react setState() from external? - javascript

New to Reactjs, I have followed a tut or 2 to build a relatively simple app, that sends queries to Mongodb and renders the results. Although I am yet to render them. I can pass the find() through and get back results that I like, and log them to the console, but for the life of me I cannot figure out how to get the results into "state", or anywhere else in the app. It's likely a very simple mistake somewhere. But I don't have enough knowledge of react to figure it out.
Here is the (small) App.js file in it's entirety, I thought it easier than trying to pick through it and make a valid sample.
// /client/App.js
import React, { Component } from 'react';
import axios from 'axios';
import * as PropTypes from "prop-types";
import {useEffect, useState} from "react";
function View(props) {
return null;
}
View.propTypes = {children: PropTypes.node};
function Text(props) {
return null;
}
function MyForm() {
const [user_search, setName] = useState("");
const handleSubmit = async (event) => {
event.preventDefault();
console.log(`The Search you entered was: ${user_search}`);
let felcher = user_search.split(/[ ,]+/);
let search_obj = {}
for (let i in felcher) {
search_obj[i] = felcher[i]
}
axios.post('http://localhost:3001/api/searchData', {
search_obj
}
).then(resp => {
console.log("RESPONSE FROM POST", resp['data'])
});
}
return (
<form onSubmit={handleSubmit}>
<label>Enter Search Terms:
<input
type="text"
value={user_search}
onChange={(e) => setName(e.target.value)}
/>
</label>
<input type="submit" />
</form>
)
}
let formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',})
Text.propTypes = {children: PropTypes.node};
class App extends Component {
// initialize our state
state = {
data: [],
_id: 0,
ticker: '',
primary_share: [],
title: null,
document_date: null,
release_date: null,
search_text: null,
url: null,
result_state: null,
};
componentDidMount() {
this.getDataFromDb();
if (!this.state.intervalIsSet) {
let interval = setInterval(this.getDataFromDb, 1000);
this.setState({ intervalIsSet: interval });
}
}
componentWillUnmount() {
if (this.state.intervalIsSet) {
clearInterval(this.state.intervalIsSet);
this.setState({ intervalIsSet: null });
}
}
getDataFromDb = () => {
fetch('http://localhost:3001/api/getData')
.then((data) => data.json())
.then((res) => this.setState({ data: res.data }));
};
render() {
const { data } = this.state;
return (
<div>
<MyForm />
<div class={"row"}>
<div class={"col-4"}>
{/*<ul>*/}
{/* {data.length <= 0*/}
{/* ? 'Getting Results......'*/}
{/* : data.map((dat) => (*/}
{/* <li class="border" style={{ padding: '10px' }} key={dat._id}>*/}
{/* <span style={{ color: 'gray' }}> Ticker: </span> {dat.ticker} <br />*/}
{/* <span style={{ color: 'gray' }}> Release Date: </span> {dat.release_date} <br />*/}
{/* <span style={{ color: 'gray' }}> Document Title: </span>{dat.title} <br />*/}
{/* <span style={{ color: 'gray' }}> Document URL: </span>{dat.url} <br />*/}
{/* </li>*/}
{/* ))}*/}
{/*</ul>*/}
</div>
</div>
</div>
);
}
}
export default App;
The area I am struggling with is where print the results to the console here ...
console.log("RESPONSE FROM POST", resp['data'])
In the "MyForm()" function. I feel if I could setState() there, but it appears to not work.
But I can't do anything else that gets them over to render. HELP!!!!

SetState is a hook that returns two items: the state and setter (or the function to set the state). In your case you will have a setState at the top of your function:
const [data, setData] = useState([]) // what ever you put as an argument will be the default data until it is set
const [err, setErr] = useState(null) // this will be our error state
In your axios request you will use:
axios
.post('http://localhost:3001/api/searchData', { search_obj })
.then(resp => {
setData(resp['data']) // see here we call the state function
})
.catch(err => {
setErr(err) // and here for our error
})
Then in our return we can use the data any way we like:
return (
<>
<div>{data}</data>
<div>{err ? err : 'no errors'}</div>
</>
)
Does that make sense? (Code not tested)

Related

Antd Design EditableRow not changing buttons from "edit" to "save" and "cancel"

Im using Antd library and i can't seem to find where i have the bug.
