Changing CSS with Javascript for required field

Question

Changing CSS with Javascript for required field

Asked 6 years, 10 months ago

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I got into W3 Schools and got an example code for a multi step form. In "default" mode it did not move to the next step until all fields were filled. Turns out I only need some fields to be not null, others may be empty.

I looked at the JS code and it picks up the Input tag like this:

y = x[currentTab].getElementsByTagName("input");

If it is empty the input css is changed and turns red

y[i].className += " invalid";

I changed the code to get the element by the ID, and it worked, the form does not go forward, but the CSS is not changed.

Below is the code, I thank anyone who can help me.

var currentTab = 0; // A tab padrão é a tab 0 (0)
showTab(currentTab); // Mostra a tab padrão

function showTab(n) {
  // Essa função mostra uma tab especifica do form...
  var x = document.getElementsByClassName("tab");
  x[n].style.display = "block";
  //... Muda o botão para "Enviar" ao termino do form:
  if (n == 0) {
    document.getElementById("prevBtn").style.display = "none";
  } else {
    document.getElementById("prevBtn").style.display = "inline";
  }
  if (n == (x.length - 1)) {
    document.getElementById("nextBtn").innerHTML = "Enviar";
  } else {
    document.getElementById("nextBtn").innerHTML = "Próximo";
  }
  //... and run a function that will display the correct step indicator:
  fixStepIndicator(n)
}

function nextPrev(n) {
  // This function will figure out which tab to display
  var x = document.getElementsByClassName("tab");
  // Exit the function if any field in the current tab is invalid:
  if (n == 1 && !validateForm()) return false;
  // Hide the current tab:
  x[currentTab].style.display = "none";
  // Increase or decrease the current tab by 1:
  currentTab = currentTab + n;
  // if you have reached the end of the form...
  if (currentTab >= x.length) {
    // ... the form gets submitted:
    document.getElementById("regForm").submit();
    return false;
  }
  // Otherwise, display the correct tab:
  showTab(currentTab);
}

function validateForm() {
  // Funcao de campos not null
  var x, y, i, valid = true;
  x = document.getElementsByClassName("tab");
  y = x[currentTab].getElementsById("notNull");
  // Loop que verifica os inputs da div ativa:
  for (i = 0; i < y.length; i++) {
    // se o campo estiver vazio...
    if (y[i].value == "") {
      // adiciona a classe "invalid" no campo:
      y[i].className += " invalid";
      // seta o valor do status para false
      valid = false;
    }
  }
  // se o status estiver true, marca o step como finalizado e valido:
  if (valid) {
    document.getElementsByClassName("step")[currentTab].className += " finish";
  }
  return valid; // retorna o status valido
}

function fixStepIndicator(n) {
  // This function removes the "active" class of all steps...
  var i, x = document.getElementsByClassName("step");
  for (i = 0; i < x.length; i++) {
    x[i].className = x[i].className.replace(" active", "");
  }
  //... and adds the "active" class on the current step:
  x[n].className += " active";
}

* {
  box-sizing: border-box;
}

body {
  background-color: #f1f1f1;
}

#regForm {
  background-color: #ffffff;
  margin: 100px auto;
  font-family: Raleway;
  padding: 40px;
  width: 70%;
  min-width: 300px;
}

h1 {
  text-align: center;
}

p {
  text-align: center;
}

input {
  padding: 10px;
  width: 100%;
  font-size: 17px;
  font-family: Raleway;
  border: 1px solid #aaaaaa;
}


/* Altera cor dos inputs que são requireds */

input.invalid {
  background-color: #ffdddd;
}


/* Esconde todos os steps por padrão: */

.tab {
  display: none;
}

button {
  background-color: #4CAF50;
  color: #ffffff;
  border: none;
  padding: 10px 20px;
  font-size: 17px;
  font-family: Raleway;
  cursor: pointer;
}

button:hover {
  opacity: 0.8;
}

#prevBtn {
  background-color: #bbbbbb;
}


/* Bolinhas que mostram o progresso do formulario */

.step {
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbbbbb;
  border: none;
  border-radius: 50%;
  display: inline-block;
  opacity: 0.5;
}

.step.active {
  opacity: 1;
}


/* Muda a cor da bolinha do step que esta preenchido e válido */

.step.finish {
  background-color: #4CAF50;
}

<!-- jQuery -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!-- bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<!-- bootstrap JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link href="https://fonts.googleapis.com/css?family=Raleway" rel="stylesheet">

