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Ajax getHTTPObject function

/ Published in: JavaScript
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This functions allows you to create a new XMLHTTPRequest, it checks to see if the browser supports each method, if not it returns false.

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  1. /*Usage
  2.  * var request = getHTTPObject();
  3.  * if(request){
  4.  * AJAX CODE HERE
  5.  * }
  6.  * 
  7.  * If getHTTPObject returns false, the browser isn't Ajax compatible. The if 
  8.  * statement checks to see if it exists, then runs the code.
  9.  */
  10. function getHTTPObject() {
  11. 	var xhr = false;//set to false, so if it fails, do nothing
  12. 	if(window.XMLHttpRequest) {//detect to see if browser allows this method
  13. 		var xhr = new XMLHttpRequest();//set var the new request
  14. 	} else if(window.ActiveXObject) {//detect to see if browser allows this method
  15. 		try {
  16. 			var xhr = new ActiveXObject("Msxml2.XMLHTTP");//try this method first
  17. 		} catch(e) {//if it fails move onto the next
  18. 			try {
  19. 				var xhr = new ActiveXObject("Microsoft.XMLHTTP");//try this method next
  20. 			} catch(e) {//if that also fails return false.
  21. 				xhr = false;
  22. 			}
  23. 		}
  24. 	}
  25. 	return xhr;//return the value of xhr
  26. }

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