This is my EditableTableCell component
import React, {Component} from 'react';
import { Form } from '#ant-design/compatible';
import '#ant-design/compatible/assets/index.css';
import { Input, InputNumber, Select, DatePicker } from "antd";
import moment from "moment";
import {EditableContext} from "./EditableTableRow";
const FormItem = Form.Item;
const Option = Select.Option;
class EditableTableCell extends Component {
getInput = (record, dataIndex, title, getFieldDecorator) => {
switch (this.props.inputType) {
case "number":
return (
<FormItem style={{ margin: 0 }}>
{getFieldDecorator(dataIndex, {
rules: [
{
required: true,
message: `Please Input ${title}!`
}
],
initialValue: record[dataIndex]
})(
<InputNumber formatter={value => value} parser={value => value} />
)}
</FormItem>
);
case "date":
return (
<FormItem style={{ margin: 0 }}>
{getFieldDecorator(dataIndex, {
initialValue: moment(record[dataIndex], this.dateFormat)
})(<DatePicker format={this.dateFormat} />)}
</FormItem>
);
case "select":
return (
<FormItem style={{ margin: 0 }}>
{getFieldDecorator(dataIndex, {
initialValue: record[dataIndex]
})(
<Select style={{ width: 150 }}>
{[...Array(11).keys()]
.filter(x => x > 0)
.map(c => `Product ${c}`)
.map((p, index) => (
<Option value={p} key={index}>
{p}
</Option>
))}
</Select>
)}
</FormItem>
);
default:
return (
<FormItem style={{ margin: 0 }}>
{getFieldDecorator(dataIndex, {
rules: [
{
required: true,
message: `Please Input ${title}!`
}
],
initialValue: record[dataIndex]
})(<Input />)}
</FormItem>
);
}
}
render() {
const { editing, dataIndex, title, inputType, record, index,...restProps} = this.props;
return (
<EditableContext.Consumer>
{form => {
const { getFieldDecorator } = form;
return (
<td {...restProps}>
{editing ?
this.getInput(record, dataIndex, title, getFieldDecorator)
: restProps.children}
</td>
);
}}
</EditableContext.Consumer>
);
}
}
export default EditableTableCell;
This is my EditableTableCell component
import React, {Component} from 'react';
import { Form} from '#ant-design/compatible';
export const EditableContext = React.createContext();
class EditableTableRow extends Component {
render() {
return (
<EditableContext.Provider value={this.props.form}>
<tr {...this.props} />
</EditableContext.Provider>
);
}
}
export default EditableTableRow=Form.create()(EditableTableRow);
This is my ProductsPage component im having bug in
import React, {Component} from 'react';
import {Button, Layout, notification, Popconfirm, Space, Table,Typography} from "antd";
import {Link} from "react-router-dom";
import {Content} from "antd/es/layout/layout";
import EditableTableRow, {EditableContext} from "../components/EditableTableRow";
import EditableTableCell from "../components/EditableTableCell";
import API from "../server-apis/api";
import {employeesDataColumns} from "../tableColumnsData/employeesDataColumns";
import {CheckCircleFilled, InfoCircleFilled} from "#ant-design/icons";
class ProductsPage extends Component {
constructor(props) {
super(props);
this.state = {
data: [],
error: null,
isLoaded: false,
editingKey: "",
errorMessage: "",
}
}
columns = [
...employeesDataColumns,
{
title: "Actions",
dataIndex: "actions",
width: "10%",
render: (text, record) => {
const editable = this.isEditing(record);
return editable ? (
<span>
<EditableContext.Consumer>
{form => (<a onClick={() => this.saveData(form, record.username)} style={{ marginRight: 8 }}>Save</a>)}
</EditableContext.Consumer>
<a onClick={this.cancel}>Cancel</a>
</span>
) : (
<Space size="middle">
<a onClick={() => this.edit(record.username)}>Edit</a>
<Popconfirm title="Are you sure you want to delete this product?"
onConfirm={() => this.remove(record.username)}>
<a style={{color:"red"}}>Delete</a>
</Popconfirm>
</Space>
);
},
}
];
isEditing = (record) => {
return record.username === this.state.editingKey;
};
edit(username) {
this.setState({editingKey:username});
}
cancel = () => {
this.setState({ editingKey: ""});
};
componentDidMount() {
this.setState({ loading: true });
const token="Bearer "+ JSON.parse(localStorage.getItem("token"));
API.get(`users/all`,{ headers: { Authorization: token}})
.then(res => {
// console.log(res.data._embedded.productList);
const employees = res.data._embedded.employeeInfoDtoList;
this.setState({loading: false,data:employees });
})
}
async remove(username) {
const token="Bearer "+ JSON.parse(localStorage.getItem("token"));
API.delete(`/users/${username}`,{ headers: { Authorization: token}})
.then(() => {
let updatedProducts = [...this.state.data].filter(i => i.username !== username);
this.setState({data: updatedProducts});
this.successfullyAdded("Employee is deleted. It wont have any access to the website anymore.")
