Created
December 10, 2018 21:36
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(function() { | |
// Allow for vendor prefixes. | |
window.requestFileSystem = window.requestFileSystem || | |
window.webkitRequestFileSystem; | |
// Create a variable that will store a reference to the FileSystem. | |
var filesystem = null; | |
// Get references to the page elements. | |
var form = document.getElementById('file-form'); | |
var filenameInput = document.getElementById('filename'); | |
var contentTextArea = document.getElementById('content'); | |
var fileList = document.getElementById('file-list'); | |
var messageBox = document.getElementById('messages'); | |
// A simple error handler to be used throughout this demo. | |
function errorHandler(error) { | |
var message = ''; | |
switch (error.code) { | |
case FileError.SECURITY_ERR: | |
message = 'Security Error'; | |
break; | |
case FileError.NOT_FOUND_ERR: | |
message = 'Not Found Error'; | |
break; | |
case FileError.QUOTA_EXCEEDED_ERR: | |
message = 'Quota Exceeded Error'; | |
break; | |
case FileError.INVALID_MODIFICATION_ERR: | |
message = 'Invalid Modification Error'; | |
break; | |
case FileError.INVALID_STATE_ERR: | |
message = 'Invalid State Error'; | |
break; | |
default: | |
message = 'Unknown Error'; | |
break; | |
} | |
console.log(message); | |
} | |
// Request a FileSystem and set the filesystem variable. | |
function initFileSystem() { | |
navigator.webkitPersistentStorage.requestQuota(1024 * 1024 * 5, | |
function(grantedSize) { | |
// Request a file system with the new size. | |
window.requestFileSystem(window.PERSISTENT, grantedSize, function(fs) { | |
// Set the filesystem variable. | |
filesystem = fs; | |
// Setup event listeners on the form. | |
setupFormEventListener(); | |
// Update the file browser. | |
listFiles(); | |
}, errorHandler); | |
}, errorHandler); | |
} | |
function loadFile(filename) { | |
filesystem.root.getFile(filename, {}, function(fileEntry) { | |
fileEntry.file(function(file) { | |
var reader = new FileReader(); | |
reader.onload = function(e) { | |
// Update the form fields. | |
filenameInput.value = filename; | |
contentTextArea.value = this.result; | |
}; | |
reader.readAsText(file); | |
}, errorHandler); | |
}, errorHandler); | |
} | |
function displayEntries(entries) { | |
// Clear out the current file browser entries. | |
fileList.innerHTML = ''; | |
entries.forEach(function(entry, i) { | |
var li = document.createElement('li'); | |
var link = document.createElement('a'); | |
link.innerHTML = entry.name; | |
link.className = 'edit-file'; | |
li.appendChild(link); | |
var delLink = document.createElement('a'); | |
delLink.innerHTML = '[x]'; | |
delLink.className = 'delete-file'; | |
li.appendChild(delLink); | |
fileList.appendChild(li); | |
// Setup an event listener that will load the file when the link | |
// is clicked. | |
link.addEventListener('click', function(e) { | |
e.preventDefault(); | |
loadFile(entry.name); | |
}); | |
// Setup an event listener that will delete the file when the delete link | |
// is clicked. | |
delLink.addEventListener('click', function(e) { | |
e.preventDefault(); | |
deleteFile(entry.name); | |
}); | |
}); | |
} | |
function listFiles() { | |
var dirReader = filesystem.root.createReader(); | |
var entries = []; | |
var fetchEntries = function() { | |
dirReader.readEntries(function(results) { | |
if (!results.length) { | |
displayEntries(entries.sort().reverse()); | |
} else { | |
entries = entries.concat(results); | |
fetchEntries(); | |
} | |
}, errorHandler); | |
}; | |
fetchEntries(); | |
} | |
// Save a file in the FileSystem. | |
function saveFile(filename, content) { | |
filesystem.root.getFile(filename, {create: true}, function(fileEntry) { | |
fileEntry.createWriter(function(fileWriter) { | |
fileWriter.onwriteend = function(e) { | |
// Update the file browser. | |
listFiles(); | |
// Clean out the form field. | |
filenameInput.value = ''; | |
contentTextArea.value = ''; | |
// Show a saved message. | |
messageBox.innerHTML = 'File saved!'; | |
}; | |
fileWriter.onerror = function(e) { | |
console.log('Write error: ' + e.toString()); | |
alert('An error occurred and your file could not be saved!'); | |
}; | |
var contentBlob = new Blob([content], {type: 'text/plain'}); | |
fileWriter.write(contentBlob); | |
}, errorHandler); | |
}, errorHandler); | |
} | |
function deleteFile(filename) { | |
filesystem.root.getFile(filename, {create: false}, function(fileEntry) { | |
fileEntry.remove(function(e) { | |
// Update the file browser. | |
listFiles(); | |
// Show a deleted message. | |
messageBox.innerHTML = 'File deleted!'; | |
}, errorHandler); | |
}, errorHandler); | |
} | |
// Add event listeners on the form. | |
function setupFormEventListener() { | |
form.addEventListener('submit', function(e) { | |
e.preventDefault(); | |
// Get the form data. | |
var filename = filenameInput.value; | |
var content = contentTextArea.value; | |
// Save the file. | |
saveFile(filename, content); | |
}); | |
} | |
// Start the app by requesting a FileSystem (if the browser supports the API) | |
if (window.requestFileSystem) { | |
initFileSystem(); | |
} else { | |
alert('Sorry! Your browser doesn\'t support the FileSystem API :('); | |
} | |
})(); |
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