Make your textview just adding this
***TextView textview= (TextView) findViewById(R.id.your_textview_id);
textview.setMovementMethod(new ScrollingMovementMethod());***

Simply install *rxjs-compat* to solve the problem
***npm i rxjs-compat --save-dev***
And import it like below
***import 'rxjs/Rx';***

Try not closing the connection before you send data to your database. Remove **client.close()**; from your code and it'll work fine.

It is much simpler, no need for anything additional. In my example I declare variable "open" and then use it.
***



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***

You can also use **scrollIntoView** method to scroll to a given element.
***handleScrollToElement(event) {
const tesNode = ReactDOM.findDOMNode(this.refs.test)
if (some_logic){
tesNode.scrollIntoView();
}
}

render() {
return (
)
}***

*To pass data from child component to parent component*
In Parent Component:
***getData(val){
// do not forget to bind getData in constructor
console.log(val);
}
render(){
return();
}***
In Child Component:

***demoMethod(){
this.props.sendData(value);
}***

Check out **querystring**.
You can use it as follows:
***var querystring = require('querystring');
axios.post('url', querystring.stringify({ foo: 'bar' }));***

React recommends bind this in all methods that needs to use this of **class** instead this of self **function**.
***constructor(props) {
super(props)
this.onClick = this.onClick.bind(this)
}

onClick () {
this.setState({...})
}***
Or you may to use arrow function instead.

All following methods are useful:
***$('#checkbox').is(":checked")

$('#checkbox').prop('checked')

$('#checkbox')[0].checked

$('#checkbox').get(0).checked***
It is recommended that DOMelement or inline "this.checked" should be avoided instead jQuery on method should be used event listener.

Since you're using these arrows for a toggle switch you may want to consider creating these arrows with an html element using the following styles instead of unicode characters.
***.upparrow {
height: 0;
width: 0;
border: 4px solid transparent;
border-bottom-color: #000;
}

.downarrow {
height: 0;
width: 0;
border: 4px solid transparent;
border-top-color: #000;
}***

it works, all you need:

PHP:
***header('Access-Control-Allow-Origin: domain name');
header("Access-Control-Allow-Credentials: true");
header('Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS');***
JS (jQuery ajax):
***var getWBody = $.ajax({ cache: false,
url: URL,
dataType : 'json',
type: 'GET',
xhrFields: { withCredentials: true }
});***

This will also change it into an array:
*** print_r((array) json_decode($object));
?>***