Friday, November 6, 2020

Fetch List of Employees in React

Fetch List of Employees in React


List of Employees present at some URI i.e http://127.0.0.1:9091/employee/fetch

[{"id"1001,"name""Dinesh","salary"10000.0},{"id"1002,"name""Kumar","salary"10000.0},{"id"1003,"name""Dinesh","salary"10000.0},{"id"1004,"name""Kumar","salary"10000.0}

] 


React Output:

1001Dinesh10000
1002Kumar10000
1003Dinesh10000
1004Kumar10000


React Code to Fetch this Data:

import React, { useStateuseEffect } from "react";

import UserService from "../services/user.service";


const Employee1 = () => {
  const APIURL = "http://127.0.0.1:9091/employee/fetch";

  const empployee = {
      id: 10013,
      name: "Dinesh",
      salary: 10000.0
  }

  const [empsetEmp] = useState([empployee]);

  useEffect(() => {
      fetchEmployees();
  }, []); // << super important array

  const fetchEmployees = () => {

      fetch(
          `${APIURL}`
      ).then((response=> response.json())
      .then(
        (data=> setEmp(data)
        );

  }

  return (
    <div className="container">
     
  <table>
      {emp.map((emp=> (
                <tr>
                    <td>{emp.id}</td>
                    <td>{emp.name}</td>
                    <td>{emp.salary}</td>
                </tr>
            ))
            }
     </table>
    </div>
  );
};

export default Employee1;

Tuesday, October 20, 2020

Practice Test 1

 

Spring Boot Todos App

 Spring Boot Todos App


import React, { useEffectuseState } from "react";

import { Link } from "react-router-dom";
const axios = require("axios").default;

const Todo = () => {
  const APIURL = "http://127.0.0.1:8080/jpa";

  let id = "id";

  const todoobj = {
    id: 11005,
    username: "dinesh",
    description: "Learn Spring Boot ",
    targetDate: "2020-10-05T10:03:31.432+0000",
    done: false,
  };
  const todoPage = {
    "currentPage": 1,
    "totalPages": 10,
    "totalItems": 10,
    "sortField": "description",
    "sortDirection": "desc",
    "recordPerPage": 10,
    "todosList": [todoobj]
  }

  const [todoPsetTodoP] = useState(todoPage);

  const [todossetTodos] = useState([todoobj]);

  const [directionsetDirection] = useState();
  const [sortFieldsetSortField] = useState("id");




  useEffect(() => {
    fetchTodos();
  }, []); // << super important array


  const fetchTodos = () => {
    // let direction = todoP.direction;
    //console.log("Hello 2"+todoP.sortField);

    //  let sortField = todoP.sortField;
    let recordPerPage = todoP.recordPerPage;
    let currentPageNo = todoP.currentPage;
    /*
        "currentPage": 4,
        "totalPages": 5,
        "totalItems": 10,
        "sortField": "description",
        "sortDirection": "desc",
        "recordPerPage": 2,
    */

    fetch(
      `${APIURL}/users/dinesh/todos/v2/${currentPageNo}/${recordPerPage}?sortField=${sortField}&sortDirection=${direction}`
    )
      .then((response=> response.json())
      .then((data=> {
        setTodoP(data)
        setTodos(data.todosList);
        // setDirection(data.sortDirection);
        console.log(data.sortDirection + " " + direction);
        console.log(todoP);
      });

    console.log("fetched");
  }



  const fetchDataSorted = (event=> {
    event.preventDefault();

    let name = event.target.getAttribute('name')
    let value = event.target.getAttribute('value')

    setSortField(value);

    setTodoP((preValue=> {
      console.log(preValue);
      return {
        ...preValue//Spread Operator 
        [name]: value,
      };
    }
    )

    console.log("Hello" + todoP.sortField);
    //  setDirection((direction=="desc"?"asc":"desc"));
    fetchTodos();
  }


  const handleEdit = (event=> {
    let id = event.target.value;
    console.log("value:" + id);

  }



  const handleDelete = (event=> {
    deleteAPI(event);
    fetchTodos();
  }



  const deleteAPI = (event=> {
    let id = event.target.value;

    let username = "dinesh"
    let URI = `${APIURL}/users/${username}/todos/${id}`;
    console.log(URI);
    axios.delete(URI)
      .then((res=> { console.log(res) })
      .catch((err=> { console.log(err) })

  }



  return (
    <>
      <div class="container">
        <h2>Todos</h2>
        <p>
          My Todos List
        </p>
        <table class="table">
          <thead>
            <tr>
              <th onClick={fetchDataSorted} name="sortField" value="id">ID</th>
              <th onClick={fetchDataSorted} name="sortField" value="username">Username</th>
              <th onClick={fetchDataSorted} name="sortField" value="description">Description</th>
              <th onClick={fetchDataSorted} name="sortField" value="targetDate">Targetate</th>

              <th >Is Done</th>
              <th >Edit</th>
              <th >Delete</th>

            </tr>
          </thead>

          <tbody>
            {todos.map((mytodo=> (
              <tr>
                <td>{mytodo.id}</td>
                <td>{mytodo.username}</td>
                <td>{mytodo.description}</td>
                <td>{mytodo.targetDate}</td>
                <td>{mytodo.done}</td>
                <td><button type="button" className="btn btn-warning" value={mytodo.id} onClick={handleEdit}>Edit</button></td>
                <td><button type="button" className="btn btn-danger" value={mytodo.id} onClick={handleDelete}>Delete</button></td>
              </tr>
            ))}
          </tbody>

