组件内不使用JSX,作为模块加载时可以节省代码量。
Input组件:
用于创建input、textarea元素,input、textarea元素两侧可添加额外的元素。
使用
var props={ type,// 类型"input|textarea" id, prefixCls,// 样式类前缀 size,// 尺寸"large|small|default" disabled, classname,// 输入框样式 placeholder, value, defaultValue,// 默认值,不随输入框内容变动 addonBefore,// 输入框前添加的元素 addonAfter,// 输入框后添加的元素 }; <Input {...props} />
源码
antd-input.js
'use strict'; // 浅拷贝 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; }; // _createClass(Constructor,protoProps,staticProps) 创建构造函数,定义静态方法、原型属性和方法 // protoProps用以定义Constructor.prototype 各属性、方法的访问器属性 // staticProps用以定义Constructor 各属性、方法的访问器属性,[{key,enumerable,configurable,value}]形式 var _createClass = (function () {// 利用自执行匿名函数优化defineProperties书写 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; }; })(); // 类型判断,包括symbol类型 var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol ? "symbol" : typeof obj; }; var _react = require('react'); var _react2 = _interopRequireDefault(_react); var _objectAssign = require('object-assign'); var _objectAssign2 = _interopRequireDefault(_objectAssign); // classnames函数参数为字符串或数值时,拼接样式并返回;为对象时,拼接键并返回 // 为数组时,根据数组元素项的不同获取样式 var _classnames = require('classnames'); var _classnames2 = _interopRequireDefault(_classnames); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; } // 构造函数只能使用new关键字调用 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } } function _possibleConstructorReturn(self, call) { // 构造函数未曾实例化,ReferenceError引用错误 Uncaught ReferenceError:XXXX is not defined 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; } // 继承,设置subClass.prototype为{constuctor:subClass},{constuctor:subClass}的原型是superClass.prototype // subClass.__proto__为superClass 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); } // 实例可访问原型属性或方法,构造函数不能 // Object.create创建对象,首参为该对象的原型prototype,次参为对象的自有属性,并设置属性描述符 subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); // Object.setPrototypeOf(subClass, superClass),设置subClass.__proto__为superClass // Object.getPrototypeOf(subClass),获取subClass.__proto__ // 构造函数可访问,实例不能 if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; } function ieGT9() { if ((typeof document === 'undefined' ? 'undefined' : _typeof(document)) === undefined) { return false; } var documentMode = document.documentMode || 0; return documentMode > 9; } // 将undefined或null调整为空字符串 function fixControlledValue(value) { if (typeof value === 'undefined' || value === null) { return ''; } return value; } // form-group组件,props.className|style|children有效 // 作为容器组件,props.children作为UI组件,在span下渲染该UI组件;机理类似react-route中Router // JSX使用:<Group className="" style={{}}><Children/></Group> // // ****************** 关于props.children的理解,通过JSX语法传入props.children ****************** // ****************** 需要在包裹的父组件中将props.children转化为reactElement方有效 ****************** var Group = function (_React$Component) { _inherits(Group, _React$Component); function Group() { _classCallCheck(this, Group); // 构造函数返回值不影响new关键字获取实例 return _possibleConstructorReturn(this, Object.getPrototypeOf(Group).apply(this, arguments)); } // 创建Group.prototype.render方法 _createClass(Group, [{ key: 'render', value: function render() { // _defineProperty函数执行后获得{'ant-input-group',[props.className]} // classnames函数参数为字符串或数值时,拼接样式并返回;为对象时,拼接键并返回 // 为数组时,根据数组元素项的不同获取样式 var className = (0, _classnames2.default)(_defineProperty({ 'ant-input-group': true }, this.props.className, !!this.props.className)); return _react2.default.createElement( 'span', { className: className, style: this.props.style }, this.props.children ); } }]); return Group; }(_react2.default.Component); Group.propTypes = { children: _react2.default.PropTypes.any }; // props:{ // type,// 类型"input|textarea" // id, // prefixCls,// 样式类前缀 // size,// 尺寸"large|small|default" // disabled, // classname,// 输入框样式 // placeholder, // value, // defaultValue,// 默认值,不随输入框内容变动 // addonBefore,// 输入框前添加的元素 // addonAfter,// 输入框后添加的元素 // } // JSX使用<Input prefixCls="" size="" ... /> var Input = function (_React$Component2) { _inherits(Input, _React$Component2); function Input() { _classCallCheck(this, Input); return _possibleConstructorReturn(this, Object.getPrototypeOf(Input).apply(this, arguments)); } // 添加原型方法 // renderInput方法用于生成input、textarea元素children // 生成的元素再通过renderLabledInput(children)方法用span、addonBefore、addonAfter包裹 // renderLabledInput方法返回的reactElement元素作为render方法的输出,用于渲染 _createClass(Input, [{ key: 'renderLabledInput', value: function renderLabledInput(children) { var _classNames2; var props = this.props; var wrapperClassName = props.prefixCls + '-group'; var addonClassName = wrapperClassName + '-addon'; var addonBefore = props.addonBefore ? _react2.default.createElement( 'span', { className: addonClassName }, props.addonBefore ) : null; var addonAfter = props.addonAfter ? _react2.default.createElement( 'span', { className: addonClassName }, props.addonAfter ) : null; var className = (0, _classnames2.default)((_classNames2 = {}, _defineProperty(_classNames2, props.prefixCls + '-wrapper', true), _defineProperty(_classNames2, wrapperClassName, addonBefore || addonAfter), _classNames2) ); return _react2.default.createElement( 'span', { className: className }, addonBefore, children, addonAfter ); } }, { key: 'renderInput', value: function renderInput() { var _classNames3; var props = (0, _objectAssign2.default)({}, this.props); var prefixCls = props.prefixCls; if (!props.type) { return props.children; } var inputClassName = (0, _classnames2.default)( (_classNames3 = {}, _defineProperty(_classNames3, prefixCls, true), _defineProperty(_classNames3, prefixCls + '-sm', props.size === 'small'), _defineProperty(_classNames3, prefixCls + '-lg', props.size === 'large'), _defineProperty(_classNames3, props.className, !!props.className), _classNames3) ); var placeholder = props.placeholder; // ie9以下placeholder置为null if (placeholder && ieGT9()) { placeholder = null; } if ('value' in props) { // fixControlledValue将undefined或null调整为空字符串 props.value = fixControlledValue(props.value); } switch (props.type) { case 'textarea': return _react2.default.createElement('textarea', _extends({}, props, { placeholder: placeholder, className: inputClassName, ref: 'input' })); default: return _react2.default.createElement('input', _extends({}, props, { placeholder: placeholder, className: inputClassName, ref: 'input' })); } } }, { key: 'render', value: function render() { return this.renderLabledInput(this.renderInput()); } }]); return Input; }(_react2.default.Component); Input.propTypes = { type: _react2.default.PropTypes.string, id: _react2.default.PropTypes.oneOfType([_react2.default.PropTypes.string, _react2.default.PropTypes.number]), size: _react2.default.PropTypes.oneOf(['small', 'default', 'large']), disabled: _react2.default.PropTypes.bool, value: _react2.default.PropTypes.any, defaultValue: _react2.default.PropTypes.any, className: _react2.default.PropTypes.string, addonBefore: _react2.default.PropTypes.node, addonAfter: _react2.default.PropTypes.node, prefixCls: _react2.default.PropTypes.string }; Input.defaultProps = { defaultValue: '', disabled: false, prefixCls: 'ant-input', type: 'text' }; module.exports = Input; module.exports.Group = Group;