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how to check if username already exists in database using javascript

Huy Nguyen answered on July 31, 2021 Popularity 8/10 Helpfulness 2/10

answer how to check if username already exists in database using javascript

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how to check if username already exists in database using javascript

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function validacija() {

  let user = document.getElementById('user');
  let listOptions = document.querySelectorAll("#list option");


  if (user.value.length <= 20 && user.value.length >= 3) {} else {
    alert("Username has to be between 3-20 characters.")
  }


  for (let i = 0; i < listOptions.length; i++) {
    if (listOptions[i].value === user.value) {
      alert('The name already exist')
    }
  }
  return false;
}

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: database exists javascript using

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Contributed on Jul 31 2021

Huy Nguyen

0 Answers Avg Quality 2/10

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how to check if username already exists in database using javascript

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<form onsubmit="return validacija()">
  <table>
    <tr>
      <td>Username:</td>
      <td><input type="text" id="user" name="user" list="list"></td>
      <datalist id="list">
                    <option value="Tilen">
                    <option value="Marko">
                    <option value="Teja">
                    <option value="Tisa">
                    <option value="Rok">
                    <option value="Luka">
                    <option value="Mojca">
                </datalist>
    </tr>
  </table>
</form>

Popularity 8/10 Helpfulness 1/10 Language javascript

Source: stackoverflow.com

Tags: using javascript database exists us

Link to this answer
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Contributed on Jul 31 2021

Huy Nguyen

0 Answers Avg Quality 2/10

how to check if username already exists in database using javascript

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