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/**
* JsHttpRequest: JavaScript "AJAX" data loader
*
* @license LGPL
* @author Dmitry Koterov, http://en.dklab.ru/lib/JsHttpRequest/
* @version 5.x $Id$
*/
// {{{
function JsHttpRequest() {
// Standard properties.
var t = this;
t.onreadystatechange = null;
t.readyState = 0;
t.responseText = null;
t.responseXML = null;
t.status = 200;
t.statusText = "OK";
// JavaScript response array/hash
t.responseJS = null;
// Additional properties.
t.caching = false; // need to use caching?
t.loader = null; // loader to use ('form', 'script', 'xml'; null - autodetect)
t.session_name = "PHPSESSID"; // set to SID cookie or GET parameter name
// Internals.
t._ldObj = null; // used loader object
t._reqHeaders = []; // collected request headers
t._openArgs = null; // parameters from open()
t._errors = {
inv_form_el: 'Invalid FORM element detected: name=%, tag=%',
must_be_single_el: 'If used, <form> must be a single HTML element in the list.',
js_invalid: 'JavaScript code generated by backend is invalid!\n%',
url_too_long: 'Cannot use so long query with GET request (URL is larger than % bytes)',
unk_loader: 'Unknown loader: %',
no_loaders: 'No loaders registered at all, please check JsHttpRequest.LOADERS array',
no_loader_matched: 'Cannot find a loader which may process the request. Notices are:\n%'
}
/**
* Aborts the request. Behaviour of this function for onreadystatechange()
* is identical to IE (most universal and common case). E.g., readyState -> 4
* on abort() after send().
*/
t.abort = function() { with (this) {
if (_ldObj && _ldObj.abort) _ldObj.abort();
_cleanup();
if (readyState == 0) {
// start->abort: no change of readyState (IE behaviour)
return;
}
if (readyState == 1 && !_ldObj) {
// open->abort: no onreadystatechange call, but change readyState to 0 (IE).
// send->abort: change state to 4 (_ldObj is not null when send() is called)
readyState = 0;
return;
}
_changeReadyState(4, true); // 4 in IE & FF on abort() call; Opera does not change to 4.
}}
/**
* Prepares the object for data loading.
* You may also pass URLs like "GET url" or "script.GET url".
*/
t.open = function(method, url, asyncFlag, username, password) { with (this) {
// Extract methor and loader from the URL (if present).
if (url.match(/^((\w+)\.)?(GET|POST)\s+(.*)/i)) {
this.loader = RegExp.$2? RegExp.$2 : null;
method = RegExp.$3;
url = RegExp.$4;
}
// Append SID to original URL. Use try...catch for security problems.
try {
if (
document.location.search.match(new RegExp('[&?]' + session_name + '=([^&?]*)'))
|| document.cookie.match(new RegExp('(?:;|^)\\s*' + session_name + '=([^;]*)'))
) {
url += (url.indexOf('?') >= 0? '&' : '?') + session_name + "=" + this.escape(RegExp.$1);
}
} catch (e) {}
// Store open arguments to hash.
_openArgs = {
method: (method || '').toUpperCase(),
url: url,
asyncFlag: asyncFlag,
username: username != null? username : '',
password: password != null? password : ''
}
_ldObj = null;
_changeReadyState(1, true); // compatibility with XMLHttpRequest
return true;
}}
/**
* Sends a request to a server.