}).catch(()=>this.errorHappend("Failed to delete"));
}
hasWhiteSpace(s) {
return /\s/g.test(s);
}
saveData(form,username) {
form.validateFields((error, row) => {
if (error) {
return;
}
const newData = [...this.state.data];
const index = newData.findIndex(item => username === item.username);
const item = newData[index];
newData.splice(index, 1, {
...item,
...row
});
const token="Bearer "+ JSON.parse(localStorage.getItem("token"));
const response = API.put(`/users/${username}/update`, row,{ headers: { Authorization: token}})
.then((response) => {
this.setState({ data: newData, editingKey: ""});
this.successfullyAdded("Empolyee info is updated")
})
.catch(error => {
this.setState({ errorMessage: error.message });
this.errorHappend("Failed to save changes.")
console.error('There was an error!', error);
});
});
}
successfullyAdded = (message) => {
notification.info({
message: `Notification`,
description:message,
placement:"bottomRight",
icon: <CheckCircleFilled style={{ color: '#0AC035' }} />
});
};
errorHappend = (error) => {
notification.info({
message: `Notification`,
description:
`There was an error! ${error}`,
placement:"bottomRight",
icon: <InfoCircleFilled style={{ color: '#f53333' }} />
});
};
render() {
const components = {
body: {
row: EditableTableRow,
cell: EditableTableCell
}
};
const columns = this.columns.map(col => {
if (!col.editable) {
return col;
}
return {
...col,
onCell: record => {
const checkInput = index => {
switch (index) {
case "price":
return "number";
default:
return "text";
}
};
return {
record,
// inputType: col.dataIndex === "age" ? "number" : "text",
inputType: checkInput(col.dataIndex),
dataIndex: col.dataIndex,
title: col.title,
editing: this.isEditing(record)
};
}
};
});
const { data, loading } = this.state;
return (
<Layout>
<div>
<Link to="/add-product">
<Button style={{float:"right", background: "#0AC035",marginBottom:"1em", marginTop:"1em" }}
type="primary">New emplyee</Button>
</Link>
</div>
<Content>
<Table components={components} bordered dataSource={data} columns={columns} loading={loading} rowKey={data.username} rowClassName="editable-row"/>
</Content>
</Layout>
);
}
}
export default ProductsPage;
This is the bug I'm having:
enter image description here
And i want to have this result like its shown in Antd docs:
enter image description here
Id really appreciate if you take a look and help me figure out where im wrong
Updated Solution:
I find the issue. In render where you map the columns, you just return the column if it's not an editable column. You can check the code below. I added a check if it's dataIndex === 'actions', then return the following code:
Please Follow the link:
https://react-ts-v3fbst.stackblitz.io
Changes:
1.In columns, i remove the render function from the action object:
{
title: 'Actions',
dataIndex: 'actions',
width: '10%',
},
2. In render function where you map the columns, add the following code before this condition if(!col.editable) {,:
if (col.dataIndex === 'actions') {
return {
...col,
render: (text, record) => {
const editable = this.isEditing(record);
return editable ? (
<span>
<EditableContext.Consumer>
{(form) => (
<a onClick={() => this.saveData(form, record.username)} style={{ marginRight: 8 }}>
Save
</a>
)}
</EditableContext.Consumer>
<a onClick={this.cancel}>Cancel</a>
</span>
) : (
<Space size='middle'>
<a onClick={() => this.edit(record.username)}>Edit</a>
<Popconfirm title='Are you sure you want to delete this product?' onConfirm={() => this.remove(record.username)}>
<a style={{ color: 'red' }}>Delete</a>
</Popconfirm>
</Space>
);
}
};
}
When you click on edit, you set the username as key for that particular row for editing, make sure you have username in each record. I tested this using the following data:
const data = [
{ id: 8, name: 'baun', model: '2022', color: 'black', price: 358, quantity: 3, username: 'brvim' },
{ id: 3, name: 'galileo', model: '20221', color: 'white', price: 427, quantity: 7, username: 'john' }
];
Most important, you should select that attribute as key that is unique in all records. As you are using username, i don't know what is your business logic or data looks like, but technically each record can have same username. So you must select something that would always be unique in your complete data.

