1 files changed, 105 insertions, 0 deletions

diff --git a/src/Select.jsx b/src/Select.jsx
new file mode 100644
index 0000000..e25bb29
--- /dev/null
+++ b/src/Select.jsx
@@ -0,0 +1,105 @@
+import React, { PropTypes } from 'react';
+import ReactDom from 'react-dom';
+import classnames from 'classnames';
+
+const scrollTo = (element, to, duration) => {
+  const requestAnimationFrame = window.requestAnimationFrame ||
+    function requestAnimationFrameTimeout() {
+      return setTimeout(arguments[0], 10);
+    };
+  // jump to target if duration zero
+  if (duration <= 0) {
+    element.scrollTop = to;
+    return;
+  }
+  const difference = to - element.scrollTop;
+  const perTick = difference / duration * 10;
+
+  requestAnimationFrame(() => {
+    element.scrollTop = element.scrollTop + perTick;
+    if (element.scrollTop === to) return;
+    scrollTo(element, to, duration - 10);
+  });
+};
+
+const Select = React.createClass({
+  propTypes: {
+    prefixCls: PropTypes.string,
+    options: PropTypes.array,
+    selectedIndex: PropTypes.number,
+    type: PropTypes.string,
+    onSelect: PropTypes.func,
+    onMouseEnter: PropTypes.func,
+  },
+
+  componentDidMount() {
+    // jump to selected option
+    this.scrollToSelected(0);
+  },
+
+  componentDidUpdate(prevProps) {
+    // smooth scroll to selected option
+    if (prevProps.selectedIndex !== this.props.selectedIndex) {
+      this.scrollToSelected(120);
+    }
+  },
+
+  onSelect(value) {
+    const { onSelect, type } = this.props;
+    onSelect(type, value);
+  },
+
+  getOptions() {
+    const { options, selectedIndex, prefixCls } = this.props;
+    return options.map((item, index) => {
+      const cls = classnames({
+        [`${prefixCls}-select-option-selected`]: selectedIndex === index,
+        [`${prefixCls}-select-option-disabled`]: item.disabled,
+      });
+      let onclick = null;
+      if (!item.disabled) {
+        onclick = this.onSelect.bind(this, +item.value);
+      }
+      return (<li
+        className={cls}
+        key={index}
+        onClick={onclick}
+        disabled={item.disabled}
+      >
+        {item.value}
+      </li>);
+    });
+  },
+
+  scrollToSelected(duration) {
+    // move to selected item
+    const select = ReactDom.findDOMNode(this);
+    const list = ReactDom.findDOMNode(this.refs.list);
+    let index = this.props.selectedIndex;
+    if (index < 0) {
+      index = 0;
+    }
+    const topOption = list.children[index];
+    const to = topOption.offsetTop;
+    scrollTo(select, to, duration);
+  },
+
+  render() {
+    if (this.props.options.length === 0) {
+      return null;
+    }
+
+    const { prefixCls } = this.props;
+
+    return (
+      <div
+        className={`${prefixCls}-select`}
+        onMouseEnter={this.props.onMouseEnter}
+      >
+        <ul ref="list">{this.getOptions()}</ul>
+      </div>
+    );
+  },
+});
+
+export default Select;