| <!-- |
| Copyright 2013 The Polymer Authors. All rights reserved. |
| Use of this source code is governed by a BSD-style |
| license that can be found in the LICENSE file. |
| --> |
| <!-- |
| /** |
| * @module Polymer Elements |
| */ |
| /** |
| * polymer-selector is used to manage a list of elements that can be selected. |
| * The attribute "selected" indicates which item element is being selected. |
| * The attribute "multi" indicates if multiple items can be selected at once. |
| * Tapping on the item element would fire "polymer-activate" event. Use |
| * "polymer-select" event to listen for selection changes. |
| * |
| * Example: |
| * |
| * <polymer-selector selected="0"> |
| * <div>Item 1</div> |
| * <div>Item 2</div> |
| * <div>Item 3</div> |
| * </polymer-selector> |
| * |
| * polymer-selector is not styled. So one needs to use "polymer-selected" CSS |
| * class to style the selected element. |
| * |
| * <style> |
| * .item.polymer-selected { |
| * background: #eee; |
| * } |
| * </style> |
| * ... |
| * <polymer-selector> |
| * <div class="item">Item 1</div> |
| * <div class="item">Item 2</div> |
| * <div class="item">Item 3</div> |
| * </polymer-selector> |
| * |
| * @class polymer-selector |
| * @status stable |
| */ |
| /** |
| * Fired when an item's selection state is changed. This event is fired both |
| * when an item is selected or deselected. The `isSelected` detail property |
| * contains the selection state. |
| * |
| * @event polymer-select |
| * @param {Object} detail |
| * @param {boolean} detail.isSelected true for selection and false for deselection |
| * @param {Object} detail.item the item element |
| */ |
| /** |
| * Fired when an item element is tapped. |
| * |
| * @event polymer-activate |
| * @param {Object} detail |
| * @param {Object} detail.item the item element |
| */ |
| --> |
| <link rel="import" href="../polymer/polymer.html"> |
| <link rel="import" href="../polymer-selection/polymer-selection.html"> |
| |
| <polymer-element name="polymer-selector" |
| attributes="selected multi valueattr selectedClass selectedProperty selectedAttribute selectedItem selectedModel selectedIndex notap target itemsSelector activateEvent"> |
| <template> |
| <polymer-selection id="selection" multi="{{multi}}" on-polymer-select="{{selectionSelect}}"></polymer-selection> |
| <content id="items" select="*"></content> |
| </template> |
| <script> |
| Polymer('polymer-selector', { |
| /** |
| * Gets or sets the selected element. Default to use the index |
| * of the item element. |
| * |
| * If you want a specific attribute value of the element to be |
| * used instead of index, set "valueattr" to that attribute name. |
| * |
| * Example: |
| * |
| * <polymer-selector valueattr="label" selected="foo"> |
| * <div label="foo"></div> |
| * <div label="bar"></div> |
| * <div label="zot"></div> |
| * </polymer-selector> |
| * |
| * In multi-selection this should be an array of values. |
| * |
| * Example: |
| * |
| * <polymer-selector id="selector" valueattr="label" multi> |
| * <div label="foo"></div> |
| * <div label="bar"></div> |
| * <div label="zot"></div> |
| * </polymer-selector> |
| * |
| * this.$.selector.selected = ['foo', 'zot']; |
| * |
| * @attribute selected |
| * @type Object |
| * @default null |
| */ |
| selected: null, |
| /** |
| * If true, multiple selections are allowed. |
| * |
| * @attribute multi |
| * @type boolean |
| * @default false |
| */ |
| multi: false, |
| /** |
| * Specifies the attribute to be used for "selected" attribute. |
| * |
| * @attribute valueattr |
| * @type string |
| * @default 'name' |
| */ |
| valueattr: 'name', |
| /** |
| * Specifies the CSS class to be used to add to the selected element. |
| * |
| * @attribute selectedClass |
| * @type string |
| * @default 'polymer-selected' |
| */ |
| selectedClass: 'polymer-selected', |
| /** |
| * Specifies the property to be used to set on the selected element |
| * to indicate its active state. |
| * |
| * @attribute selectedProperty |
| * @type string |
| * @default '' |
| */ |
| selectedProperty: '', |
| /** |
| * Specifies the property to be used to set on the selected element |
| * to indicate its active state. |
| * |
| * @attribute selectedProperty |
| * @type string |
| * @default 'active' |
| */ |
| selectedAttribute: 'active', |
| /** |
| * Returns the currently selected element. In multi-selection this returns |
| * an array of selected elements. |
| * |
| * @attribute selectedItem |
| * @type Object |
| * @default null |
| */ |
| selectedItem: null, |
| /** |
| * In single selection, this returns the model associated with the |
| * selected element. |
| * |
| * @attribute selectedModel |
| * @type Object |
| * @default null |
| */ |
| selectedModel: null, |
| /** |
| * In single selection, this returns the selected index. |
| * |
| * @attribute selectedIndex |
| * @type number |
| * @default -1 |
| */ |
| selectedIndex: -1, |
| /** |
| * The target element that contains items. If this is not set |
| * polymer-selector is the container. |
| * |
| * @attribute target |
| * @type Object |
| * @default null |
| */ |
| target: null, |
| /** |
| * This can be used to query nodes from the target node to be used for |
| * selection items. Note this only works if the 'target' property is set. |
| * |
| * Example: |
| * |
| * <polymer-selector target="{{$.myForm}}" itemsSelector="input[type=radio]"></polymer-selector> |
