Question

I am using the following JavaScript code and I am trying to find out once the file has been downloaded and added to the header of my page:

function loadjscssfile(filename, filetype)
{
    if (filetype=="js"){ //if filename is a external JavaScript file
        var fileref=document.createElement('script')
            fileref.setAttribute("type","text/javascript")
            fileref.setAttribute("src", filename)
    }
    else if (filetype=="css"){ //if filename is an external CSS file
        var fileref=document.createElement("link")
            fileref.setAttribute("rel", "stylesheet")
            fileref.setAttribute("type", "text/css")
            fileref.setAttribute("href", filename)
    }
    if (typeof fileref!="undefined")
        document.getElementsByTagName("head")[0].appendChild(fileref)
}



loadjscssfile("jquery.js","js");

I normally use the following code to find out once my image has loaded:

    document.getElementById("header_logo").src = "logo.png"; // load top logo

var header_logo = document.getElementById("header_logo"); 
    header_logo.onload = function(e) {  
    // do something here, the file has loaded
}

but I can’t work out how to check once my JS has been loaded..

Any ideas?

(I can’t use jQuery.)

Answer 1

You could add a function to the onload event:

function loadjscssfile(filename, filetype, onload) {
    //if filename is a external JavaScript file
    if (filetype == "js") { 
        var fileref = document.createElement('script');
        fileref.type = "text/javascript");
        fileref.onload = onload;
        fileref.src = filename);
        document.getElementsByTagName("head")[0].appendChild(fileref);
        return;
    }

    //if filename is an external CSS file
    if (filetype == "css") { 
        var fileref = document.createElement("link");
        fileref.rel = "stylesheet";
        fileref.type = "text/css";
        fileref.onload = onload;
        fileref.href = filename;
        document.getElementsByTagName("head")[0].appendChild(fileref);
        return;
    }
}



loadjscssfile("jquery.js","js", function() { alert(this.src); });