原文： Reading and Creating Text Files Using jQuery and HTML5 File API
The following code snippet demonstrate how to read and create a text files using the jQuery and HTML5 file API. For the sake of simplicity, in this example I am using Bootstrap CSS framework for building the page.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="description" content="Your HTML, CSS, and JavaScript playground.">
<title>HTML, CSS, JS Playground</title>
<meta content="width=device-width, initialscale=1" name="viewport">
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet">
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css" rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js" type="text/javascript"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js" type="text/javascript"></script>
<script>
$(document ).ready(function() {
//Put your java script here
});
</script>
</head>
<body>
<div class="container">
<h1>Reading and Creating Text Files Using the HTML5 File API and jQuery</h1>
<div class="form-group">
<button type="button" class="btn btn-default" id="btnOpen">Open...</button>
<button type="button" class="btn btn-default" id="btnSave">Save</button>
</div>
<input type="file" id="exampleInputFile" accept=".txt,.csv,.xml" class="hidden">
<div class="form-group">
<textarea class="form-control" rows="15" id="exampleTextarea"></textarea>
</div>
</div>
</body>
Reading text file
$('#btnOpen').click(function() {
if ('FileReader' in window) {
$('#exampleInputFile').click();
} else {
alert('Your browser does not support the HTML5 FileReader.');
}
});
$('#exampleInputFile').change(function(event) {
var fileToLoad = event.target.files[0];
if (fileToLoad) {
var reader = new FileReader();
reader.onload = function(fileLoadedEvent) {
var textFromFileLoaded = fileLoadedEvent.target.result;
console.log("loaded " + textFromFileLoaded);
$('#exampleTextarea').val(textFromFileLoaded);
};
reader.readAsText(fileToLoad, 'UTF-8');
}
});
Creating text file
$('#btnSave').click(function() {
if ('Blob' in window) {
var fileName = prompt('Please enter file name to save', 'Untitled.txt');
if (fileName) {
var textToWrite = $('#exampleTextarea').val().replace(/n/g, 'rn');
var textFileAsBlob = new Blob([textToWrite], { type: 'text/plain' });
if ('msSaveOrOpenBlob' in navigator) {
navigator.msSaveOrOpenBlob(textFileAsBlob, fileName);
} else {
var downloadLink = document.createElement('a');
downloadLink.download = fileName;
downloadLink.innerHTML = 'Download File';
if ('webkitURL' in window) {
// Chrome allows the link to be clicked without actually adding it to the DOM.
downloadLink.href = window.webkitURL.createObjectURL(textFileAsBlob);
} else {
// Firefox requires the link to be added to the DOM before it can be clicked.
downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
downloadLink.click(function(){
document.body.removeChild(event.target);
});
downloadLink.style.display = 'none';
document.body.appendChild(downloadLink);
}
downloadLink.click();
}
}
} else {
alert('Your browser does not support the HTML5 Blob.');
}
});
Comments
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