345
/** Writes a JSONable object to the cookie under a particular key
346
* (JSON encoded and URL encoded).
348
function write_cookie(key, value)
350
var sendstr = encodeURIComponent(key) + "="
351
+ encodeURIComponent(JSON.stringify(value))
352
+ "; path=" + urlencode_path(root_dir);
353
/* This actually just assigns to the key, not replacing the whole cookie
354
* as it appears to. */
355
document.cookie = sendstr;
357
/** Reads a cookie which has a JSONable object encoded as its value.
358
* Returns the object, parsed from JSON.
360
function read_cookie(key)
362
var cookies = document.cookie.split(";");
363
var checkstart = encodeURIComponent(key) + "=";
364
var checklen = checkstart.length;
365
for (var i=0; i<cookies.length; i++)
367
var cookie = cookies[i];
368
while (cookie[0] == ' ')
369
cookie = cookie.substr(1);
370
if (cookie.substr(0, checklen) == checkstart)
372
var valstr = cookie.substr(checklen);
373
valstr = decodeURIComponent(valstr);
374
return JSON.parse(valstr);
379
346
/** Given an argument map, as output in the args parameter of the return of
380
347
* parseurl, gets the first occurence of an argument in the URL string.
381
348
* If the argument was not found, returns null.
559
521
arr.splice(j, i-j);
562
/** Shallow-clones an object */
563
function shallow_clone_object(obj)
571
/** Returns a new XMLHttpRequest object, in a somewhat browser-agnostic
574
function new_xmlhttprequest()
579
return new XMLHttpRequest();
583
/* Internet Explorer */
586
return new ActiveXObject("Msxml2.XMLHTTP");
592
return new ActiveXObject("Microsoft.XMLHTTP");
596
throw("Your browser does not support AJAX. "
597
+ "IVLE requires a modern browser.");
603
/** Creates a random string of length length,
604
* consisting of alphanumeric characters.
606
var rand_chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZ"
607
+ "abcdefghiklmnopqrstuvwxyz";
608
function random_string(length)
610
var str = Array(length);
612
for (var i=0; i<length; i++)
614
v = Math.floor(Math.random() * rand_chars.length);
615
str[i] = rand_chars.charAt(v);
620
/** Makes an XMLHttpRequest call to the server.
621
* Sends the XMLHttpRequest object containing the completed response to a
622
* specified callback function.
524
/** Makes an XMLHttpRequest call to the server. Waits (synchronously) for a
525
* response, and returns an XMLHttpRequest object containing the completed
624
* \param callback A callback function. Will be called when the response is
625
* complete. Passed 1 parameter, an XMLHttpRequest object containing the
626
* completed response. If callback is null this is a syncronous request
627
* otherwise this is an asynchronous request.
628
528
* \param app IVLE app to call (such as "fileservice").
629
529
* \param path URL path to make the request to, within the application.
630
530
* \param args Argument object, as described in parse_url and friends.
631
* \param method String; "GET", "POST", "PUT", or "PATCH"
632
* \param content_type String, optional.
531
* \param method String; "GET" or "POST"
532
* \param content_type String, optional. Only applies if method is "POST".
533
* May be "application/x-www-form-urlencoded" or "multipart/form-data".
633
534
* Defaults to "application/x-www-form-urlencoded".
535
* \return An XMLHttpRequest object containing the completed response.
635
function ajax_call(callback, app, path, args, method, content_type)
537
function ajax_call(app, path, args, method, content_type)
539
if (content_type != "multipart/form-data")
638
540
content_type = "application/x-www-form-urlencoded";
639
541
path = app_path(app, path);
641
543
/* A random string, for multipart/form-data
642
544
* (This is not checked against anywhere else, it is solely defined and
643
545
* used within this function) */
644
var boundary = random_string(20);
645
var xhr = new_xmlhttprequest();
646
var asyncronous = callback != null;
649
xhr.onreadystatechange = function()
651
if (xhr.readyState == 4)
546
var boundary = "48234n334nu7n4n2ynonjn234t683jyh80j";
547
var xhr = new XMLHttpRequest();
657
548
if (method == "GET")
659
550
/* GET sends the args in the URL */
660
551
url = build_url({"path": path, "args": args});
661
/* open's 3rd argument = true -> asynchronous */
662
xhr.open(method, url, asyncronous);
552
/* open's 3rd argument = false -> SYNCHRONOUS (wait for response)
553
* (No need for a callback function) */
554
xhr.open(method, url, false);
667
/* POST & PUT & PATCH sends the args in the request body */
668
url = urlencode_path(path);
669
xhr.open(method, url, asyncronous);
559
/* POST sends the args in application/x-www-form-urlencoded */
560
url = encodeURI(path);
561
xhr.open(method, url, false);
671
563
if (content_type == "multipart/form-data")
673
565
xhr.setRequestHeader("Content-Type",
674
"multipart/form-data; boundary=" + boundary);
566
"multipart/form-data, boundary=" + boundary);
675
567
message = make_multipart_formdata(args, boundary);
677
else if (content_type == "application/x-www-form-urlencoded")
679
571
xhr.setRequestHeader("Content-Type", content_type);
680
572
message = make_query_string(args);
682
else if (content_type == "application/json")
684
xhr.setRequestHeader("Content-Type", content_type);
685
message = JSON.stringify(args);
689
xhr.setRequestHeader("Content-Type", content_type);
692
574
xhr.send(message);
694
/* Only return the XHR for syncronous requests */
701
/** Attempts to JSON decodes a response object
702
* If a non-200 response or the JSON decode fails then returns null
704
function decode_response(response)
706
if (response.status == 200)
710
var responseText = response.responseText;
711
return JSON.parse(responseText);