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simpleFileUploader.js
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simpleFileUploader.js
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/*File upload
* The fileUploadState object contains the filesArr which holds the latest files that we need to upload.
* A DataTransfer object is used to set the files of the input so they can be submitted synchronously.
* */
let fileUploadState = {filesArr: [], fileInputHolder: new DataTransfer()};
let simpleFileUploaderHolder = {id: "simpleFileUploader", options: {fileType: "file", maxFileSize: 0, maxFileCount: 0}}
/*Revert back the uploadState and fileInputHolder objects*/
function resetFileUploadState() {
fileUploadState = {filesArr: [], fileInputHolder: new DataTransfer()};
}
function isFileImage(file) {
return file && file['type'].split('/')[0] === 'image';
}
/*Adds files to the upload state after doing few checks:
* 1. Same file names are ignored.
* 2. Files added more than the maximum number accepted are rejected.
* 3. Checks if only images are allowed.
* 4. Checks file size for each file before adding.
* After adding, the same file is added to the data transfer object so it can be used in the form input file when submitting.
* */
function addFilesToState(files, fileElement) {
let fileUploadErrors = document.querySelector('[id=fileUploadErrors]');
let loopIndex = 0;
while (loopIndex < files.length) {
let file = files[loopIndex++];
if (!fileUploadState.filesArr.some(e => e.name === file.name)) {
let maxFileCount = simpleFileUploaderHolder.options.maxFileCount;
if (fileUploadState.filesArr.length !== Number(maxFileCount)) {
if (file.size < (simpleFileUploaderHolder.options.maxFileSize * 1000)) {
if (simpleFileUploaderHolder.options.fileType === "image") {
if (isFileImage(file)) {
fileUploadState.filesArr.push(file);
fileUploadState.fileInputHolder.items.add(file);
} else {
fileUploadErrors.style.display = "block";
fileUploadErrors.textContent = "Only images allowed.";
}
} else {
fileUploadState.filesArr.push(file);
fileUploadState.fileInputHolder.items.add(file);
}
} else {
fileUploadErrors.style.display = "block";
fileUploadErrors.textContent = "File size exceeds limit.";
}
} else {
fileUploadErrors.style.display = "block";
fileUploadErrors.textContent = "Only " + maxFileCount + " files allowed.";
}
}
new Promise((resolve) => setTimeout(resolve, 2000)).then(() => {
fileUploadErrors.style.display = "none";
});
}
fileElement.files = fileUploadState.fileInputHolder.files;
}
function getFileSizeAndSuffix(size) {
let suffix = "bytes";
if (size >= 1024 && size < 1024000) {
suffix = "KB";
size = Math.round(size / 1024 * 100) / 100;
} else if (size >= 1024000) {
suffix = "MB";
size = Math.round(size / 1024000 * 100) / 100;
}
return size + suffix;
}
/*Shows file previews based on types. Images have previews of the image itself in a 300 by 150 px size.
* Other files are displayed using a generic file image as the preview.
* File information such as name and size are included.
* Files added to preview can be removed using the delete button.
*/
function renderFileUploadList(filePreviewer, previewList, fileElement) {
let fileMap = fileUploadState.filesArr.map((file, index) => {
let imageUrlPreview = isFileImage(file) ? URL.createObjectURL(file) : "file.png";
return '<li class="text-center" id="' + index + '"> ' +
'<img src="' + imageUrlPreview + '" class="preview-image" alt="preview">' +
'<img src="delete.png" class="deleteImage cursor-pointer" alt="delete" title="delete">' +
'<h6 class="file-name text-center text-medium">' + file.name.replace(/(.{30})..+/, "$1…") + '' +
'<span class="file-size text-x-small display-inline-block">' + getFileSizeAndSuffix(file.size) + '</span>' +
'</h6>' +
'</li>';
});
let deleteImageIcon = document.getElementsByClassName('deleteImage');
let stringPreviewHtml = "";
let stringPreviewHtmlIndex = 0;
while (stringPreviewHtmlIndex < fileMap.length) {
stringPreviewHtml += fileMap[stringPreviewHtmlIndex++].toString();
}
filePreviewer.style.display = "block";
previewList.innerHTML = stringPreviewHtml;
let deleteImageIconIndex = 0;
if (fileUploadState.filesArr.length !== 0) {
while (deleteImageIconIndex < deleteImageIcon.length) {
deleteImageIcon[deleteImageIconIndex++].addEventListener('click', function () {
let key = this.parentNode.getAttribute("id");
fileUploadState.filesArr.splice(key, 1);
fileUploadState.fileInputHolder.items.remove(key);
renderFileUploadList(filePreviewer, previewList, fileElement);
});
}
} else {
fileElement.value = "";
filePreviewer.style.display = "none";
}
}
/*Helps to render files from the server back to the form during editing.
* Adds files to the upload state first, then to the data transfer object which then adds files to the input.
* */
function restoreFilesToInput(fileSrcArr) {
let fileElement = document.querySelector('[id=' + simpleFileUploaderHolder.id + ']');
if (fileSrcArr.length) {
let fileSrc = fileSrcArr[0];
let fileNameSplit = fileSrc.split('/');
fetch(fileSrc)
.then(res => res.blob())
.then(blob => {
let currentFile = new File([blob], fileNameSplit[fileNameSplit.length - 1],
{type: (fileElement.getAttribute('data-file-type') === 'image') ? "image/png" : "text/plain"});
fileUploadState.filesArr.push(currentFile);
fileUploadState.fileInputHolder.items.add(currentFile);
if (fileSrcArr.pop) {
renderFileUploadList(document.querySelector('[id=filePreviewer]'), document.querySelector('[id=previewList]'),
fileElement);
/*Restore files to input*/
fileElement.files = fileUploadState.fileInputHolder.files;
}
fileSrcArr.shift();
restoreFilesToInput(fileSrcArr, fileElement);
});
}
}
/*Initialize the uploader*/
function simpleFileUploader(elementId, options) {
simpleFileUploaderHolder = {
id: elementId, options: options
};
document.addEventListener('change', function (e) {
let currentElement = e.target;
if (currentElement.matches('#' + simpleFileUploaderHolder.id + '')) {
let fileElement = document.querySelector('[id=' + simpleFileUploaderHolder.id + ']');
addFilesToState(fileElement.files, fileElement);
renderFileUploadList(document.querySelector('[id=filePreviewer]'), document.querySelector('[id=previewList]'), fileElement);
}
});
document.addEventListener('dragover', function (e) {
e.preventDefault();
});
document.addEventListener('dragenter', function (e) {
e.preventDefault();
});
document.addEventListener('drop', function (e) {
e.preventDefault();
let currentElement = e.target;
if (currentElement.matches('.file-label')) {
let dT = new DataTransfer();
let loopIndex = 0;
while (loopIndex < e.dataTransfer.files.length) {
dT.items.add(e.dataTransfer.files[loopIndex++]);
}
let fileElement = document.querySelector('[id=' + simpleFileUploaderHolder.id + ']');
addFilesToState(dT.files, fileElement);
renderFileUploadList(document.querySelector('[id=filePreviewer]'), document.querySelector('[id=previewList]'), fileElement);
}
});
}