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/**
* @author <a href="mailto:keith.hughitt@nasa.gov">Keith Hughitt</a>
* @fileOverview Contains the definition for a Hierarchical or "Tree Select" class which links
* several select form elements together based off a given tree structure such changes at any level automatically
* determine valid options for select items at lower levels.
*/
/*jslint browser: true, evil: true, white: true, onevar: true, undef: true, nomen: false, eqeqeq: true, plusplus: true,
bitwise: true, regexp: true, strict: true, forin: true, newcap: true, immed: true, maxlen: 120, sub: true */
/*global Class, $, window */
"use strict";
var TreeSelect = Class.extend(
/** @lends TreeSelect.prototype */
{
/**
* @description
* @param {Object}
* @constructs
*/
init: function (selectIds, tree, initialChoices, callback) {
this.selectIds = selectIds;
this.tree = tree;
this.height = selectIds.length;
this.callback = callback;
this.selected = initialChoices;
this._initSelectMenus();
this._setupEventHandlers();
},
/**
* @description Populates SELECT menus and selects initial choices
*/
_initSelectMenus: function () {
var self = this;
// Load initial options into select menus
this._updateSelectMenus(0);
// Set initial choices in select menus
$.each(this.selectIds, function (depth, id) {
$(id + " > option").each(function (index, option) {
if (option.value === self.selected[depth]) {
$(id).prop("selectedIndex", index);
}
});
});
},
/**
* @description Update the list of selected options
* @param {Object} depth
* @param {Object} newChoice
*/
_updateSelected: function (depth, newChoice) {
var nav, selectField, i;
this.selected[depth] = newChoice;
// Function to determine which field should be selected
selectField = function (original, arr) {
if (original in arr) {
return original;
}
for (var item in arr) {
return item;
}
};
// For each item below the selected parameter, preserve the value if
// possible, otherwise use first available value
nav = "this.tree";
for (i = 0; i < this.height; i += 1) {
if (i > depth) {
this.selected[i] = selectField(this.selected[i], eval(nav));
}
nav += '["' + this.selected[i] + '"]';
}
this._updateSelectMenus(depth + 1);
},
/**
* @description Updates the SELECT menus to show valid choices at
* each level based on chosen values from above levels.
* @param {Object} startDepth
*/
_updateSelectMenus: function (startDepth) {
var select, choice, i, nav, opt, self = this;
$.each(this.selectIds, function (depth, id) {
if (depth >= startDepth) {
select = $(id);
// remove old choices
select.empty();
// navigate to current depth
nav = "self.tree";
for (i = 0; i < depth; i += 1) {
nav += '["' + self.selected[i] + '"]';
}
// get choices
for (var choice in eval(nav)) {
opt = $("<option value='" + choice + "'>" +
choice.replace(/_/, "-") + "</option>");
select.append(opt);
}
// set selected value
choice = self.selected[depth];
select.find("option[value=" + choice + "]").prop("selected", true);
}
});
},
/**
* @description Returns the value associated with the currently selected leaf-node
*/
_value: function () {
var nav = "this.tree";
$.each(this.selected, function (i, choice) {
nav += '["' + choice + '"]';
});
return eval(nav);
},
/**
* @description Sets up event-handlers for each form field
*/
_setupEventHandlers: function () {
var self = this;
$.each(this.selectIds, function (i, id) {
$(id).change(function (e) {
self._updateSelected(i, this.value);
self.callback(self._value());
});
});
}
});
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