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function initThemeChooser(settings) {
var isInitialized = false;
var currentThemeSystem; // don't set this directly. use setThemeSystem
var currentStylesheetEl;
var loadingEl = document.getElementById('loading');
var systemSelectEl = document.querySelector('#theme-system-selector select');
var themeSelectWrapEls = Array.prototype.slice.call( // convert to real array
document.querySelectorAll('.selector[data-theme-system]')
);
systemSelectEl.addEventListener('change', function() {
setThemeSystem(this.value);
});
setThemeSystem(systemSelectEl.value);
themeSelectWrapEls.forEach(function(themeSelectWrapEl) {
var themeSelectEl = themeSelectWrapEl.querySelector('select');
themeSelectWrapEl.addEventListener('change', function() {
setTheme(
currentThemeSystem,
themeSelectEl.options[themeSelectEl.selectedIndex].value
);
});
});
function setThemeSystem(themeSystem) {
var selectedTheme;
currentThemeSystem = themeSystem;
themeSelectWrapEls.forEach(function(themeSelectWrapEl) {
var themeSelectEl = themeSelectWrapEl.querySelector('select');
if (themeSelectWrapEl.getAttribute('data-theme-system') === themeSystem) {
selectedTheme = themeSelectEl.options[themeSelectEl.selectedIndex].value;
themeSelectWrapEl.style.display = 'inline-block';
} else {
themeSelectWrapEl.style.display = 'none';
}
});
setTheme(themeSystem, selectedTheme);
}
function setTheme(themeSystem, themeName) {
var stylesheetUrl = generateStylesheetUrl(themeSystem, themeName);
var stylesheetEl;
function done() {
if (!isInitialized) {
isInitialized = true;
settings.init(themeSystem);
}
else {
settings.change(themeSystem);
}
showCredits(themeSystem, themeName);
}
if (stylesheetUrl) {
stylesheetEl = document.createElement('link');
stylesheetEl.setAttribute('rel', 'stylesheet');
stylesheetEl.setAttribute('href', stylesheetUrl);
document.querySelector('head').appendChild(stylesheetEl);
loadingEl.style.display = 'inline';
whenStylesheetLoaded(stylesheetEl, function() {
if (currentStylesheetEl) {
currentStylesheetEl.parentNode.removeChild(currentStylesheetEl);
}
currentStylesheetEl = stylesheetEl;
loadingEl.style.display = 'none';
done();
});
} else {
if (currentStylesheetEl) {
currentStylesheetEl.parentNode.removeChild(currentStylesheetEl);
currentStylesheetEl = null
}
done();
}
}
function generateStylesheetUrl(themeSystem, themeName) {
if (themeSystem === 'bootstrap') {
if (themeName) {
return 'https://bootswatch.com/4/' + themeName + '/bootstrap.min.css';
}
else { // the default bootstrap theme
return 'https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css';
}
}
}
function showCredits(themeSystem, themeName) {
var creditId;
if (themeSystem.match('bootstrap')) {
if (themeName) {
creditId = 'bootstrap-custom';
}
else {
creditId = 'bootstrap-standard';
}
}
Array.prototype.slice.call( // convert to real array
document.querySelectorAll('.credits')
).forEach(function(creditEl) {
if (creditEl.getAttribute('data-credit-id') === creditId) {
creditEl.style.display = 'block';
} else {
creditEl.style.display = 'none';
}
})
}
function whenStylesheetLoaded(linkNode, callback) {
var isReady = false;
function ready() {
if (!isReady) { // avoid double-call
isReady = true;
callback();
}
}
linkNode.onload = ready; // does not work cross-browser
setTimeout(ready, 2000); // max wait. also handles browsers that don't support onload
}
}
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