Google Maps JavaScript API library must be loaded - convert solution for react functional component

This solution (below) was given and fixes the problem of checking PlacesAutocomplete is loaded first before trying to load it and causing an error(within a class component), but I'm struggling to convert it to use in a functional component with react hooks as I can't access window.initMap.
state = {
gmapsLoaded: false,
}
initMap = () => {
this.setState({
gmapsLoaded: true,
})
}
componentDidMount () {
window.initMap = this.initMap
const gmapScriptEl = document.createElement(`script`)
gmapScriptEl.src = `https://maps.googleapis.com/maps/api/js?key=SECRET_EATING&libraries=places&callback=initMap`
document.querySelector(`body`).insertAdjacentElement(`beforeend`, gmapScriptEl)
}
render () {
return (
<div>
{this.state.gmapsLoaded && (
<PlacesAutocomplete />
)}
</div>
)
}
was trying:
const [gmapsLoaded,setgmapsLoaded ] = useState(false)
initMap = () => {
setgmapsLoaded(true)
}
useEffect(() => {
window.initMap = this.initMap
const gmapScriptEl = document.createElement(`script`)
gmapScriptEl.src = "https://maps.googleapis.com/maps/api/js?key=AIzaSyAmlRtE1Ggrzz-iSUAWGIcm0mmi7GXbKtI&callback=initMap"
document.querySelector(`body`).insertAdjacentElement(`beforeend`, gmapScriptEl)
});
but to no avail
I also tried this though it doesn't work, it solves it from crashing though it won't load the suggestions on the screen found inside PlacesAutoComplete and just keeps saying "Loading..."
import React, { useContext, useState , useEffect} from "react";
const initMap = () => {
setgmapsLoaded(true)
}
useEffect(() => {
if (gmapsLoaded === false) {
window.initMap = initMap
const gmapScriptEl = document.createElement(`script`)
gmapScriptEl.src = "https://maps.googleapis.com/maps/api/js?key=AIzaSyAmlRtE1Ggrzz-iSUAWGIcm0mmi7GXbKtI&callback=initMap"
document.querySelector(`body`).insertAdjacentElement(`beforeend`, gmapScriptEl)
}
});
{gmapsLoaded && (
<PlacesAutocomplete
value={address}
onChange={setAddress}
onSelect={handleSelect}
>
{({ getInputProps, suggestions, getSuggestionItemProps, loading }) => (
<div>
<p> latitude: {coordinates.lat}</p>
<p> longitude: {coordinates.lng}</p>
<p> Address: {address}</p>
<input
{...getInputProps({
placeholder: 'Search Places ...',
className: 'location-search-input',
})}
/>
<div className="autocomplete-dropdown-container">
{loading && <div>Loading...</div>}
{suggestions.map(suggestion => {
const className = suggestion.active
? 'suggestion-item--active'
: 'suggestion-item';
// inline style for demonstration purpose
const style = suggestion.active
? { backgroundColor: '#fafafa', cursor: 'pointer' }
: { backgroundColor: '#ffffff', cursor: 'pointer' };
return (
<div
{...getSuggestionItemProps(suggestion, {
className,
style,
})}
>
<span>{suggestion.description}</span>
</div>
);
})}
</div>
</div>
)}
</PlacesAutocomplete>
)
}

UseEffect does not recognize imported components and is not called first

I'm wiriting a kibana plugin and I have some problems with a flyout component. That's my starting code:
export const InputPipelineDebugger = ({queryParams, setQueryParams, setConnectionType, setMessage}) => {
const onChangeTest = (e) => {
setMessage(e.target.value);
}
const onTabConnectionTypeClicked = (tab) => {
setConnectionType(tab.id);
}
var tabsConnection = [
{
id: 'http',
name: 'HTTP',
content: <HttpInput onChangeTest = {onChangeTest} queryParams = {queryParams} setQueryParams={setQueryParams} />
},
{
id: 'syslog',
name: 'SYSLOG',
content: <SyslogInput onChangeTest = {onChangeTest} />
},
{
id: 'beats',
name: 'BEAT',
content: <BeatsInput onChangeTest = {onChangeTest} />
}
];
return (
<EuiFlexItem>
<h3>Input</h3>
<EuiTabbedContent
tabs={tabsConnection}
initialSelectedTab={tabsConnection[0]}
autoFocus="selected"
onTabClick={tab => {
onTabConnectionTypeClicked(tab);
}} />
</EuiFlexItem>
);
}
And what I want is to dynamically build the tabs array according to the response from a rest call. So I was trying to use the useEffect method and for that I change the tabsConnection with a state (and a default value, that works WITHOUT the useEffect method) but is not working at all. Console saids to me that the 'content' value from the tabs array is undefined, like if it's not recognizing the imports.
