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jquery.simplejqtree.js
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jquery.simplejqtree.js
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(function($) {
//helper function
function attr_instancer(attr, toinstance){
var result = {};
$.each(attr, function(){
result[this] = toinstance[attr[this]];
});
return result;
}
/**
* @constructor
* @param jqElement item, The root element for the tree
* @param {Object} conf, the conf dictionary
*/
function SimpleJqTree( item, conf ) {
var self = this,
trigger = item.add(self),
json_attr = conf.json_attr;
item.addClass('tree');
//methods
$.extend(self, {
/**
* Converts and enhances a basic <ul> tree with the elements needed
* by simplejqtree
* @param jqElement tree, some top node in a ul tree
*/
markup: function(tree){
var $tree = tree,
placeholder = '<img class="dummy" alt="icon" src="data:image/gif;base64,R0lGODlhAQABAID/AMDAwAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==">',
branches = $tree.find('li').prepend(placeholder);
self.items = $tree.find('a').prepend($(placeholder).addClass('icon'));
branches.each(function() {
var container = $(this).find('> ul').addClass('container');
if (container[0]) {
$(this).addClass('folderish')
.children('img').addClass('arrow');
}
});
},
/*
* Converts a json input into a <ul> tree
* @param json, a json object
* @return tree, the ul tree
*/
build_from_JSON: function(json) {
var tree = $('<ul class="root container"><ul/>'),
stack = [];
stack.push($(json));
//Depth First Search
while(stack[0]){
currentnode = stack.shift();
$.each(currentnode, function(i, node){
//lets fletch the json attrs
attr = attr_instancer(json_attr, node);
//node markup
li = $('<li><a href="#">' + this.title + '</a></li>');
li.find('> a').addClass(node.metatype)
.attr(attr);
tree.append(li);
if (node.children){
//has children, then is a container.
tree = tree.find('li:last').append('<ul/>')
.find('> ul');
stack.push(node.children);
} else {
if (node.folderish){
tree.find('li:last').append('<ul/>')
.find('> ul')
.addClass('container');
}
}
});
}
tree = tree.hasClass('root') ? tree : tree.parents('.root');
return tree;
},
/*
* Manage the actions to do when an element of the tree is "clicked"
* @param e, an event handler
*/
click: function(e){
var $this = $(e.currentTarget),
container = $this.siblings('.container'),
branch = $this.parent('.folderish');
//bind the trigger event for close and open
//and manage the ajax handler
if (container[0]) {
if (container.html() === '' && conf.ajax_handler) {
//ajax call
self.ajax_call($this, branch);
} else {
self.slide(container);
}
} else {
conf.action_handler($this);
}
},
/*
* Hides and shows an element, uses the current state of
* the objective to apply the effect.
* @param container, a html element to hide/show
*/
slide: function(container) {
var branch = container.parent('.folderish');
if (container.css('display') == 'none') {
container.slideDown('fast', function() {
branch.addClass('opened');
});
} else {
container.slideUp('fast', function() {
branch.removeClass('opened');
});
}
},
/*
* Takes the ajax_handler function and extends a default set to do
* a custom ajax call. The results are going to be passed again to
* the simplejqtree plugin
* @param trigger
* @param branch
*/
ajax_call: function(trigger, branch){
//lets make an instantiation of the ajax_handler function if exists
if ($.isFunction(conf.ajax_handler.data) || conf.ajax_handler.data_back) {
conf.ajax_handler.data_back = conf.ajax_handler.data_back ? conf.ajax_handler.data_back : conf.ajax_handler.data;
conf.ajax_handler.data = conf.ajax_handler.data_back(trigger);
}
var ajax_extended = $.extend(conf.ajax_handler, {
'dataType': 'json',
'success': function(data) {
var result = self.build_from_JSON(data);
$(branch).find('> ul').remove();
branch.append(result);
result.simplejqtree(conf);
self.slide(result);
}
});
$.ajax(ajax_extended);
}
});
//adjust markup
self.markup(item);
//events setup
self.items.each(function(){
var $this = $(this);
$this.bind('click.simplejqtree', function(event) {
//TODO we can mantain a list of nodes in memory, then access those nodes
//using an index, in that way we can save some instantiations and
//jquery traversing
self.click(event);
return event.preventDefault();
});
//little arrows should launch the click event
$this.siblings('.arrow').click(function() {
$this.trigger('click.simplejqtree');
});
});
}
// jQuery plugin implementation
$.fn.simplejqtree = function(options) {
// already instanced, return the data object
var el = this.data("simplejqtree");
if (el) { return el; }
//default settings, maybe its a good idea move this to a general conf
var settings = {
'ajax_handler': {}, //the ajax method used to do the ajax call
'action_handler': {}, //the action to trigger when a non-folderish item is "clicked"
'json_attr':{
'id':'id',
'href':'href',
'rel':'rel'
}
};
if (options) {
$.extend(settings, options);
}
return this.each(function() {
el = new SimpleJqTree($(this), settings);
$(this).data("simplejqtree", el);
});
};
})(jQuery);