Loading External JavaScript files

Suppose this is our external javascript file content.

(customscript.js)

It consist of a simple function

function SayHello()
{
    alert(‘Hello World’);

}

 
It is placed at the following path   ..\ISV\ExtJS. i.e. within ExtJS folder inside ISV.
Place the following code in the form load of an entity’s form.
var scriptElement=document.createElement("<script type=’text/javascript’>");

        
scriptElement.src="/isv/ExtJs/customscript.js";

document.getElementsByTagName("head")[0].insertAdjacentElement("beforeEnd",scriptElement); 
SayHello();


At times, it would work properly however sometimes it would throw “Object expected” error. It is because browser load JavaScript files asynchronously. If the script isn’t loaded we would get the error.
So here we need to make use of onreadystatechange event. 
So we would modify our script as following 
 
var scriptElement=document.createElement("<script type=’text/javascript’>");

        
scriptElement.src="/isv/ExtJs/customscript.js"; 
scriptElement.attachEvent("onreadystatechange",loadScript); 
document.getElementsByTagName("head")[0].insertAdjacentElement("beforeEnd",scriptElement); 
function loadScript()

        
{ 
if(event.srcElement.readyState=="loaded" || event.srcElement.readState=="complete")

        
{ 
    SayHello();

        
}

}
 
 
Or we could also using XmlHttp request object to load the external file.
var url="/isv/ExtJs/customscript.js"; 
var xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");

        
xmlHttp.open("GET",url,false);

xmlHttp.send(); 
eval(xmlHttp.responseText); 
SayHello();
 
Bye..


	
	

	

	
	
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Author: Nishant Rana

		

			I love working in and sharing everything about Microsoft.NET technology !			
				View all posts by Nishant Rana