ReactJS and Axios Tutorial
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Questions and Answers

What is the purpose of the handleSearch function?

  • To retrieve a customer record from the database based on the customer number (correct)
  • To delete a customer record from the database
  • To update a customer record in the database
  • To insert a new customer record into the database

    • What happens when the handleUpdate function is called with a valid customer number?

  • The existing customer record is updated in the database (correct)
  • The database connection is closed
  • A new customer record is inserted into the database
  • The customer record is deleted from the database

    • What is the purpose of the useState hook in the Update function?

  • To render the HTML template for the component
  • To handle user input validation
  • To handle HTTP requests to the server
  • To manage state variables in the React component (correct)

    • What is the URL used to update a customer record in the handleUpdate function?

    <p><a href="http://localhost:3030/updatebycustomernumber/$%7BcustomerNumber">http://localhost:3030/updatebycustomernumber/${customerNumber</a>}</p> Signup and view all the answers

    What happens when the handleSearch function is called with an invalid customer number?

    <p>An error message is displayed to the user</p> Signup and view all the answers

    What is the purpose of the axios.put method in the handleUpdate function?

    <p>To make a PUT request to update an existing customer record</p> Signup and view all the answers

    Study Notes

    React Hooks and State

    • The code uses useState hook to create state variables for customerNumber, customerName, flowerName, customerAddress, and responseMessage.
    • The initial value of each state variable is an empty string.

    Handle Update Function

    • The handleUpdate function is an async function that updates a record in the database.
    • It takes the current state values of customerName, flowerName, customerAddress, and customerNumber and creates a new object updatedRecord.
    • It uses axios.put to send a PUT request to <a href="http://localhost:3030/updatebycustomernumber/$%7BcustomerNumber">http://localhost:3030/updatebycustomernumber/${customerNumber</a>} with the updatedRecord as the request body.
    • If the request is successful, it sets the responseMessage state to the response data from the server.
    • If the request fails, it catches the error and sets the responseMessage state to an error message.

    Handle Search Function

    • The handleSearch function is an async function that searches for a customer record in the database.
    • It takes the current state value of customerNumber and uses axios.get to send a GET request to <a href="http://localhost:3030/searchcustomernumber/$%7BcustomerNumber">http://localhost:3030/searchcustomernumber/${customerNumber</a>}.
    • If the request is successful, it checks if the response data contains a CustomerName property.
    • If the property exists, it updates the state values of customerName, flowerName, and customerAddress with the corresponding values from the response data.
    • If the property does not exist, it sets the responseMessage state to a "Customer not found" message and resets the state values of customerName, flowerName, and customerAddress to empty strings.
    • If the request fails, it catches the error and sets the responseMessage state to an error message.

    JSX Elements

    • The code returns JSX elements that include input fields for customerNumber, customerName, flowerName, and customerAddress.
    • The input fields have onChange event handlers that update the corresponding state variables.
    • The code also includes a submit button that triggers the handleUpdate function when clicked.
    • The responseMessage state is displayed below the input fields.

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    Description

    Learn about ReactJS and Axios by updating customer records. Understand how to use React hooks to manage state and Axios for making API calls.

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