jQuery Effect fadeIn() Method

The fade-in effect is a visual transition where an element gradually becomes more visible from being initially hidden or transparent. It smoothly increases the opacity of the element over a specified duration, creating a smooth transition.

The fadeIn() method is used in jQuery to make a hidden element visible by fading them in over a specified duration. It animates the opacity of the selected elements from 0 to 1, making them visible.

This method can also be used together with "fadeOut()" method.

Syntax

Following is the syntax of fadeIn() method in jQuery −

$(selector).fadeIn(speed,easing,callback)

Parameters

This method accepts the following optional parameters −

speed (optional): A string or number determining how long the animation will run. It can take values like "slow", "fast", or a specific duration in milliseconds (e.g., 1000 for 1 second).
easing (optional): A string specifying the easing function to use for the animation (e.g., "swing" or "linear").
callback (optional): A function to call once the animation is complete. It's executed for each selected element.

Example 1

In the following example, we are using the JavaScript fadeIn() method to add a "slow" fade in effect on a <div> element −

<html>
<head>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
$(document).ready(function() {
    $("#fadeButton").click(function() {
        $("#content").fadeIn("slow");
    });
});
</script>
</head>
<body>

<button id="fadeButton">Click me!</button>
<div id="content" style="display: none;">
    <h2>Welcome to Tutorialspoint</h2>
    <p>This text will fade in when the button is clicked.</p>
</div>
</body>
</html>

If we click on the button, the <div> element will fade in.

Example 2

In this example, the <div> element automatically fades in when the page loads −

<html>
<head>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
$(document).ready(function() {
    $("#content").fadeIn("slow");
});
</script>
</head>
<body>

<div id="content" style="display: none;">
    <h2>Welcome to Tutorialspoint!</h2>
    <p>This content fades in automatically when the page loads.</p>
</div>
</body>
</html>

If we execute the above program, the content of <div> element will fade in automatically.

Example 3

The following example fades in multiple elements one after the other −

<html>
<head>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
$(document).ready(function() {
    $("#fadeButton").click(function() {
        $(".content").each(function(index) {
            $(this).delay(500 * index).fadeIn("slow");
        });
    });
});
</script>
</head>
<body>

<button id="fadeButton">Click me!</button>
<div class="content" style="display: none;">
    <h2>First Element</h2>
</div>
<div class="content" style="display: none;">
    <h2>Second Element</h2>
</div>
<div class="content" style="display: none;">
    <h2>Third Element</h2>
</div>
</body>
</html>

If we click on the button, all the three <div> elements will fade in.

Example 4

In the below example, we are using both fadeIn() and fadeOut() methods together to create a simple toggle effect −

<html>
<head>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
$(document).ready(function() {
    $("#toggleButton").click(function() {
        $("#content").fadeOut("slow", function() {
            // Fade out complete callback
            $("#content").fadeIn("slow");
        });
    });
});
</script>
</head>
<body>

<button id="toggleButton">Click me!</button>
<div id="content">
    <h2>Welcome to Tutorialspoint!</h2>
</div>
</body>
</html>

The <div> element will fade out and then fade back in when the button is clicked.

jquery_ref_effects.htm

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