当试图复制在我的apache2服务器上聚合物网站上运行如此出色的纸张下拉菜单时,出现此错误。当按下下拉按钮时。observe.js中的纸张下拉菜单错误
Exception caught during observer callback: TypeError: Cannot read property 'margin' of undefined
at core-dropdown-overlay.Polymer.positionTarget (http://localhost/components/core-dropdown/core-dropdown-overlay.html:125:26)
at core-dropdown-overlay.Polymer.updateTargetDimensions (http://localhost/components/core-overlay/core-overlay.html:445:12)
at core-dropdown-overlay.Polymer.prepareRenderOpened (http://localhost/components/core-overlay/core-overlay.html:347:14)
at core-dropdown-overlay.Polymer.openedChanged (http://localhost/components/core-overlay/core-overlay.html:306:12)
at core-dropdown-overlay.g.invokeMethod (http://localhost/components/polymer/polymer.js:12:13312)
at core-dropdown-overlay.g.notifyPropertyChanges (http://localhost/components/polymer/polymer.js:12:11598)
at Object.Observer.report_ (http://localhost/components/platform/platform.js:12:12614)
at Object.createObject.check_ (http://localhost/components/platform/platform.js:12:18112)
at c (http://localhost/components/platform/platform.js:12:5465)
HTML
<!doctype html>
<html>
<head>
<!-- Style Sheets -->
<!-- <LINK REL=StyleSheet HREF="css/viewer.css" TITLE="ViewerPage"> -->
<!-- Dependencies -->
<!-- Polymer Dependencies -->
<script src="components/platform/platform.js"></script>
<link rel="import" href="components/paper-dropdown-menu/paper-dropdown-menu.html">
<link rel="import" href="components/core-elements/core-elements.html">
<link rel="import" href="components/paper-elements/paper-elements.html">
</head>
<body>
<paper-dropdown-menu selected="Financier" valueattr="label">
<paper-item label="Croissant"></paper-item>
<paper-item label="Donut"></paper-item>
<paper-item label="Financier"></paper-item>
<paper-item label="Madeleine"></paper-item>
</paper-dropdown-menu>
</body>
</html>
当按下按钮时,没有其它的值可以看出或selected.It简单地呈现为与一些第一纸项可见的一个小盒子金融机构。
我已经安装了所有上述依赖使用鲍尔和聚合物上发现的命令,从我理解它应该为我处理依赖问题,所以我似乎不知道为什么我有上述错误。
编辑:
在进一步研究看来这行代码在部件是打破/芯下拉/芯下拉-overlay.html:125:26
var dims = this.dimensions;
var margin = dims.margin;
IMPOR对于子类来说,顺序很重要。我不知道在这种情况下它是否会有所帮助,但在导入“paper-elements.html”后,尝试在'paper-dropdown-menu.html'中输入import。 – 2014-10-01 23:49:49
即使使用股票纸菜单按钮演示(https://www.polymer-project.org/components/paper-menu-button/demo.html),我也会看到此错误。与OP一样,它仅在从本地Web服务器提供文件时才会发生。 – 2014-10-02 18:25:22
(与Polymer v0.4.1相同,与目前在聚合物项目网站上运行的相同。) – 2014-10-02 18:34:43