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d2l-file-uploader.html
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d2l-file-uploader.html
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<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../d2l-colors/d2l-colors.html">
<link rel="import" href="../app-localize-behavior/app-localize-behavior.html">
<link rel="import" href="../d2l-offscreen/d2l-offscreen-shared-styles.html">
<!--
`d2l-file-uploader` is a web component for uploading files.
@demo demo/index.html
-->
<dom-module id="d2l-file-uploader">
<template strip-whitespace>
<style include="d2l-offscreen-shared-styles">
:host {
box-sizing: border-box;
display: block;
max-width: 27rem;
}
:host([feedback-type="warning"]) {
--d2l-file-uploader-feedback-color: var(--d2l-color-feedback-warning);
}
:host([feedback-type="error"]) {
--d2l-file-uploader-feedback-color: var(--d2l-color-feedback-error);
}
.d2l-file-uploader-drop-zone {
border: 2px dashed var(--d2l-color-ferrite);
border-radius: 0.3rem;
padding: 1.5rem;
text-align: center;
}
:host([_file-drag-over]) .d2l-file-uploader-drop-zone {
border-color: var(--d2l-color-celestine);
background-color: var(--d2l-color-celestine-plus-2);
}
.d2l-file-uploader-icon {
padding-bottom: 0.5rem;
}
:host([_file-drag-over]) svg path {
fill: var(--d2l-color-celestine);
}
#d2l-file-uploader-offscreen {
@apply --d2l-offscreen;
}
.d2l-file-uploader-input {
display: inline-block;
height: 100%;
left: 0;
opacity: 0;
position: absolute;
top: 0;
width: 100%;
}
.d2l-file-uploader-browse-label {
background: none;
border: none;
color: var(--d2l-color-celestine);
overflow: hidden;
padding-right: 0;
position: relative;
}
.d2l-file-uploader-browse-label:hover,
.d2l-file-uploader-browse-label-focus {
color: var(--d2l-color-celestine-minus-1);
text-decoration: underline;
}
.d2l-file-uploader-browse-files {
display: none;
}
.d2l-file-uploader-feedback {
-webkit-animation-name: feedbackIn;
animation-name: feedbackIn;
-webkit-animation-duration: 0.7s;
animation-duration: 0.7s;
border: 1px solid var(--d2l-color-mica);
border-left-width: 0.5rem;
border-left-color: var(--d2l-file-uploader-feedback-color);
border-radius: 0.3rem;
display: none;
margin-bottom: 1.5rem;
padding: 0.7rem 1rem 0.7rem;
}
:host-context([dir="rtl"]) > .d2l-file-uploader-feedback {
border-left-width: 1px;
border-left-color: var(--d2l-color-mica);
border-right-width: 0.5rem;
border-right-color: var(--d2l-file-uploader-feedback-color);
}
:host([feedback]) > .d2l-file-uploader-feedback {
display: block;
}
@keyframes feedbackIn {
0% {
max-height: 0.1rem;
opacity: 0;
}
20% {
opacity: 0;
}
80% {
max-height: 3rem;
}
100% {
opacity: 1;
}
}
@media (max-width: 992px) {
.d2l-file-uploader-input-container {
display: block;
margin-top: 0.8rem;
}
.d2l-file-uploader-browse-files {
display: inline;
}
.d2l-file-uploader-browse {
display: none;
}
.d2l-file-uploader-browse-label {
background-color: var(--d2l-color-celestine);
border: 1px solid;
border-radius: 0.3rem;
border-color: var(--d2l-color-celestine-minus-1);
color: #ffffff;
display: inline-block;
font-size: 0.7rem;
padding: 0.35rem 1.5rem;
}
.d2l-file-uploader-browse-label:hover,
.d2l-file-uploader-browse-label-focus {
background-color: var(--d2l-color-celestine-minus-1);
color: #ffffff;
text-decoration: none;
}
.d2l-file-uploader-browse-label-focus {
box-shadow: 0 0 0 4px rgba(0, 111, 191, 0.3);
}
}
</style>
<div class="d2l-file-uploader-feedback" role="alert">{{feedback}}</div>
<div class="d2l-file-uploader-drop-zone">
<svg width="78" height="78" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 78 78" class="d2l-file-uploader-icon">
<path fill="#565a5c" d="M54.76 36A3.992 3.992 0 0 1 51 38.64h-9v36a3 3 0 0 1-6 0v-36h-9a4 4 0 0 1-2.56-7.07l12-10a3.988 3.988 0 0 1 5.12 0l12 10a4.007 4.007 0 0 1 1.2 4.43zM46 53.55a1.333 1.333 0 0 0 .49.09M46.5 50.64a1.386 1.386 0 0 0-.5.09"/>
<path fill="#565a5c" d="M78 36.14a17.52 17.52 0 0 1-17.5 17.5c-.17 0-1.33 0-1.5-.02l-12.51.02a1.333 1.333 0 0 1-.49-.09 1.494 1.494 0 0 1 0-2.82 1.386 1.386 0 0 1 .5-.09h14a14.5 14.5 0 0 0 1.58-28.92c-.52-.05-1.05-.08-1.58-.08h-.35a1.49 1.49 0 0 1-1-.4 2.258 2.258 0 0 1-.542-1.075c-.138-.462-.306-.916-.478-1.365a20.484 20.484 0 0 0-38.26 0q-.21.54-.39 1.08a3.353 3.353 0 0 1-.53 1.26 1.542 1.542 0 0 1-1.12.5h-.33c-.53 0-1.06.03-1.58.08a14.5 14.5 0 0 0 1.58 28.92h13.99a1.5 1.5 0 0 1 .01 3s-13.5 0-13.5-.02a4.176 4.176 0 0 1-.5.02 17.5 17.5 0 0 1-.77-34.98 23.49 23.49 0 0 1 44.54 0A17.52 17.52 0 0 1 78 36.14z"/>
</svg>
<div>
<span>{{_message}} </span>
<span class="d2l-file-uploader-input-container">
<span id="d2l-file-uploader-offscreen">[[label]]</span>
<label class="d2l-file-uploader-browse-label">
<input class="d2l-file-uploader-input" type="file"
aria-describedby="d2l-file-uploader-offscreen"
multiple="[[multiple]]"
on-change="_fileSelectHandler"
on-focus="__onInputFocus"
on-blur="__onInputBlur" />
<span class="d2l-file-uploader-browse">{{localize('browse')}}</span>
<span class="d2l-file-uploader-browse-files">{{localize('browse_files')}}</span>
</label>
</span>
</div>
</div>
</template>
<script>
Polymer({
is: 'd2l-file-uploader',
behaviors: [
Polymer.AppLocalizeBehavior
],
properties: {
/**
* Fired when files have been added to the uploaded.
