var FORM_MANAGER_CONDITION_SEPARATOR = " AND ";
var FORM_MANAGER_POSSIBILITY_SEPARATOR = " OR ";
var FORM_MANAGER_NAME_VALUE_SEPARATOR = " BEING ";
var FORM_MANAGER_DEPENDS = "DEPENDS ON ";
var FORM_MANAGER_CONFLICTS = "CONFLICTS WITH ";
var FORM_MANAGER_EMPTY = "EMPTY";
function addEvent(el, ev, f) {
if(el.addEventListener)
el.addEventListener(ev, f, false);
else if(el.attachEvent) {
var t = function() {
f.apply(el);
};
addEvent.events.push({'element': el, 'event': ev, 'handler': f});
el.attachEvent("on" + ev, t);
} else
el['on' + ev] = f;
}
function addEvents(els, evs, f) {
for(var i = 0; i < els.length; ++i)
for(var j = 0; j < evs.length; ++j)
addEvent(els[i], evs[j], f);
}
addEvent.events = [];
if(typeof window.event !== "undefined")
addEvent(window, "unload", function() {
for(var i = 0, e = addEvent.events; i < e.length; ++i)
e[i].element.detachEvent("on" + e[i].event, e[i].handler);
}
);
function getRadioValue(el) {
if(!el.length) return null;
for(var i = 0; i < el.length; ++i)
if(el[i].checked) return el[i].value;
return null;
}
function getSelectValue(el) {
if(!el.tagName || el.tagName.toLowerCase() !== "select")
return null;
return el.options[el.selectedIndex].value;
}
function isElementValue(el, v) {
if(v === FORM_MANAGER_EMPTY) v = '';
return (
getRadioValue(el) == v ||
getSelectValue(el) == v ||
(
el.tagName &&
el.tagName.toLowerCase() !== "select" &&
el.value == v
)
);
}
function setupDependencies() {
var showEl = function() {
this.style.display = "";
if(this.parentNode.tagName.toLowerCase() == "label")
this.parentNode.style.display = "";
};
var hideEl = function() {
this.style.display = "none";
if(typeof this.checked !== "undefined") this.checked = false;
else this.value = "";
if(this.parentNode.tagName.toLowerCase() == "label")
this.parentNode.style.display = "none";
this.hidden = true;
};
var calcDeps = function() {
for(var i = 0, e = this.elements; i < e.length; ++i) {
e[i].hidden = false;
for(var j = 0, f = e[i].className.split(FORM_MANAGER_CONDITION_SEPARATOR); j < f.length; ++j)
if(f[j].indexOf(FORM_MANAGER_DEPENDS) === 0) {
for(var k = 0, g = f[j].substr(FORM_MANAGER_DEPENDS.length).split(FORM_MANAGER_POSSIBILITY_SEPARATOR); k < g.length; ++k)
if(g[k].indexOf(FORM_MANAGER_NAME_VALUE_SEPARATOR) === -1) {
if(e[g[k]] && e[g[k]].checked) break;
else if(k + 1 == g.length)
e[i].hide();
} else {
var n = g[k].split(FORM_MANAGER_NAME_VALUE_SEPARATOR),
v = n[1];
n = n[0];
if(e[n])
if(isElementValue(e[n], v)) break;
else if(k + 1 == g.length) e[i].hide();
}
} else if(f[j].indexOf(FORM_MANAGER_CONFLICTS) === 0) {
if(f[j].indexOf(FORM_MANAGER_NAME_VALUE_SEPARATOR) === -1) {
if(e[f[j].substr(FORM_MANAGER_CONFLICTS.length)] && e[f[j].substr(FORM_MANAGER_CONFLICTS.length)].checked) {
e[i].hide();
break;
}
} else {
var n = f[j].substr(FORM_MANAGER_CONFLICTS.length).split(FORM_MANAGER_NAME_VALUE_SEPARATOR),
v = n[1];
n = n[0];
if(e[n]) {
if(isElementValue(e[n], v)) {
e[i].hide();
break;
}
}
}
}
if(!e[i].hidden) e[i].show();
}
};
var changeHandler = function() {
this.form.calculateDependencies();
return true;
};
for(var i = 0; i < arguments.length; ++i) {
for(var j = 0, e = window.document.forms[arguments[i]].elements; j < e.length; ++j) {
addEvents([e[j]], ["change", "keyup", "focus", "click", "keydown"], changeHandler);
e[j].hide = hideEl;
e[j].show = showEl;
}
(e = window.document.forms[arguments[i]]).calculateDependencies = calcDeps;
e.calculateDependencies();
}
}
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