*/
t.send = function(content) {
if (!this.readyState) {
// send without open or after abort: no action (IE behaviour).
return;
}
this._changeReadyState(1, true); // compatibility with XMLHttpRequest
this._ldObj = null;
// Prepare to build QUERY_STRING from query hash.
var queryText = [];
var queryElem = [];
if (!this._hash2query(content, null, queryText, queryElem)) return;
// Solve the query hashcode & return on cache hit.
var hash = null;
if (this.caching && !queryElem.length) {
hash = this._openArgs.username + ':' + this._openArgs.password + '@' + this._openArgs.url + '|' + queryText + "#" + this._openArgs.method;
var cache = JsHttpRequest.CACHE[hash];
if (cache) {
this._dataReady(cache[0], cache[1]);
return false;
}
}
// Try all the loaders.
var loader = (this.loader || '').toLowerCase();
if (loader && !JsHttpRequest.LOADERS[loader]) return this._error('unk_loader', loader);
var errors = [];
var lds = JsHttpRequest.LOADERS;
for (var tryLoader in lds) {
var ldr = lds[tryLoader].loader;
if (!ldr) continue; // exclude possibly derived prototype properties from "for .. in".
if (loader && tryLoader != loader) continue;
// Create sending context.
var ldObj = new ldr(this);
JsHttpRequest.extend(ldObj, this._openArgs);
JsHttpRequest.extend(ldObj, {
queryText: queryText.join('&'),
queryElem: queryElem,
id: (new Date().getTime()) + "" + JsHttpRequest.COUNT++,
hash: hash,
span: null
});
var error = ldObj.load();
if (!error) {
// Save loading script.
this._ldObj = ldObj;
JsHttpRequest.PENDING[ldObj.id] = this;
return true;
}
if (!loader) {
errors[errors.length] = '- ' + tryLoader.toUpperCase() + ': ' + this._l(error);
} else {
return this._error(error);
}
}
// If no loader matched, generate error message.
return tryLoader? this._error('no_loader_matched', errors.join('\n')) : this._error('no_loaders');
}
/**
* Returns all response headers (if supported).
*/
t.getAllResponseHeaders = function() { with (this) {
return _ldObj && _ldObj.getAllResponseHeaders? _ldObj.getAllResponseHeaders() : [];
}}
/**
* Returns one response header (if supported).
*/
t.getResponseHeader = function(label) { with (this) {
return _ldObj && _ldObj.getResponseHeader? _ldObj.getResponseHeader(label) : null;
}}
/**
* Adds a request header to a future query.
*/
t.setRequestHeader = function(label, value) { with (this) {
_reqHeaders[_reqHeaders.length] = [label, value];
}}
//
// Internal functions.
//
/**
* Do all the work when a data is ready.
*/
t._dataReady = function(text, js) { with (this) {
if (caching && _ldObj) JsHttpRequest.CACHE[_ldObj.hash] = [text, js];
responseText = responseXML = text;
responseJS = js;
if (js !== null) {
status = 200;
statusText = "OK";
} else {
status = 500;
statusText = "Internal Server Error";
}
_changeReadyState(2);
_changeReadyState(3);
_changeReadyState(4);
_cleanup();
}}
/**
* Analog of sprintf(), but translates the first parameter by _errors.
*/
t._l = function(args) {
var i = 0, p = 0, msg = this._errors[args[0]];
// Cannot use replace() with a callback, because it is incompatible with IE5.
while ((p = msg.indexOf('%', p)) >= 0) {
var a = args[++i] + "";
msg = msg.substring(0, p) + a + msg.substring(p + 1, msg.length);
p += 1 + a.length;
}
return msg;
}
/**
* Called on error.
*/
t._error = function(msg) {
msg = this._l(typeof(msg) == 'string'? arguments : msg)
msg = "JsHttpRequest: " + msg;
if (!window.Error) {
// Very old browser...
throw msg;
} else if ((new Error(1, 'test')).description == "test") {
// We MUST (!!!) pass 2 parameters to the Error() constructor for IE5.
throw new Error(1, msg);
} else {
// Mozilla does not support two-parameter call style.
throw new Error(msg);
}
}
/**
* Convert hash to QUERY_STRING.
* If next value is scalar or hash, push it to queryText.
* If next value is form element, push [name, element] to queryElem.