How can I achieve my goal? Thanks for the support
export const InputPipelineDebugger = ({queryParams, setQueryParams, setConnectionType, setMessage}) => {
//initialized with a default value
const [tabs, setTabs] = useState([{
id: 'syslog',
name: 'SYSLOG',
content: <SyslogInput onChangeTest = {onChangeTest} />
}]);
const onChangeTest = (e) => {
setMessage(e.target.value);
}
const onTabConnectionTypeClicked = (tab) => {
setConnectionType(tab.id);
}
useEffect(()=>{
//rest call here;
//some logics
var x = [{
id: 'beats',
name: 'BEATS',
content: <BeatsInput onChangeTest = {onChangeTest} />
}];
setTabs(x);
}, []);
return (
<EuiFlexItem>
<h3>Input</h3>
<EuiTabbedContent
tabs={tabs}
initialSelectedTab={tabs[0]}
autoFocus="selected"
onTabClick={tab => {
onTabConnectionTypeClicked(tab);
}} />
</EuiFlexItem>
);
}
Errors from the console:
Uncaught TypeError: Cannot read property 'content' of undefined
at EuiTabbedContent.render
EDIT 1
Here the code of BeatsInput and SyslogInput:
import {
EuiText,
EuiTextArea,
EuiSpacer,
EuiFlexItem,
} from '#elastic/eui';
import React, { Fragment, useState } from 'react';
export const SyslogInput = ({onChangeTest}) => {
return (
<EuiFlexItem>
<EuiFlexItem >
<EuiSpacer />
<EuiText >
<EuiTextArea fullWidth={true}
style={{ height: "450px" }}
onChange={e => onChangeTest(e)}
placeholder="Scrivi l'input"
/>
</EuiText>
</EuiFlexItem>
</EuiFlexItem>
)
}
import {
EuiText,
EuiTextArea,
EuiSpacer,
EuiFlexItem,
} from '#elastic/eui';
import React, { Fragment, useState } from 'react';
export const BeatsInput = ({onChangeTest}) => {
return (
<EuiFlexItem>
<EuiFlexItem >
<EuiSpacer />
<EuiText >
<EuiTextArea fullWidth={true}
style={{ height: "450px" }}
onChange={e => onChangeTest(e)}
placeholder="Scrivi l'input"
/>
</EuiText>
</EuiFlexItem>
</EuiFlexItem>
)
}
Change initialSelectedTab to selectedTab [or just add it in addition to]
https://elastic.github.io/eui/#/navigation/tabs
You can also use the selectedTab and
onTabClick props to take complete control over tab selection. This can
be useful if you want to change tabs based on user interaction with
another part of the UI.
Or work around:
give tabs an empty default value
const [tabs, setTabs] = useState();
render the component conditionally around tabs
{tabs && (
<EuiTabbedContent
tabs={tabs}
initialSelectedTab={tabs[0]}
autoFocus="selected"
onTabClick={tab => {
onTabConnectionTypeClicked(tab);
}}
/>
)}

Fetching query in method of a class component

Apollo client (2.6.3) with react.
Is it possible to fetch data in a method of a class component?
I'm building a global search component and I want to fetch data only when 3rd (and each subsequent) character is typed. Right now it is implemented with fetch api but I want to switch to apollo client and graphql api.
Until this moment I haven't gotten any problems with apollo client API cause I use
<Query/> component.
I've tried to use new hooks api but it turned out that useLazyQuery() can be used only in a function component (rules of hooks).
This is what I have done so far. I know that component is messy and I'm open to suggestions. This is my first react app.
