我正在努力构建一个随用户输入自动增长/缩小的React Textarea。我受此代码笔启发而构建了我的组件:https://codepen.io/Libor_G/pen/eyzwOx
虽然我的工作很好,但是却出现es-lint错误,不确定如何正确解决。 eslint不喜欢我在handleChange函数中使用事件参数。
解决此问题的正确方法是什么?
我的REACT UIC:
import React from 'react';
import PropTypes from 'prop-types';
import styled from 'styled-components';
const TEXTAREA_LINE_HEIGHT = 24;
const PADDING = 16;
const StyledTextArea = styled.textarea`
resize: none;
width: 100%;
padding: ${PADDING}px;
line-height: ${TEXTAREA_LINE_HEIGHT}px;
font-size: 17px;
`;
class TextArea extends React.Component {
constructor(props) {
super(props);
this.state = {
value: '',
rows: 1,
minRows: 1,
maxRows: 3,
};
}
handleChange = (event) => {
const { minRows, maxRows } = this.state;
const previousRows = event.target.rows;
event.target.rows = minRows; // reset number of rows in textarea
const currentRows = Math.floor((event.target.scrollHeight - (PADDING * 2)) / TEXTAREA_LINE_HEIGHT);
if (currentRows === previousRows) {
event.target.rows = currentRows;
}
if (currentRows >= maxRows) {
event.target.rows = maxRows;
event.target.scrollTop = event.target.scrollHeight;
}
this.setState({
value: event.target.value,
rows: currentRows < maxRows ? currentRows : maxRows,
});
};
render = () => {
const {
name,
placeholder,
} = this.props;
return (
<StyledTextArea
innerRef={(ref) => {
this.textAreaRef = ref;
}}
name={name}
placeholder={placeholder}
rows={this.state.rows}
value={this.state.value}
onChange={this.handleChange}
/>
);
}
}
TextArea.defaultProps = {
name: null,
placeholder: null,
};
TextArea.propTypes = {
name: PropTypes.string,
placeholder: PropTypes.string,
};
export default TextArea;
答案 0 :(得分:1)
您可以禁用我在评论中提到的规则,如下所示:
/*eslint no-param-reassign: ["error", { "props": false }]*/
或者,如果您不想忽略eslint,则可以将参数分配给新变量:
const ev = event
,您可以使用ev代替event。