在Redux框架中显示上传或默认徽标可以通过以下步骤实现:
下面是一个示例代码:
// 1. 安装redux和react-redux库
// npm install redux react-redux
// 2. 创建Redux store
import { createStore } from 'redux';
// 定义reducer函数
function logoReducer(state = { logoUrl: '' }, action) {
switch (action.type) {
case 'UPLOAD_LOGO':
return { ...state, logoUrl: action.payload };
default:
return state;
}
}
// 创建store
const store = createStore(logoReducer);
// 3. 创建React组件
import React from 'react';
import { connect } from 'react-redux';
class LogoComponent extends React.Component {
render() {
const { logoUrl } = this.props;
return (
<div>
{logoUrl ? (
<img src={logoUrl} alt="Logo" />
) : (
<p>No logo uploaded</p>
)}
<button onClick={this.handleUpload}>Upload Logo</button>
</div>
);
}
handleUpload = () => {
// 处理上传逻辑,可以使用第三方上传组件或自定义逻辑
// 上传成功后,更新Redux store中徽标的状态
const logoUrl = 'https://example.com/logo.png'; // 假设上传成功后返回的URL
this.props.uploadLogo(logoUrl);
}
}
// 4. 连接Redux store
const mapStateToProps = state => {
return {
logoUrl: state.logoUrl
};
};
const mapDispatchToProps = dispatch => {
return {
uploadLogo: (logoUrl) => dispatch({ type: 'UPLOAD_LOGO', payload: logoUrl })
};
};
export default connect(mapStateToProps, mapDispatchToProps)(LogoComponent);
在上述示例中,Redux store保存了徽标的URL信息。LogoComponent组件通过connect函数连接Redux store,并通过mapStateToProps函数获取徽标的URL。根据徽标的URL来决定显示上传还是默认徽标。
注意:示例中的上传逻辑和Redux store的更新逻辑需要根据实际需求来实现。以上示例仅供参考。
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