/**
 * @alias Form.class
 * @author WilC <wilz04@gmail.com>
 * @since 2008
 */

function Form(id) {
	
	var canvas = document.getElementById(id);
	
	function throwSubmitException(exception) {
		throw exception;
		return false;
	}
	
	function throwSubmitSuccess() {
		return true;
	}
	
	this.onSubmitException = function (action) {
		throwSubmitException = action;
	};
	
	this.onSubmitSuccess = function (action) {
		throwSubmitSuccess = action;
	};
	
	canvas.onsubmit = function () {
		try {
			var id;
			var tmp;
			var files = new Array();
			for (var index=0; index<this.length; index++) {
				id = this.elements[index].id;
				if (id) {
					tmp = document.getElementById(id);
					if (tmp) {
						switch (tmp.tagName) {
							case "INPUT":
								switch (tmp.getAttribute("type")) {
									case "radio":
										if (tmp.getAttribute("required") == "true") {
											var rg = new RadioGroup(id);
											if (!rg.isChecked()) {
												rg.setFocus();
												return throwSubmitException(new Error("Null data exception"));
											}
										}
									break;
									case "checkbox":
										if (tmp.getAttribute("required") == "true") {
											if (!tmp.checked) {
												tmp.focus();
												return throwSubmitException(new Error("Null data exception"));
											}
										}
									break;
									case "file":
										if (tmp.getAttribute("required") == "true") {
											if (tmp.value == "") {
												tmp.focus();
												return throwSubmitException(new Error("Null data exception"));
											}
										}
										files.push(tmp);
									break;
									default:
										// text
										if (tmp.getAttribute("required") == "true") {
											if (tmp.value == "") {
												tmp.focus();
												return throwSubmitException(new Error("Null data exception"));
											}
										}
										if (tmp.getAttribute("datatype") == "number") {
											if (isNaN(tmp.value)) {
												tmp.focus();
												return throwSubmitException(new Error("Incompatible types"));
											}
										}
									break;
								}
							break;
							case "SELECT":
								if (tmp.getAttribute("required") == "true") {
									var cb = new ComboBox(id);
									if (cb.getValue() == "") {
										cb.setFocus();
										return throwSubmitException(new Error("Null data exception"));
									}
								}
							break;
							default:
								// TEXTAREA
								if (tmp.getAttribute("required") == "true") {
									if (tmp.value == "") {
										tmp.focus();
										return throwSubmitException(new Error("Null data exception"));
									}
								}
							break;
						}
					}
				}
			}
			var i;
			var j;
			for (i in files) {
				if (files[i].getAttribute("unique") == "true") {
					if (files[i].value != "") {
						for (j in files) {
							if (i != j) {
								if (files[j].value.split("\\").pop() == files[i].value.split("\\").pop()) {
									files[i].focus();
									return throwSubmitException(new Error("Duplicate data exception"));
								}
							}
						}
					}
				}
			}
		} catch (exception) {}
		return throwSubmitSuccess();
	};
	
	this.onSubmit = function (action) {
		canvas.onsubmit = action;
	};
	
	this.check = function () {
		return canvas.onsubmit();
	};
	
}