Hvordan læser man en lokal tekstfil ved hjælp af JavaScript?

Hvordan læser man en lokal tekstfil ved hjælp af JavaScript?

Forestil dig, at din webside ønsker at interagere med filer på brugerens computer. HTML 5 giver et praktisk værktøj kaldet File API for at gøre dette muligt. File API tillader interaktion med enkelt-, multiple- og BLOB-filer.

FileReader API kan bruges til at læse en fil asynkront i samarbejde med JavaScript håndtering af begivenheder. Alle browsere har dog ikke HTML 5-understøttelse, så det er vigtigt at teste browserkompatibiliteten, før du bruger File API.

Der er fire indbyggede metoder i FileReader API til at læse lokale filer:

  • FileReader.readAsArrayBuffer(): Læser indholdet af den angivne inputfil. Resultatattributten indeholder en ArrayBuffer, der repræsenterer filens data.
  • FileReader.readAsBinaryString(): Læser indholdet af den angivne inputfil. Resultatattributten indeholder de rå binære data fra filen som en streng.
  • FileReader.readAsDataURL(): Læser indholdet af den angivne inputfil. Resultatattributten indeholder en URL, der repræsenterer filens data.
  • FileReader.readAsText(): Læser indholdet af den angivne inputfil. Resultatattributten indeholder indholdet af filen som en tekststreng. Denne metode kan tage kodningsversionen som det andet argument (hvis påkrævet). Standardkodningen er UTF-8.

Forskellige eksempler på læse lokale tekstfiler ved hjælp af JavaScript:

Eksempel 1: For at demonstrere brugen af ​​metoden FileReader.readAsText() til at læse den lokale fil.

HTML
      Læs tekstfiltitel> hoved> <body>  <input type='file' name='inputfile' id='inputfile'>  <br>  <pre id='output'>før> <script type='text/javascript'>document.getElementById('inputfile') .addEventListener('change', function () { let fr = new FileReader(); fr.onload = function () { document.getElementById('output') . textContent = fr.result; } fr.readAsText(this.files[0]) script> body> html> </pre>  </code>  <p dir='ltr'>  <b>  <strong>Produktion: </strong>  </b>  </p>  <img src='//techcodeview.com/img/javascript-questions/25/how-read-local-text-file-using-javascript.webp' alt=''> <p dir='ltr'>  <b>  <strong>Eksempel 2: </strong>  </b>  <span>For at demonstrere brugen af ​​metoden FileReader.readAsBinaryString() til at læse den lokale fil. </span> </p>HTML <code>  <pre>  <html>  <head>  <title>Læs tekstfiltitel> hoved> <body>  <input type='file' name='inputfile' id='inputfile'>  <br>  <pre id='output'>før> <script type='text/javascript'>document.getElementById('inputfile') .addEventListener('change', function () { let fr = new FileReader(); fr.onload = function () { document.getElementById('output') . textContent = fr.result; } fr.readAsBinaryString(this.files[0] }) script> body> html> </pre>  </code>  <p dir='ltr'>  <b>  <strong>Produktion: </strong>  </b>  </p>  <img src='//techcodeview.com/img/javascript-questions/25/how-read-local-text-file-using-javascript-2.webp' alt='prøve15'> <p>Produktion </p>  <p dir='ltr'> <span>JavaScript er bedst kendt for udvikling af websider, men det bruges også i en række ikke-browsermiljøer. Du kan lære JavaScript fra bunden ved at følge dette </span>  <span>JavaScript tutorial </span>  <span>og </span>  <span>JavaScript eksempler </span>  <span>. </span> </p>  <br>  <br>
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