react或react native表单输入的时候要输入价格,这个价格输入要做一定限制,需要满足一下情况:
通过上面的限制最终得到结果如下:
import React from 'react'
import { render } from 'react-dom'
export default class NameForm extends React.Component {
constructor(props) {
super(props);
this.state = { value: '' };
handleChange = (event) => {
// 过滤只能输入小数点和数字
let val = event.target.value.toString().replace(/[^\d^\.?]+/g, "").replace(/^0+(\d)/, "$1").replace(/^\./, "0.").match(/^\d*(\.?\d{0,2})/g)[0] || ""
this.setState({ value: val });
render() {
return (
<label>
<input type="text" value={this.state.value} onChange={this.handleChange} />
</label>
<input type="submit" value="提交" />
</form>