<form id="regForm" action="/action_page.php">
  <h1>16º Encontro - "De volta ao berço"</h1>
  <p>Associação dos Militares Inativos de Guaratinguetá e Adjacências</p>
  <p>R: Mórmons, no 51 – Pedregulho – Guaratinguetá/ SP – CEP: 12.515-100- tel: (12) 3125-7798/ 3125-7843</p>
  <p>www.amigafa.com – email: [email protected]</p>
  <!-- Cada "tab" é um step do form: -->
  <div class="tab">Dados Pessoais:
    <p><input id="notNull" placeholder="CPF" oninput="this.className = ''" name="mil_cpf"></p>
    <p><input placeholder="RG Civil" oninput="this.className = ''" name="mil_rgCivil"></p>
    <p><input placeholder="RG Militar" oninput="this.className = ''" name="mil_rgMilitar"></p>
    <p><input placeholder="Nome" oninput="this.className = ''" name="mil_nome"></p>
    <p><input placeholder="Nome de Guerra" oninput="this.className = ''" name="mil_nomeGuerra"></p>
    <p><input placeholder="Posto/Graduação" oninput="this.className = ''" name="mil_postoGrad"></p>
    <p><input placeholder="Data de Formatura: DD/MM/AAAA" oninput="this.className = ''" name="mil_dataFormatura"></p>
  </div>
  <div class="tab">Endereço:
    <p><input placeholder="CEP" oninput="this.className = ''" name="mil_cpf"></p>
    <p><input placeholder="Endereço" oninput="this.className = ''" name="mil_endereco"></p>
    <p><input placeholder="Numero" oninput="this.className = ''" name="mil_numeroEndereco"></p>
    <p><input placeholder="Complemento" oninput="this.className = ''" name="mil_complementoEndereco"></p>
    <p><input placeholder="Bairro" oninput="this.className = ''" name="mil_bairro"></p>
    <p><input placeholder="Cidade" oninput="this.className = ''" name="mil_cidade"></p>
    <p><input placeholder="Estado/UF" oninput="this.className = ''" name="mil_estado"></p>
  </div>
  <div class="tab">Contatos:
    <p><input placeholder="Telefone: (XX) XXXX-XXXX" oninput="this.className = ''" name="mil_telefone"></p>
    <p><input placeholder="Celular: (XX) XXXXX-XXXX" oninput="this.className = ''" name="mil_celular"></p>
    <p><input placeholder="Email:" oninput="this.className = ''" name="mil_email"></p>
  </div>
  <div class="tab">Login Info:
    <p><input placeholder="Username..." oninput="this.className = ''" name="uname"></p>
    <p><input placeholder="Password..." oninput="this.className = ''" name="pword" type="password"></p>
  </div>
  <div style="overflow:auto;">
    <div style="float:right;">
      <button type="button" id="prevBtn" onclick="nextPrev(-1)">Voltar</button>
      <button type="button" id="nextBtn" onclick="nextPrev(1)">Próximo</button>
    </div>
  </div>
  <!-- Bolinhas que marcam o progresso, colocar na quantidade de steps que tem no form: -->
  <div style="text-align:center;margin-top:40px;">
    <span class="step"></span>
    <span class="step"></span>
    <span class="step"></span>
    <span class="step"></span>
  </div>
</form>

1 answer

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by Sam • **79,597** points · Answer 1 · 2018-01-21T20:24:09+00:00

First it is interesting to note that getElementsById does not exist. A id should be unique on the page.

The simple solution to the error is instead to use id="notNull", use class="notNull". So you can scroll through the elements with this class with:

y = x[currentTab].getElementsByClassName("notNull");

Replace the line:

y = x[currentTab].getElementsById("notNull");

for

y = x[currentTab].getElementsByClassName("notNull");

And the id="notNull" for class="notNull" in the element.

Example:

var currentTab = 0; // A tab padrão é a tab 0 (0)
showTab(currentTab); // Mostra a tab padrão

function showTab(n) {
  // Essa função mostra uma tab especifica do form...
  var x = document.getElementsByClassName("tab");
  x[n].style.display = "block";
  //... Muda o botão para "Enviar" ao termino do form:
  if (n == 0) {
    document.getElementById("prevBtn").style.display = "none";
  } else {
    document.getElementById("prevBtn").style.display = "inline";
  }
  if (n == (x.length - 1)) {
    document.getElementById("nextBtn").innerHTML = "Enviar";
  } else {
    document.getElementById("nextBtn").innerHTML = "Próximo";
  }
  //... and run a function that will display the correct step indicator:
  fixStepIndicator(n)
}

function nextPrev(n) {
  // This function will figure out which tab to display
  var x = document.getElementsByClassName("tab");
  // Exit the function if any field in the current tab is invalid:
  if (n == 1 && !validateForm()) return false;
  // Hide the current tab:
  x[currentTab].style.display = "none";
  // Increase or decrease the current tab by 1:
  currentTab = currentTab + n;
  // if you have reached the end of the form...
  if (currentTab >= x.length) {
    // ... the form gets submitted:
    document.getElementById("regForm").submit();
    return false;
  }
  // Otherwise, display the correct tab:
  showTab(currentTab);
}

function validateForm() {
  // Funcao de campos not null
  var x, y, i, valid = true;
  x = document.getElementsByClassName("tab");
  y = x[currentTab].getElementsByClassName("notNull");
//  y = document.getElementById("notNull");
  // Loop que verifica os inputs da div ativa:
  for (i = 0; i < y.length; i++) {
    // se o campo estiver vazio...
    if (y[i].value == "") {
      // adiciona a classe "invalid" no campo:
      y[i].className += " invalid";
      // seta o valor do status para false
      valid = false;
    }
  }
  // se o status estiver true, marca o step como finalizado e valido:
  if (valid) {
    document.getElementsByClassName("step")[currentTab].className += " finish";
  }
  return valid; // retorna o status valido
}

function fixStepIndicator(n) {
  // This function removes the "active" class of all steps...
  var i, x = document.getElementsByClassName("step");
  for (i = 0; i < x.length; i++) {
    x[i].className = x[i].className.replace(" active", "");
  }
  //... and adds the "active" class on the current step:
  x[n].className += " active";
}

