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controllets/dataset-selection-controllet/paper-input-search.html 15.6 KB
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  <!--
  @license
  Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
  This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
  The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
  The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
  Code distributed by Google as part of the polymer project is also
  subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  -->
  
  <link rel="import" href="../../bower_components/polymer/polymer.html">
  <link rel="import" href="../../bower_components/paper-styles/default-theme.html">
  <link rel="import" href="../../bower_components/paper-input/paper-input.html">
  <link rel="import" href="../../bower_components/paper-menu-button/paper-menu-button.html">
  <link rel="import" href="../../bower_components/paper-ripple/paper-ripple.html">
  <link rel="import" href="../../bower_components/iron-a11y-keys-behavior/iron-a11y-keys-behavior.html">
  <link rel="import" href="../../bower_components/iron-behaviors/iron-control-state.html">
  <link rel="import" href="../../bower_components/iron-behaviors/iron-button-state.html">
  <link rel="import" href="../../bower_components/iron-icons/iron-icons.html">
  <link rel="import" href="../../bower_components/iron-icon/iron-icon.html">
  <link rel="import" href="../../bower_components/iron-selector/iron-selectable.html">
  <link rel="import" href="../../bower_components/iron-form-element-behavior/iron-form-element-behavior.html">
  <link rel="import" href="../../bower_components/iron-validatable-behavior/iron-validatable-behavior.html">
  
  <!--
  Material design: [Dropdown menus](https://www.google.com/design/spec/components/buttons.html#buttons-dropdown-buttons)
  
  `paper-dropdown-menu` is similar to a native browser select element.
  `paper-dropdown-menu` works with selectable content. The currently selected
  item is displayed in the control. If no item is selected, the `label` is
  displayed instead.
  
  The child element with the class `dropdown-content` will be used as the dropdown
  menu. It could be a `paper-menu` or element that triggers `iron-select` when
  selecting its children.
  
  Example:
  
      <paper-dropdown-menu label="Your favourite pastry">
        <paper-menu class="dropdown-content">
          <paper-item>Croissant</paper-item>
          <paper-item>Donut</paper-item>
          <paper-item>Financier</paper-item>
          <paper-item>Madeleine</paper-item>
        </paper-menu>
      </paper-dropdown-menu>
  
  This example renders a dropdown menu with 4 options.
  
  Similarly to using `iron-select`, `iron-deselect` events will cause the
  current selection of the `paper-dropdown-menu` to be cleared.
  
  ### Styling
  
  The following custom properties and mixins are also available for styling:
  
  Custom property | Description | Default
  ----------------|-------------|----------
  `--paper-dropdown-menu` | A mixin that is applied to the element host | `{}`
  `--paper-dropdown-menu-disabled` | A mixin that is applied to the element host when disabled | `{}`
  `--paper-dropdown-menu-ripple` | A mixin that is applied to the internal ripple | `{}`
  `--paper-dropdown-menu-button` | A mixin that is applied to the internal menu button | `{}`
  `--paper-dropdown-menu-input` | A mixin that is applied to the internal paper input | `{}`
  `--paper-dropdown-menu-icon` | A mixin that is applied to the internal icon | `{}`
  
  You can also use any of the `paper-input-container` and `paper-menu-button`
  style mixins and custom properties to style the internal input and menu button
  respectively.
  
  @group Paper Elements
  @element paper-dropdown-menu
  @hero hero.svg
  @demo demo/index.html
  -->
  
  <dom-module id="paper-input-search">
      <style>
          :host {
              display: inline-block;
              position: relative;
              text-align: left;
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              cursor: pointer;
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              /* NOTE(cdata): Both values are needed, since some phones require the
               * value to be `transparent`.
               */
              -webkit-tap-highlight-color: rgba(0,0,0,0);
              -webkit-tap-highlight-color: transparent;
  
          --paper-input-container-input: {
               overflow: hidden;
               white-space: nowrap;
               text-overflow: ellipsis;
               max-width: 100%;
               box-sizing: border-box;
               /*cursor: pointer;*/
           };
  
          @apply(--paper-dropdown-menu);
          }
  
          :host([disabled]) {
          @apply(--paper-dropdown-menu-disabled);
          }
  
          :host([noink]) paper-ripple {
              display: none;
          }
  
          :host([no-label-float]) paper-ripple {
              top: 8px;
          }
  
          paper-ripple {
              top: 12px;
              left: 0px;
              bottom: 8px;
              right: 0px;
  
