controllets/tree-view-controllet/tree-view-controllet.html

<link rel="import" href="../../bower_components/polymer/polymer.html" />
<link rel="import" href="../../bower_components/iron-collapse/iron-collapse.html">
<link rel="import" href="../../bower_components/paper-menu/paper-menu.html">
<link rel="import" href="../../bower_components/paper-menu/paper-submenu.html">
<link rel="import" href="../../bower_components/paper-item/paper-item.html">
<dom-module id="tree-view-controllet">
    <style is="custom-style">
        --paper-item {
        }
        paper-item {
            font-family: 'Roboto', 'Helvetica Neue', Helvetica, Arial, sans-serif;
            cursor: pointer;
        }
        paper-item.menu-trigger {
            font-weight: 700;
        }
        paper-item.menu-trigger.iron-selected {
            background-color: #B6B6B6;
        }
        paper-item:not(.menu-trigger).iron-selected {
            background-color: #2196F3;
            color: #FFFFFF;
        }
        .sublist {
            padding-left: 20px;
            padding-right: 20px;
        }
        :host{
            --paper-menu-focused-item-after: {
                 opacity: 0;
            };
        }
    </style>
    <template>
        <paper-menu id="paper_tree"></paper-menu>
    </template>
    <script>
        Polymer({
            is : 'tree-view-controllet',
            properties : {
                rootName : {
                    type  : String,
                    value : "root"
                },
                jsonData : {
                    type  : Object,
                    value : undefined
                },
                selectedFields : {
                    type  : Array,
                    value : []
                },
                preselectedFields : {
                    type : Array,
                    value : []
                },
                openedPath : {
                    type : String,
                    value : undefined
                }
            },
            listeners: {
                'iron-select': '_onSelect',
                'iron-deselect': '_onDeselect'
            },
            ready : function() {
                if(this.jsonData)
                    this._init();
            },
            getFields : function() {
                return this.selectedFields;
            },
            getFlatFields : function() {
                var fields = [];
                for(var A in this.selectedFields)
                    for(var e in this.selectedFields[A])
                        fields.push(this.selectedFields[A][e]);
                return fields;
            },
            _init : function() {
                this._injectBoundHTML(this._initCreateTree(this.rootName, this.jsonData), this.$.paper_tree);
                this._preselectFields();
                this._openPath();
            },
            _injectBoundHTML : function(html, element) {
                var template = document.createElement('template');
                template.innerHTML = html;
                var fragment = this.instanceTemplate(template);
                if (element) {
                    element.textContent = '';
                    element.appendChild(fragment);
                }
                return fragment;
            },
            _initCreateTree : function(nodeName, node) {
//                var list  = new Array();
//                for(var child in node)
//                    list.push(this._createTree(child, node[child]));
//                return this._paper_submenu(nodeName, list);
                var list  = new Array();
                if(node.constructor == Array)
                    for(var child in node[0])
                        list.push(this._createTree(nodeName+","+child, node[0][child]));
                else
                    for(var child in node)
                        list.push(this._createTree(child, node[child]));
                return this._paper_submenu(nodeName, list);
            },
            _createTree : function(nodeName, node) {
                var html = "";
                if(!node){
                    html = nodeName;
                }
                else if(node.constructor == Object){
                    var list  = new Array();
                    for(var child in node)
                        list.push(this._createTree(nodeName+","+child, node[child]));
                    html = this._paper_submenu(nodeName, list);
                }
                else if (node.constructor == Array){
                    var list  = new Array();
                    if(node[0].constructor == Object){
                        for(var child in node[0])
                            list.push(this._createTree(nodeName+","+child, node[0][child]));
                        html = this._paper_submenu(nodeName, list);
                    }
                    else{
                        html = nodeName;
                    }
                }
                else{
                    html = nodeName;
                }
                return html;
            },
            _paper_submenu : function(str, list) {
                var submenu = "<paper-submenu>";
                submenu += "<paper-item class=\"menu-trigger\">"+this._getName(str)+"</paper-item>" + "<paper-menu id=\""+str+"\" class=\"menu-content sublist\" multi>";
                for(var i in list){
                    if(list[i].indexOf("paper-submenu") != -1)
                        submenu += list[i];
                    else
                        submenu += this._paper_item(list[i]);
                }
                submenu += "</paper-menu>" + "</paper-submenu>";
                return submenu;
            },
            _paper_item : function(str){
                return "<paper-item id=\""+str+"\">"+this._getName(str)+"</paper-item>";
            },
            _getName : function (str){
                str = str.split(",");
                return str[str.length-1];
            },
            _preselectFields : function() {
                if (this.preselectedFields){
                    for(var field in this.preselectedFields){
                        var fieldId = this.preselectedFields[field];
                        var menuId = this.rootName;
                        if (fieldId.lastIndexOf(",") != -1)
                            menuId = fieldId.substring(0, fieldId.lastIndexOf(","));
                        var menu = document.getElementById(menuId);
                        var field = document.getElementById(fieldId);
                        var index = menu.items.indexOf(field);
                        menu.select(index);
                    }
                }
            },
            _openPath : function() {
                this.$.paper_tree.firstChild.open();
                if (this.openedPath) {
                    var openedPath = this.openedPath;
                    var nodes = openedPath.split(",");
                    openedPath = "";
                    while (nodes.length != 0) {
                        openedPath += nodes.splice(0, 1);
                        var menu = document.getElementById(openedPath);
                        var submenu = menu.parentNode.parentNode;
                        submenu.open();
                        openedPath += ",";
                    }
                }
            },
            _onSelect : function(e) {
                this._updateSelectedFields(e);
            },
            _onDeselect : function(e) {
                this._updateSelectedFields(e);
            },
            _updateSelectedFields : function(e) {
                var menuId = e.target.id;
                var selectedIds = [];
                var selectedItems = (e.target).selectedItems;
                for(var item in selectedItems){
                    var id = selectedItems[item].id;
                    if(id != "")//submenu
                        selectedIds.push(id);
                }
                var prevLength;
                if(this.selectedFields[menuId])
                    prevLength = this.selectedFields[menuId].length;
                else
                    prevLength = 0;
                var currLength = selectedIds.length
                if(prevLength != currLength) {
                    if (selectedIds.length)
                        this.selectedFields[menuId] = selectedIds;
                    else
                        delete this.selectedFields[menuId];
                    this.fire('tree-view-controllet_selected-fields', {fields: this.getFlatFields()});
                }
            }
        });
    </script>
</dom-module>