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Sleeping
File size: 4,313 Bytes
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class ImageNavigator {
constructor() {
this.targets = [
'blank',
'circle',
'rectangle'
];
this.sources = [];
this.idx = 0;
this.imgPlaceholder = document.getElementById('imgPlaceholder');
// this.imgData = null;
this.prevBtn = document.getElementById('prevBtn');
this.nextBtn = document.getElementById('nextBtn');
}
async getImgData(target) {
try {
let res = await fetch(
'../draw?target=' + target,
{
method: 'GET'
}
);
return await res.json();
} catch (error) {
console.log(error);
}
}
async fetchImgData(target) {
let imgDataObj = await this.getImgData(target);
if (imgDataObj != null) {
// this.imgData = imgDataObj.data;
// this.imgPlaceholder.innerHTML = '<img src=' + this.imgData + '>';
return imgDataObj.data;
}
return null;
}
toggleImage(change) {
this.idx += change;
if (this.idx < 0)
this.idx += this.sources.length;
else
this.idx %= this.sources.length;
this.imgPlaceholder.src = this.sources[this.idx];
}
toPrevImage() {
this.toggleImage(-1);
}
toNextImage() {
this.toggleImage(1);
}
async initialize() {
// this.targets.forEach(
// target => {
// let targetSrc = await this.fetchImgData(target);
// this.sources.push(targetSrc);
// }
// )
for (var i = 0; i < this.targets.length; i++) {
var target = this.targets[i];
let targetSrc = await this.fetchImgData(target);
this.sources.push(targetSrc);
}
// this.imgPlaceholder.src = this.sources[this.idx];
this.toggleImage(0);
this.prevBtn.addEventListener('mouseup', e => this.toPrevImage());
this.nextBtn.addEventListener('mouseup', e => this.toNextImage());
}
}
var imageNav = new ImageNavigator();
imageNav.initialize();
class DropHandler {
constructor() {
this.dropZone = document.getElementById('drop_zone');
this.droppedImages = document.getElementById('droppedImages');
}
validateImage(image) {
var validTypes = ['image/jpeg', 'image/png', 'image/gif'];
if (validTypes.indexOf(image.type) == -1) {
console.log('Invalid File Type: ' + image.type);
return false;
}
var maxSizeInBytes = 10e6; //10MB
if (image.size > maxSizeInBytes) {
console.log('File is too large: ' + image.size);
return false
}
return true;
}
/**
* Refer to https://soshace.com/the-ultimate-guide-to-drag-and-drop-image-uploading-with-pure-javascript/
* @param {object} event
*/
processDrop(event) {
console.log('File(s) dropped');
// Prevent default behavior (Prevent file from being opened)
event.preventDefault();
var dt = event.dataTransfer;
var files = dt.files;
if (files.length > 0) {
for (var i = 0; i < files.length; i++) {
if (this.validateImage(files[i])) {
var img = document.createElement('img');
var reader = new FileReader();
reader.onload = function (e) {
img.src = e.target.result;
imageNav.sources.push(e.target.result);
}
reader.readAsDataURL(files[i]);
this.droppedImages.appendChild(img);
}
}
}
else
console.log('Dropped ' + files.length + ' files.');
}
processDragOver(event) {
console.log('File(s) in drop zone');
// Prevent default behavior (Prevent file from being opened)
event.preventDefault();
}
initialize() {
this.dropZone.addEventListener('drop', e => this.processDrop(e));
this.dropZone.addEventListener('dragover', e => this.processDragOver(e));
}
}
var dropHandler = new DropHandler();
dropHandler.initialize(); |