我试图创建一个可切换的菜单,但由于某种原因隐藏的属性不起作用。它不适用于任何值,所以我不认为它是一个数据绑定问题。
我在我的项目的其他部分和其他javascript liberies和框架中使用这种方法,它永远不会变得更复杂,所以我看不到我做错了什么。
任何想法?
<link rel="import" href="../../bower_components/polymer/polymer.html">
<link rel="import" href="../../bower_components/polymerfire/firebase-auth.html">
<link rel="import" href="../../bower_components/paper-menu/paper-menu.html">
<link rel="import" href="../../bower_components/paper-item/paper-item.html">
<dom-module id="user-account-menu">
<template>
<style>
img {
width: 72px;
height: 72px;
}
paper-menu {
position: absolute;
right: 15px;
width: 200px;
background: #A3A3A3;
}
</style>
<firebase-auth
id="auth"
signed-in="{{signedIn}}"
user="{{user}}">
</firebase-auth>
<!-- start the account dropdon -->
<div>
<img src="{{computePhotoURL()}}">
<paper-menu hidden$="{{show}}">
<paper-item>This is a menu item</paper-item>
<paper-item>[[show]]</paper-item>
</paper-menu>
</div>
</template>
<script>
Polymer({
is: 'user-account-menu',
properties: {
show: {
type: Boolean,
value: true
}
},
computePhotoURL: function() {
// get the users photo, if one doesn't exist,
// get the default user avatar
var photo;
try {
photo = this.user.photoURL;
return photo;
} catch(err) {
return 'https://developers.google.com/experts/img/user/user-default.png';
}
},
});
</script>
</dom-module>
更新(从DOM纸菜单的CSS):
element.style {
}
<style>…</style>
paper-menu {
position: absolute;
right: 15px;
width: 200px;
background: #A3A3A3;
}
<style>…</style>
:host {
display: block;
padding: 8px 0;
background: #ffffff;
color: #212121;
您是否调查过DOM并检查是否删除了“hidden”属性? –
它确实有一个* <纸菜单角色=“菜单”tabindex =“0”隐藏=“”> * –
而当你切换的价值,它被删除,它会被删除? –