I tried adding it with like dropdownMenu.appendChild(menuItem) but as I expected this doesn't work. I couldn't find information about this on Polymer's guides nor other similar questions on here.
Is that possible? If so, how?
paper-dropdown-menu: https://elements.polymer-project.org/elements/paper-dropdown-menu
In Polymer, recommended way of manipulating the DOM is by manipulating the data:
var items_array = [....];
-create the menu as:
<paper-dropdown-menu label="Your favourite pastry">
<paper-listbox class="dropdown-content">
<template is="dom-repeat" items="{{items_array}}">
<paper-item>{{item}}</paper-item>
</template>
</paper-listbox>
</paper-dropdown-menu>
items_array
will affect the menu immediately. Found out the proper way from their docs :
Should select the Polymer element with: Polymer.dom(parent).querySelector(selector)
And append with: Polymer.dom(parent).appendChild(node)
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