在Reactjs中進行表單驗證后，如何讓我的錯誤訊息消失？

我有一個簡單的登錄表單，它接收用戶電子郵件和用戶密碼，目標是在輸入欄位下直接彈出錯誤訊息，并僅在輸入為空或模式錯誤時在輸入周圍添加紅色邊框. 只有我的輸入欄位之一運行正常。（輸入欄位似乎相互依賴？）任何幫助將不勝感激！

一旦密碼滿足要求，另一個輸入欄位將移除紅色邊框，但錯誤訊息仍然存在。目標是同時移除紅色邊框和錯誤訊息

class Login extends Component {
  constructor(props) {
    super(props);

    this.emailInput = React.createRef();
    this.passwordInput = React.createRef();

    this.state = {
      email: "",
      password: "",
      emailError: false,
      passwordError: false,
    };
    this.handleSubmit = this.handleSubmit.bind(this);
    this.handleInputChange = this.handleInputChange.bind(this);
    this.validate = this.validate.bind(this);
  }

  handleInputChange(e) {
    const { value, name } = e.target;
    this.setState({ [name]: value });
    console.log(value);
  }

  validateEmail(userEmail) {
    const emailPattern = /^[a-zA-Z0-9._-] @[a-zA-Z0-9.-] \.[a-zA-Z]{2,4}$/;
    return emailPattern.test(userEmail);
  }

  validatePassword(userPassword) {
    const passwordPattern =
      /^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!@#$%^&*])(?=.{8,})/;
    return passwordPattern.test(userPassword);
  }

  styleBorderEmail(emailInput, styles) {
    this.emailInput.current.style.border = styles;
  }

  styleBorderPassword(passwordInput, styles) {
    this.passwordInput.current.style.border = styles;
  }

  validate() {
    let emailError = this.email;
    let passwordError = this.password;

    if (!this.validateEmail(this.state.email)) {
      emailError = "email not valid";
      this.styleBorderEmail(this.emailInput, "1px solid red");
    } else {
      this.styleBorderEmail(this.emailInput, "1px solid black");
    }
    if (!this.validatePassword(this.state.password)) {
      passwordError = "password not valid";
      this.styleBorderPassword(this.passwordInput, "1px solid red");
    } else {
      this.styleBorderPassword(this.passwordInput, "1px solid black");
    }
    if (emailError || passwordError) {
      this.setState({ emailError, passwordError });
      return false;
    }
    return true;
  }

  handleSubmit(e) {
    e.preventDefault();
    const isValid = this.validate();

    if (isValid) {
      alert("successful submit");

      // clears the form after it's been submitted
      this.setState({
        email: "",
        password: "",
        emailError: false,
        passwordError: false,
      });
    }
  }

  render() {
    return (
      <div className="login-component">
        <div className="login-container">
          <h2>Welcome Back!</h2>
          <br />
          <form onSubmit={this.handleSubmit}>
            <div className="login-group">
              <label htmlFor="email" className="login-label">
                Your email
              </label>
              <input
                className="login-input"
                type="text"
                name="email"
                id="email"
                placeholder="Enter your email"
                value={this.state.email}
                onChange={this.handleInputChange}
                onKeyUp={this.validate}
                ref={this.emailInput}
              />
              {this.state.emailError && (
                <span className="error-login">
                  Please enter a valid email address
                </span>
              )}
            </div>
            <div className="login-group">
              <label htmlFor="password" className="login-label">
                Password
              </label>
              <input
                className="login-input"
                type="password"
                name="password"
                id="password"
                placeholder="Enter your password"
                value={this.state.password}
                onChange={this.handleInputChange}
                onKeyUp={this.validate}
                ref={this.passwordInput}
              />
              {this.state.passwordError && (
                <span className="error-login">Please enter a password</span>
              )}
            </div>
            <div>
              <button type="submit" className="login-btn">
                Login
              </button>
            </div>
          </form>
        </div>
      </div>
    );
  }
}

export default Login;

uj5u.com熱心網友回復：

this.setState({ emailError: "", passwordError: "" });在回傳true之前，您需要在validate函式中添加一行代碼。

新的驗證功能如下所示

validate() {
    let emailError = this.email;
    let passwordError = this.password;

    if (!this.validateEmail(this.state.email)) {
      emailError = "email not valid";
      this.styleBorderEmail(this.emailInput, "1px solid red");
    } else {
      this.styleBorderEmail(this.emailInput, "1px solid black");
    }
    if (!this.validatePassword(this.state.password)) {
      passwordError = "password not valid";
      this.styleBorderPassword(this.passwordInput, "1px solid red");
    } else {
      this.styleBorderPassword(this.passwordInput, "1px solid black");
    }
    if (emailError || passwordError) {
      this.setState({ emailError, passwordError });
      return false;
    }
    this.setState({ emailError: "", passwordError: "" }); // New line added
    return true;
  }

標籤：javascript 反应 验证 输入 用户输入

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