Javascript nfileInput.current.click（）。我尝试使用if语句仅在fileInput.current！==null但我仍然收到错误。有什么想法吗？ React.createElement('input',{type:'file', name:'m

n

fileInput.current.click（）

。我尝试使用if语句仅在

fileInput.current！==null

但我仍然收到错误。有什么想法吗？

React.createElement('input',{type:'file', name:'myfile'})

React.createElement('a',{onClick: this.doClick},'Select File')

this.doClick: function() {
    $('input[type=file]').trigger('click');
}

React.createElement('input',{type:'file', name:'myfile', id:'myfile'})

React.createElement('a',{onClick: this.doClick},'Select File')

React.createElement('label',{htmlFor: 'myfile'},'Select File')

<input 
    ref={fileInput => this.fileInput = fileInput} 
    type="file"
 />
<button onClick={this.triggerInputFile}> Select File </button>

triggerInputFile = () => this.fileInput.click()

const Dummy = () => {
  const inputFileRef = useRef( null );

  const onFilechange = ( e ) => {
    /*Selected files data can be collected here.*/
    console.log( e.target.files );
  }
  const onBtnClick = () => {
    /*Collecting node-element and performing click*/
    inputFileRef.current.click();
  }

  return (
    <form className="some-container">
      <input
        type="file"
        ref={inputFileRef}
        onChange={onFileChange}
      />
      <button onClick={onBtnClick}>Select file</button>
    </form>
  )
}

class Dummy extends React.Component {
    
  constructor( props ) {
    super( props );

    this.inputFileRef = React.createRef();
    this.onFileChange = this.handleFileChange.bind( this );
    this.onBtnClick = this.handleBtnClick.bind( this );
  }

  handleFileChange( e ) {
    /*Selected files data can be collected here.*/
    console.log( e.target.files );
  }

  handleBtnClick() {
    /*Collecting node-element and performing click*/
    this.inputFileRef.current.click();
  }

  render() {
    return (
      <form className="some-container">
        <input
          type="file"
          ref={this.inputFileRef}
          onChange={this.onFileChange}
        />
        <button onClick={this.onBtnClick}>Select file</button>
      </form>
    )
  }
}

import React, {useRef} from 'react';
const FancyInput = () => {
    const fileInput = useRef(null)

    const handleClick = () => {
        fileInput.current.click()
    }

    const handleFileChange = event => {
        console.log("Make something")
    }

    return(
        <div className="patientactions-container">
            <input
                type="file"
                onChange={(e) => handleFileChange(e)}
                ref={fileInput} 
            />
            <div onClick={() => handleClick()}></div>
        </div>
    )
}
export default FancyInput;

class Dummy extends React.Component {
    fileInputRef: React.RefObject<HTMLInputElement> = React.createRef();

    forwardClickToInputElement = () => {
        this.fileInputRef.current!.click();
    };

    handleUploadDemand = (ie: ChangeEvent<HTMLInputElement>) => {
        const fileList: FileList = ie.target.files;

        // do something with the FileList, for example:
        const fileReader = new FileReader();
        fileReader.onload = () => {
            const str = String(fileReader.result);
            try {
                const parsedContent = YOUR_OWN_PARSING(str);
            } catch (error) {
                // YOUR OWN ERROR HANDLING
            }
        };
        fileReader.readAsBinaryString(fileList[0])
    }

    render() {
        return (
            <div className="some-container">
                <button onClick={this.forwardClickToInputElement}>Select File</button>
                <input ref={this.fileInputRef} type="file" onChange={this.handleSelectFile} hidden={true}/>
            </div>
        )
    }
}