How do I set the status of a variable of a class in a method that using this keyword

Question

I am trying to display the outcome of a reset service in my Ionic react app. I am unable to use the this.setState({resetSuccess}) because I am trying to do that in a method, and this would refer to the method's scope. (I have also mentioned the issue as comments)

Please refer to the code below:

 private async handleSubmit(e: React.FormEvent, ): Promise<any> { e.preventDefault(); try { console.log(`These are the reset params---->${JSON.stringify(Reset.resetParams)}`) const resetService = new ResetService(); const resetResponse: ResetResponse = await resetService.reset(Reset.resetParams); console.log(`This is the response from the API ----> ${JSON.stringify(resetResponse)}`) if (resetResponse.status === 401) { console.log("Authentication failed"); } else if (resetResponse.status === 200) { console.log("Password reset successfully"); const resetSuccess: boolean = true; this.setState({ resetSuccess }) // ****How do I set this state? which is in the class's scope? Reset.history.push('/login'); } } catch (e) { console.log(`Request failed: ${e}`); const resetSuccess: boolean = false; this.setState({ resetSuccess }) } }

This is my render function:

 public render() { const { resetSuccess, errors } = this.state; const context: FormContext = { ...this.state, setValues: this.setValues, validate: this.validate }; return ( <IonPage id="login-registration-page"> <IonHeader> <IonToolbar color="primary"> <IonTitle>Reset Password</IonTitle> </IonToolbar> </IonHeader> <IonContent> <FormContext.Provider value={context}> <form onSubmit={this.handleSubmit} className="login-registration-form ion-padding"> <div className="container"> {this.props.render()} <div className="form-group"> <IonButton type="submit" disabled={!this.completeValidation} expand="block" >Submit</IonButton> </div> {resetSuccess === true && ( //*****This is what I am trying to display based on the outcome <div className="alert alert-info" role="alert"> Password reset successfull. You will be redirected shortly to the login page </div> )} {resetSuccess === false && ( <div className="alert alert-danger" role="alert"> Either the link that you have clicked on or the current password you provided is incorect. Please use the right verification link you received and input the correct password. </div> )} </div> </form> </FormContext.Provider> </IonContent> </IonPage> ) }

Answer 1

There are a couple ways to do this, but I would suggest using a function that returns your desired handleSubmit function using the correct setState handler. By using a function that returns a function, you can have access to the scope of the component to pass the desired setState method to your handleSubmit function.

private async handleSubmit(): 
  (e: React.FormEvent) => Promise<any> {
        const setState = this.setState; // Define local reference to setState

        return (e: React.FormEvent) => {
        e.preventDefault();
        try {
            console.log(`These are the reset params---->${JSON.stringify(Reset.resetParams)}`)
            const resetService = new ResetService();
            const resetResponse: ResetResponse = await resetService.reset(Reset.resetParams);
            console.log(`This is the response from the API ----> ${JSON.stringify(resetResponse)}`)

            if (resetResponse.status === 401) {
                console.log("Authentication failed");

            }
            else if (resetResponse.status === 200) {
                console.log("Password reset successfully");
                const resetSuccess: boolean = true;
                setState({ resetSuccess }) // Now referring to your local reference
                Reset.history.push('/login');
            }
        } catch (e) {
            console.log(`Request failed: ${e}`);
            const resetSuccess: boolean = false;
            setState({ resetSuccess }) // Now referring to your local reference
        }
      }
  }

Then in your render method, call the handleSubmit method instead, as it now returns the desired handler:

<form onSubmit={this.handleSubmit()} className="login-registration-form ion-padding">

Answer 2

Binding the handleSubmit method to the class in the constructor worked.

 constructor(props: any) { super(props); const errors: Errors = {}; const values: Values = {}; this.state = { errors, values }; this.currentPasswordProvided = false; this.passwordValidated = false; this.completeValidation = false; this.emailAddress = ''; Reset.history = this.props.history; this.handleSubmit=this.handleSubmit.bind(this) //<------ Binding it to the class is required because when the submit is clicked, the handler gets unmounted, and this will not be defined in the handleSubmit. }