import React, { Component } from "react";
import PropTypes from "prop-types";
import { Select, Icon, Button } from "antd";
import { es } from "../../../utils/queries";
import { useLazyQuery } from "#apollo/react-hooks";
const { Option, OptGroup } = Select;
class GlobalSearch extends Component {
constructor(props) {
super(props);
this.searchInput = React.createRef();
}
state = {
data: [],
value: undefined,
display: false
};
componentDidMount() {
document.addEventListener("click", this.onClickOutside);
}
generateOptions(data) {
return data.map(d => {
if (d._index === "cases") {
d.label = (
<div>
<Icon style={{ fontSize: "18px" }} type="tool" />
<span style={{ color: "#183247" }}>
{d._source.number + d._source.serialNumber}
</span>
</div>
);
} else if (d._index === "items") {
d.label = (
<div>
<Icon style={{ fontSize: "18px" }} type="barcode-o" />
<span style={{ color: "#183247" }}>{d._source.name}</span>
</div>
);
} else if (d._index === "people") {
d.label = (
<div>
<Icon
type="user"
style={{ fontSize: "18px", float: "left", marginTop: "3px" }}
/>
<div style={{ marginLeft: "26px" }}>
<span style={{ color: "#183247" }}>
{" "}
<div>{d._source.name + " " + d._source.surname}</div>
</span>
<div>{d._source.email}</div>
</div>
</div>
);
} else if (d._index === "counterparties") {
d.label = (
<div>
<Icon style={{ fontSize: "18px" }} type="shop" />
<span style={{ color: "#183247" }}>{d._source.name}</span>
</div>
);
} else {
d.label = "undefined";
}
return d;
});
}
//group data according to type of the search result (index e.g. cases, items, contacts)
setData = es_data => {
const data = {};
const map = new Map();
for (const item of es_data) {
if (!map.has(item._index)) {
map.set(item._index);
data[item._index] = [];
}
data[item._index].push(item);
}
this.setState({ data: data });
};
handleSearch = value => {
if (value.length > 2) {
//tutaj wyszukujemy dane na serwerze a wyniki callbackiem przesyƂamy do state.data[]
//response.json() calls mixin methods from body
const host = window.location.hostname
// const { loading, data } = useLazyQuery(es(value));
// if (loading) return undefined;
// if (data) {
// this.setData(this.generateOptions(data));
// }
fetch(`http://${host}:3000/api/es?searchString=${value}`)
.then(response => response.json())
.then(es_data => {
this.setData(this.generateOptions(es_data));
});
}
};
handleChange = value => {
//przy kazdym wpisanym znaku aktualizuj wartosc pola
this.setState({ value });
};
handleSelect = (key, option) => {
console.log(key);
console.log(option);
};
handleBlur = e => {
this.setState({ display: false, value: undefined, data: [] });
};
onClick = () => {
this.setState({ display: !this.state.display });
};
getSearchField(options) {
if (this.state.display) {
return (
<Select
id="global-search-field"
optionLabelProp="label"
showSearch
value={this.state.value}
placeholder={"search..."}
style={{ display: this.state.display, width: "350px" }}
defaultActiveFirstOption={true}
showArrow={false}
filterOption={false}
onSearch={this.handleSearch}
onChange={this.handleChange}
onSelect={this.handleSelect}
notFoundContent={"nothing here..."}
onBlur={this.handleBlur}
autoFocus={true}
showAction={["focus"]}
dropdownClassName="global-search-dropdown"
>
{options}
</Select>
);
}
}
render() {
//generate options for each group (index)
const options = Object.keys(this.state.data).map(d => (
<OptGroup label={d}>
{this.state.data[d].map(d => (
<Option
className={d._index}
type={d._index}
key={d._id}
label={d.label}
>
<div>{d.label}</div>
</Option>
))}
</OptGroup>
));
return (
<span>
{this.getSearchField(options)}
<Button
id="global-search"
shape="circle"
icon="search"
onClick={this.onClick}
/>
</span>
);
}
}
export default GlobalSearch;
Apollo Client offers a Promise-based API that provides more imperative control over when/where your queries/mutations are run. Here's an example from their docs:
client
.query({
query: gql`
query GetLaunch {
launch(id: 56) {
id
mission {
name
}
}
}
`,
variables: { ... }
})
.then(result => console.log(result));
You can import your client and use this pattern in any method or function like any other async operation using Promises.

Axios get method response in React cannot be displayed getting data from firebase as an array in my blog application

I wonder if someone could help me. I have read many StackOverflow's answers around this and other great articles like this one and I couldn't implement an answer yet.
I have got a simple blog app in React. I have a form to submit the data and I have separate post and posts component as well. I can actually send data to my firebase database. I also get the response in GET method but I cannot show the response as I need it to be. I need an array of posts which each post has a title and content so that I can send its data to my Post component. But I always get an error like( map cannot be used on the response) and I actually cannot get an array out of my database. I even wonder if I am sending data in the right format. Please check my code below and help me out. Thanks.