* {
  box-sizing: border-box;
}

body {
  background-color: #f1f1f1;
}

#regForm {
  background-color: #ffffff;
  margin: 100px auto;
  font-family: Raleway;
  padding: 40px;
  width: 70%;
  min-width: 300px;
}

h1 {
  text-align: center;
}

p {
  text-align: center;
}

input {
  padding: 10px;
  width: 100%;
  font-size: 17px;
  font-family: Raleway;
  border: 1px solid #aaaaaa;
}


/* Altera cor dos inputs que são requireds */

input.invalid {
  background-color: #ffdddd;
}


/* Esconde todos os steps por padrão: */

.tab {
  display: none;
}

button {
  background-color: #4CAF50;
  color: #ffffff;
  border: none;
  padding: 10px 20px;
  font-size: 17px;
  font-family: Raleway;
  cursor: pointer;
}

button:hover {
  opacity: 0.8;
}

#prevBtn {
  background-color: #bbbbbb;
}


/* Bolinhas que mostram o progresso do formulario */

.step {
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbbbbb;
  border: none;
  border-radius: 50%;
  display: inline-block;
  opacity: 0.5;
}

.step.active {
  opacity: 1;
}


/* Muda a cor da bolinha do step que esta preenchido e válido */

.step.finish {
  background-color: #4CAF50;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

<form id="regForm" action="/action_page.php">
  <h1>16º Encontro - "De volta ao berço"</h1>
  <p>Associação dos Militares Inativos de Guaratinguetá e Adjacências</p>
  <p>R: Mórmons, no 51 – Pedregulho – Guaratinguetá/ SP – CEP: 12.515-100- tel: (12) 3125-7798/ 3125-7843</p>
  <p>www.amigafa.com – email: [email protected]</p>
  <!-- Cada "tab" é um step do form: -->
  <div class="tab">Dados Pessoais:
    <p><input class="notNull" placeholder="CPF" oninput="this.className = ''" name="mil_cpf"></p>
    <p><input placeholder="RG Civil" oninput="this.className = ''" name="mil_rgCivil"></p>
    <p><input placeholder="RG Militar" oninput="this.className = ''" name="mil_rgMilitar"></p>
    <p><input placeholder="Nome" oninput="this.className = ''" name="mil_nome"></p>
    <p><input placeholder="Nome de Guerra" oninput="this.className = ''" name="mil_nomeGuerra"></p>
    <p><input placeholder="Posto/Graduação" oninput="this.className = ''" name="mil_postoGrad"></p>
    <p><input placeholder="Data de Formatura: DD/MM/AAAA" oninput="this.className = ''" name="mil_dataFormatura"></p>
  </div>
  <div class="tab">Endereço:
    <p><input placeholder="CEP" oninput="this.className = ''" name="mil_cpf"></p>
    <p><input placeholder="Endereço" oninput="this.className = ''" name="mil_endereco"></p>
    <p><input placeholder="Numero" oninput="this.className = ''" name="mil_numeroEndereco"></p>
    <p><input placeholder="Complemento" oninput="this.className = ''" name="mil_complementoEndereco"></p>
    <p><input placeholder="Bairro" oninput="this.className = ''" name="mil_bairro"></p>
    <p><input placeholder="Cidade" oninput="this.className = ''" name="mil_cidade"></p>
    <p><input placeholder="Estado/UF" oninput="this.className = ''" name="mil_estado"></p>
  </div>
  <div class="tab">Contatos:
    <p><input placeholder="Telefone: (XX) XXXX-XXXX" oninput="this.className = ''" name="mil_telefone"></p>
    <p><input placeholder="Celular: (XX) XXXXX-XXXX" oninput="this.className = ''" name="mil_celular"></p>
    <p><input placeholder="Email:" oninput="this.className = ''" name="mil_email"></p>
  </div>
  <div class="tab">Login Info:
    <p><input placeholder="Username..." oninput="this.className = ''" name="uname"></p>
    <p><input placeholder="Password..." oninput="this.className = ''" name="pword" type="password"></p>
  </div>
  <div style="overflow:auto;">
    <div style="float:right;">
      <button type="button" id="prevBtn" onclick="nextPrev(-1)">Voltar</button>
      <button type="button" id="nextBtn" onclick="nextPrev(1)">Próximo</button>
    </div>
  </div>
  <!-- Bolinhas que marcam o progresso, colocar na quantidade de steps que tem no form: -->
  <div style="text-align:center;margin-top:40px;">
    <span class="step"></span>
    <span class="step"></span>
    <span class="step"></span>
    <span class="step"></span>
  </div>
</form>