Execute javascript function upon user scrolling to a designated section in the webpage

Is there a method to trigger a unique function every time a user scrolls to a different div or section of the page?

Answer №1

This question has already been answered here: How to Implement Dynamic Scroll Position in Jquery

If you're looking for a solution, I recommend using the plugin called WAYPOINT

I've created an example on jsfiddle, feel free to check it out

HTML

<div class="first"></div>
<div class="second"></div>

CSS

.first {
    background:green;
    height: 600px;
    width:100%;
}
.second {
    background:red;
    height: 600px;
    width:100%;
}

JS

$('.second').waypoint(function() {
    alert('You have reached a new entry.');
}, {
    offset: '100%'
});

Answer №2

There are numerous approaches to accomplish this task. One of the simplest methods is as follows:

var targetElement = $('#my-div');

function displayAlert() {
    alert('I am here!');
}

$(window).scroll(function(){
    var viewportTop = $(window).scrollTop();
    var viewportBottom = viewportTop + $(window).height();

    var elementTop = $(targetElement).offset().top;
    var elementBottom = elementTop + $(targetElement).height();

    if ((elementBottom <= viewportBottom) && (elementTop >= viewportTop)) {
        displayAlert();
    }
});

Alternatively, you can utilize the jQuery Appear plugin or the Waypoints plugin:

$('#my-div').appear(function() {
    alert('I am here!');
});

$('#my-div').waypoint(function() {
    alert('I am here!');
});

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