I'm doing a homework, I want the code to when I press the "Salvar" button, change the textbox again to onlyreadable, but it's not working properly, even with me changing the readonly to TRUE again.

This is the code:

function DeleteItem(){
    console.log(this.parentElement)
    this.parentElement.remove()
}


function EditarItem(){
    criar_textbox.readOnly = false
}
function SalvarItem(){
    criar_textbox.readOnly = true
    console.log(criar_textbox.readOnly)
}
function CriarBotaoSalvar(){
    const botao_salvar = document.createElement('button')
    botao_salvar.classList.add("btn", "btn-success")
    botao_salvar.type = "button"
    botao_salvar.innerHTML = "Salvar"
    botao_salvar.addEventListener("click", SalvarItem() )
    return botao_salvar
}

function CriarBotaoEdit(){
    const botao_edit = document.createElement('button')
    botao_edit.classList.add("btn", "btn-warning")
    botao_edit.type = "button"
    botao_edit.innerHTML = "  Edit  "
    botao_edit.addEventListener("click", EditarItem )
    
    return botao_edit
}

function CriarBotaoDelete(){
    const botao_delete =  document.createElement('button')
    botao_delete.classList.add("btn", "btn-danger")
    botao_delete.innerHTML = "Delete"
    botao_delete.type = "button"
    botao_delete.addEventListener("click", DeleteItem);

    return botao_delete
}

function Submit(){
    const lista = document.querySelector('[data-task]')
    const valor = document.querySelector('[data-form-input]')
    criar_textbox = document.createElement('input')
    criar_textbox.type = 'text'
    criar_textbox.readOnly = true

    novo_item_lista = document.createElement("li")
    lista.appendChild(novo_item_lista)
    criar_textbox.value = valor.value

    novo_item_lista.appendChild(criar_textbox)
    novo_item_lista.appendChild(CriarBotaoEdit())
    novo_item_lista.appendChild(CriarBotaoSalvar())

    novo_item_lista.appendChild(CriarBotaoDelete())



    document.getElementById("item").value = ""
}

Thank you very much, I can't find out what i'm doing wrong because when I print the readonly, it is set to true.