Dynamically loading css file using javascript with callback without jQuery

mVChrU.Ahmad提出了一个问题:Dynamically loading css file using javascript with callback without jQuery,或许与您遇到的问题类似。

回答者Dmitry YaremenkomVChr给出了该问题的处理方式:

Unfortunately there is no onload support for stylesheets in most modern browsers. There is a solution I found with a little Googling.

Cited from: http://thudjs.tumblr.com/post/637855087/stylesheet-onload-or-lack-thereof

The basics

The most basic implementation of this can be done in a measely 30 lines of — framework independent — JavaScript code:

function loadStyleSheet( path, fn, scope ) {
   var head = document.getElementsByTagName( 'head' )[0], // reference to document.head for appending/ removing link nodes
       link = document.createElement( 'link' );           // create the link node
   link.setAttribute( 'href', path );
   link.setAttribute( 'rel', 'stylesheet' );
   link.setAttribute( 'type', 'text/css' );

   var sheet, cssRules;
// get the correct properties to check for depending on the browser
   if ( 'sheet' in link ) {
      sheet = 'sheet'; cssRules = 'cssRules';
   }
   else {
      sheet = 'styleSheet'; cssRules = 'rules';
   }

   var interval_id = setInterval( function() {                     // start checking whether the style sheet has successfully loaded
          try {
             if ( link[sheet] && link[sheet][cssRules].length ) { // SUCCESS! our style sheet has loaded
                clearInterval( interval_id );                      // clear the counters
                clearTimeout( timeout_id );
                fn.call( scope || window, true, link );           // fire the callback with success == true
             }
          } catch( e ) {} finally {}
       }, 10 ),                                                   // how often to check if the stylesheet is loaded
       timeout_id = setTimeout( function() {       // start counting down till fail
          clearInterval( interval_id );             // clear the counters
          clearTimeout( timeout_id );
          head.removeChild( link );                // since the style sheet didn't load, remove the link node from the DOM
          fn.call( scope || window, false, link ); // fire the callback with success == false
       }, 15000 );                                 // how long to wait before failing

   head.appendChild( link );  // insert the link node into the DOM and start loading the style sheet

   return link; // return the link node;
}

This would allow you to load a style sheet with an onload callback function like this:

loadStyleSheet( '/path/to/my/stylesheet.css', function( success, link ) {
   if ( success ) {
      // code to execute if the style sheet was loaded successfully
   }
   else {
      // code to execute if the style sheet failed to successfully
   }
} );

Or if you want to your callback to maintain its scope/ context, you could do something kind of like this:

loadStyleSheet( '/path/to/my/stylesheet.css', this.onComplete, this );

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