// The individual post component
const Post = props => (
<article className="post">
<h2 className="post-title">{props.title}</h2>
<hr />
<p className="post-content">{props.content}</p>
</article>
);
// The form component to be written later
class Forms extends React.Component {}
// The posts loop component
class Posts extends React.Component {
state = {
posts: null,
post: {
title: "",
content: ""
}
// error:false
};
componentDidMount() {
// const posts = this.state.posts;
axios
.get("firebaseURL/posts.json")
.then(response => {
const updatedPosts = response.data;
// const updatedPosts = Array.from(response.data).map(post => {
// return{
// ...post
// }
// });
this.setState({ posts: updatedPosts });
console.log(response.data);
console.log(updatedPosts);
});
}
handleChange = event => {
const name = event.target.name;
const value = event.target.value;
const { post } = this.state;
const newPost = {
...post,
[name]: value
};
this.setState({ post: newPost });
console.log(event.target.value);
console.log(this.state.post.title);
console.log(name);
};
handleSubmit = event => {
event.preventDefault();
const post = {
post: this.state.post
};
const posts = this.state.posts;
axios
.post("firebaseURL/posts.json", post)
.then(response => {
console.log(response);
this.setState({ post: response.data });
});
};
render() {
let posts = <p>No posts yet</p>;
if (this.state.posts) {
posts = this.state.posts.map(post => {
return <Post key={post.id} {...post} />;
});
}
return (
<React.Fragment>
<form className="new-post-form" onSubmit={this.handleSubmit}>
<label>
Post title
<input
className="title-input"
type="text"
name="title"
onChange={this.handleChange}
/>
</label>
<label>
Post content
<input
className="content-input"
type="text"
name="content"
onChange={this.handleChange}
/>
</label>
<input className="submit-button" type="submit" value="submit" />
</form>
</React.Fragment>
);
}
}
class App extends React.Component {
render() {
return (
<React.Fragment>
<Posts />
</React.Fragment>
);
}
}
// Render method to run the app
ReactDOM.render(<App />, document.getElementById("id"));
And this is a screenshot of my firebase database:
My Firebase database structure
It is interesting that what I found is rarely mentioned anywhere around it.
This is the entire Posts component:
class Posts extends React.Component {
state = {
posts: [],
post: {
title: "",
content: ""
}
};
componentWillMount() {
const { posts } = this.state;
axios
.get("firebaseURL/posts.json")
.then(response => {
const data = Object.values(response.data);
this.setState({ posts : data });
});
}
handleChange = event => {
const name = event.target.name;
const value = event.target.value;
const { post } = this.state;
const newPost = {
...post,
[name]: value
};
this.setState({ post: newPost });
console.log(event.target.value);
console.log(this.state.post.title);
console.log(name);
};
handleSubmit = event => {
event.preventDefault();
const {post} = this.state;
const {posts} = this.state;
axios
.post("firebaseURL/posts.json", post)
.then(response => {
console.log(response);
const newPost = response.data;
this.setState({ post: response.data });
});
};
render() {
let posts = <p>No posts yet</p>;
if (this.state.posts) {
posts = this.state.posts.map(post => {
return <Post key={post.id} {...post} />;
});
}
return (
<React.Fragment>
{posts}
<form className="new-post-form" onSubmit={this.handleSubmit}>
<label>
Post title
<input
className="title-input"
type="text"
name="title"
onChange={this.handleChange}
/>
</label>
<label>
Post content
<input
className="content-input"
type="text"
name="content"
onChange={this.handleChange}
/>
</label>
<input className="submit-button" type="submit" value="submit" />
</form>
</React.Fragment>
);
}
}
Actually as I first time read in this question you should not rely on console.log to see if your posts (or your response data) has been updated. Because in componentDidMount() when you immediately update state you will not see the change in console. So what I did was to display the data that I got from the response using map over the posts and it showed my items as I actually had an array although couldn't see in the console. This is my code for componentDidMount:
axios.get("firebaseURL/posts.json").then(response => {
const data = Object.values(response.data);
this.setState({
posts: data
});
And show the posts:
let posts = <p>No posts yet</p>;
if (this.state.posts) {
posts = this.state.posts.map(post => {
return <Post key={post.id} {...post} />;
});
}
And it shows all the posts as expected. Take away is to be careful once woking on componentDidMound and other lifecycle methods as you might not see the updated data in the console inside them but you actually need to use it as it is in the response. The state is updated but you are not able to see it inside that method.
Not a database expert, but I believe your database is structured a bit odd and will only cause problems further down the line, especially when it comes to editing/updating a single post. Ideally, it should structured like a JSON array:
posts: [
{
id: "LNO_qS0Y9PjIzGds5PW",
title: "Example title",
content: "This is just a test"
},
{
id: "LNOc1vnvA57AB4HkW_i",
title: "Example title",
content: "This is just a test"
},
...etc
]
instead its structured like a JSON object:
"posts": {
"LNO_qS0Y9PjIzGds5PW": {
"post": {
"title": "Example title",
"content": "This is just a test"
}
},
"LNOc1vnvA57AB4HkW_i": {
"post": {
"title": "Example title",
"content": "This is just a test"
}
},
...etc
}
Anyway, your project should have a parent Posts container-component that controls all your state and fetching of data, then it passes down its state and class methods to component children. Then the children can update or display the parent's state accordingly.
OR
You should separate your Posts container-component, so that it either displays found posts or a "No posts found" component. And then, have your Posts Form component be it's own/unshared component whose only function is to show a form and submit it to a DB.