| * <form id="myForm"> |
| * <label><input type="radio" name="color" value="red"> Red</label> <br> |
| * <label><input type="radio" name="color" value="green"> Green</label> <br> |
| * <label><input type="radio" name="color" value="blue"> Blue</label> <br> |
| * <p>color = {{color}}</p> |
| * </form> |
| * |
| * @attribute itemSelector |
| * @type string |
| * @default '' |
| */ |
| itemsSelector: '', |
| /** |
| * The event that would be fired from the item element to indicate |
| * it is being selected. |
| * |
| * @attribute activateEvent |
| * @type string |
| * @default 'tap' |
| */ |
| activateEvent: 'tap', |
| notap: false, |
| ready: function() { |
| this.activateListener = this.activateHandler.bind(this); |
| this.observer = new MutationObserver(this.updateSelected.bind(this)); |
| if (!this.target) { |
| this.target = this; |
| } |
| }, |
| get items() { |
| var nodes = this.target !== this ? (this.itemsSelector ? |
| this.target.querySelectorAll(this.itemsSelector) : |
| this.target.children) : this.$.items.getDistributedNodes(); |
| return Array.prototype.filter.call(nodes || [], function(n) { |
| return n && n.localName !== 'template'; |
| }); |
| }, |
| targetChanged: function(old) { |
| if (old) { |
| this.removeListener(old); |
| this.observer.disconnect(); |
| } |
| if (this.target) { |
| this.addListener(this.target); |
| this.observer.observe(this.target, {childList: true}); |
| } |
| }, |
| addListener: function(node) { |
| node.addEventListener(this.activateEvent, this.activateListener); |
| }, |
| removeListener: function(node) { |
| node.removeEventListener(this.activateEvent, this.activateListener); |
| }, |
| get selection() { |
| return this.$.selection.getSelection(); |
| }, |
| selectedChanged: function() { |
| this.updateSelected(); |
| }, |
| updateSelected: function() { |
| this.validateSelected(); |
| if (this.multi) { |
| this.clearSelection(); |
| this.selected && this.selected.forEach(function(s) { |
| this.valueToSelection(s); |
| }, this); |
| } else { |
| this.valueToSelection(this.selected); |
| } |
| }, |
| validateSelected: function() { |
| // convert to an array for multi-selection |
| if (this.multi && !Array.isArray(this.selected) && |
| this.selected !== null && this.selected !== undefined) { |
| this.selected = [this.selected]; |
| } |
| }, |
| clearSelection: function() { |
| if (this.multi) { |
| this.selection.slice().forEach(function(s) { |
| this.$.selection.setItemSelected(s, false); |
| }, this); |
| } else { |
| this.$.selection.setItemSelected(this.selection, false); |
| } |
| this.selectedItem = null; |
| this.$.selection.clear(); |
| }, |
| valueToSelection: function(value) { |
| var item = (value === null || value === undefined) ? |
| null : this.items[this.valueToIndex(value)]; |
| this.$.selection.select(item); |
| }, |
| updateSelectedItem: function() { |
| this.selectedItem = this.selection; |
| }, |
| selectedItemChanged: function() { |
| if (this.selectedItem) { |
| var t = this.selectedItem.templateInstance; |
| this.selectedModel = t ? t.model : undefined; |
| } else { |
| this.selectedModel = null; |
| } |
| this.selectedIndex = this.selectedItem ? |
| parseInt(this.valueToIndex(this.selected)) : -1; |
| }, |
| valueToIndex: function(value) { |
| // find an item with value == value and return it's index |
| for (var i=0, items=this.items, c; (c=items[i]); i++) { |
| if (this.valueForNode(c) == value) { |
| return i; |
| } |
| } |
| // if no item found, the value itself is probably the index |
| return value; |
| }, |
| valueForNode: function(node) { |
| return node[this.valueattr] || node.getAttribute(this.valueattr); |
| }, |
| // events fired from <polymer-selection> object |
| selectionSelect: function(e, detail) { |
| this.updateSelectedItem(); |
| if (detail.item) { |
| this.applySelection(detail.item, detail.isSelected); |
| } |
| }, |
| applySelection: function(item, isSelected) { |
| if (this.selectedClass) { |
| item.classList.toggle(this.selectedClass, isSelected); |
| } |
| if (this.selectedProperty) { |
| item[this.selectedProperty] = isSelected; |
| } |
| if (this.selectedAttribute && item.setAttribute) { |
| if (isSelected) { |
| item.setAttribute(this.selectedAttribute, ''); |
| } else { |
| item.removeAttribute(this.selectedAttribute); |
| } |
| } |
| }, |
| // event fired from host |
| activateHandler: function(e) { |
| if (!this.notap) { |
| var i = this.findDistributedTarget(e.target, this.items); |
| if (i >= 0) { |
| var item = this.items[i]; |
| var s = this.valueForNode(item) || i; |
| if (this.multi) { |
| if (this.selected) { |
| this.addRemoveSelected(s); |
| } else { |
| this.selected = [s]; |
| } |
| } else { |
| this.selected = s; |
| } |
| this.asyncFire('polymer-activate', {item: item}); |
| } |
| } |
| }, |
| addRemoveSelected: function(value) { |
| var i = this.selected.indexOf(value); |
| if (i >= 0) { |
| this.selected.splice(i, 1); |
| } else { |
| this.selected.push(value); |
| } |
| this.valueToSelection(value); |
| }, |
| findDistributedTarget: function(target, nodes) { |
| // find first ancestor of target (including itself) that |
| // is in nodes, if any |
| while (target && target != this) { |
| var i = Array.prototype.indexOf.call(nodes, target); |
| if (i >= 0) { |
| return i; |
| } |
| target = target.parentNode; |
| } |
| } |
| }); |
| </script> |
| </polymer-element> |
