Polymer 聚合物:将纸标签绑定到核心支架内的核心页面
我这里有一个问题,我需要将Polymer 聚合物:将纸标签绑定到核心支架内的核心页面,polymer,paper-elements,core-elements,Polymer,Paper Elements,Core Elements,我这里有一个问题,我需要将纸张选项卡选择绑定到核心页面中核心支架的选择 我已经试过了,但不起作用: tabs.addEventListener('core-select',function() { pages.selected = tabs.selected; console.log("Selected: " + tabs.selected); }); 在控制台上返回错误: 找不到选项卡!index.html:147 未捕获的TypeError:无法读取null的属性“addEve
纸张选项卡
选择绑定到核心页面
中核心支架的选择
我已经试过了,但不起作用:
tabs.addEventListener('core-select',function()
{
pages.selected = tabs.selected;
console.log("Selected: " + tabs.selected);
});
在控制台上返回错误:
找不到选项卡!index.html:147
未捕获的TypeError:无法读取null的属性“addEventListener”
以下是页面中的完整代码:
<!doctype html>
<html>
<head>
<title>Test Page</title>
<meta name="viewport"
content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<script src="../components/platform/platform.js"></script>
<link rel="import" href="../components/polymer/polymer.html">
<link rel="import" href="../components/font-roboto/roboto.html">
<link rel="import" href="../components/core-header-panel/core-header-panel.html">
<link rel="import" href="../components/core-toolbar/core-toolbar.html">
<link rel="import" href="../components/paper-tabs/paper-tabs.html">
<link rel="import" href="../components/paper-button/paper-button.html">
<link rel="import" href="../components/paper-icon-button/paper-icon-button.html">
<link rel="import" href="../components/core-icons/core-icons.html">
<link rel="import" href="../components/core-drawer-panel/core-drawer-panel.html">
<link rel="import" href="../components/core-scaffold/core-scaffold.html">
<link rel="import" href="../components/core-menu/core-menu.html">
<link rel="import" href="../components/core-menu/core-submenu.html">
<link rel="import" href="../components/core-pages/core-pages.html">
<link rel="import" href="../components/core-item/core-item.html">
<link rel="import" href="../components/core-collapse/core-collapse.html">
<link rel="import" href="../components/core-style/core-style.html">
<style>
html,body {
height: 100%;
margin: 0;
background-color: #E5E5E5;
font-family: 'RobotoDraft', sans-serif;
}
.container {
width: 100%;
margin: 50px auto;
}
.heading {
padding: 10px 15px;
background-color: #f3f3f3;
border: 1px solid #dedede;
border-top-left-radius: 5px;
border-top-right-radius: 5px;
font-size: 18px;
cursor: pointer;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
-webkit-tap-highlight-color: rgba(0,0,0,0);
}
.content {
position: relative;
padding: 15px;
border: 1px solid #dedede;
border-top: none;
border-bottom-left-radius: 5px;
border-bottom-right-radius: 5px;
height:100vh;
}
@media (min-width: 481px) {
#tabs {
width: 200px;
}
.container {
width: 400px;
}
}
core-header-panel {
height: 100%;
overflow: auto;
-webkit-overflow-scrolling: touch;
}
core-toolbar {
background: #03a9f4;
color: white;
}
#ctabs {
width: 100%;
margin: 0;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
text-transform: uppercase;
}
</style>
</head>
<body unresolved>
<core-scaffold>
<core-header-panel navigation flex>
<core-toolbar id="navheader">
<span>Menu</span>
</core-toolbar>
<core-menu>
<core-submenu icon="settings" label="Select Level">
<core-submenu icon="settings" label="1">
</core-submenu>
</core-submenu>
</core-menu>
</core-header-panel>
<span tool>Learning Portal V1.0</span>
<div class="content">
<core-toolbar>
<paper-tabs id="ctabs" self-end selected="0">
<paper-tab name="all">All</paper-tab>
<paper-tab name="favorites">Favorites</paper-tab>
</paper-tabs>
</core-toolbar>
<core-pages selected="1" id="cpages">
<div>
<paper-button raised style="width: 150px; height: 150px"/>
</div>
<div>
<core-menu>
<core-submenu label="I. Units & Measurement">
<span>Data goes here!</span>
</core-submenu>
</core-menu>
</div>
</core-pages>
</div>
</core-scaffold>
<script>
var tabs = document.querySelector('ctabs');
var pages = document.getElementById('cpages');
if(!tabs)
{
console.log("tab is not found!");
}
if(tabs)
{
console.log("tab is found!");
}
tabs.addEventListener('core-select',function(){
pages.selected = tabs.selected;
console.log("Selected: " + tabs.selected);
});
//function myFunction() {
// console.log("Selected: " + tabs.selected);
//}
</script>
</body>
</html>
测试页
html,正文{
身高:100%;
保证金:0;
背景色:#E5;
字体系列:“RobotoDraft”,无衬线;
}
.集装箱{
宽度:100%;
保证金:50px自动;
}
.标题{
填充:10px 15px;
背景色:#F3;
边框:1px实心#dedede;
边框左上半径:5px;
边框右上角半径:5px;
字号:18px;
光标:指针;
-webkit用户选择:无;
-moz用户选择:无;
-ms用户选择:无;
用户选择:无;
-webkit点击高亮颜色:rgba(0,0,0,0);
}
.内容{
位置:相对位置;
填充:15px;
边框:1px实心#dedede;
边界顶部:无;
边框左下半径:5px;
边框右下半径:5px;
高度:100vh;
}
@介质(最小宽度:481px){
#标签{
宽度:200px;
}
.集装箱{
宽度:400px;
}
}
芯头面板{
身高:100%;
溢出:自动;
-webkit溢出滚动:触摸;
}
核心工具栏{
背景#03a9f4;
颜色:白色;
}
#CTAB{
宽度:100%;
保证金:0;
-webkit用户选择:无;
-moz用户选择:无;
-ms用户选择:无;
用户选择:无;
文本转换:大写;
}
菜单
学习门户V1.0
全部的
最爱
数据在这里!
var tabs=document.querySelector('ctab');
var pages=document.getElementById('cpages');
如果(!制表符)
{
log(“找不到选项卡!”);
}
如果(选项卡)
{
log(“找到选项卡!”);
}
tabs.addEventListener('core-select',function(){
pages.selected=tabs.selected;
console.log(“所选:”+选项卡。所选);
});
//函数myFunction(){
//console.log(“所选:”+选项卡。所选);
//}
我已经安装了最新版本和所需的文件。
提前感谢您的帮助 这不是聚合物问题;您的选择器错误:
var tabs = document.querySelector('ctabs');
应该是
var tabs = document. getElementById('ctabs');
或
谢谢,我还有另一个问题,为什么这在聚合物元素中不起作用;var tabs=document.querySelector(“#ctab”);但这是可行的;var tabs=此。$.ctab<如果试图访问元素的影子DOM中的内容,则code>document.querySelector不起作用,因为它不是主文档树,而是在影子DOM中。您可以使用
/deep/
组合器查找任何阴影根中的元素。(document.querySelector('html/deep/#ctab');
)。聚合元素中更有用的模式是使用thisthis.$
hash(如您所拥有的),或者在您的影子DOM中创建一个容器,并在容器上使用querySelector
。这里描述了这两种情况:
var tabs = document.querySelector('#ctabs');