/**
* JsHttpRequest: JavaScript "AJAX" data loader (form support only!)
*
* @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, ') + // stupid IE, MUST use innerHTML assignment :-(
''
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;
}
}}
// }}}