*
* @event d2l-file-uploader-files-added
* @param {Array<File>} files Array of [File](https://developer.mozilla.org/en-US/docs/Web/API/File) objects.
*/
/**
* When set, displays a feedback message to the user. Used in conjunction with `feedback-type`.
*/
feedback: {
type: String,
notify: true,
reflectToAttribute: true
},
/**
* The type of feedback to display. One of: "error", "warning"
*/
feedbackType: {
type: String,
reflectToAttribute: true,
value: 'warning'
},
/**
* A descriptive label to associate with the file input. Should
* be unique enough to distinguish the input from others on the page.
*/
label: {
type: String
},
/**
* Language of the page. Should correspond to one of the supported language codes in `locales.json`.
*/
language: {
type: String,
value: 'en'
},
/**
* Whether multiple files can be uploaded.
*/
multiple: {
type: Boolean,
value: false,
reflectToAttribute: true
},
/**
* Collection of uploaded files, as [File](https://developer.mozilla.org/en-US/docs/Web/API/File) objects.
*/
_files: {
type: Object,
observer: '_fileChangeHandler'
},
/**
* Whether a file is currently being dragged over the document.
*/
_fileDragOver: {
type: Boolean,
value: false,
reflectToAttribute: true
},
/**
* Message to display to the user.
*/
_message: {
type: String,
computed: '_computeMessage(localize, multiple)'
}
},
attached: function() {
this.loadResources(this.resolveUrl('locales.json'));
this.listen(document, 'dragover', '__onDragOver');
this.listen(document, 'dragleave', '__onDragLeave');
this.listen(document, 'dragend', '__onDragEnd');
this.listen(document, 'drop', '__onDrop');
},
detached: function() {
this.unlisten(document, 'dragover', '__onDragOver');
this.unlisten(document, 'dragleave', '__onDragLeave');
this.unlisten(document, 'dragend', '__onDragEnd');
this.unlisten(document, 'drop', '__onDrop');
},
_computeMessage: function(localize, multiple) {
var term = multiple ? 'multiple_file_upload_text' : 'single_file_upload_text';
return localize(term);
},
_fileSelectHandler: function(event) {
var files = [];
for (var i = 0; i < event.target.files.length; i++) {
files[i] = event.target.files[i];
}
this._files = files;
},
__onDragOver: function(event) {
event.preventDefault();
this._fileDragOver = true;
},
__onDragLeave: function(event) {
event.preventDefault();
this._fileDragOver = false;
},
__onDragEnd: function(event) {
this._fileDragOver = false;
var dataTransfer = event.dataTransfer;
if (dataTransfer.items) {
// Use DataTransferItemList interface to remove the drag data
for (var i = 0; i < dataTransfer.items.length; i++) {
dataTransfer.items.remove(i);
}
} else {
// Use DataTransfer interface to remove the drag data
event.dataTransfer.clearData();
}
},
__onDrop: function(event) {
event.preventDefault();
this._fileDragOver = false;
var files = [];
var dataTransfer = event.dataTransfer;
if (dataTransfer.items) {
if (!this.multiple && dataTransfer.items.length > 1) {
this.feedback = this.localize('choose_one_file_to_upload');
this.feedbackType = 'warning';
return;
}
this.feedback = null;
// Use DataTransferItemList interface to access the file(s)
var count = 0;
for (var i = 0; i < dataTransfer.items.length; i++) {
if (dataTransfer.items[ i ].kind === 'file') {
files[count] = dataTransfer.items[i].getAsFile();
count++;
}
}
} else {
if (!this.multiple && dataTransfer.files.length > 1) {
this.feedback = this.localize('choose_one_file_to_upload');
this.feedbackType = 'warning';
return;
}
this.feedback = null;
// Use DataTransfer interface to access the file(s)
for (var j = 0; j < dataTransfer.files.length; j++) {
files[j] = dataTransfer.files[j];
}
}
this._files = files;
},
__onInputFocus: function() {
this.$$('.d2l-file-uploader-browse-label').classList.add('d2l-file-uploader-browse-label-focus');
},
__onInputBlur: function() {
this.$$('.d2l-file-uploader-browse-label').classList.remove('d2l-file-uploader-browse-label-focus');
},
_fileChangeHandler: function(files) {
var evt = new CustomEvent(
'd2l-file-uploader-files-added',
{detail: {files: files}}
);
this.dispatchEvent( evt );
}
});
</script>
</dom-module>