*/
t._hash2query = function(content, prefix, queryText, queryElem) {
if (prefix == null) prefix = "";
if((''+typeof(content)).toLowerCase() == 'object') {
var formAdded = false;
if (content && content.parentNode && content.parentNode.appendChild && content.tagName && content.tagName.toUpperCase() == 'FORM') {
content = { form: content };
}
for (var k in content) {
var v = content[k];
if (v instanceof Function) continue;
var curPrefix = prefix? prefix + '[' + this.escape(k) + ']' : this.escape(k);
var isFormElement = v && v.parentNode && v.parentNode.appendChild && v.tagName;
if (isFormElement) {
var tn = v.tagName.toUpperCase();
if (tn == 'FORM') {
// FORM itself is passed.
formAdded = true;
} else if (tn == 'INPUT' || tn == 'TEXTAREA' || tn == 'SELECT') {
// This is a single form elemenent.
} else {
return this._error('inv_form_el', (v.name||''), v.tagName);
}
queryElem[queryElem.length] = { name: curPrefix, e: v };
} else if (v instanceof Object) {
this._hash2query(v, curPrefix, queryText, queryElem);
} else {
// We MUST skip NULL values, because there is no method
// to pass NULL's via GET or POST request in PHP.
if (v === null) continue;
// Convert JS boolean true and false to corresponding PHP values.
if (v === true) v = 1;
if (v === false) v = '';
queryText[queryText.length] = curPrefix + "=" + this.escape('' + v);
}
if (formAdded && queryElem.length > 1) {
return this._error('must_be_single_el');
}
}
} else {
queryText[queryText.length] = content;
}
return true;
}
/**
* Remove last used script element (clean memory).
*/
t._cleanup = function() {
var ldObj = this._ldObj;
if (!ldObj) return;
// Mark this loading as aborted.
JsHttpRequest.PENDING[ldObj.id] = false;
var span = ldObj.span;
if (!span) return;
// Do NOT use iframe.contentWindow.back() - it is incompatible with Opera 9!
ldObj.span = null;
var closure = function() {
span.parentNode.removeChild(span);
}
// IE5 crashes on setTimeout(function() {...}, ...) construction! Use tmp variable.
JsHttpRequest.setTimeout(closure, 50);
}
/**
* Change current readyState and call trigger method.
*/
t._changeReadyState = function(s, reset) { with (this) {
if (reset) {
status = statusText = responseJS = null;
responseText = '';
}
readyState = s;
if (onreadystatechange) onreadystatechange();
}}
/**
* JS escape() does not quote '+'.
*/
t.escape = function(s) {
return escape(s).replace(new RegExp('\\+','g'), '%2B');
}
}
// Global library variables.
JsHttpRequest.COUNT = 0; // unique ID; used while loading IDs generation
JsHttpRequest.MAX_URL_LEN = 2000; // maximum URL length
JsHttpRequest.CACHE = {}; // cached data
JsHttpRequest.PENDING = {}; // pending loadings
JsHttpRequest.LOADERS = {}; // list of supported data loaders (filled at the bottom of the file)
JsHttpRequest._dummy = function() {}; // avoid memory leaks
/**
* These functions are dirty hacks for IE 5.0 which does not increment a
* reference counter for an object passed via setTimeout(). So, if this
* object (closure function) is out of scope at the moment of timeout
* applying, IE 5.0 crashes.
*/
/**
* Timeout wrappers storage. Used to avoid zeroing of referece counts in IE 5.0.
* Please note that you MUST write "window.setTimeout", not "setTimeout", else
* IE 5.0 crashes again. Strange, very strange...
*/
JsHttpRequest.TIMEOUTS = { s: window.setTimeout, c: window.clearTimeout };
/**
* Wrapper for IE5 buggy setTimeout.
* Use this function instead of a usual setTimeout().
