Refreshing Component and not all view with react - reactjs

Question

Im already learning about to fetch data from REST API with react, i have to components (form for submit and a card for get data) both summon from parent component (App), and is working, so i got to push new todo to db and get the news values on my card component, but instead only render cards components, render the all App (incluyed the form component), what am i doing wrong guys?
This is the parent Component
import React, { Component } from 'react';
import './App.css';
import SampleCard from './components/SampleCard';
import Form from './components/Form';
class App extends Component {
constructor(props) {
super(props);
this.state = {
data: []
}
}
componentDidMount() {
this.getTasks()
}
getTasks =_=> {
fetch('http://localhost:4000/users')
.then(response => response.json())
.then(data => this.setState({ data: data.data }))
.catch(err => console.log(err))
}
render() {
return (
<div>
<form onSubmit={this.getTasks}>
<Form />
</form>
{this.state.data.map((row, i) => (
<div key={i}>
<SampleCard row={row} />
</div>
))}
</div>
)
}
}
export default App;
This, the form component
import React, { Component } from "react";
class Form extends Component {
constructor(props) {
super(props);
this.state = {
tasks: {
task: '',
status: ''
}
}
}
addTask = _ => {
const { tasks } = this.state
fetch(`http://localhost:4000/users/add?task=${tasks.task}&status=${tasks.status}`)
.catch( err => console.log(err))
}
render() {
const { tasks } = this.state
return (
<div className="Form container mt-3">
<div className="input-group mb-3">
<div className="input-group-prepend">
<span className="input-group-text" id="basic-addon1">
Define Task!
</span>
</div>
<input
type="text"
value={tasks.task}
onChange={e => this.setState({ tasks: { ...tasks, task: e.target.value } })}
className="form-control"
placeholder="Task"
aria-label="Task"
aria-describedby="basic-addon1"
/>
</div>
<div className="input-group mb-3">
<div className="input-group-prepend">
<span className="input-group-text" id="basic-addon1">
Define Status!
</span>
</div>
<input
type="text"
value={tasks.status}
onChange={e => this.setState({ tasks: { ...tasks, status: e.target.value } })}
className="form-control"
placeholder="Status"
aria-label="Status"
aria-describedby="basic-addon1"
/>
</div>
<button
type="Submit"
className="btn btn-outline-success d-flex mr-auto"
onClick={this.addTask}
>
Add
</button>
</div>
);
}
}
export default Form;
and this the card component
import React, { Component } from "react";
export default class SampleCard extends Component {
render() {
return (
<div className="container pt-5">
<div className="col-xs-12">
<div className="card">
<div className="card-header">
<h5 className="card-title">{this.props.row.task}</h5>
</div>
<div className="card-body">
<h4 className="card-title">{this.props.row.created_at}</h4>
{this.props.row.status === 1 ? (
<h3 className="card-title">Pending</h3>
) : (
<h3 className="card-title">Completed</h3>
)}
</div>
</div>
</div>
</div>
);
}
}

Answer 1

You're not preventing default submit behavior. Do it like this
getTasks = (e) => {
e.preventDefault();
fetch('http://localhost:4000/users')
.then(response => response.json())
.then(data => this.setState({ data: data.data }))
.catch(err => console.log(err))
}
Whenever using submit with a form, use e.preventDefault() it prevents refreshing.