如何检查textArea是否为空并启用或禁用特定按钮？

Question

按钮被禁用，但是只要我在textArea中写了一些按钮就不启用了！

我的代码：

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您的函数，通常是通过处理keyup之类的事件或（以处理其他更改，如粘贴）input。

Answer 2

您需要像这样添加此代码段

let obj={
   "name": "Retail Sales",
   "weight": 10,
   "length": 6,
   "type": "retailSales",
   "rows": [
      {
         "dealerEvaluationHistoryID": 0,
         "performanceDealerMappingDetailID": 14,
         "month": 1,
         "plan": 0,
         "actual": 0,
         "weight": 0,
         "pelanggaranWilayah": 0
      },
      {
         "dealerEvaluationHistoryID": 0,
         "performanceDealerMappingDetailID": 14,
         "month": 2,
         "plan": 0,
         "actual": 0,
         "weight": 0,
         "pelanggaranWilayah": 0
      },
      {
         "dealerEvaluationHistoryID": 0,
         "performanceDealerMappingDetailID": 14,
         "month": 3,
         "plan": 0,
         "actual": 0,
         "weight": 0,
         "pelanggaranWilayah": 0
      }
   ]
}
let array=obj.rows.map(function(row){
  return [row.month,row.plan,row.actual,row.weight];
});
console.log(JSON.stringify(array));