request-data.js

来自「这是《JavaScript学习源代码》一书的源代码」· JavaScript 代码 · 共 40 行

/* 

This example must be run from a web server... for example by uploading to your ISP and viewed over the web, or placing the source files in the web pages directory of a web server on your own system and viewed by entering http://localhost/http-request.html in your browser address field - assuming your server alias is "localhost" as usual.

*/

// specify an ONLOAD event-handler
window.onload=make_request

var http_request = false;								// global variable for HTTPRequest									
// function to request data from a specified url...
function make_request()									// execute an HTTPRequest 
{								
	if (window.XMLHttpRequest)							// create an HTTPRequest object...	
	{										// for IE7, Mozilla, Safari ...
		http_request = new XMLHttpRequest();				
	}
	else if (window.ActiveXObject)							// or create an HTTPRequest object...
	{										// for Internet Explorer 6...
		http_request = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else return false;								// or quit...

	http_request.open("GET", "data.xml", true);					// make the request to the server...
        http_request.send(null);							// stating method, filename, async

}


function reveal(n)
{
  if((http_request.readyState == 4) && (http_request.status == 200) && (n != 0))			// if complete and OK
  {
    var obj = http_request.responseXML; 
    var fname = obj.getElementsByTagName("name")[n-1].firstChild.data;
    var sname = obj.getElementsByTagName("fmly")[n-1].firstChild.data;
    window.document.getElementById("cell").innerHTML = 
			n + " " + fname + " " + sname;
   }
}