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index.js
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/**
* @since 2017-04-11 19:10:08
* @author vivaxy
*/
import React, { Component } from 'react';
import { render, unmountComponentAtNode } from 'react-dom';
import PropTypes from 'prop-types';
import shave from 'shave';
const showLessTextClassName = 'js-show-less-text';
const jsShaveCharClassName = 'js-shave-char';
const resizeEventName = 'resize';
export default class ReactTextMoreLess extends Component {
static propTypes = {
text: PropTypes.string.isRequired,
lessHeight: PropTypes.number.isRequired,
collapsed: PropTypes.bool,
className: PropTypes.string,
showMoreText: PropTypes.string,
showMoreElement: PropTypes.element,
showLessElement: PropTypes.element,
onClick: PropTypes.func,
rootProps: PropTypes.object,
};
static defaultProps = {
collapsed: true,
className: undefined,
showMoreText: '...',
showMoreElement: undefined,
showLessElement: undefined,
onClick: () => {},
rootProps: {},
};
componentDidMount() {
window.addEventListener(resizeEventName, this.setDOM);
this.setDOM();
}
componentWillUpdate() {
// Reset the DOM before update, this makes React render properly.
this.resetDOM();
}
componentDidUpdate() {
this.setDOM();
}
componentWillUnmount() {
this.resetDOM();
window.removeEventListener(resizeEventName, this.setDOM);
}
setRootRef = (root) => {
this.root = root;
};
setDOM = () => {
const {
className,
collapsed,
showMoreText,
lessHeight,
showMoreElement,
showLessElement,
} = this.props;
if (collapsed) {
shave(this.root, lessHeight, {
classname: className,
character: showMoreText,
spaces: false,
});
const shaveChar = this.root.querySelector(`.${jsShaveCharClassName}`);
if (shaveChar && showMoreElement) {
// 如果不需要 ellipse,则没有 `shaveChar`
render(showMoreElement, shaveChar);
}
} else {
const hasShowLess = !!this.root.querySelector(
`.${showLessTextClassName}`
);
if (
this.root.offsetHeight > lessHeight &&
showLessElement &&
!hasShowLess
) {
// 如果需要收起,则展示文字
const collapse = document.createElement('span');
collapse.setAttribute('class', showLessTextClassName);
render(showLessElement, collapse);
this.root.appendChild(collapse);
}
}
};
resetDOM() {
// clean up everything
const { collapsed, showMoreElement } = this.props;
if (collapsed) {
const shaveChar = this.root.querySelector(`.${jsShaveCharClassName}`);
if (shaveChar && showMoreElement) {
unmountComponentAtNode(shaveChar);
}
this.root.innerHTML = this.props.text;
} else {
const collapse = this.root.querySelector(`.${showLessTextClassName}`);
if (collapse) {
unmountComponentAtNode(collapse);
this.root.removeChild(collapse);
}
}
}
render() {
const { className, text, onClick, rootProps } = this.props;
return (
<div
ref={this.setRootRef}
className={className}
onClick={onClick}
{...rootProps}
>
{text}
</div>
);
}
}