我的期望是,一旦页面加载,默认情况下将选择"选项1".这不是正在发生的事情.相反,它显示标签,而不是基于纸张项值属性的选定选项.
<paper-dropdown-menu name="dropdown" label="Dropdown" selected='1' valueattr='value'>
<paper-dropdown class="dropdown">
<core-menu class="menu">
<paper-item value="1">Option 1</paper-item>
<paper-item value="2">Option 2</paper-item>
</core-menu>
</paper-dropdown>
</paper-dropdown-menu>
我需要从WSL中访问Virtualbox,我试过sudo apt-get install virtualbox但最终得到以下错误:
WARNING: The character device /dev/vboxdrv does not exist.
Please install the virtualbox-dkms package and the appropriate
headers, most likely linux-headers-3.4.0+.
You will not be able to start VMs until this problem is fixed.
4.3.36_Ubuntur105129