聚合物1.0.5:选择下拉菜单中不起作用

本文介绍了聚合物1.0.5:选择下拉菜单中不起作用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

如果需要，我似乎无法设置默认的选定选项.阅读文档，但除标签作品外，不要阅读其他属性.

I can't seem to set a default selected option, if needed. Read the docs but no other properties, except for label works.

<paper-dropdown-menu label="I Love:"> <paper-menu class="dropdown-content" selectedItem="Heroes Reborn"> <paper-item>Teen Wolf</paper-item> <paper-item>Heroes Reborn</paper-item> <paper-item>Once Upon a Time</paper-item> </paper-menu> </paper-dropdown-menu>

无论我是否在paper-item value="x"上设置一个值，<paper-menu selected="x">都无用.我需要运行其他脚本吗?

No matter if I set a value on paper-item value="x" then <paper-menu selected="x"> nothing works. Do I need to run some other script?

推荐答案

选择设置为整数的设置应该可行.如果要选择第二项，请设置<paper-menu selected="1">.

Setting selected to an integer should work. If you want to select the second item set <paper-menu selected="1">.

如果要使用value而不是整数索引，请设置attr-for-selected="value"

If you want to use value instead of an integer index, set attr-for-selected="value"

<paper-menu attr-for-selected="value" selected="heroes" class="dropdown-content"> <paper-item value="teen">Teen Wolf</paper-item> <paper-item value="heroes">Heroes Reborn</paper-item> <paper-item value="once">Once Upon a Time</paper-item> </paper-menu>