polymer-dropdown-menu
我的HTML页面中有一个像这样的元素:
<script src="http://www.polymer-project.org/platform.js"></script>
<link rel="import" href="http://www.polymer-project.org/components/polymer/polymer.html">
<link rel="import" href="http://www.polymer-project.org/components/paper-button/paper-button.html">
<link rel="import" href="http://www.polymer-project.org/components/paper-dropdown-menu/paper-dropdown-menu.html">
<link rel="import" href="http://www.polymer-project.org/components/paper-dropdown/paper-dropdown.html">
<link rel="import" href="http://www.polymer-project.org/components/core-menu/core-menu.html">
<polymer-element name="sample">
<template>
<div>
<paper-dropdown-menu id="Combo" label="Process">
<paper-dropdown class="dropdown">
<core-menu class="menu">
<template repeat="{{processlist}}">
<paper-item>{{}}</paper-item>
</template>
</core-menu>
</paper-dropdown>
</paper-dropdown-menu>
</div>
<div>
<paper-button id="start_button" raised>Start</paper-button>
</div>
</template>
<script>
Polymer({
created: function() {
},
domReady: function() {
this.processlist = ["hi","hello"];
var self = this;
this.$.start_button.addEventListener('click', function () {
this.processlist=["hey","how","are","you"];
});
});
}
});
</script>
</polymer-element>
我需要在单击按钮时填充进程列表。我在按钮的事件侦听器函数中编写代码,该函数更新了进程列表,但这不起作用。
我能够显示一个值的静态数组,但单击按钮时不能动态显示。
任何帮助,将不胜感激。我对HTML,JavaScript和聚合当然还很陌生。
也许我错了,但看起来您在处理程序中有不正确的“ this” contex。在那里,我创建了代码片段,其目的是通过单击按钮来显示生成的列表,然后尝试一下。
<script src="https://cdnjs.cloudflare.com/ajax/libs/polymer/0.5.5/polymer.min.js"></script>
<polymer-element name="my-element" constructor="" attributes="">
<template>
<paper-button label="Submit" on-tap="{{onInvoke}}" affirmative autofocus>Populate list</paper-button>
<br/>
<paper-dropdown-menu id="Combo" label="Process">
<paper-dropdown class="dropdown">
<core-menu class="menu">
<template repeat="{{processlist}}">
<paper-item>{{}}</paper-item>
</template>
</core-menu>
</paper-dropdown>
</paper-dropdown-menu>
</template>
<script>
Polymer('my-element', {
onInvoke: function() {
this.processlist = ['a', 'b'];
}
});
</script>
</polymer-element>
<my-element></my-element>
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