How to display an error without an alert box using JavaScript?
In this article, we will learn how to display errors inline on the page without showing an alert box using javascript with the help of innerHTML and textContent properties of HTML DOM elements.
While alert boxes are useful for displaying errors to users, they can be disruptive and interrupt the user experience. A more elegant solution is to display the error inline on the page.
Let’s understand how to achieve the above result by two methods
method 1
In this approach, we will use the innerHTML DOM element attribute to display the error message inline in the form.
Example
Let us understand the above method through an example.
File name: index.html
<html lang="en">
<head>
<title>How to display error without alert box using JavaScript?</title>
<style>
span {
color: red;
}
</style>
</head>
<body>
<h3>How to display error without alert box using JavaScript?</h3>
<form name="myForm" onsubmit="return validateForm()">
<label for="name">Name:</label>
<input type="text" id="name" name="name"><br>
<span id="nameError"></span><br>
<input type="submit" value="Submit">
</form>
<script>
function validateForm() {
var name = document.forms["myForm"]["name"].value;
if (name == "") {
document.getElementById("nameError").innerHTML = "Please enter your name";
return false;
}
}
</script>
</body>
</html>
Method 2
In this method, we will use 3 different methods to display error messages, which involves using inline error messages, CSS styles, classList, and setAttributes methods.
Example
Let us understand the above method through an example.
File name: index.html
<html lang="en">
<head>
<title>How to display error without alert box using JavaScript?</title>
<style>
.error {
color: red;
}
</style>
</head>
<body>
<h3>How to display error without alert box using JavaScript?</h3>
<form name="myForm" onsubmit="return validateForm()">
<label for="name">Name:</label>
<input type="text" id="name" name="name"><br>
<span id="nameError"></span><br>
<input type="submit" value="Submit">
</form>
<script>
// Method 1: Using inline error messages
function validateForm() {
var name = document.forms["myForm"]["name"].value;
if (name == "") {
document.getElementById("nameError").innerHTML = "Please enter your name";
return false;
}
}
// Method 2: Using CSS styling
function validateForm() {
var name = document.forms["myForm"]["name"].value;
if (name == "") {
document.getElementById("nameError").textContent = "Please enter your name";
document.getElementById("nameError").style.color = "red";
return false;
}
}
// Method 3: Using classList
function validateForm() {
var name = document.forms["myForm"]["name"].value;
if (name == "") {
document.getElementById("nameError").textContent = "Please enter your name";
document.getElementById("nameError").classList.add("error");
return false;
}
}
// Method 4: Using setAttribute
function validateForm() {
var name = document.forms["myForm"]["name"].value;
if (name == "") {
document.getElementById("nameError").textContent = "Please enter your name";
document.getElementById("nameError").setAttribute("style", "color: red;");
return false;
}
}
</script>
</body>
</html>
in conclusion
By displaying errors inline on the page rather than using an alert box, you can provide the user with a more elegant and user-friendly experience. In this article, we learned how to display error message inline and without showing alert box using javascript with the help of 2 methods. We use innerHTML, textContent and innerText properties respectively to achieve the desired result.
The above is the detailed content of How to display an error without an alert box using JavaScript?. For more information, please follow other related articles on the PHP Chinese website!
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