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The best way to load external JavaScript

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function loadScript(url, callback){

    var script = document.createElement("script")
    script.type = "text/javascript";

    if (script.readyState){  //IE
        script.onreadystatechange = function(){
            if (script.readyState == "loaded" ||
                    script.readyState == "complete"){
                script.onreadystatechange = null;
                callback();
            }
        };
    } else {  //Others
        script.onload = function(){
            callback();
        };
    }

    script.src = url;
    document.getElementsByTagName("head")[0].appendChild(script);
}

posted @ martedì 18 agosto 2009 12:56

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# re: The best way to load external JavaScript

Left by LudovicoVan at 18/08/2009 15:11
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> When <script> tags are in the flow of an HTML document, the browser must stop rendering and wait for the script file to download and execute before continuing (example). Creating a new <script> tag via JavaScript avoids this issue because it’s out of the flow of the document

Non conosce JavaScript (pochi lo conoscono): gli script andrebbero "semplicemente" inclusi in fondo alla pagina, e il flusso di esecuzione impostato di conseguenza.

-LV
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