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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