Falidate Form

 function validateForm() {

var ct=0

var inputs=document.getElementsByTagName("input")

for (i = 0 i < inputs.length i++) {

try{

if(inputs[i].value == '' && inputs[i].title.toLowerCase() == 'penting') {

ct = 1

inputs[i].style.background= "blue"

}

}catch(e){}

}

    if (ct != 0) {

        alert("Yang Berwarna kuning harus di isi")

        return false

    }

}

x = document.querySelectorAll(".example")

  for (i = 0 i < x.length i++) {

    x[i].style.backgroundColor = "red"

  }