*/
JsHttpRequest.setTimeout = function(func, dt) {
// Always save inside the window object before a call (for FF)!
window.JsHttpRequest_tmp = JsHttpRequest.TIMEOUTS.s;
if (typeof(func) == "string") {
id = window.JsHttpRequest_tmp(func, dt);
} else {
var id = null;
var mediator = function() {
func();
delete JsHttpRequest.TIMEOUTS[id]; // remove circular reference
}
id = window.JsHttpRequest_tmp(mediator, dt);
// Store a reference to the mediator function to the global array
// (reference count >= 1); use timeout ID as an array key;
JsHttpRequest.TIMEOUTS[id] = mediator;
}
window.JsHttpRequest_tmp = null; // no delete() in IE5 for window
return id;
}
/**
* Complimental wrapper for clearTimeout.
* Use this function instead of usual clearTimeout().
*/
JsHttpRequest.clearTimeout = function(id) {
window.JsHttpRequest_tmp = JsHttpRequest.TIMEOUTS.c;
delete JsHttpRequest.TIMEOUTS[id]; // remove circular reference
var r = window.JsHttpRequest_tmp(id);
window.JsHttpRequest_tmp = null; // no delete() in IE5 for window
return r;
}
/**
* Global static function.
* Simple interface for most popular use-cases.
* You may also pass URLs like "GET url" or "script.GET url".
*/
JsHttpRequest.query = function(url, content, onready, nocache) {
var req = new this();
req.caching = !nocache;
req.onreadystatechange = function() {
if (req.readyState == 4) {
onready(req.responseJS, req.responseText);
}
}
req.open(null, url, true);
req.send(content);
}
/**
* Global static function.
* Called by server backend script on data load.
*/
JsHttpRequest.dataReady = function(d) {
var th = this.PENDING[d.id];
delete this.PENDING[d.id];
if (th) {
th._dataReady(d.text, d.js);
} else if (th !== false) {
throw "dataReady(): unknown pending id: " + d.id;
}
}
// Adds all the properties of src to dest.
JsHttpRequest.extend = function(dest, src) {
for (var k in src) dest[k] = src[k];
}
/**
* Each loader has the following properties which must be initialized:
* - method
* - url
* - asyncFlag (ignored)
* - username
* - password
* - queryText (string)
* - queryElem (array)
* - id
* - hash
* - span
*/
// }}}
// {{{ xml
// Loader: XMLHttpRequest or ActiveX.
// [+] GET and POST methods are supported.
// [+] Most native and memory-cheap method.
// [+] Backend data can be browser-cached.
// [-] Cannot work in IE without ActiveX.
// [-] No support for loading from different domains.
// [-] No uploading support.
//
JsHttpRequest.LOADERS.xml = { loader: function(req) {
JsHttpRequest.extend(req._errors, {
xml_no: 'Cannot use XMLHttpRequest or ActiveX loader: not supported',
xml_no_diffdom: 'Cannot use XMLHttpRequest to load data from different domain %',
xml_no_headers: 'Cannot use XMLHttpRequest loader or ActiveX loader, POST method: headers setting is not supported, needed to work with encodings correctly',
xml_no_form_upl: 'Cannot use XMLHttpRequest loader: direct form elements using and uploading are not implemented'
});
this.load = function() {
if (this.queryElem.length) return ['xml_no_form_upl'];
// XMLHttpRequest (and MS ActiveX'es) cannot work with different domains.
if (this.url.match(new RegExp('^([a-z]+://[^\\/]+)(.*)', 'i'))) {
// We MUST also check if protocols matched: cannot send from HTTP
// to HTTPS and vice versa.
if (RegExp.$1.toLowerCase() != document.location.protocol + '//' + document.location.hostname.toLowerCase()) {
return ['xml_no_diffdom', RegExp.$1];
}
}
// Try to obtain a loader.
var xr = null;
if (window.XMLHttpRequest) {
try { xr = new XMLHttpRequest() } catch(e) {}
} else if (window.ActiveXObject) {
try { xr = new ActiveXObject("Microsoft.XMLHTTP") } catch(e) {}
if (!xr) try { xr = new ActiveXObject("Msxml2.XMLHTTP") } catch (e) {}
}
if (!xr) return ['xml_no'];
// Loading method detection. We cannot POST if we cannot set "octet-stream"
// header, because we need to process the encoded data in the backend manually.
