1 import React, {PropTypes} from 'react';
2 import ReactDom from 'react-dom';
3 import classnames from 'classnames';
5 const scrollTo = (element, to, duration) => {
6 const requestAnimationFrame = window.requestAnimationFrame ||
7 function requestAnimationFrameTimeout() {
8 return setTimeout(arguments[0], 10);
10 // jump to target if duration zero
12 element.scrollTop = to;
15 const difference = to - element.scrollTop;
16 const perTick = difference / duration * 10;
18 requestAnimationFrame(() => {
19 element.scrollTop = element.scrollTop + perTick;
20 if (element.scrollTop === to) return;
21 scrollTo(element, to, duration - 10);
25 const Select = React.createClass({
27 prefixCls: PropTypes.string,
28 options: PropTypes.array,
29 gregorianCalendarLocale: PropTypes.object,
30 selectedIndex: PropTypes.number,
31 type: PropTypes.string,
32 onSelect: PropTypes.func,
36 // jump to selected option
37 this.scrollToSelected(0);
40 componentDidUpdate() {
41 // smooth scroll to selected option
42 this.scrollToSelected(120);
46 const { onSelect, type } = this.props;
47 onSelect(type, value);
51 const { options, selectedIndex, prefixCls } = this.props;
52 return options.map((item, index) => {
53 const selected = selectedIndex === index;
54 const cls = classnames({
55 [`${prefixCls}-select-option-selected`]: selected,
57 return <li className={cls} key={index} onClick={this.onSelect.bind(this, +item)}>{item}</li>;
61 scrollToSelected(duration) {
62 // move to selected item
63 const select = ReactDom.findDOMNode(this);
64 const list = ReactDom.findDOMNode(this.refs.list);
65 let index = this.props.selectedIndex - 1;
69 const topOption = list.children[index];
70 const to = topOption.offsetTop - select.offsetTop;
71 scrollTo(select, to, duration);
75 if (this.props.options.length === 0) {
79 const { prefixCls } = this.props;
82 <div className={`${prefixCls}-select`}>
83 <ul ref="list">{this.getOptions()}</ul>
89 export default Select;