          @apply(--paper-dropdown-menu-ripple);
          }
  
          paper-menu-button {
              display: block;
              padding: 0;
          @apply(--paper-dropdown-menu-button);
          }
  
          paper-input {
          @apply(--paper-dropdown-menu-input);
          }
  
          iron-icon {
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              /*color: var(--disabled-text-color);*/
              color: #2196F3;
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          @apply(--paper-dropdown-menu-icon);
          }
  
      </style>
      <template>
          <paper-menu-button
                  id="menuButton"
                  vertical-align="top"
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                  horizontal-align="left"
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                  vertical-offset="[[_computeMenuVerticalOffset(noLabelFloat)]]"
                  disabled="[[disabled]]"
                  no-animations="[[noAnimations]]"
                  on-iron-select="_onIronSelect"
                  on-iron-deselect="_onIronDeselect"
                  opened="{{opened}}">
              <div class="dropdown-trigger">
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                  <!--<paper-ripple></paper-ripple>-->
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                  <paper-input
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                          id="inputField"
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                          invalid="[[invalid]]"
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                          value="{{inputValue}}"
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                          placeholder="[[placeholder]]"
                          always-float-label="[[alwaysFloatLabel]]"
                          no-label-float="[[noLabelFloat]]"
                          label="[[label]]">
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                      <iron-icon icon="search" prefix></iron-icon>
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                      <iron-icon icon="arrow-drop-down" suffix></iron-icon>
                  </paper-input>
              </div>
              <content id="content" select=".dropdown-content"></content>
          </paper-menu-button>
      </template>
  </dom-module>
  <script>
      (function() {
          'use strict';
  
          Polymer({
              is: 'paper-input-search',
  
              /**
               * Fired when the dropdown opens.
               *
               * @event paper-dropdown-open
               */
  
              /**
               * Fired when the dropdown closes.
               *
               * @event paper-dropdown-close
               */
  
              behaviors: [
                  Polymer.IronControlState,
                  Polymer.IronButtonState,
                  Polymer.IronFormElementBehavior,
                  Polymer.IronValidatableBehavior
              ],
  
              properties: {
                  /**
                   * The derived "label" of the currently selected item. This value
                   * is the `label` property on the selected item if set, or else the
                   * trimmed text content of the selected item.
                   */
                  selectedItemLabel: {
                      type: String,
                      notify: true,
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                      readOnly: true
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                  },
  
                  /**
                   * The last selected item. An item is selected if the dropdown menu has
                   * a child with class `dropdown-content`, and that child triggers an
                   * `iron-select` event with the selected `item` in the `detail`.
                   *
                   * @type {?Object}
                   */
                  selectedItem: {
                      type: Object,
                      notify: true,
                      readOnly: true
                  },
  
                  /**
                   * The value for this element that will be used when submitting in
                   * a form. It is read only, and will always have the same value
                   * as `selectedItemLabel`.
                   */
                  value: {
                      type: String,
                      notify: true,
                      readOnly: true
                  },
  
                  /**
                   * The label for the dropdown.
                   */
                  label: {
                      type: String
                  },
  
                  /**
                   * The placeholder for the dropdown.
                   */
                  placeholder: {
                      type: String
                  },
  
                  /**
                   * True if the dropdown is open. Otherwise, false.
                   */
                  opened: {
                      type: Boolean,
                      notify: true,
                      value: false
                  },
  
                  /**
                   * Set to true to disable the floating label. Bind this to the
                   * `<paper-input-container>`'s `noLabelFloat` property.
                   */
                  noLabelFloat: {
                      type: Boolean,
                      value: false,
                      reflectToAttribute: true
                  },
  
                  /**
                   * Set to true to always float the label. Bind this to the
                   * `<paper-input-container>`'s `alwaysFloatLabel` property.
                   */
                  alwaysFloatLabel: {
                      type: Boolean,
                      value: false
                  },
  
