CODEWITHSUNDEEP
javascriptreactjs
BlueCold
BlueCold

Reputation: 173

How to read and upload a file in reactjs using custom button

I want to upload and read a file locally, but I want to do that using a custom button not using HTML input.

<input type="file" id="my_file_input" />

I found this way but I don't want to use this shape or this button, I wanted to use a material UI Raised Button to do this functionality to match the other site Button.

I also tried the following way but it didn't work because as i clicked the button nothing happened.

<input type="file" id="my_file_input" style={{display:"none"}}/>
<label htmlFor="my_file_input">
    <RaisedButton
        label="Import from Excel"
        labelColor="#FFFFFF"
        backgroundColor="#01579b"
        />
</label>

I thought I should do the uploading/reading file functionality manually in the onClick function of the RaisedButton but I didn't find a way to do that.

So is there any other solution for this problem in react?

Upvotes: 17

Views: 38540

Answers (4)

Ken
Ken

Reputation: 882

I wanted to provide an update for using refs with functional components. Here is a quick example:

Import React, {useRef} from 'React'

const myComponent = () => {
  const fileInputRef = useRef();
  
  const handleChange = (event) =>{
    // do something with event data

  }
  
  return(
    <>
      <button onClick={()=>fileInputRef.current.click()}>
        Custom File Input Button
      </button>
      <input onChange={handleChange} multiple={false} ref={fileInputRef} type='file'hidden/>
    </>
  )
}

Upvotes: 18

Raul Lea&#241;o Martinet
Raul Lea&#241;o Martinet

Reputation: 2113

As the doc says, you just need to add:

component="span"

To the button component.

Upvotes: 2

joeb
joeb

Reputation: 983

I hope this code will help you. We can solve it in two ways.

1-)

HTML

<div>
<input type="file" hidden ref={this.inputReference} onChange={this.fileUploadInputChange} />
<button className="ui button" onClick={this.fileUploadAction}>
    Image Upload
</button>
{this.state.fileUploadState}
</div>

REACT CONSTRUCTOR

constructor(props) {
    super(props);
    this.state={fileUploadState:""}
    this.inputReference = React.createRef();
}

ONCLICK FUNCTION

fileUploadAction = () =>this.inputReference.current.click();
fileUploadInputChange = (e) =>this.setState({fileUploadState:e.target.value});

2-)

HTML

<div>
<input id="fileButton" type="file" hidden />
<button onClick={this.fileUploadButton}>
    Image Upload
</button>
{this.state.fileUploadState}
</div>

React State

this.state = {fileUploadState:""}

React Function

fileUploadButton = () => {
document.getElementById('fileButton').click();
document.getElementById('fileButton').onchange = () =>{      
this.setState({
    fileUploadState:document.getElementById('fileButton').value
        });
    }
}

Upvotes: 9

shutsman
shutsman

Reputation: 2510

please read API of React Material https://material-ui.com/demos/buttons/

import React from 'react';
import PropTypes from 'prop-types';
import { withStyles } from '@material-ui/core/styles';
import Button from '@material-ui/core/Button';

const styles = theme => ({
  button: {
    margin: theme.spacing.unit,
  },
  input: {
    display: 'none',
  },
});

function ContainedButtons(props) {
  const { classes } = props;
  return (
    <div>
      <input
        accept="image/*"
        className={classes.input}
        id="contained-button-file"
        multiple
        type="file"
      />
      <label htmlFor="contained-button-file">
        <Button variant="raised" component="span" className={classes.button}>
          Upload
        </Button>
      </label>
    </div>
  );
}

ContainedButtons.propTypes = {
  classes: PropTypes.object.isRequired,
};

export default withStyles(styles)(ContainedButtons);

Upvotes: 2

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