Question

我完全是新的反应，我在ES5做我的项目。我需要使用React Autosuggest模块，但它是ES6中的示例。

任何人都可以将其翻译为ES5

function states () {
  return [
    {abbr: 'AL', name: 'Alabama'},
    {abbr: 'AK', name: 'Alaska'},
    {abbr: 'AZ', name: 'Arizona'},
    {abbr: 'AR', name: 'Arkansas'},
  ]
}

class AutocompleteExample extends React.Component {
  constructor () {
    super()
    this.state = {tags: []}
  }

  handleChange (tags) {
    this.setState({tags})
  }

  render () {
    function autocompleteRenderInput ({addTag, ...props}) {
      const handleOnChange = (e, {newValue, method}) => {
        if (method === 'enter') {
          e.preventDefault()
        } else {
          props.onChange(e)
        }
      }

      const inputValue = (props.value && props.value.trim().toLowerCase()) || ''
      const inputLength = inputValue.length

      let suggestions = states().filter((state) => {
        return state.name.toLowerCase().slice(0, inputLength) === inputValue
      })

      return (
        <Autosuggest
          ref={props.ref}
          suggestions={suggestions}
          shouldRenderSuggestions={(value) => value && value.trim().length > 0}
          getSuggestionValue={(suggestion) => suggestion.name}
          renderSuggestion={(suggestion) => <span>{suggestion.name}</span>}
          inputProps={{...props, onChange: handleOnChange}}
          onSuggestionSelected={(e, {suggestion}) => {
            addTag(suggestion.name)
          }}
          onSuggestionsClearRequested={() => {}}
          onSuggestionsFetchRequested={() => {}}
        />
      )
    }

    return <TagsInput renderInput={autocompleteRenderInput} value={this.state.tags} onChange={::this.handleChange} />
  }
}

Answer 1

您可以使用babel来转换代码。您可以使用babel repl执行此操作。这是代码的转换版本

'use strict';

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _objectWithoutProperties(obj, keys) { var target = {}; for (var i in obj) { if (keys.indexOf(i) >= 0) continue; if (!Object.prototype.hasOwnProperty.call(obj, i)) continue; target[i] = obj[i]; } return target; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

function states() {
  return [{ abbr: 'AL', name: 'Alabama' }, { abbr: 'AK', name: 'Alaska' }, { abbr: 'AZ', name: 'Arizona' }, { abbr: 'AR', name: 'Arkansas' }];
}

var AutocompleteExample = function (_React$Component) {
  _inherits(AutocompleteExample, _React$Component);

  function AutocompleteExample() {
    _classCallCheck(this, AutocompleteExample);

    var _this = _possibleConstructorReturn(this, (AutocompleteExample.__proto__ || Object.getPrototypeOf(AutocompleteExample)).call(this));

    _this.state = { tags: [] };
    return _this;
  }

  _createClass(AutocompleteExample, [{
    key: 'handleChange',
    value: function handleChange(tags) {
      this.setState({ tags: tags });
    }
  }, {
    key: 'render',
    value: function render() {
      function autocompleteRenderInput(_ref) {
        var addTag = _ref.addTag,
            props = _objectWithoutProperties(_ref, ['addTag']);

        var handleOnChange = function handleOnChange(e, _ref2) {
          var newValue = _ref2.newValue,
              method = _ref2.method;

          if (method === 'enter') {
            e.preventDefault();
          } else {
            props.onChange(e);
          }
        };

        var inputValue = props.value && props.value.trim().toLowerCase() || '';
        var inputLength = inputValue.length;

        var suggestions = states().filter(function (state) {
          return state.name.toLowerCase().slice(0, inputLength) === inputValue;
        });

        return React.createElement(Autosuggest, {
          ref: props.ref,
          suggestions: suggestions,
          shouldRenderSuggestions: function shouldRenderSuggestions(value) {
            return value && value.trim().length > 0;
          },
          getSuggestionValue: function getSuggestionValue(suggestion) {
            return suggestion.name;
          },
          renderSuggestion: function renderSuggestion(suggestion) {
            return React.createElement(
              'span',
              null,
              suggestion.name
            );
          },
          inputProps: _extends({}, props, { onChange: handleOnChange }),
          onSuggestionSelected: function onSuggestionSelected(e, _ref3) {
            var suggestion = _ref3.suggestion;

            addTag(suggestion.name);
          },
          onSuggestionsClearRequested: function onSuggestionsClearRequested() {},
          onSuggestionsFetchRequested: function onSuggestionsFetchRequested() {}
        });
      }

      return React.createElement(TagsInput, { renderInput: autocompleteRenderInput, value: this.state.tags, onChange: this.handleChange });
    }
  }]);

  return AutocompleteExample;
}(React.Component);

Answer 2

没有将React组件直接转换为ES5。在ES6之前的反应有自己的React.createClass语法和其他类似的东西。

它具有欺骗性，因为它使用ES6 class语法，但React有自己独特的处理方式。所有的魔法都在extends Component内。你感到困惑的一切可能都是.jsx和render之类的东西（它是一个React的东西）。

Babel将React组件转换成您永远不会写的东西。这不是你想要的（我认为）。如果类语法让你感到困惑。独立学习，然后在React的背景下处理ES6。

React-Autosuggest和ES5

2 个答案: