polymerel / paper-dropdown-menu

A Material Design browser select element

Demo and API docs

##<paper-dropdown-menu>

Material design: Dropdown menus

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.

Example:

<paper-dropdown-menu label="Your favourite pastry">
  <paper-listbox class="dropdown-content">
    <paper-item>Croissant</paper-item>
    <paper-item>Donut</paper-item>
    <paper-item>Financier</paper-item>
    <paper-item>Madeleine</paper-item>
  </paper-listbox>
</paper-dropdown-menu>

This example renders a dropdown menu with 4 options.

The child element with the class dropdown-content is used as the dropdown menu. This can be a paper-listbox, or any other or element that acts like an iron-selector.

Specifically, the menu child must fire an iron-select event when one of its children is selected, and an iron-deselect event when a child is deselected. The selected or deselected item must be passed as the event's detail.item property.

Applications can listen for the iron-select and iron-deselect events to react when options are selected and deselected.

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.

##<paper-dropdown-menu-light>

Material design: Dropdown menus

This is a faster, lighter version of paper-dropdown-menu, that does not use a <paper-input> internally. Use this element if you're concerned about the performance of this element, i.e., if you plan on using many dropdowns on the same page. Note that this element has a slightly different styling API than paper-dropdown-menu.

paper-dropdown-menu-light is similar to a native browser select element. paper-dropdown-menu-light works with selectable content. The currently selected item is displayed in the control. If no item is selected, the label is displayed instead.

Example:

<paper-dropdown-menu-light label="Your favourite pastry">
  <paper-listbox class="dropdown-content">
    <paper-item>Croissant</paper-item>
    <paper-item>Donut</paper-item>
    <paper-item>Financier</paper-item>
    <paper-item>Madeleine</paper-item>
  </paper-listbox>
</paper-dropdown-menu-light>

This example renders a dropdown menu with 4 options.

The child element with the class dropdown-content is used as the dropdown menu. This can be a paper-listbox, or any other or element that acts like an iron-selector.

Specifically, the menu child must fire an iron-select event when one of its children is selected, and an iron-deselect event when a child is deselected. The selected or deselected item must be passed as the event's detail.item property.

Applications can listen for the iron-select and iron-deselect events to react when options are selected and deselected.

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-icon	A mixin that is applied to the internal icon	{}
--paper-dropdown-menu-disabled-opacity	The opacity of the dropdown when disabled	0.33
--paper-dropdown-menu-color	The color of the input/label/underline when the dropdown is unfocused	--primary-text-color
--paper-dropdown-menu-focus-color	The color of the label/underline when the dropdown is focused	--primary-color
--paper-dropdown-error-color	The color of the label/underline when the dropdown is invalid	--error-color
--paper-dropdown-menu-label	Mixin applied to the label	{}
--paper-dropdown-menu-input	Mixin appled to the input	{}

Note that in this element, the underline is just the bottom border of the "input". To style it:

<style is=custom-style>
  paper-dropdown-menu-light.custom {
    --paper-dropdown-menu-input: {
      border-bottom: 2px dashed lavender;
    };
</style>