add_dom_javascript

add_dom_javascript

function add_dom_javascript(scriptFile, callBackFunction, callBackParams)
{
    var fileAdded = false;
    
    var script = document.createElement('script');
	script.type = 'text/javascript';
	script.src = scriptFile;
    
    if ( (callBackFunction) && (arguments.length >= 2) )
    {
    	// loop through the addDomCallBacks array and determine if this file is already mentioned
    	for ( var i = 0; i < addDomCallBacks.length; i++ )
    	{
    		if ( addDomCallBacks[i].scriptSrc == scriptFile )
    		{
    			fileAdded = true;
    			
    			// if the file is already loaded, just run the callback function
    			if ( addDomCallBacks[i].loaded == true )
    			{
    				callBackFunction( callBackParams );
    			}
    			// otherwise add the callback to the array of callbacks
    			else
				{
					addDomCallBacks[i].callBackFunctions.push( callBackFunction );
					addDomCallBacks[i].callBackParams.push( callBackParams );
				}
    		}
    	}
    	
    	if ( fileAdded == false )
    	{
	    	// create an object referencing the callback function
	    	var callBackRef = {};
	    	callBackRef.scriptSrc = scriptFile;
	    	callBackRef.callBackFunctions = Array();
	    	callBackRef.callBackFunctions.push( callBackFunction );
	    	callBackRef.callBackParams = Array();
	    	callBackRef.callBackParams.push( callBackParams );
	    	callBackRef.loaded = false;
	    	
	    	addDomCallBacks.push(callBackRef); 
			
			var evl = {};
			evl.handleEvent = function(e) {
				addJavascriptCallBack( scriptFile );
			};
			
			if ( script.addEventListener )
			{
				script.addEventListener('load' ,evl ,true);
			}
			else // For IE
			{
				script.onreadystatechange = function() 
				{
				    if (this.readyState == "loaded" || this.readyState == "complete")
				    {
				    	addJavascriptCallBack.call( this, scriptFile );
				    }
				}
			}
		}
    }

	if ( fileAdded == false )
	{
		document.getElementsByTagName('head')[0].appendChild(script);	
	}
}