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broken-images.js
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broken-images.js
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//
// Copyright (C) 2017 - present Instructure, Inc.
//
// This file is part of Canvas.
//
// Canvas is free software: you can redistribute it and/or modify it under
// the terms of the GNU Affero General Public License as published by the Free
// Software Foundation, version 3 of the License.
//
// Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
import $ from 'jquery'
import I18n from 'i18n!broken_images'
export function attachErrorHandler(imgElement) {
$(imgElement).on('error', e => {
if (e.currentTarget.src) {
$.get(e.currentTarget.src).fail(response => {
if (response.status === 403) {
// Replace the image with a lock image
$(e.currentTarget).attr({
src: '/images/svg-icons/icon_lock.svg',
alt: I18n.t('Locked image'),
width: 100,
height: 100
})
} else {
// Add the broken-image class
$(e.currentTarget).addClass('broken-image')
}
})
} else {
// Add the broken-image class (if there is no source)
$(e.currentTarget).addClass('broken-image')
}
})
}
export function getImagesAndAttach() {
Array.from(document.querySelectorAll('img:not([src=""])')).forEach(attachErrorHandler)
}
// this behavior will set up all broken images on the page with an error handler that
// can apply the broken-image class if there is an error loading the image.
$(document).ready(() => getImagesAndAttach())