metanohi-misc-subsites/old-projects/algo/js/httpobj.js

106 lines
3.2 KiB
JavaScript
Raw Normal View History

2011-08-02 19:57:57 +02:00
/*
This program is free software. It comes without any warranty, to
the extent permitted by applicable law. You can redistribute it
and/or modify it under the terms of the Do What The Fuck You Want
To Public License, Version 2, as published by Sam Hocevar. See
http://sam.zoy.org/wtfpl/COPYING for more details.
*/
/*
httpobj: javascript class using XMLHttpRequest to send and retrieve info.
See /httpobj to get an example of the usage.
*/
//v.1.0
function httpobj() {
// Get XMLHttpRequest object
this.obj = this.getobj()
if (!this.obj) {
alert('Your browser does not support HTTP Requests! Get a new one (a browser, that is. Not a request).')
delete this
return false
}
// Define default variables
this.param = {}
this.method = 'POST'
// Fix for later on
this.obj.topelem = this
}
httpobj.prototype.getobj = function() {
// Try to get the XMLHttpRequest object
try { return new XMLHttpRequest() } catch (e) {}
try { return new ActiveXObject('Msxml2.XMLHTTP.6.0') } catch(e) {}
try { return new ActiveXObject('Msxml2.XMLHTTP.3.0') } catch(e) {}
try { return new ActiveXObject('Msxml2.XMLHTTP') } catch(e) {}
try { return new ActiveXObject('Microsoft.XMLHTTP') }
catch(e) {
return false // FAILURE
}
}
httpobj.prototype.send = function() {
/*
send(): Sends parametres (param) to url (url) and sets up function to
react on retrievement
*/
if (!this.url) {
// Exit function if either url or the function to be called is undefined
delete this
return false
}
// Transform param into string type ?foo=bar&hmm=aha
this.text_params = ''
if (this.param) {
for (var x in this.param)
this.text_params += '&' + x + '=' + this.param[x]
this.text_params = this.text_params.substr(1)
}
if (this.method.toLowerCase() == 'get') {
// In case of GET method, use '?'
var after_url
if (!this.param)
after_url = ''
else
after_url = '?' + this.text_params
this.obj.open('GET', this.url + after_url, true)
this.obj.send(null)
}
else {
// In case of POST method, use RequestHeader
this.obj.open('POST', this.url, true)
this.obj.setRequestHeader('Content-type', 'application/x-www-form-urlencoded')
this.obj.setRequestHeader('Content-length', this.text_params.length)
this.obj.setRequestHeader('Connection', 'close')
this.obj.send(this.text_params)
}
// What to do when something happens
this.obj.onreadystatechange = function() {
// Only do something when it's complete
if (this.readyState == 4 || this.readyState == 'complete') {
// Define 3 variables to be used with the user-defined function (func)
var text, params, state
text = this.responseText
params = this.topelem.param // this.topelem = this.obj.topelem = this
// State 0 is good, state 1 is bad
state = 0
if (this.status != 200) {
state = 1
text = ''
}
// Call user-defined function
if (this.topelem.func)
eval(this.topelem.func)
delete this
}
}
return true // It has a chance of working..
}