var canSetHeaders = window.ActiveXObject || xr.setRequestHeader;
if (!this.method) this.method = canSetHeaders && this.queryText.length? 'POST' : 'GET';
// Build & validate the full URL.
if (this.method == 'GET') {
if (this.queryText) this.url += (this.url.indexOf('?') >= 0? '&' : '?') + this.queryText;
this.queryText = '';
if (this.url.length > JsHttpRequest.MAX_URL_LEN) return ['url_too_long', JsHttpRequest.MAX_URL_LEN];
} else if (this.method == 'POST' && !canSetHeaders) {
return ['xml_no_headers'];
}
// Add ID to the url if we need to disable the cache.
this.url += (this.url.indexOf('?') >= 0? '&' : '?') + 'JsHttpRequest=' + (req.caching? '0' : this.id) + '-xml';
// Assign the result handler.
var id = this.id;
xr.onreadystatechange = function() {
if (xr.readyState != 4) return;
// Avoid memory leak by removing the closure.
xr.onreadystatechange = JsHttpRequest._dummy;
req.status = null;
try {
// In case of abort() call, xr.status is unavailable and generates exception.
// But xr.readyState equals to 4 in this case. Stupid behaviour. :-(
req.status = xr.status;
req.responseText = xr.responseText;
} catch (e) {}
if (!req.status) return;
try {
// Prepare generator function & catch syntax errors on this stage.
eval('JsHttpRequest._tmp = function(id) { var d = ' + req.responseText + '; d.id = id; JsHttpRequest.dataReady(d); }');
} catch (e) {
// Note that FF 2.0 does not throw any error from onreadystatechange handler.
return req._error('js_invalid', req.responseText)
}
// Call associated dataReady() outside the try-catch block
// to pass exceptions in onreadystatechange in usual manner.
JsHttpRequest._tmp(id);
JsHttpRequest._tmp = null;
};
// Open & send the request.
xr.open(this.method, this.url, true, this.username, this.password);
if (canSetHeaders) {
// Pass pending headers.
for (var i = 0; i < req._reqHeaders.length; i++) {
xr.setRequestHeader(req._reqHeaders[i][0], req._reqHeaders[i][1]);
}
// Set non-default Content-type. We cannot use
// "application/x-www-form-urlencoded" here, because
// in PHP variable HTTP_RAW_POST_DATA is accessible only when
// enctype is not default (e.g., "application/octet-stream"
// is a good start). We parse POST data manually in backend
// library code. Note that Safari sets by default "x-www-form-urlencoded"
// header, but FF sets "text/xml" by default.
xr.setRequestHeader('Content-Type', 'application/octet-stream');
}
xr.send(this.queryText);
// No SPAN is used for this loader.
this.span = null;
this.xr = xr; // save for later usage on abort()
// Success.
return null;
}
// Override req.getAllResponseHeaders method.
this.getAllResponseHeaders = function() {
return this.xr.getAllResponseHeaders();
}
// Override req.getResponseHeader method.
this.getResponseHeader = function(label) {
return this.xr.getResponseHeader(label);
}
this.abort = function() {
this.xr.abort();
this.xr = null;
}
}}
// }}}
// {{{ script
// Loader: SCRIPT tag.
// [+] Most cross-browser.
// [+] Supports loading from different domains.
// [-] Only GET method is supported.
// [-] No uploading support.
// [-] Backend data cannot be browser-cached.
