Can this jQuery window load script be converted into pure javascript? I was wrong, I didn't dive into pure javascript before learning about jQuery.
can you i convert this jquery to pure javascript?
This is my code
$(window).load(function () {
$("#loading").fadeOut("fast");
});
$(window).on("beforeunload", function () {
$("#loading").fadeIn("fast").delay(1000).show();
});
The load function can be replaced with onload (scrapping the window because onload is already a global variable) and the $ jquery query selector function is the same as document.querySelector. The on function is equivalent to the addEventListener function.
The pure js code is
onload = function () {
const elem = document.querySelector("#loading");
var opacity = 1;
var timer = setInterval(() => {
opacity -= 50 / 400;
if( opacity <= 0 )
{
clearInterval(timer);
opacity = 0;
elem.style.display = "none";
elem.style.visibility = "hidden";
}
elem.style.opacity = opacity;
elem.style.filter = "alpha(opacity=" + opacity * 100 + ")";
}, 50); // this part is from https://stackoverflow.com/questions/13733912/javascript-fade-in-fade-out-without-jquery-and-css3
};
addEventListener("beforeunload", function () {
const elem = document.querySelector("#loading");
elem.style.opacity = 0;
elem.style.filter = "alpha(opacity=0)";
elem.style.display = "inline-block";
elem.style.visibility = "visible";
var opacity = 0;
var timer = setInterval( function() {
opacity += 50 / 400;
if( opacity >= 1 )
{
clearInterval(timer);
opacity = 1;
}
elem.style.opacity = opacity;
elem.style.filter = "alpha(opacity=" + opacity * 100 + ")";
}, 50 ); // this part is also from https://stackoverflow.com/questions/13733912/javascript-fade-in-fade-out-without-jquery-and-css3
setTimeout(()=>{elem.style.display="block";},1000);
});
this all should match up to what jquery would do but something could always go wrong.
