/
multi-select-menu.html
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/
multi-select-menu.html
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<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-icon/iron-icon.html">
<link rel="import" href="../paper-menu-button/paper-menu-button.html">
<link rel="import" href="../paper-input/paper-input.html">
<link rel="import" href="../paper-menu/paper-menu.html">
<link rel="import" href="../paper-item/paper-item.html">
<!--
Paper card with a collapse/expand button in the header.
Collapsing will hide the content but keep the header
-->
<dom-module id="multi-select-menu">
<template>
<style>
:host {
--paper-item: {
padding: 0 0.5em;
};
}
:host iron-icon {
color: var(--secondary-text-color);
}
:host paper-menu-button {
padding: 0;
width: 100%;
}
:host .list-item {
cursor: pointer;
}
:host .list-item iron-icon {
margin-right: 0.5em;
}
:host .list-item:not(.iron-selected) iron-icon {
visibility: hidden;
}
:host #trigger {
--paper-input-container-input: {
cursor: pointer;
};
}
:host #filter {
--paper-input-container-label: {
padding: 0 1em;
};
--paper-input-container-input: {
padding: 0 1em;
};
}
:host .check-icon {
min-width: 1.7em;
min-height: 1.7em;
}
</style>
<paper-menu-button ignore-select vertical-offset="50"
on-paper-dropdown-close="_clearFilter"
on-paper-dropdown-open="_focusFilter">
<div class="dropdown-trigger">
<!-- Mimic paper-dropdown-menu trigger -->
<paper-input id="trigger" type="text" readonly label="[[label]]"
value="[[selectedText]]" invalid="{{invalid}}">
<iron-icon icon="arrow-drop-down" suffix></iron-icon>
</paper-input>
</div>
<div class="dropdown-content">
<paper-input id="filter" label="Filter the [[itemType]]"
value="{{filter}}" tabindex="0"></paper-input>
<paper-menu id="items" multi
on-iron-select="_updateSelectedValues"
on-iron-deselect="_updateSelectedValues">
<template is="dom-repeat" items="{{filteredItems}}" as="item">
<paper-item class="list-item" data-index$="{{item.index}}">
<iron-icon class="check-icon" icon="check"></iron-icon>
<span>[[item.value]]</span>
</paper-item>
</template>
</paper-menu>
</div>
</paper-menu-button>
</template>
<script>
(function() {
'use strict';
Polymer({
is: 'multi-select-menu',
properties: {
// items to select
items: {
type: Array,
value: function() {
return [];
}
},
// store original item indices so filtered selection works
itemIndices: {
type: Array,
computed: '_computeItemIndices(items)'
},
// type of items, used when selecting more than 1 item,
// e.g. "3 items" or "3 carrots"
itemType: {
type: String,
value: 'items'
},
// list filter text
filter: {
type: String,
value: '',
notify: true
},
// items filtered by the filter property
filteredItems: {
type: Array,
computed: '_computeFilteredItems(filter, itemIndices)'
},
// set the invalid state
invalid: {
type: Boolean,
value: false
},
// input label
label: {
type: String,
value: 'multi-select'
},
// gets and sets the selected values
selected: {
type: Array,
value: function() {
return [];
},
notify: true
},
// selected text is value if 1 item selected, else is count
selectedText: {
type: String,
value: '',
readOnly: true
}
},
observers: [
'_updateSelection(selected.*,items.*)'
],
_updateSelection: function() {
// set selected items
if (!this._noUpdate) {
var currentlySelectedIndices = [].concat(this.$.items.selectedValues || []);
var selectedIndices = (this.selected || []).map(function(item) {
return this.items.indexOf(item);
}, this);
// deselect currently selected indices that are not selected
var selectedIndicesThatStaySelected =
currentlySelectedIndices.filter(function(i) {
if (selectedIndices.indexOf(i) < 0) {
this.$.items.selectIndex(i);
} else {
return true;
}
}, this);
// select selected indices that aren't currently selected
selectedIndices.forEach(function(i) {
if (selectedIndicesThatStaySelected.indexOf(i) < 0) {
this.$.items.selectIndex(i);
}
}, this);
}
},
_clearFilter: function() {
// use timeout so it's cleared after menu hide animation
window.setTimeout(function() {
this.filter = '';
}.bind(this), 250);
},
_computeFilteredItems: function(filter, itemIndices) {
if (filter) {
// non-adjacent regex
var regex = new RegExp('.*' + filter.split('').join('.*') + '.*');
return itemIndices.filter(function(item) {
return regex.test(item.value);
});
} else {
return itemIndices;
}
},
_computeItemIndices: function(items) {
return items.map(function(item, i) {
return { value: item, index: i };
});
},
_focusFilter: function() {
// use timeout so menu is open and filter input can be focused
window.setTimeout(function() {
this.$.filter.focus();
}.bind(this), 250);
},
_updateSelectedValues: function() {
// get menu item selection indices
var filteredIndices = this.$.items.selectedValues || [];
// menu items could be filtered, so map to real indices
var selectedIndices = filteredIndices.map(function(i) {
return this.$.items.items[i].dataset.index;
}, this);
// map item indices to values
var selectedValues = selectedIndices.map(function(index) {
return this.items[index];
}, this);
// set selected items without triggering the observer
this._noUpdate = true;
this.set('selected', selectedValues);
this._noUpdate = false;
// set selection label based on how many items are selected
if (this.selected.length === 0) {
this._setSelectedText('');
} else if (this.selected.length === 1) {
this._setSelectedText(this.selected[0]);
} else {
this._setSelectedText(this.selected.length + ' ' + this.itemType);
}
}
});
})();
</script>
</dom-module>