Hur läser man en lokal textfil med JavaScript?

Hur läser man en lokal textfil med JavaScript?

Föreställ dig att din webbsida vill interagera med filer på användarens dator. HTML 5 tillhandahåller ett praktiskt verktyg som kallas File API för att göra detta möjligt. File API tillåter interaktion med enstaka, flera samt BLOB-filer.

FileReader API kan användas för att läsa en fil asynkront i samarbete med JavaScript händelsehantering. Alla webbläsare har dock inte HTML 5-stöd så det är viktigt att testa webbläsarkompatibiliteten innan du använder File API.

Det finns fyra inbyggda metoder i FileReader API för att läsa lokala filer:

  • FileReader.readAsArrayBuffer(): Läser innehållet i den angivna indatafilen. Resultatattributet innehåller en ArrayBuffer som representerar filens data.
  • FileReader.readAsBinaryString(): Läser innehållet i den angivna indatafilen. Resultatattributet innehåller den råa binära data från filen som en sträng.
  • FileReader.readAsDataURL(): Läser innehållet i den angivna indatafilen. Resultatattributet innehåller en URL som representerar filens data.
  • FileReader.readAsText(): Läser innehållet i den angivna indatafilen. Resultatattributet innehåller innehållet i filen som en textsträng. Denna metod kan ta kodningsversionen som det andra argumentet (om det behövs). Standardkodningen är UTF-8.

Olika exempel på läs lokala textfiler med JavaScript:

Exempel 1: För att demonstrera hur man använder metoden FileReader.readAsText() för att läsa den lokala filen.

HTML
      Läs textfiltitel> huvud> <body>  <input type='file' name='inputfile' id='inputfile'>  <br>  <pre id='output'>före> <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>Exempel 2: </strong>  </b>  <span>För att demonstrera hur man använder metoden FileReader.readAsBinaryString() för att läsa den lokala filen. </span> </p>HTML <code>  <pre>  <html>  <head>  <title>Läs textfiltitel> huvud> <body>  <input type='file' name='inputfile' id='inputfile'>  <br>  <pre id='output'>före> <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='prov15'> <p>Produktion </p>  <p dir='ltr'> <span>JavaScript är mest känt för webbsidautveckling men det används också i en mängd olika miljöer utan webbläsare. Du kan lära dig JavaScript från grunden genom att följa detta </span>  <span>JavaScript handledning </span>  <span>och </span>  <span>JavaScript-exempel </span>  <span>. </span> </p>  <br>  <br>
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