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remove head.min.js in favor of simple built-in script loader

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This commit is contained in:
Hakim El Hattab
2018-10-04 14:48:01 +02:00
parent d5cf3fa13c
commit 29b0e86089
22 changed files with 200 additions and 42 deletions
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90
js/reveal.js
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@ -436,41 +436,28 @@
scriptsToPreload = 0;
// Called once synchronous scripts finish loading
function proceed() {
function afterSynchronousScriptsLoaded() {
// Load asynchronous scripts
if( scriptsAsync.length ) {
// Load asynchronous scripts
head.js.apply( null, scriptsAsync );
scriptsAsync.forEach( function( s ) {
loadScript( s.src, s.callback );
} );
}
start();
}
function loadScript( s ) {
head.ready( s.src.match( /([\w\d_\-]*)\.?js(\?[\w\d.=&]*)?$|[^\\\/]*$/i )[0], function() {
// Extension may contain callback functions
if( typeof s.callback === 'function' ) {
s.callback.apply( this );
}
if( --scriptsToPreload === 0 ) {
proceed();
}
});
}
for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
var s = config.dependencies[i];
// Load if there's no condition or the condition is truthy
if( !s.condition || s.condition() ) {
if( s.async ) {
scriptsAsync.push( s.src );
scriptsAsync.push( s );
}
else {
scripts.push( s.src );
scripts.push( s );
}
loadScript( s );
}
}
@ -478,14 +465,73 @@
scriptsToPreload = scripts.length;
// Load synchronous scripts
head.js.apply( null, scripts );
scripts.forEach( function( s ) {
loadScript( s.src, function() {
if( typeof s.callback === 'function' ) s.callback();
if( --scriptsToPreload === 0 ) {
afterSynchronousScriptsLoaded();
}
} );
} );
}
else {
proceed();
afterSynchronousScriptsLoaded();
}
}
/**
* Loads a JavaScript file from the given URL and executes it.
*
* @param {string} url Address of the .js file to load
* @param {function} callback Method to invoke when the script
* has loaded and executed
*/
function loadScript( url, callback ) {
var script = document.createElement( 'script' );
script.type = 'text/javascript';
script.async = false;
script.defer = false;
script.src = url;
if( callback ) {
// Success callback
script.onload = script.onreadystatechange = function( event ) {
if( event.type === "load" || (/loaded|complete/.test( script.readyState ) ) ) {
// Kill event listeners
script.onload = script.onreadystatechange = script.onerror = null;
callback();
}
};
// Error callback
script.onerror = function( err ) {
// Kill event listeners
script.onload = script.onreadystatechange = script.onerror = null;
callback( new Error( 'Failed loading script: ' + script.src + '\n' + err) );
};
}
// Append the script at the end of <head>
var head = document.querySelector( 'head' );
head.insertBefore( script, head.lastChild );
}
/**
* Starts up reveal.js by binding input events and navigating
* to the current URL deeplink if there is one.