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unread-badge.html
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unread-badge.html
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<link rel="import" href="../polymer/polymer-element.html">
<dom-module id="unread-badge" class="empty">
<template>
<style>
:host(.empty) {
display: none !important;
}
:host {
display: inline-block;
padding: .25em .4em;
font-size: 75%;
font-weight: 700;
line-height: 1;
text-align: center;
white-space: nowrap;
vertical-align: baseline;
border-radius: .25rem;
color: #fff;
background-color: #dc3545;
}
</style>
[[value]]
</template>
<script>
/**
* `unread-badge`
*
*
* @customElement
* @polymer
* @demo demo/index.html
*/
class UnreadBadge extends Polymer.Element {
static get is() { return 'unread-badge'; }
static get properties() {
return {
value: {
type: String,
value: '',
observer: '_valueChanged'
}
};
}
_valueChanged(newValue, oldValue) {
this.value = newValue;
if (newValue) {
this.classList.remove("empty");
} else {
this.classList.add("empty");
}
}
}
window.customElements.define(UnreadBadge.is, UnreadBadge);
</script>
</dom-module>