[BUG] getMaxPageCount with useState

[simon-baehler]

Hello,

I'm trying to set the number of pages using useState, but unfortunately, it's crashing.

Describe the bug I'm trying to use getMaxPageCount with useState

const [pages, setPages] = useState(0);
 <PDFViewer
    externalInput={true}
    document={{
        url: link,
    }}
    canvasCss='customCanvas'
    css='wrapperPDF'
    page={currentPage}
    getMaxPageCount={(pageCount) => setPages(pageCount)}
/>

but I've got this error on the console

react_devtools_backend.js:2430 Error while reading the pages ! TypeError: Cannot read property 'getPage' of null

Expected behavior the value of pages should best st to the number of pages

What will be awesome is to have a prop like onLoaded that takes a function how to allow us to do some stuff when the pdf was loaded whit success

Have a nice day, thank you for your help

[ansu5555]

You have to call setPages after the PDFViewer component is mounted else it is rendering again while its getting rendered and throwing the error. Use it like below

import React, { useState, useEffect } from 'react' import PDFViewer from 'pdf-viewer-reactjs'

function App() {
  let pg = 0
  const [pages, setPages] = useState(0)

  useEffect(() => {
    setPages(pg)
  }, [pg])

  return (
    <>
      <PDFViewer
        externalInput={true}
        document={{
          url: link,
        }}
        canvasCss='customCanvas'
        css='wrapperPDF'
        page={currentPage}
        getMaxPageCount={(pageCount) => (pg = pageCount)}
      />

      <h1>{pages}</h1>
    </>
  )
}

export default App

[devkf]

Thanks for your answer

Not working for me :)

[simon-baehler]

Same, not working for me ;(

[devkf]

you can used this https://github.com/MGrin/mgr-pdf-viewer-react