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PHP React form formData 10: input text using ajax (fetch)

Falah Al Fitri
I am Developer
・2 min read

Happy Coding

Right now, PHP and React, the series ..

Add external script in head tag.
First and second for react, and third for babel.

<head>

    <script src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
    <script src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>

    <script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>

</head>

In body, add div tag with id="myApp" for render DOM React

    <div id="myApp" ></div>

Script React

    <script type="text/babel">

        class App extends React.Component
        {

            constructor(props)
            {

                super(props);

                this.state = {
                    result: {}
                };

                this.handleChange = this.handleChange.bind(this);
                this.handleSubmit = this.handleSubmit.bind(this);

            }

            handleChange(event)
            {

                const target    = event.target;

                const name      = target.name;
                const value     = target.value;

                this.setState({
                    [name]: value
                });

            }

submit function with (this) object of form

            handleSubmit(event)
            {

                event.preventDefault();


                var formHTML = event.target;

                console.log( formHTML ); // formHTML element


                // https://developer.mozilla.org/en-US/docs/Web/API/FormData/Using_FormData_Objects
                var formData = new FormData( formHTML );

                console.log( formData );


                // https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch

                /* AJAX request */
                this.ajax( formHTML, formData ); // ajax( form, data, destination = null )

            }

This, ajax fetch (promise)

            ajax( form, data, destination = null )
            {

                fetch( form.action, {

                    method: form.method, // *GET, POST, PUT, DELETE, etc.
                    mode: 'cors', // no-cors, *cors, same-origin
                    cache: 'no-cache', // *default, no-cache, reload, force-cache, only-if-cached
                    credentials: 'same-origin', // include, *same-origin, omit

                    headers: {
                        // 'Content-Type': 'application/json'
                        // 'Content-Type': 'application/x-www-form-urlencoded',
                        // "Content-Type": "multipart/form-data" // missing boundary
                    },

                    redirect: 'follow', // manual, *follow, error
                    referrer: 'no-referrer', // no-referrer, *client

                    body: data // body data type must match "Content-Type" header

                } )

                /* handle return result */
                .then( response => {

                    if ( ! response.ok )
                    {
                        throw new Error(response.statusText);
                    }

                    return response.json();

                } )

                /* handle success */
                .then( result => {

                    console.log( result );

                    this.setState( {result: result} );

                } )

                /* handle error */
                .catch( error => {

                    console.error(error);

                } );

            }

render it

            render() {

                return (

                    <div>

This, Form HTML rendering

                        <form method="post" action="process.php" onSubmit={this.handleSubmit} >

                            Firstname: <input type="text" name="firstname" onChange={this.handleChange} />
                            <br />

                            Lastname: <input type="text" name="lastname" onChange={this.handleChange} />
                            <br />

                            <hr />

                            <input type="submit" name="submit" value="Submit" />

                        </form>

and get input data into p tag

                        <h3>Model</h3>

                        <p>Firstname: { this.state.firstname }</p>
                        <p>Lastname: { this.state.lastname }</p>

                        <hr /><br />


                        <h3>Result from server PHP</h3>

                        <pre>Submit Result: { JSON.stringify(this.state.result) }</pre>

                    </div>

                );

            }

        }

        ReactDOM.render( <App />, document.querySelector('#myApp') )

    </script>

process.php

echo json_encode($_POST);

Last, don't forget press F12


Demo repl.it


Thank for reading :)

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