//
JsHttpRequest.LOADERS.script = { loader: function(req) {
JsHttpRequest.extend(req._errors, {
script_only_get: 'Cannot use SCRIPT loader: it supports only GET method',
script_no_form: 'Cannot use SCRIPT loader: direct form elements using and uploading are not implemented'
})
this.load = function() {
// Move GET parameters to the URL itself.
if (this.queryText) this.url += (this.url.indexOf('?') >= 0? '&' : '?') + this.queryText;
this.url += (this.url.indexOf('?') >= 0? '&' : '?') + 'JsHttpRequest=' + this.id + '-' + 'script';
this.queryText = '';
if (!this.method) this.method = 'GET';
if (this.method !== 'GET') return ['script_only_get'];
if (this.queryElem.length) return ['script_no_form'];
if (this.url.length > JsHttpRequest.MAX_URL_LEN) return ['url_too_long', JsHttpRequest.MAX_URL_LEN];
var th = this, d = document, s = null, b = d.body;
if (!window.opera) {
// Safari, IE, FF, Opera 7.20.
this.span = s = d.createElement('SCRIPT');
var closure = function() {
s.language = 'JavaScript';
if (s.setAttribute) s.setAttribute('src', th.url); else s.src = th.url;
b.insertBefore(s, b.lastChild);
}
} else {
// Oh shit! Damned stupid Opera 7.23 does not allow to create SCRIPT
// element over createElement (in HEAD or BODY section or in nested SPAN -
// no matter): it is created deadly, and does not response the href assignment.
// So - always create SPAN.
this.span = s = d.createElement('SPAN');
s.style.display = 'none';
b.insertBefore(s, b.lastChild);
s.innerHTML = 'Workaround for IE.<s'+'cript></' + 'script>';
var closure = function() {
s = s.getElementsByTagName('SCRIPT')[0]; // get with timeout!
s.language = 'JavaScript';
if (s.setAttribute) s.setAttribute('src', th.url); else s.src = th.url;
}
}
JsHttpRequest.setTimeout(closure, 10);
// Success.
return null;
}
}}
// }}}
// {{{ form
// Loader: FORM & IFRAME.
// [+] Supports file uploading.
// [+] GET and POST methods are supported.
// [+] Supports loading from different domains.
// [-] Uses a lot of system resources.
// [-] Backend data cannot be browser-cached.
// [-] Pollutes browser history on some old browsers.
//
JsHttpRequest.LOADERS.form = { loader: function(req) {
JsHttpRequest.extend(req._errors, {
form_el_not_belong: 'Element "%" does not belong to any form!',
form_el_belong_diff: 'Element "%" belongs to a different form. All elements must belong to the same form!',
form_el_inv_enctype: 'Attribute "enctype" of the form must be "%" (for IE), "%" given.'
})
this.load = function() {
var th = this;
if (!th.method) th.method = 'POST';
th.url += (th.url.indexOf('?') >= 0? '&' : '?') + 'JsHttpRequest=' + th.id + '-' + 'form';
// If GET, build full URL. Then copy QUERY_STRING to queryText.
if (th.method == 'GET') {
if (th.queryText) th.url += (th.url.indexOf('?') >= 0? '&' : '?') + th.queryText;
if (th.url.length > JsHttpRequest.MAX_URL_LEN) return ['url_too_long', JsHttpRequest.MAX_URL_LEN];
var p = th.url.split('?', 2);
th.url = p[0];
th.queryText = p[1] || '';
}
// Check if all form elements belong to same form.
var form = null;
var wholeFormSending = false;
if (th.queryElem.length) {
if (th.queryElem[0].e.tagName.toUpperCase() == 'FORM') {
// Whole FORM sending.
form = th.queryElem[0].e;
wholeFormSending = true;
th.queryElem = [];
} else {
// If we have at least one form element, we use its FORM as a POST container.
form = th.queryElem[0].e.form;
// Validate all the elements.
for (var i = 0; i < th.queryElem.length; i++) {
var e = th.queryElem[i].e;
if (!e.form) {
return ['form_el_not_belong', e.name];
}
if (e.form != form) {
return ['form_el_belong_diff', e.name];
}
}
}
// Check enctype of the form.
if (th.method == 'POST') {
var need = "multipart/form-data";
var given = (form.attributes.encType && form.attributes.encType.nodeValue) || (form.attributes.enctype && form.attributes.enctype.value) || form.enctype;
if (given != need) {
return ['form_el_inv_enctype', need, given];
}
}
}
// Create invisible IFRAME with temporary form (form is used on empty queryElem).
