如果在阵列中找不到过滤器,有人可以帮助如何显示此模板.
<template is="dom-if" if="{{itemsEmpty}}">
The array is empty!
</template>
这是我的整个代码.但由于某些原因,dom-if模板中的if条件不起作用
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src='bower_components/webcomponentsjs/webcomponents-lite.min.js'></script>
<link rel="import" href="bower_components/polymer/polymer.html">
<link rel="import" href="bower_components/iron-image/iron-image.html">
<!--<link rel="import" href="bower_components/iron-ajax/iron-ajax.html">-->
<link rel="import" href="bower_components/paper-item/paper-item.html">
<link rel="import" href="bower_components/paper-input/paper-input.html">
<link rel="import" href="bower_components/paper-dropdown-menu/paper-dropdown-menu.html">
<link rel="import" href="bower_components/paper-listbox/paper-listbox.html">
<link rel="import" href="bower_components/paper-button/paper-button.html">
<style>
.taller{
height:120px;
}
[vertical-align="top"] ul {
margin-top: 0;
}
[vertical-align="bottom"] ul {
margin-bottom: 0;
}
button, paper-button {
border: 1px solid #ccc;
background-color: #eee;
/*padding: 1em;*/
border-radius: 3px;
cursor: pointer;
}
button:focus {
outline: none;
border-color: blue; …