JavaScript How to get an element By ID inside React.Fragment? object inside react component

You can use Callback Refs to retrieve the ID:

class YourComponent extends React.Component {
  constructor(props) {
    super(props)
    this.canvas = null
  }

  componentDidMount() {
    console.log(this.canvas.id) // gives you "myCanvas"
  }


  render() {
    return (
      <React.Fragment>
        <div id="animSec">
          <canvas id="myCanvas" ref={c => {this.canvas = c}}></canvas>
        </div>
      </React.Fragment>
    )
  }
}

alternatively, for React v16.3+, you can use createRef():

constructor(props) {
    super(props)
    this.canvas = React.createRef()
  }

  componentDidMount() {
    console.log(this.canvas.current.id) // gives you "myCanvas"
  }


  render() {
    return (
      <React.Fragment>
        <div id="animSec">
          <canvas id="myCanvas" ref={this.canvas}></canvas>
        </div>
      </React.Fragment>
    )
  }
Answer:1

If you set up a ref in your constructor as this.canvasRef = React.createRef() and apply it to your canvas as

<React.Fragment> 
  <div id="animSec">
    <canvas ref={this.canvasRef}></canvas>
  </div>
</React.Fragment>

You should be able to access the element directly. You can console log or check your dev tools to view the ref value. And (to my best knowledge), it's best practice to use Refs compared to querySelectors in React. You might also check out this post to see if you can work around with a method on canvas.

Answer:2

I'd like to download a protected file from my backed - I have to send authorization headers, so I can't link it directly. I have created following Ajax request to download it: Ember.$.ajax({ url:...

I'd like to download a protected file from my backed - I have to send authorization headers, so I can't link it directly. I have created following Ajax request to download it: Ember.$.ajax({ url:...

  1. javascript create blob from file
  2. javascript create blob from string
  3. javascript create blob from url
  4. javascript create blob from base64
  5. javascript create blob from pdf url
  6. javascript create blob from arraybuffer
  7. javascript create blob from image url
  8. javascript create blob from video url
  9. javascript create blob from byte array
  10. javascript create blob from pdf
  11. javascript create blob from file path
  12. javascript create blob with filename
  13. javascript create blob from image
  14. javascript create blob from response
  15. javascript create blob from json
  16. javascript create blob from uint8array
  17. javascript create blob from data url
  18. javascript create blob from binary data

I'm looking for an operator which transform the stream to the stream with history or last N events. So for a stream e.g. like this one: clicks$.subscribe((ev) => ...) I would like to have ...

I'm looking for an operator which transform the stream to the stream with history or last N events. So for a stream e.g. like this one: clicks$.subscribe((ev) => ...) I would like to have ...

  1. rxjs which operator to use
  2. rxjs which operator do i use
  3. rxjs which operator
  4. rxjs operator decision tree
  5. rxjs operator map
  6. rxjs operator tap
  7. rxjs operator do
  8. rxjs operator function
  9. rxjs operator filter
  10. rxjs operator first
  11. rxjs operator take
  12. rxjs operator delay
  13. rxjs operator pipe
  14. rxjs operator list
  15. rxjs operator switchmap
  16. rxjs operator complete
  17. rxjs operator catcherror
  18. rxjs operator timeout
  19. rxjs operator share
  20. rxjs operator merge

I have one static component and many for loop rendered components in a screen. The all code below here. import React from "react"; import { View, Text, FlatList } from "react-native"; ... class ...

I have one static component and many for loop rendered components in a screen. The all code below here. import React from "react"; import { View, Text, FlatList } from "react-native"; ... class ...

  1. flatlist scroll to top
  2. flatlist scroll to index
  3. flatlist scroll to bottom
  4. flatlist scroll to end
  5. flatlist scroll to
  6. flatlist scroll to item
  7. flatlist scroll to top react native
  8. flatlist scroll to bottom react native
  9. flatlist scroll to index example
  10. flatlist scroll to index react native
  11. flatlist scroll to end react native
  12. flatlist scroll to offset
  13. flatlist scroll to position
  14. flatlist scroll to index not working
  15. flatlist scroll to start
  16. flatlist scroll to element
  17. flatlist on scroll
  18. flatlist in scrollview

I have a basic script which shows/hides a div. I'm using this for a drop-down menu. https://www.w3schools.com/howto/howto_js_toggle_hide_show.asp I'm looking for the div element to be hidden when ...

I have a basic script which shows/hides a div. I'm using this for a drop-down menu. https://www.w3schools.com/howto/howto_js_toggle_hide_show.asp I'm looking for the div element to be hidden when ...