// We ALWAYS create th IFRAME in the document of the form - for Opera 7.20.
var d = form && (form.ownerDocument || form.document) || document;
var ifname = 'jshr_i_' + th.id;
var s = th.span = d.createElement('DIV');
s.style.position = 'absolute';
s.style.display = 'none';
s.style.visibility = 'hidden';
s.innerHTML =
(form? '' : '<form' + (th.method == 'POST'? ' enctype="multipart/form-data" method="post"' : '') + '></form>') + // stupid IE, MUST use innerHTML assignment :-(
'<iframe name="' + ifname + '" id="' + ifname + '" style="width:0px; height:0px; overflow:hidden; border:none"></iframe>'
if (!form) {
form = th.span.firstChild;
}
// Insert generated form inside the document.
// Be careful: don't forget to close FORM container in document body!
d.body.insertBefore(s, d.body.lastChild);
// Function to safely set the form attributes. Parameter attr is NOT a hash
// but an array, because "for ... in" may badly iterate over derived attributes.
var setAttributes = function(e, attr) {
var sv = [];
var form = e;
// This strange algorythm is needed, because form may contain element
// with name like 'action'. In IE for such attribute will be returned
// form element node, not form action. Workaround: copy all attributes
// to new empty form and work with it, then copy them back. This is
// THE ONLY working algorythm since a lot of bugs in IE5.0 (e.g.
// with e.attributes property: causes IE crash).
if (e.mergeAttributes) {
var form = d.createElement('form');
form.mergeAttributes(e, false);
}
for (var i = 0; i < attr.length; i++) {
var k = attr[i][0], v = attr[i][1];
// TODO: http://forum.dklab.ru/viewtopic.php?p=129059#129059
sv[sv.length] = [k, form.getAttribute(k)];
form.setAttribute(k, v);
}
if (e.mergeAttributes) {
e.mergeAttributes(form, false);
}
return sv;
}
// Run submit with delay - for old Opera: it needs some time to create IFRAME.
var closure = function() {
// Save JsHttpRequest object to new IFRAME.
top.JsHttpRequestGlobal = JsHttpRequest;
// Disable ALL the form elements.
var savedNames = [];
if (!wholeFormSending) {
for (var i = 0, n = form.elements.length; i < n; i++) {
savedNames[i] = form.elements[i].name;
form.elements[i].name = '';
}
}
// Insert hidden fields to the form.
var qt = th.queryText.split('&');
for (var i = qt.length - 1; i >= 0; i--) {
var pair = qt[i].split('=', 2);
var e = d.createElement('INPUT');
e.type = 'hidden';
e.name = unescape(pair[0]);
e.value = pair[1] != null? unescape(pair[1]) : '';
form.appendChild(e);
}
// Change names of along user-passed form elements.
for (var i = 0; i < th.queryElem.length; i++) {
th.queryElem[i].e.name = th.queryElem[i].name;
}
// Temporary modify form attributes, submit form, restore attributes back.
var sv = setAttributes(
form,
[
['action', th.url],
['method', th.method],
['onsubmit', null],
['target', ifname]
]
);
form.submit();
setAttributes(form, sv);
// Remove generated temporary hidden elements from the top of the form.
for (var i = 0; i < qt.length; i++) {
// Use "form.firstChild.parentNode", not "form", or IE5 crashes!
form.lastChild.parentNode.removeChild(form.lastChild);
}
// Enable all disabled elements back.
if (!wholeFormSending) {
for (var i = 0, n = form.elements.length; i < n; i++) {
form.elements[i].name = savedNames[i];
}
}
}
JsHttpRequest.setTimeout(closure, 100);
// Success.
return null;
}
}}
// }}}