        </table>
        <hr />
        <button type="button" className="btn btn-warning" value="Add Todos"> <Link to="/AddTodos">Add Todos </Link></button>
      </div>
    </>
  );
};

export default Todo;





Add Todo

import React, { useState } from 'react'
import { useForm } from "react-hook-form";
import TutorialService from '../../services/TutorialService';
import "./AddTodos.css"
import { useHistory } from "react-router-dom";

const AddTodos = () => {
    const { registerhandleSubmitwatcherrors } = useForm();
    const [submittedsetSubmitted] = useState(false);
    let history = useHistory();

    const onSubmit = data => {
        console.log(data)
        data.username = "dinesh";
        TutorialService.create(data)
            .then(response => {
                console.log(response);
                setSubmitted(true);
            })
            .catch(e => {
                console.log(e);
            });
        history.push('/todo')
    };
    console.log(watch("example")); // watch input value by passing the name of it


    const newAddTodo = () => {
        //  setTutorial(initialTutorialState);
        setSubmitted(false);
    };

    return (
        /* "handleSubmit" will validate your inputs before invoking "onSubmit" */
        <div className="container">
            <div className="row">
                <div className="col-md-3"></div>
                <div className="col-md-6">

                    {(submitted) ?
                        <h3>  Data Submitted Successfully</h3> : ""

                    }
                    <h2>Add Todos</h2>
                    <form className="form-group" onSubmit={handleSubmit(onSubmit)}>
                        <label>Description</label> <input type="text" className="form-control" name="description" defaultValue="test" ref={register({ required: truemaxLength: 30 })} />
                        {errors.desciption && <p className="errorP">*This field is required</p>}

                        <label>Target Date</label> <input type="date" className="form-control" name="targetDate" ref={register({ required: true })} />
                        {errors.targetdate && <p className="errorP">*This field is required</p>}

                        <input type="submit" className="btn btn-success" />
                    </form>
                </div>
                <div className="col-md-3"></div>
            </div>
        </div>
    )
}


export default AddTodos
HTTP

import http from "../http-common";

  const create = data => {
    return http.post(`/users/${data.username}/todos`data);
  };

API Call

import axios from "axios";

export default axios.create({
  baseURL: "http://localhost:8080/jpa",
  headers: {
    "Content-type": "application/json"
  }
});

Saturday, October 3, 2020

Install and Use Bootstrap in React

 Install and Use Bootstrap in React

1. Visit: https://www.npmjs.com/package/bootstrap  for Information.

2.  In React Application run npm install bootstrap

3. Use Bootstrap: import in jsx, i.e in App.js 

    import '../node_modules/bootstrap/dist/css/bootstrap.min.css'


Now you can use Bootstrap elements:

Example use Bootstrap Button:

<button className="btn btn-success">Hello</button>


Friday, October 2, 2020

Handling Form Inputs in React in less lines of code

 Handling Form Inputs in React (less lines of code)




import React, { useState } from 'react'

const MyFormObject = () => {

    const USER = {
        id: "1",
        name: "Dinesh",
        salary: 10000
    }

    const [usersetUser] = useState(USER)

    const onSubmitHandler = (event=> {
        event.preventDefault();
        console.log(user)
    }

//handling Form Input 
    const handleInput = (event=> {
        let name = event.target.name;
        let value = event.target.value;
        setUser((preValue=> {
            console.log(preValue);
            return {
                ...preValue//Spread Operator 
                [name]: value,
            };
        }
        )
        console.log(event.target.value)
    }

    return (
   <> //Fragment
    <form onSubmit={onSubmitHandler}>

       UserID:   
<input type="text" name="id" value={user.id} onChange={handleInput} /><br />
       Name 
<input type="text" name="name" value={user.name} onChange={handleInput} /><br />
       Salary 
<input type="text" name="salary" value={user.salary} onChange={handleInput} /><br />
                
<input type="submit" value="Submit" />

    </form>
  </>
    )

}

export default MyFormObject


App.js Code Snippet:

const LearningComponent = () => {
  return (
    <div>
     <h1> Learning Component </h1>
      <MyFormObject />
    </div>
  )
}

export default App;

Add User List in React - A Simple Example to Add data to List

Add User List in React 

A Simple Example to Add to List




import
 React, { useState } from 'react'
const MyForms = () => {
    const initialList = [
        'userA',
        'userB',
        'userC',
    ];
    const [usernamesetUsername] = useState();
    const [userdatasetUserList] = useState(initialList);


    const onInputChangeHandler = event => {
        event.preventDefault();
        setUsername(event.target.value)
    }
    const onSubmitHandler = event => {

        if (username) {
            setUserList(userdata.concat(username));
        }
        event.preventDefault();
    }
    return (


         <form onSubmit={onSubmitHandler}>
            <h1>{username}</h1>
            <h2>
                {
                    userdata.map((user=> <li> {user}</li>)
                }
            </h2>
           UserName:  <input type="text" value={username} 

onChange={onInputChangeHandler} />


             <input type="submit" value="Add User" />

        
</form>
    )
}

export default MyForms

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