What steps can be taken to resolve an error message?

Question

What steps can be taken to resolve an error message?

I needed to create an error message in a distinctive color using CSS when a user enters a letter instead of a number in a form. I successfully implemented this feature, however, I encountered an issue where the error message remains visible even after the user corrects their input by entering a number. How can I resolve this problem?

<html>
  <head>
    <style>
    #error {color: red;}
    </style>
  </head>
  <body>
    <p id="error"></p>
    <p id="demo"></p>
    <input id="demo1" type="text" />
    <button onclick="vote()"> Click here</button>
    <script>
      function vote() {
        var age = document.getElementById("demo1").value;
        if (isNaN(age)) {
          document.getElementById("error").innerHTML = "Input Error!!";
        } else {
          document.getElementById("demo").innerHTML = (age < 18) ? "Too young to vote" : "Old enough to vote";
        }
      }
    </script>
  </body>
</html>

javascript

Answer 1

Answer №1

Implemented the line

document.getElementById("id").innerHTML = "";

to clear existing content before proceeding with a new entry:

function checkAge() {

  var errorMsg = document.getElementById("error");
  var resultMsg = document.getElementById("result");
  
errorMsg.innerHTML = "";
resultMsg.innerHTML = "";  
  
  var age = document.getElementById("ageInput").value;
  if (isNaN(age)) {
    errorMsg.innerHTML = "Invalid input!";
  } else {
    resultMsg.innerHTML = (age < 18) ? "Too young to vote" : "Old enough to vote";
  }
}

body {
  background: lavender;  
}

#error {
  color: red;
}

<input id="ageInput" type="text" />
<button onclick="checkAge()"> Check Age </button>
<p id="error"></p><p id="result"></p>

Answer 2

Implemented the line

document.getElementById("id").innerHTML = "";

to clear existing content before proceeding with a new entry:

function checkAge() {

  var errorMsg = document.getElementById("error");
  var resultMsg = document.getElementById("result");
  
errorMsg.innerHTML = "";
resultMsg.innerHTML = "";  
  
  var age = document.getElementById("ageInput").value;
  if (isNaN(age)) {
    errorMsg.innerHTML = "Invalid input!";
  } else {
    resultMsg.innerHTML = (age < 18) ? "Too young to vote" : "Old enough to vote";
  }
}

body {
  background: lavender;  
}

#error {
  color: red;
}

<input id="ageInput" type="text" />
<button onclick="checkAge()"> Check Age </button>
<p id="error"></p><p id="result"></p>

Answer 3

Answer №2

One way to achieve this is by implementing a keyup event listener on the input element to validate each character as it is entered.

<input id="example" type="text" onkeyup="checkInput()" />

function checkInput() {
    if (isNaN(value)) {
        document.getElementById("errorMessage").innerHTML = "Invalid Input!";
    } else {
        document.getElementById("errorMessage").innerHTML = "";
    }
}

Answer 4

One way to achieve this is by implementing a keyup event listener on the input element to validate each character as it is entered.

<input id="example" type="text" onkeyup="checkInput()" />

function checkInput() {
    if (isNaN(value)) {
        document.getElementById("errorMessage").innerHTML = "Invalid Input!";
    } else {
        document.getElementById("errorMessage").innerHTML = "";
    }
}

What steps can be taken to resolve an error message?

Answer №1

Answer №2

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