如何检查textArea是否为空并启用或禁用特定按钮？

Question

It is coming with the button disabled, however as soon as I write something in the textArea the button does not enable!

MY CODE:

function teste(){
  btnEnviar = document.getElementById('btnAnalisarImagem');
  txtAreaInserirURLImagem = document.getElementById('inserirURLImagem').value;

  if(!txtAreaInserirURLImagem){
    return btnEnviar.disabled = true;
  } else {
    return btnEnviar.disabled = false;
  }
}

Answer 1

您需要在内容更改时再次调用函数，通常是通过处理诸如keyup事件或（以处理诸如粘贴之类的其他更改） input 。

Answer 2

You need to add this snippet like so

btnEnviar = document.getElementById('btnAnalisarImagem');
btnEnviar.onKeyUp = teste