1
我在這裏遇到問題,我需要將paper-tab
選擇與core-scaffold
中的core-pages
選擇綁定。聚合物:將核心支架內的紙張選項卡綁定到核心頁面
我已經嘗試Binding Paper-Tabs to Core-Pages with Polymer,而不是工作:
tabs.addEventListener('core-select',function()
{
pages.selected = tabs.selected;
console.log("Selected: " + tabs.selected);
});
返回控制檯上的錯誤:
tab is not found! index.html:147 Uncaught TypeError: Cannot read property 'addEventListener' of null
下面是從頁面的完整代碼:
<!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>
我有安裝了所需文件的最新版本。 在此先感謝您的幫助!
謝謝,我有一個問題,爲什麼這不是一個聚合物元件內工作; var tabs = document.querySelector('#ctabs'); 但這個工程; var tabs = this。$。ctabs; – RootInfinity 2014-10-30 23:47:05
如果您試圖訪問元素的影子DOM內的某些內容,「document.querySelector」不起作用,因爲它不是主文檔樹 - 它在影子DOM中。 您可以使用'/ deep /'combinator查找任何影子根內部的元素。 ('document.querySelector('html/deep/#ctabs');')。 Polymer元素中更有用的模式是使用這個'this。$'散列(就像你所擁有的),或者在影子DOM中創建一個容器並在容器上使用'querySelector'。這兩個描述在這裏:https://www.polymer-project.org/docs/polymer/polymer.html#automatic-node-finding – DocDude 2014-10-31 20:55:49