Is it possible to alter the ‘Loading screen’ script, to mimic a old school GIF, or more recently a JS carousel?
Could be nice for one of my projects, if the preloader had multiple images.
Yes you can. You can even use a GIF. Bear in mind that you don’t want your loading screen to add to what the users needs to download by too much.
ok, well I guess I mean the ladder … the ‘.png’ at example is easily exchanged with ‘.jpg’ or (yes) ‘.gif’.
More interested in a coded carousel/or slides - the specific chunk:
var setProgress = function (value) {
var bar = document.getElementById('progress-bar');
if(bar) {
value = Math.min(1, Math.max(0, value));
bar.style.width = value * 100 + '%';
}
};
- can I access the ‘value’ at ‘setProgress’, in order to ‘if(){}’ the progress?
I’m not sure what you mean? You can put extra code in setProgress and change the image based on the value of value
.
Ok, but in such case this does not work:
pc.script.createLoadingScreen(function (app) {
var showSplash = function () {
// splash wrapper
var wrapper = document.createElement('div');
wrapper.id = 'application-splash-wrapper';
document.body.appendChild(wrapper);
// splash
var splash = document.createElement('div');
splash.id = 'application-splash';
wrapper.appendChild(splash);
splash.style.display = 'none';
var logo = document.createElement('img');
logo.src = 'https://s3-eu-west-1.amazonaws.com/static.playcanvas.com/images/play_text_252_white.png';
splash.appendChild(logo);
logo.onload = function () {
splash.style.display = 'block';
};
var container = document.createElement('div');
container.id = 'progress-bar-container';
splash.appendChild(container);
var bar = document.createElement('div');
bar.id = 'progress-bar';
container.appendChild(bar);
};
var showSplash2 = function () {
// splash wrapper
var wrapper = document.createElement('div');
wrapper.id = 'application-splash-wrapper2';
document.body.appendChild(wrapper);
// splash
var splash = document.createElement('div');
splash.id = 'application-splash2';
wrapper.appendChild(splash);
splash.style.display = 'none';
var logo = document.createElement('img2');
logo.src = 'https://amfibios.dk/Armbroest_01.png';
splash.appendChild(logo);
logo.onload = function () {
splash.style.display = 'block';
};
var container = document.createElement('div');
container.id = 'progress-bar-container2';
splash.appendChild(container);
var bar = document.createElement('div');
bar.id = 'progress-bar2';
container.appendChild(bar);
};
var hideSplash = function () {
var splash = document.getElementById('application-splash-wrapper');
splash.parentElement.removeChild(splash);
};
var setProgress = function (value) {
if(value>50) {alert("Alert it");
hideSplash(); createCss();
showSplash2();
}
var bar = document.getElementById('progress-bar');
if(bar) {
value = Math.min(1, Math.max(0, value));
bar.style.width = value * 100 + '%';
}
};
var createCss = function () {
var css = [
'body {',
' background-color: #283538;',
'}',
'#application-splash-wrapper {',
' position: absolute;',
' top: 0;',
' left: 0;',
' height: 100%;',
' width: 100%;',
' background-color: #283538;',
'}',
'#application-splash {',
' position: absolute;',
' top: calc(50% - 28px);',
' width: 264px;',
' left: calc(50% - 132px);',
'}',
'#application-splash img {',
' width: 100%;',
'}',
'#progress-bar-container {',
' margin: 20px auto 0 auto;',
' height: 2px;',
' width: 100%;',
' background-color: #1d292c;',
'}',
'#progress-bar {',
' width: 0%;',
' height: 100%;',
' background-color: #f60;',
'}',
'@media (max-width: 480px) {',
' #application-splash {',
' width: 170px;',
' left: calc(50% - 85px);',
' }',
'#application-splash-wrapper2 {',
' position: absolute;',
' top: 0;',
' left: 0;',
' height: 100%;',
' width: 100%;',
' background-color: #283538;',
'}',
'#application-splash2 {',
' position: absolute;',
' top: calc(50% - 28px);',
' width: 264px;',
' left: calc(50% - 132px);',
'}',
'#application-splash2 img2 {',
' width: 100%;',
'}',
'#progress-bar-container2 {',
' margin: 20px auto 0 auto;',
' height: 2px;',
' width: 100%;',
' background-color: #1d292c;',
'}',
'#progress-bar2 {',
' width: 0%;',
' height: 100%;',
' background-color: #f60;',
'}',
'@media (max-width: 480px) {',
' #application-splash2 {',
' width: 170px;',
' left: calc(50% - 85px);',
' }',
'}'
].join("\n");
var style = document.createElement('style');
style.type = 'text/css';
if (style.styleSheet) {
style.styleSheet.cssText = css;
} else {
style.appendChild(document.createTextNode(css));
}
document.head.appendChild(style);
};
createCss();
showSplash();
app.on('preload:end', function () {
app.off('preload:progress');
});
app.on('preload:progress', setProgress);
app.on('start', hideSplash);
});
The value is between 0 and 1
Fine, it works
(ps: the value between 0 and 1, … fetched from github-engine codes? - not in the webpage source: https://developer.playcanvas.com/en/user-manual/designer/loading-screen/)
The value is passed from the engine via an event.
You can see the event being subscribed to here in the script:
app.on("preload:progress", setProgress);
In the function setProgress:
var setProgress = function (value) {
var bar = document.getElementById('progress-bar');
if(bar) {
value = Math.min(1, Math.max(0, value));
bar.style.width = value * 100 + '%';
}
};
The code is implying that it’s a value between 0 and 1 because of this line:
value = Math.min(1, Math.max(0, value));
The value is being clamped between 0 and 1.