Execute a snippet of code only when the opacity of a div is set to 1

I'm facing a challenge with displaying multiple images on the same page in different groups. Some of these groups have hidden elements with opacity = 0, which are then set to opacity = 1 when they need to be shown.

The issue is that all images load at once, causing a heavy initial load (93Mb).

To address this problem, I want to dynamically load the images upon request along with the content of the specific divs containing them.

Initially, I tried using the following code:

if($('#id_of_div').css('opacity') == 1) {
    loadTheCode();
}
However, during my search for a solution, I came across Rory McCrossan's post on Stack Overflow from 2 years ago (load html after opacity = 0) where he shared the following jQuery function:

function cargarContenido(pagina) {
    $('#content').animate(
        { "opacity": "0" }, 
        function() {
            $("#loadimage").show(); // show a loading image
            // load content when opacity = 0 animation finishes
            $("#content").load(
                pagina, 
                function() {
                    $("#loadimage").hide(); // hide the loading image
                    // set opacity to 1 once content has been loaded
                    $('#content').animate({ "opacity": "1" });
                }
            )
        }
    );
}
I'm unsure about how exactly this jQuery function operates and how I can implement it to achieve my desired result.

Do the images also get loaded when this code runs?

Is there a way to make a MySQL request using PHP in this scenario?

I'm feeling a bit lost here :S Any guidance would be greatly appreciated!

Answer №1

jQuery is structured as a framework with function calls and callbacks that are triggered upon successful execution of the original function. Callbacks are widely used in jQuery to provide control over asynchronous events and actions.

Here is what the code does:

  1. It animates the content element in the DOM by changing its opacity property to 0. The duration defaults to 400ms if not specified (could have been a second argument).
  2. Following the animation, the callback function is called to display a loading placeholder (loadimage).
  3. The .load() function retrieves a URL stored in the variable pagina. Upon successful load event, another callback function for .load() is executed.
  4. This process then updates the innerHTML of the content element in the DOM.
  5. The loading image disappears and the content returns to full opacity in 400ms.

By utilizing this code, you can connect to a server endpoint created to fetch partial page content (potentially an internal API). This API would handle necessary database queries based on specific data payloads received (payloads can also be sent with the .load() call).

For more information, refer to the documentation here: .load(), .animate(), .show()

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