Wie lese ich eine lokale Textdatei mit JavaScript?
Stellen Sie sich vor, Ihre Webseite möchte mit Dateien auf dem Computer des Benutzers interagieren. HTML 5 stellt ein praktisches Tool namens File API bereit, um dies zu ermöglichen. Die Datei-API ermöglicht die Interaktion mit einzelnen, mehreren sowie BLOB-Dateien.
Die FileReader-API kann zum asynchronen Lesen einer Datei in Zusammenarbeit mit verwendet werden JavaScript Handhabung des Events. Da jedoch nicht alle Browser HTML 5 unterstützen, ist es wichtig, die Browserkompatibilität zu testen, bevor Sie die Datei-API verwenden.
In der FileReader-API gibt es vier integrierte Methoden zum Lesen lokaler Dateien:
- FileReader.readAsArrayBuffer(): Liest den Inhalt der angegebenen Eingabedatei. Das Ergebnisattribut enthält einen ArrayBuffer, der die Daten der Datei darstellt.
- FileReader.readAsBinaryString(): Liest den Inhalt der angegebenen Eingabedatei. Das Ergebnisattribut enthält die rohen Binärdaten aus der Datei als Zeichenfolge.
- FileReader.readAsDataURL(): Liest den Inhalt der angegebenen Eingabedatei. Das Ergebnisattribut enthält eine URL, die die Daten der Datei darstellt.
- FileReader.readAsText(): Liest den Inhalt der angegebenen Eingabedatei. Das Ergebnisattribut enthält den Inhalt der Datei als Textzeichenfolge. Diese Methode kann die Codierungsversion als zweites Argument verwenden (falls erforderlich). Die Standardkodierung ist UTF-8.
Verschiedene Beispiele für das Lesen lokaler Textdateien mit JavaScript:
Beispiel 1: Zur Veranschaulichung der Verwendung der FileReader.readAsText()-Methode zum Lesen der lokalen Datei.
HTML Textdateititel> Kopf> lesen <body> <input type='file' name='inputfile' id='inputfile'> <br> <pre id='output'>vor> <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>Ausgabe: </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>Beispiel 2: </strong> </b> <span>Zur Veranschaulichung der Verwendung der FileReader.readAsBinaryString()-Methode zum Lesen der lokalen Datei. </span> </p>HTML <code> <pre> <html> <head> <title>Textdateititel> Kopf> lesen <body> <input type='file' name='inputfile' id='inputfile'> <br> <pre id='output'>vor> <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>Ausgabe: </strong> </b> </p> <img src='//techcodeview.com/img/javascript-questions/25/how-read-local-text-file-using-javascript-2.webp' alt='Probe15'> <p>Ausgabe </p> <p dir='ltr'> <span>JavaScript ist vor allem für die Webseitenentwicklung bekannt, wird aber auch in einer Vielzahl von Nicht-Browser-Umgebungen verwendet. Sie können JavaScript von Grund auf erlernen, indem Sie die folgenden Schritte befolgen </span> <span>JavaScript-Tutorial </span> <span>Und </span> <span>JavaScript-Beispiele </span> <span>. </span> </p> <br> <br>
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