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index.js
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index.js
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// Import your code here
import './css/normalize.css';
import 'bootstrap/dist/css/bootstrap.css';
import 'font-awesome/css/font-awesome.css';
import './css/style.css';
import $ from 'jquery';
const $box = $('.box'),
$form = $('#upload-form'),
$input = $box.find('input[type="file"]'),
$btnSubmit = $('.box__button'),
$btnReset = $('.reset__button'),
$boxDropFile = $('.box__drop_file'),
$boxCanvas = $('.box__canvas'),
$boxNames = $('.box__names'),
$toast = $('#snackbar');
let radius = 1;
let droppedFiles = false;
//-----------------------------------------------
// Functional methods
//-----------------------------------------------
function identity(val) {
return val;
}
/**
* Compose functions with side effects
* @return composed functions
*/
function sideEffectCompose(...fns) {
return function composed(input) {
fns.reduceRight((_, f) => {
f(input);
}, identity);
return input;
};
}
//-----------------------------------------------
// Util methods
//-----------------------------------------------
function uploadFile(file) {
const formData = new FormData();
formData.append('image', file);
return $.ajax({
url: 'https://idol.chuphinhthe.com/api/recognition',
type: 'POST',
data: formData,
processData: false, // tell jQuery not to process the data
contentType: false, // tell jQuery not to set contentType
});
}
function getCanvas() {
return document.getElementById('artboard');
}
function saveContext() {
const ctx = getCanvas().getContext('2d');
ctx.save();
}
function restoreContext() {
const ctx = getCanvas().getContext('2d');
ctx.restore();
}
function clearCanvas() {
restoreContext();
const canvas = getCanvas();
const ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height);
$boxNames.html('');
}
function drawImage(file) {
if (!file) return;
const canvas = getCanvas();
const img = new Image();
img.onload = function() {
canvas.height = img.height;
canvas.getContext('2d').drawImage(img, 0, 0);
};
img.src = URL.createObjectURL(file);
}
function drawRect({ x, y, w, h }) {
const ctx = getCanvas().getContext('2d');
// Draw rect
ctx.beginPath();
ctx.rect(x, y, w, h);
ctx.strokeStyle = 'yellow';
ctx.lineWidth = 3;
ctx.stroke();
}
function drawName({ name, x, y, w }) {
const html = `<span class="box__names-item" style="top: ${y}px; left: ${x}px; width: ${w}px;">
<span>${name}</span>
</span>`;
$boxNames.append(html);
}
function showFiles(files) {
if (!files || !files.length) return;
clearCanvas();
$boxCanvas.removeClass('hidden');
$boxDropFile.addClass('hidden');
$btnReset.addClass('hidden');
$btnSubmit.removeClass('hidden');
drawImage(files[0]);
$btnSubmit.trigger('click');
}
function resetFiles() {
$boxCanvas.addClass('hidden');
$btnReset.addClass('hidden');
$boxDropFile.removeClass('hidden');
$btnSubmit.removeClass('hidden');
clearCanvas();
droppedFiles = false;
}
function toast(text) {
$toast.html(text).addClass('show');
setTimeout(function() {
$toast.removeClass('show');
}, 3000);
}
//-----------------------------------------------
// site effect drag drop
//-----------------------------------------------
const isAdvancedUpload = (function() {
const div = document.createElement('div');
return (
('draggable' in div || ('ondragstart' in div && 'ondrop' in div)) &&
'FormData' in window &&
'FileReader' in window
);
})();
$input
.on('focus', function() {
$input.addClass('has-focus');
})
.on('blur', function() {
$input.removeClass('has-focus');
});
if (isAdvancedUpload) {
$box
.on('drag dragstart dragend dragover dragenter dragleave drop', function(
e,
) {
e.preventDefault();
e.stopPropagation();
})
.on('dragover dragenter', function() {
$box.addClass('is-dragover');
})
.on('dragleave dragend drop', function() {
$box.removeClass('is-dragover');
})
.on('drop', function(e) {
droppedFiles = e.originalEvent.dataTransfer.files;
showFiles(droppedFiles);
});
}
//-----------------------------------------------
// Main methods
//-----------------------------------------------
$input.on('change', e => showFiles(e.target.files));
$btnReset.on('click', resetFiles);
$form.on('submit', e => {
e.preventDefault();
let file = $input[0].files[0];
if (isAdvancedUpload && droppedFiles) {
file = droppedFiles[0];
}
// prevent empty file
if (!file) {
toast('Please select your idol!');
$form.removeClass('is-uploading');
return;
}
// prevent multi check
if ($form.hasClass('is-uploading')) return false;
$form.addClass('is-uploading');
// Upload file to get detection and draw result
uploadFile(file)
.then(response => {
response.data.forEach(sideEffectCompose(drawRect, drawName, saveContext));
setTimeout(() => {
$form.removeClass('is-uploading');
$btnSubmit.addClass('hidden');
$btnReset.removeClass('hidden');
}, 1000);
})
.catch(err => {
console.log(err);
$form.removeClass('is-uploading');
});
});