Get image preview before uploading in React

Question

Many examples of this on here but can\'t seem to find any for react. I have managed to convert the vanilla js to react but getting an error.

The answer looks simple

Answer 1

No difference, just read your image when the load event finishes. After the load end event handler just set your state:

getInitialState: function(){
  return{file: []}
}

_onChange: function(){
  // Assuming only image
  var file = this.refs.file.files[0];
  var reader = new FileReader();
  var url = reader.readAsDataURL(file);

   reader.onloadend = function (e) {
      this.setState({
          imgSrc: [reader.result];
      })
    }.bind(this);
  console.log(url) // Would see a path?
  // TODO: concat files
},

render: function(){
 return(
  

    

      
     
    {/* Only show first image, for now. */}
    
  
 )
}