我的下一步是尝试使用< template is =“dom-repeat”>动态构建我的菜单.迭代任意数组菜单项的元素.菜单正确呈现(我可以看到绑定到数组的所有菜单项),但我无法点击这些项目,也没有显示铁页面.似乎用于attr-for-selected的data-category属性在< template is =“dom-repeat”>内部不起作用.
我可以通过哪些方式实现这一目标？
编辑：删除attr-for-selected属性并使用索引工作切换铁页,但在我的情况下,依赖于数组的索引不是一个选项.
我的index.HTML如下：
<!DOCTYPE HTML><HTML><head><Meta charset="UTF-8"><Meta name="vIEwport" content="wIDth=device-wIDth,minimum-scale=1.0,initial-scale=1.0,user-scalable=yes"><Meta name="mobile-web-app-capable" content="yes"><Meta name="apple-mobile-web-app-capable" content="yes"><Title>My Test</Title><script src="bower_components/webcomponentsJs/webcomponents-lite.min.Js"></script><link rel="import" href="bower_components/polymer/polymer.HTML"><link rel="import" href="bower_components/iron-icons/iron-icons.HTML"><link rel="import" href="bower_components/iron-pages/iron-pages.HTML"><link rel="import" href="bower_components/paper-drawer-panel/paper-drawer-panel.HTML"><link rel="import" href="bower_components/paper-toolbar/paper-toolbar.HTML"><link rel="import" href="bower_components/paper-header-panel/paper-header-panel.HTML"><link rel="import" href="bower_components/paper-icon-button/paper-icon-button.HTML"><link rel="import" href="bower_components/paper-item/paper-item.HTML"><link rel="import" href="bower_components/paper-styles/paper-styles.HTML"><link rel="import" href="bower_components/paper-menu/paper-menu.HTML"><style></style></head><body><my-app></my-app><dom-module ID="my-app"><style></style><template><paper-drawer-panel> <paper-header-panel drawer > <paper-toolbar> <div>Drawer</div> </paper-toolbar> <paper-menu selected="{{page}}" attr-for-selected="data-category"> <!-- This works --><!-- <paper-item data-category="item1" label="item1"> <span>John Smith</span> </paper-item> <paper-item data-category="item2" label="item2"> <span>Jane Doe</span> </paper-item>--> <!-- This does not work --> <template is="dom-repeat" items="{{names}}"> <paper-item data-category="{{item.itemNum}}" label="{{item.itemNum}}"> <span>{{item.first}}</span><span>{{item.last}}</span><span>{{item.itemNum}}</span> </paper-item> </template> </paper-menu> </paper-header-panel> <paper-header-panel main > <paper-toolbar> <paper-icon-button icon="menu" paper-drawer-toggle></paper-icon-button> <div >Main Content</div> </paper-toolbar> <iron-pages selected="{{page}}" attr-for-selected="data-category"> <section data-category="item1"> <h1>Item 1</h1> <div>Item 1 content...</div> </section> <section data-category="item2"> <h1>Item 2</h1> <div>Item 2 content...</div> </section> </iron-pages> </paper-header-panel></paper-drawer-panel></template><script>polymer({ is: "my-app",ready: function() { this.names = [{itemNum: "item1",first: "John",last: "Smith"},{itemNum: "item2",first: "Jane",last: "Doe"}]; }});</script></dom-module></body></HTML>解决方法 从文档中尝试< paper-item data-category $=“{{item.itemNum}}”label $=“{{item.itemNum}}”>,这将调用paper-item.setAttribute(‘data -category’,itemNum)而不是paper-item.data-category = itemNum. https://www.polymer-project.org/1.0/docs/devguide/data-binding.html#attribute-binding
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