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function CreateCORSRequest(method, url)
{
var xhr = new XMLHttpRequest();
if ("withCredentials" in xhr) {
xhr.open(method, url, true);
} else {
xhr = null;
}
return xhr;
}
function catch_return(e)
{
if (e.keyCode == 13) {
e.preventDefault();
Next();
}
return false;
}
function pause()
{
var paused = document.getElementById("paused");
var button = document.getElementById("pause_button");
var next_button = document.getElementById("next");
if (paused.value == 0) {
button.innerHTML = "Unpause";
paused.value = 1;
next.setAttribute("disabled", "disabled");
} else {
button.innerHTML = "Pause";
paused.value = 0;
next.removeAttribute("disabled");
}
}
function Next()
{
// elements
var button = document.getElementById("next");
var target_textarea = document.getElementById("target_textarea")
var raw_source_textarea = document.getElementById("raw_source_textarea");
var current_seg_id = document.getElementById("current_seg_id");
var source = document.getElementById("source");
var status = document.getElementById("status");
// disable button and textarea
button.setAttribute("disabled", "disabled");
target_textarea.setAttribute("disabled", "disabled");
var base_url = "http://coltrane.cl.uni-heidelberg.de:60666"; // FIXME: variable
var key = document.getElementById("key").value;
next_url = base_url+"/next?key="+key;
var post_edit = target_textarea.value;
if (post_edit != "") {
// compose request
next_url += "&example="+source.value+" %7C%7C%7C "+post_edit;
// update document overview
document.getElementById("seg_"+(current_seg_id.value)+"_t").innerHTML=post_edit;
} else {
if (source.value != "") {
alert("Error: 1");
}
// FIXME: do something reasonable
}
// show 'working' message
status.style.display = "block";
// build request
var xhr = CreateCORSRequest('get', next_url);
if (!xhr) {
alert("Error: 2");
// FIXME: do something reasonable
}
// 'next' request's callbacks
xhr.onload = function() {
/*
* translation system is currently handling another request
* FIXME: maybe poll server for result?
*
*/
if (xhr.responseText == "locked") {
alert("Translation system is locked, try again in a moment (reload page and click 'Start/Continue' again).");
document.getElementById("status").style.display = "none";
return;
}
// got response: seg id\tsource\ttranslation\traw source
// 0 1 2 3
var x = xhr.responseText.split("\t");
if (x == "fi") { // done, hide/disable functional elements
raw_source_textarea.style.display = "none";
target_textarea.style.display = "none";
status.style.display = "none";
button.innerHTML = "Session finished, thank you!";
button.setAttribute("disabled", "disabled");
document.getElementById("pause_button").setAttribute("disabled", "disabled");
document.getElementById("seg_"+current_seg_id.value).className = "";
} else {
var id = x[0];
var src = x[1];
var translation = x[2];
var raw_source = x[3];
// update interface
status.style.display = "none";
target_textarea.value = translation;
raw_source_textarea.value = raw_source;
button.innerHTML = "Next";
button.removeAttribute("disabled");
target_textarea.removeAttribute("disabled", "disabled");
document.getElementById("seg_"+id).className = "bold";
if (x[0] > 0) {
document.getElementById("seg_"+(id-1)).className = "";
}
target_textarea.rows = Math.round(translation.length/80)+1;
raw_source_textarea.rows = Math.round(raw_source.length/80)+1;
target_textarea.focus();
target_textarea.selectionStart = 0;
target_textarea.selectionEnd = 0;
// remember aux data in DOM
current_seg_id.value = id;
source.value = src;
// confirm to server
var xhr_confirm = CreateCORSRequest('get', "http://coltrane.cl.uni-heidelberg.de:60666/confirm");
xhr_confirm.send(); // FIXME: handle errors
}
};
xhr.onerror = function() {
// FIXME: do something reasonable
};
xhr.send(); // send 'next' request
}
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