Up to you and what you think fits your needs.
Working example: https://codesandbox.io/s/4x4kxn9qxw (the example below has one container-component that shares with many children)
Note: If you change posts to an empty array [], instead of data in fetchData()s this.setState() function, you can have the PostForm be displayed under the /posts route!
ex: .then(({ data }) => this.setState({ isLoading: false, posts: [] }))
index.js
import React from "react";
import { render } from "react-dom";
import App from "./routes";
import "uikit/dist/css/uikit.min.css";
import "./styles.css";
render(<App />, document.getElementById("root"));
routes/index.js
import React from "react";
import { BrowserRouter, Switch, Route } from "react-router-dom";
import Home from "../components/Home";
import Header from "../components/Header";
import Posts from "../containers/Posts";
export default () => (
<BrowserRouter>
<div>
<Header />
<Switch>
<Route exact path="/" component={Home} />
<Route path="/posts" component={Posts} />
<Route path="/postsform" component={Posts} />
</Switch>
</div>
</BrowserRouter>
);
containers/Posts.js
import isEmpty from "lodash/isEmpty";
import React, { Component } from "react";
import axios from "axios";
import PostsForm from "../components/postsForm";
import ServerError from "../components/serverError";
import ShowPosts from "../components/showPosts";
import Spinner from "../components/spinner";
export default class Posts extends Component {
state = {
content: "",
error: "",
isLoading: true,
posts: [],
title: ""
};
componentDidUpdate = (prevProps, prevState) => {
// check if URL has changed from "/posts" to "/postsform" or vice-versa
if (this.props.location.pathname !== prevProps.location.pathname) {
// if so, check the location
this.setState({ isLoading: true }, () => this.checkLocation());
}
};
componentDidMount = () => this.checkLocation();
checkLocation = () => {
// if the location is "/posts" ...
this.props.location.pathname === "/posts"
? this.fetchData() // then fetch data
: this.setState({ // otherwise, clear state
content: "",
error: "",
isLoading: false,
posts: [],
title: ""
});
};
// fetches posts from DB and stores it in React state
fetchData = () => {
axios
.get("firebaseURL/posts.json")
.then(({ data }) => this.setState({ isLoading: false, posts: data }))
.catch(err => this.setState({ error: err.toString() }));
};
// handles postsForm input changes { content: value , title: value }
handleChange = e => this.setState({ [e.target.name]: e.target.value });
// handles postsForm form submission
handleSubmit = event => {
event.preventDefault();
const { content, title } = this.state;
alert(`Sumbitted values: ${title} - ${content}`);
/* axios.post("firebaseURL/posts.json", { post: { title, content }})
.then(({data}) => this.setState({ content: "", posts: data, title: "" }))
.catch(err => this.setState({ error: err.toString() }))
*/
};
// the below simply returns an if/else chain using the ternary operator
render = () => (
this.state.isLoading // if isLoading is true...
? <Spinner /> // show a spinner
: this.state.error // otherwise if there's a server error...
? <ServerError {...this.state} /> // show the error
: isEmpty(this.state.posts) // otherwise, if posts array is still empty..
? <PostsForm // show the postForm
{...this.state}
handleChange={this.handleChange}
handleSubmit={this.handleSubmit}
/>
: <ShowPosts {...this.state} /> // otherwise, display found posts!
);
}
components/postsForm.js
import React from "react";
export default ({ content, handleSubmit, handleChange, title }) => (
<form
style={{ padding: "0 30px", width: 500 }}
className="new-post-form"
onSubmit={handleSubmit}
>
<label>
Post title
<input
style={{ marginBottom: 20 }}
className="uk-input"
type="text"
name="title"
onChange={handleChange}
placeholder="Enter post title..."
value={title}
/>
</label>
<label>
Post content
<input
style={{ marginBottom: 20 }}
className="uk-input"
type="text"
name="content"
onChange={handleChange}
placeholder="Enter post..."
value={content}
/>
</label>
<button
disabled={!title || !content}
className="uk-button uk-button-primary"
type="submit"
>
Submit
</button>
</form>
);
components/showPosts.js
import map from "lodash/map";
import React from "react";
export default ({ posts }) => (
<div className="posts">
{map(posts, ({ post: { content, title } }, key) => (
<div key={key} className="post">
<h2 className="post-title">{title}</h2>
<hr />
<p className="post-content">{content}</p>
</div>
))}
</div>
);
components/serverError.js
import React from "react";
export default ({ err }) => (
<div style={{ color: "red", padding: 20 }}>
<i style={{ marginRight: 5 }} className="fas fa-exclamation-circle" /> {err}
</div>
);

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