Hvordan lese en lokal tekstfil ved hjelp av JavaScript?
Tenk deg at nettsiden din ønsker å samhandle med filer på brukerens datamaskin. HTML 5 gir et hendig verktøy kalt File API for å gjøre dette mulig. File API tillater interaksjon med enkelt-, flere- og BLOB-filer.
FileReader API kan brukes til å lese en fil asynkront i samarbeid med JavaScript hendelseshåndtering. Alle nettleserne har imidlertid ikke HTML 5-støtte, så det er viktig å teste nettleserkompatibiliteten før du bruker File API.
Det er fire innebygde metoder i FileReader API for å lese lokale filer:
- FileReader.readAsArrayBuffer(): Leser innholdet i den angitte inndatafilen. Resultatattributtet inneholder en ArrayBuffer som representerer filens data.
- FileReader.readAsBinaryString(): Leser innholdet i den angitte inndatafilen. Resultatattributtet inneholder de rå binære dataene fra filen som en streng.
- FileReader.readAsDataURL(): Leser innholdet i den angitte inndatafilen. Resultatattributtet inneholder en URL som representerer filens data.
- FileReader.readAsText(): Leser innholdet i den angitte inndatafilen. Resultatattributtet inneholder innholdet i filen som en tekststreng. Denne metoden kan ta kodingsversjonen som det andre argumentet (hvis nødvendig). Standardkodingen er UTF-8.
Ulike eksempler på les lokale tekstfiler ved hjelp av JavaScript:
Eksempel 1: For å demonstrere bruk av FileReader.readAsText()-metoden for å lese den lokale filen.
HTML Les tekstfiltittel> hode> <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>Produksjon: </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 å demonstrere bruk av FileReader.readAsBinaryString()-metoden for å lese den lokale filen. </span> </p>HTML <code> <pre> <html> <head> <title>Les tekstfiltittel> hode> <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>Produksjon: </strong> </b> </p> <img src='//techcodeview.com/img/javascript-questions/25/how-read-local-text-file-using-javascript-2.webp' alt='prøve15'> <p>Produksjon </p> <p dir='ltr'> <span>JavaScript er mest kjent for utvikling av nettsider, men det brukes også i en rekke miljøer uten nettleser. Du kan lære JavaScript fra grunnen av ved å følge dette </span> <span>JavaScript veiledning </span> <span>og </span> <span>JavaScript-eksempler </span> <span>. </span> </p> <br> <br>
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