Question

我不能在静态函数内调用函数。在包含循环映射以创建列表的静态函数内部，在内部使用a onClick调用函数，但无法正常工作。我不知道要正确解析功能

ListData.js

constructor(props) {
    super(props);
    this.state = {
        forecasts: [],
        loading: true
    };

    // This binding is necessary to make "this" work in the callback  
    this.getClientReport = this.getClientReport.bind(this);
    this.handleDelete = this.handleDelete.bind(this);

    fetch('api/SampleData/Employees')
        .then(response => response.json())
        .then(data => {
            this.setState({ forecasts: data, loading: false });
        });
}

//handle download file
getClientReport(id) {
    alert('test')
}

//handle delete
handleDelete(id) {
    alert('test')
}

//handle table
static renderForecastsTable(forecasts) {
    return (
        <table className='table table-striped'>
            <thead>
                <tr>
                    <th>No</th>
                    <th>Name</th>
                    <th>Photo</th>
                    <th>Height</th>
                    <th>Weight</th>
                    <th></th>
                </tr>
            </thead>
            <tbody>
                {forecasts.map((forecast, index) =>
                    <tr key={forecast.employeeId}>
                        <td>{index + 1}</td>
                        <td>{forecast.employeeName}</td>
                        <td><a onClick={() => this.getClientReport(forecast.employeeId)}>Download File</a></td>
                        <td>{forecast.height}</td>
                        <td>{forecast.weight}</td>
                        <td>
                            <Link to={"/add-list/" + forecast.employeeName}>Edit</Link> | 
                            <a onClick={() => this.handleDelete(forecast.employeeId)}>Delete</a>
                        </td>
                    </tr>
                )}
            </tbody>
        </table>
    );
}

render() {
    let contents = this.state.loading
        ? <p><em>Loading...</em></p>
        : ListData.renderForecastsTable(this.state.forecasts);

    return (
        <div>
            <h2>List Employee</h2>
            {contents}
        </div>
    );
}

handleDelete和getClientReport无法在HTML中创建onclick

Answer 1

请勿将其设置为static

static关键字为类定义了静态方法。在类的实例上未调用静态方法。而是在类本身上调用它们。这些通常是实用程序功能，例如用于创建或克隆对象的功能。

（https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/static）

进行更改后，请不要忘记将render改为使用this.renderForecastsTable(this.state.forecasts)而不是ListData.renderForecastsTable(this.state.forecasts)。

Answer 2

静态方法将没有与调用类实例相同的tag。我建议您将方法设为非静态，我认为没有理由这样做。另一种选择是传递必需的方法（tag和null作为附加参数。

无法在静态函数ReactJs中调用函数

2 个答案: