我正在阅读事件指南和指南的开头，它说:
You can also add an event listener to any element in the this.$ collection using the syntax nodeId.eventName.
什么是
this.$收藏？
最佳答案
this.$包含从 Automatic node finding 创建的节点:
Polymer automatically builds a map of statically created instance nodes in its local DOM, to provide convenient access to frequently used nodes without the need to query for them manually. Any node specified in the element's template with an
idis stored on thethis.$hash byid.Note: Nodes created dynamically using data binding (including those in
dom-repeatanddom-iftemplates) are not added to thethis.$hash. The hash includes only statically created local DOM nodes (that is, the nodes defined in the element's outermost template).
<head>
<base href="https://polygit.org/polymer+1.6.0/components/">
<script src="webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel="import" href="polymer/polymer.html">
</head>
<body>
<x-foo></x-foo>
<dom-module id="x-foo">
<template>
<div id="div1">foo</div>
<div id="div2">bar</div>
<div id="div3">baz</div>
</template>
<script>
HTMLImports.whenReady(function() {
Polymer({
is: 'x-foo',
ready: function() {
console.log('div1', this.$.div1.textContent);
console.log('div2', this.$.div2.textContent);
console.log('div3', this.$.div3.textContent);
}
});
});
</script>
</dom-module>
</body>关于 polymer this.$ 集合，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39432359/