// Copyright 2001-2005 Interakt Online. All rights reserved.



/*

 *

dependent dropdown

should create two objects : 

	masterselect, only if it doesn't exist

	details select

 */

$DDN_GLOBALOBJECT = 'DependentDropdowns';

window[$DDN_GLOBALOBJECT] = {};



function MXW_DependentDropdown(detailSelect) {

	this.detailSelect = document.getElementById(detailSelect);

	this.masterSelect = document.getElementById(WDG_getAttributeNS(this.detailSelect, 'triggerobject'));



	var tmp = new MXW_MasterSelect(this.masterSelect);

	

	this.recordset = new JSRecordset(WDG_getAttributeNS(this.detailSelect, 'recordset'));

	this.fkey = WDG_getAttributeNS(this.detailSelect, 'fkey');

	this.valuefield = WDG_getAttributeNS(this.detailSelect, 'valuefield');

	this.displayfield = WDG_getAttributeNS(this.detailSelect, 'displayfield');

	this.defaultValue = WDG_getAttributeNS(this.detailSelect, 'selected');



	window[$DDN_GLOBALOBJECT][this.detailSelect.id] = this;



	window[$DDR_DEPENDENT_OBJ][this.masterSelect.id + '_' + this.detailSelect.id] = this;

	__sig__.connectByName(tmp, 'change', this, 'updateMe');

	this.initialize();

}







function MXW_DependentDropdown_initialize() {

	this.defaultOptions = [];

	for (var i=0; i < this.detailSelect.options.length; i++) {

		Array_push(this.defaultOptions, {

			'value': this.detailSelect.options[i].value, 

			'text': this.detailSelect.options[i].text

		});

	}



	if (this.defaultValue) {

		if(this.recordset.find(this.valuefield, "=", this.defaultValue) ) {

			if (typeof window[$DDN_GLOBALOBJECT][this.masterSelect.id] == 'undefined') {

				WDG_setAttributeNS(this.masterSelect, "selected", this.recordset.Fields(this.fkey));

				for (var i=0;i<this.masterSelect.options.length;i++) {

					if (this.masterSelect.options[i].value == this.recordset.Fields(this.fkey)) {

						this.masterSelect.selectedIndex = i;

						this.updateMe();

						break;

					}

				}

			} else {

				var masterdep = window[$DDN_GLOBALOBJECT][this.masterSelect.id];

				masterdep.select(this.recordset.Fields(this.fkey));

			}

		}

	} else {

		this.updateMe();

	}

}



function MXW_DependentDropdown_select(val) {

	this.defaultValue = val;

	WDG_setAttributeNS(this.detailSelect, "selected", val);

	for(var i=0; i<this.detailSelect.options.length; i++) {

		if (this.detailSelect.options[i].value == val) {

			this.updateMe();

			return;

		}

	}

	var par_value = "";



	if (this.recordset.find(this.valuefield, "=", val) ) {

		par_value = this.recordset.Fields(this.fkey);

	} else {

		return;

	}



	if (typeof window[$DDN_GLOBALOBJECT][this.masterSelect.id] != 'undefined') {

		var masterdep = window[$DDN_GLOBALOBJECT][this.masterSelect.id];

		masterdep.select(par_value);

	} else {

		utility.dom.selectOption(this.masterSelect, par_value);

		this.updateMe();

	}

}



function MXW_DependentDropdown_updateMe() {

	var detailSelect = this.detailSelect;

	var masterSelect = this.masterSelect;

	var defaultOptions = this.defaultOptions;

	detailSelect.options.length = 0;



	if (masterSelect.options.length == 0) {

		return;

	}



	// first add defaults

	Array_each(defaultOptions, function(item, i) {

		detailSelect.options[detailSelect.options.length] = 

			new Option(utility.string.getInnerText(item['text']), item['value']);

	});



	// add values

	this.recordset.MoveFirst();

	if (masterSelect.selectedIndex != -1) { 

		var selectedValues = [];

		for(var i=0; i<masterSelect.options.length; i++) {

			if(masterSelect.options[i].selected)  {

				 Array_push(selectedValues, masterSelect.options[i].value);

			}

		}

		var optLength = detailSelect.options.length, selOptIndex = 0;

		while (this.recordset.MoveNext()) {

				if(Array_indexOf(selectedValues, this.recordset.Fields(this.fkey))>=0) {

				var o = new Option(

					utility.string.getInnerText(this.recordset.Fields(this.displayfield)), 

					this.recordset.Fields(this.valuefield)

				);

				optLength++;

				if (this.defaultValue == this.recordset.Fields(this.valuefield)) {

					selOptIndex = optLength - 1;

				}

				detailSelect.options[detailSelect.options.length] = o;

			}

		}

		try { detailSelect.selectedIndex = selOptIndex; this.defaultValue = detailSelect.options[detailSelect.selectedIndex].value;} catch(e) { }

	}

	if (typeof window[$DDR_MASTERSELECT_OBJ][this.detailSelect.id] != 'undefined') {

		window[$DDR_MASTERSELECT_OBJ][this.detailSelect.id].change();

	}

}

MXW_DependentDropdown.prototype.initialize = MXW_DependentDropdown_initialize;

MXW_DependentDropdown.prototype.select = MXW_DependentDropdown_select;

MXW_DependentDropdown.prototype.updateMe = MXW_DependentDropdown_updateMe;