聚合物1.0.5:选择下拉菜单中不起作用 [英] Polymer 1.0.5: Select not working on paper-dropdown-menu
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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>
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