Jak odczytać lokalny plik tekstowy za pomocą JavaScript?
Wyobraź sobie, że Twoja strona internetowa chce wchodzić w interakcję z plikami na komputerze użytkownika. HTML5 udostępnia przydatne narzędzie o nazwie File API, które to umożliwia. Interfejs API plików umożliwia interakcję z plikami pojedynczymi, wieloma i BLOB.
Interfejs API FileReader może być używany do asynchronicznego odczytu pliku we współpracy z JavaScript Obsługa zdarzeń. Jednak nie wszystkie przeglądarki obsługują HTML 5, dlatego ważne jest przetestowanie kompatybilności przeglądarki przed użyciem interfejsu File API.
Istnieją cztery wbudowane metody w interfejsie API FileReader do odczytywania plików lokalnych:
- FileReader.readAsArrayBuffer(): Odczytuje zawartość określonego pliku wejściowego. Atrybut wyniku zawiera ArrayBuffer reprezentujący dane pliku.
- FileReader.readAsBinaryString(): Odczytuje zawartość określonego pliku wejściowego. Atrybut wyniku zawiera nieprzetworzone dane binarne z pliku w postaci ciągu znaków.
- FileReader.readAsDataURL(): Odczytuje zawartość określonego pliku wejściowego. Atrybut wyniku zawiera adres URL reprezentujący dane pliku.
- FileReader.readAsText(): Odczytuje zawartość określonego pliku wejściowego. Atrybut wyniku zawiera zawartość pliku w postaci ciągu tekstowego. Ta metoda może przyjąć wersję kodowania jako drugi argument (jeśli jest to wymagane). Domyślne kodowanie to UTF-8.
Różne przykłady odczytu lokalnych plików tekstowych przy użyciu JavaScript:
Przykład 1: Aby zademonstrować użycie metody FileReader.readAsText() do odczytu pliku lokalnego.
HTML Przeczytaj tytuł pliku tekstowego> head> <body> <input type='file' name='inputfile' id='inputfile'> <br> <pre id='output'>przed> <script type='text/javascript'>document.getElementById('inputfile') .addEventListener('change', funkcja () { niech fr = nowy FileReader(); fr.onload = funkcja () { document.getElementById('output') . textContent = fr.result; } fr.readAsText(this.files[0] }) skrypt> treść> html> </pre> </code> <p dir='ltr'> <b> <strong>Wyjście: </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>Przykład 2: </strong> </b> <span>Aby zademonstrować użycie metody FileReader.readAsBinaryString() do odczytu pliku lokalnego. </span> </p>HTML <code> <pre> <html> <head> <title>Przeczytaj tytuł pliku tekstowego> head> <body> <input type='file' name='inputfile' id='inputfile'> <br> <pre id='output'>przed> <script type='text/javascript'>document.getElementById('inputfile') .addEventListener('change', funkcja () { niech fr = nowy FileReader(); fr.onload = funkcja () { document.getElementById('output') . textContent = fr.result; } fr.readAsBinaryString(this.files[0]); }) skrypt> treść> html> </pre> </code> <p dir='ltr'> <b> <strong>Wyjście: </strong> </b> </p> <img src='//techcodeview.com/img/javascript-questions/25/how-read-local-text-file-using-javascript-2.webp' alt='próbka15'> <p>Wyjście </p> <p dir='ltr'> <span>JavaScript jest najbardziej znany z tworzenia stron internetowych, ale jest również używany w różnych środowiskach innych niż przeglądarka. Postępując zgodnie z poniższymi wskazówkami, możesz nauczyć się języka JavaScript od podstaw </span> <span>Samouczek JavaScript </span> <span>I </span> <span>Przykłady JavaScriptu </span> <span>. </span> </p> <br> <br>
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