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panel/app/javascript/etc/image_preview.js

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JavaScript

document.addEventListener('turbolinks:load', () => {
document.querySelectorAll('input[type=file]').forEach(file => {
if (!file.dataset.preview) return
file.addEventListener('change', event => {
if (file.files.length === 0) return
document.querySelector('#' + file.dataset.preview).src = window.URL.createObjectURL(file.files[0])
})
})
})