria-owns": open ? `menu-${name || ''}` : undefined,
    onKeyDown: handleKeyDown,
    onBlur: handleBlur,
    onClick: disabled || readOnly ? null : handleClick,
    onFocus: onFocus // The id can help with end-to-end testing automation.
    ,
    id: name ? `select-${name}` : undefined
  }, SelectDisplayProps), isEmpty(display) ? // eslint-disable-next-line react/no-danger
  React.createElement("span", {
    dangerouslySetInnerHTML: {
      __html: '​'
    }
  }) : display), React.createElement("input", _extends({
    value: Array.isArray(value) ? value.join(',') : value,
    name: name,
    ref: inputRef,
    type: type,
    autoFocus: autoFocus
  }, other)), React.createElement(IconComponent, {
    className: classes.icon
  }), React.createElement(Menu, _extends({
    id: `menu-${name || ''}`,
    anchorEl: displayRef.current,
    open: open,
    onClose: handleClose
  }, MenuProps, {
    MenuListProps: _extends({
      role: 'listbox',
      disableListWrap: true
    }, MenuProps.MenuListProps),
    PaperProps: _extends({}, MenuProps.PaperProps, {
      style: _extends({
        minWidth: menuMinWidth
      }, MenuProps.PaperProps != null ? MenuProps.PaperProps.style : null)
    })
  }), items));
});
process.env.NODE_ENV !== "production" ? SelectInput.propTypes = {
  /**
   * @ignore
   */
  autoFocus: PropTypes.bool,

  /**
   * If true, the width of the popover will automatically be set according to the items inside the
   * menu, otherwise it will be at least the width of the select input.
   */
  autoWidth: PropTypes.bool,

  /**
   * The option elements to populate the select with.
   * Can be some `<MenuItem>` elements.
   */
  children: PropTypes.node,

  /**
   * Override or extend the styles applied to the component.
   * See [CSS API](#css) below for more details.
   */
  classes: PropTypes.object.isRequired,

  /**
   * The CSS class name of the select element.
   */
  className: PropTypes.string,

  /**
   * If `true`, the select will be disabled.
   */
  disabled: PropTypes.bool,

  /**
   * If `true`, the selected item is displayed even if its value is empty.
   */
  displayEmpty: PropTypes.bool,

  /**
   * The icon that displays the arrow.
   */
  IconComponent: PropTypes.elementType,

  /**
   * Use that prop to pass a ref callback to the native select element.
   */
  inputRef: PropTypes.oneOfType([PropTypes.func, PropTypes.object]),

  /**
   * Props applied to the [`Menu`](/api/menu/) element.
   */
  MenuProps: PropTypes.object,

  /**
   * If true, `value` must be an array and the menu will support multiple selections.
   */
  multiple: PropTypes.bool,

  /**
   * Name attribute of the `select` or hidden `input` element.
   */
  name: PropTypes.string,

  /**
   * @ignore
   */
  onBlur: PropTypes.func,

  /**
   * Callback function fired when a menu item is selected.
   *
   * @param {object} event The event source of the callback.
   * You can pull out the new value by accessing `event.target.value`.
   * @param {object} [child] The react element that was selected.
   */
  onChange: PropTypes.func,

  /**
   * Callback fired when the component requests to be closed.
   * Use in controlled mode (see open).
   *
   * @param {object} event The event source of the callback
   */
  onClose: PropTypes.func,

  /**
   * @ignore
   */
  onFocus: PropTypes.func,

  /**
   * Callback fired when the component requests to be opened.
   * Use in controlled mode (see open).
   *
   * @param {object} event The event source of the callback
   */
  onOpen: PropTypes.func,

  /**
   * Control `select` open state.
   */
  open: PropTypes.bool,

  /**
   * @ignore
   */
  readOnly: PropTypes.bool,

  /**
   * Render the selected value.
   *
   * @param {*} value The `value` provided to the component.
   * @returns {ReactElement}
   */
  renderValue: PropTypes.func,

  /**
   * @ignore
   */
  required: PropTypes.bool,

  /**
   * Props applied to the clickable div element.
   */
  SelectDisplayProps: PropTypes.object,

  /**
   * @ignore
   */
  tabIndex: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),

  /**
   * @ignore
   */
  type: PropTypes.string,

  /**
   * The input value.
   */
  value: PropTypes.any.isRequired,

  /**
   * The variant to use.
   */
  variant: PropTypes.oneOf(['standard', 'outlined', 'filled'])
} : void 0;
export default SelectInput;