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Ajax Request Object Constructor

/ Published in: JavaScript
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  1. // ----------------------------------------
  2. // Wrapper function for constructing a request object.
  3. //	Parameters:
  4. //		reqType: The HTTP request type, such as GET or POST.
  5. //		url: The URL of the server program.
  6. //		asynch: Whether to send the request asynchronously or not.
  7. // ----------------------------------------
  8.  
  9. function httpRequest(reqType,url,asynch) {
  10.  
  11. 	// Mozilla-based browsers
  12. 	if (window.XMLHttpRequest) {
  13. 		request = new XMLHttpRequest();
  14. 	} else if (window.ActiveXObject) {
  15. 		request = new ActiveXObject("Msxml2.XMLHTTP");
  16. 		if (!request) {
  17. 			request = new ActiveXObject("Microsoft.XMLHTTP");
  18. 		}
  19. 	}
  20.  
  21. 	// Request could still be null if neither ActiveXObject
  22. 	//   initialization succeeded
  23. 	if (request) {
  24. 		initReq(reqType,url,asynch);
  25. 	} else {
  26. 		alert("Your browser does not permit the use of all " +
  27. 			"of this application's features!");
  28. 	}
  29.  
  30. }
  31.  
  32. // ----------------------------------------
  33. // Initialize a request object that is already constructed
  34. // ----------------------------------------
  35.  
  36. function initReq(reqType,url,asynch) {
  37. 	// Specify the function that will handle the HTTP response
  38. 	request.onreadystatechange = handleResponse;
  39. 	request.open(reqType,url,bool);
  40. 	request.send(null);
  41. }

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