                  /**
                   * Set to true to disable animations when opening and closing the
                   * dropdown.
                   */
                  noAnimations: {
                      type: Boolean,
                      value: false
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                  },
  
                  inputValue: {
                      type: String,
                      value: undefined,
                      observer: '_fireInputValue'
                  },
  
                  fireInputValue: {
                      type: Boolean,
                      value: true,
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                  }
              },
  
              listeners: {
                  'tap': '_onTap'
              },
  
              keyBindings: {
                  'up down': 'open',
                  'esc': 'close'
              },
  
              hostAttributes: {
                  role: 'group',
                  'aria-haspopup': 'true'
              },
  
              observers: [
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  //                '_selectedItemChanged(selectedItem)'
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              ],
  
              attached: function() {
                  // NOTE(cdata): Due to timing, a preselected value in a `IronSelectable`
                  // child will cause an `iron-select` event to fire while the element is
                  // still in a `DocumentFragment`. This has the effect of causing
                  // handlers not to fire. So, we double check this value on attached:
                  var contentElement = this.contentElement;
                  if (contentElement && contentElement.selectedItem) {
                      this._setSelectedItem(contentElement.selectedItem);
                  }
              },
  
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              _fireInputValue: function() {//console.log(this.inputValue);
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                  if(this.fireInputValue) {//change NO DDL
                      this.fire('paper-input-search_input-value', {inputValue: this.inputValue});
                      if(this.contentElement.selectedItem){
  //                        this._setSelectedItem(null);
                          this.contentElement.select(-1);
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  //                        console.log("deselected");
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                      }
                  }
  
                  this.fireInputValue = true;
              },
  
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              /**
               * The content element that is contained by the dropdown menu, if any.
               */
              get contentElement() {
                  return Polymer.dom(this.$.content).getDistributedNodes()[0];
              },
  
              /**
               * Show the dropdown content.
               */
              open: function() {
                  this.$.menuButton.open();
              },
  
              /**
               * Hide the dropdown content.
               */
              close: function() {
                  this.$.menuButton.close();
              },
  
              /**
               * A handler that is called when `iron-select` is fired.
               *
               * @param {CustomEvent} event An `iron-select` event.
               */
              _onIronSelect: function(event) {
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  //                console.log("select");
                  this.fireInputValue = false;
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                  this._setSelectedItem(event.detail.item);
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                  this.inputValue = event.detail.item.label || event.detail.item.textContent.trim();
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              },
  
              /**
               * A handler that is called when `iron-deselect` is fired.
               *
               * @param {CustomEvent} event An `iron-deselect` event.
               */
              _onIronDeselect: function(event) {
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  //                console.log("deselect");
                  this.fireInputValue = false;
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                  this._setSelectedItem(null);
              },
  
              /**
               * A handler that is called when the dropdown is tapped.
               *
               * @param {CustomEvent} event A tap event.
               */
              _onTap: function(event) {
                  if (Polymer.Gestures.findOriginalTarget(event) === this) {
                      this.open();
                  }
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                  this.async(function(){this.$.inputField.$.input.focus();},200);//to improve
  //                console.log(this.selectedItemLabel);
  //                console.log(this.value);
  //                console.log(this.$.inputField.value);
  //                console.log(this.inputValue);
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              },
  
              /**
               * Compute the label for the dropdown given a selected item.
               *
               * @param {Element} selectedItem A selected Element item, with an
               * optional `label` property.
               */
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  //            _selectedItemChanged: function(selectedItem) {
  //                var value = '';
  //                if (!selectedItem) {
  //                    value = '';
  //                } else {
  //                    value = selectedItem.label || selectedItem.textContent.trim();
  //                }
  //
  //                this._setValue(value);
  //                this._setSelectedItemLabel(value);
  //                this.inputValue = selectedItem.label || selectedItem.textContent.trim();
  //            },
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              /**
               * Compute the vertical offset of the menu based on the value of
               * `noLabelFloat`.
               *
               * @param {boolean} noLabelFloat True if the label should not float
               * above the input, otherwise false.
               */
              _computeMenuVerticalOffset: function(noLabelFloat) {
                  // NOTE(cdata): These numbers are somewhat magical because they are
                  // derived from the metrics of elements internal to `paper-input`'s
                  // template. The metrics will change depending on whether or not the
                  // input has a floating label.
  //                return noLabelFloat ? -4 : 8;
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                  return noLabelFloat ? 46-4 : 46+8;
  //                return 64;
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              },
  
              /**
               * Returns false if the element is required and does not have a selection,
               * and true otherwise.
               * @return {Boolean} true if `required` is false, or if `required` is true
               * and the element has a valid selection.
               */
              _getValidity: function() {
                  return this.disabled || !this.required || (this.required && this.value);
              }
          });
      })();
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  </script>