const el = document.getElementById("upload")
const placeholder = document.getElementById("upload-placeholder")
el.addEventListener("change", e => {
    const file = e.target.files[0]
    const url = URL.createObjectURL(file)
    const html = `<div class="control" style="margin-right: 6px;"><div class="image is-128x128"><img class="is-rounded" src="${url}"></div></div>`
    placeholder.innerHTML = html
    placeholder.insertAdjacentHTML("afterend", "<div>---></div>")
})