javascript - 如何在 mvc asp.net 中将表单数据从 reactjs 发布到 Controller

Question

我是 React 的新手。我正在尝试在 asp.net 中创建一个带有反应的表单。当将表单数据从 reactjs 发布到 mvc asp.net 中的 Controller 时，数据未被传递。我在下面分享了我的代码。请让我知道我必须进行哪些更改才能使其正常工作。

Controller :

[Route("InputEmployee")]

        public void InputEmployee([FromBody]EmployeeTable Employee)
        {
            db.EmployeeTables.Add(Employee);
                   db.SaveChanges();           
        }

Reactjs 代码:

class InputValues extends React.Component {
    constructor(props) {
        super(props);
        this.handleSubmit = this.handleSubmit.bind(this);
    }

    handleSubmit(e) {
        e.preventDefault();
        const data = new FormData();
        data.append = this.firstName.value;
        data.append = this.lastName.value;
        data.append = this.gender.value;
        data.append = this.designation.value;
        data.append = this.salary.value;
        data.append = this.city.value;
        data.append = this.country.value;
        var xhr = new XMLHttpRequest();
        xhr.open('post', this.props.url, true);
        xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        xhr.onreadystatechange = function() {
            if(xhr.readyState == XMLHttpRequest.DONE && xhr.status == 200) {
                // Do something on success
            }
        }
        xhr.send(data);
    }

    render() {
        return(
          <div>       
              <form onSubmit={this.handleSubmit}>
          <label htmlFor="FirstName">First Name </label><br/>
          <input id="FirstName" type="text"  placeholder="Enter First Name" ref={(firstName) => this.firstName = firstName} />
          <br/><br/>
          <label htmlFor="LastName">Last Name: </label><br/>
          <input id="LastName" type="text"  placeholder="Enter Last Name"  ref={(lastName) => this.lastName = lastName} />
          <br/><br/>
          <label htmlFor="Gender">Gender: </label><br/>
          <input id="Gender" type="text"  placeholder="Gender"  ref={(gender) => this.gender = gender} />
          <br/><br/>
          <label htmlFor="Designation">Designation: </label><br/>
          <input id="Designation" type="text"  placeholder="Enter Designation" ref={(designation) => this.designation = designation} />
          <br/><br/>
          <label htmlFor="Salary">Salary: </label><br/>
          <input id="Salary" type="number"  placeholder="Enter Salary" ref={(salary) => this.salary = salary} />
          <br/><br/>
          <label htmlFor="City">City: </label><br/>
          <input id="City" type="text"  placeholder="Enter City" ref={(city) => this.city = city} />
          <br/><br/>
          <label htmlFor="Country">Country: </label><br/>
          <input id="Country" type="text"  placeholder="Enter Country" ref={(country) => this.country = country} />
          <p>
            <button type="submit">Submit</button>
          </p>
        </form>
      </div>
    );
          }
};

ReactDOM.render(<InputValues url="api/Employee/InputEmployee" />,
          document.getElementById('grid1'))   

值没有被传递:

在追加中进行更改后:

Answer 1

您没有正确构建您的 FormData 对象，append是一个函数，所以你需要这样使用它:

data.append = ...; // wrong, overwrites the append function
data.append('key', 'value'); // correct, calls the function

此外，我建议使用 native Fetch API用于发送 Web 请求，因为它比处理原始 XHR 请求要简洁得多。它还不是 100% 跨浏览器，但有各种库可以用作 polyfill，例如whatwg-fetch