使用带铁图标的轻触式纸质按钮使用不同的当前目标 [英] Different current target using on-tap on paper-button with iron-icons
问题描述
为什么使用paper-button和iron-icons和paper-button和iron-icons时，当前target的点按是不同的?
Why current target on-tap is different using paper-button with iron-icons and paper-button without iron-icons?
<dom-module id="button-tap">
<template>
<paper-button on-tap="_getData">without icon</paper-button>
<paper-button on-tap="_getData"><iron-icon="icons:thumb-up"></iron-icon> with icon</paper-button>
</template>
</dom>
如果不使用iron-icons(子元素)，则当前的target为paper-button.
The current target is paper-button if not using iron-icons (child element).
如果使用子元素，如何获取paper-button作为当前的target?
How can I get paper-button as current target if using a child element?
推荐答案
If you want to access the paper-button when its contents are clicked, use the Event.currentTarget (instead of target):
标识事件的当前目标，因为事件遍历DOM.它始终是指事件处理程序已附加到的元素，而
event.target则是标识事件发生在其上的元素.
Identifies the current target for the event, as the event traverses the DOM. It always refers to the element to which the event handler has been attached, as opposed to
event.targetwhich identifies the element on which the event occurred.
例如:
_onTap: function(e) {
console.log('currentTarget:', e.currentTarget);
}
HTMLImports.whenReady(() => {
Polymer({
is: 'x-foo',
_onTap: function(e) {
console.log('tap currentTarget:', e.currentTarget);
}
});
});
<head>
<base href="https://polygit.org/polymer+1.7.1/components/">
<script src="webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel="import" href="polymer/polymer.html">
<link rel="import" href="paper-button/paper-button.html">
<link rel="import" href="paper-icon-button/paper-icon-button.html">
<link rel="import" href="iron-icon/iron-icon.html">
<link rel="import" href="iron-icons/iron-icons.html">
<link rel="import" href="iron-icons/communication-icons.html">
</head>
<body>
<x-foo></x-foo>
<dom-module id="x-foo">
<template>
<div>paper-button:</div>
<paper-button on-tap="_onTap">
<iron-icon icon="communication:email"></iron-icon>
Email
</paper-button>
<div>
<div>paper-icon-button:</div>
<paper-icon-button icon="communication:email" on-tap="_onTap"></paper-icon-button>
</div>
</template>
</dom-module>
</body>
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