我正在尝试使用class而不是id
实现多次铁崩溃问题中提到的解决方案 - Polymer Multiple Iron-Collapse有效,但我有更多的铁崩溃,我不想为相同的功能创建重复的代码
我尝试使用类而不是id
选择相应元素的不同选项codepen- https://codepen.io/nagasai/pen/YxyqmE
HTML:
<head>
<base href="https://polygit.org/polymer+v2.0.0/shadycss+webcomponents+1.0.0/components/">
<link rel="import" href="polymer/polymer.html">
<link rel="import" href="iron-collapse/iron-collapse.html">
<link rel="import" href="paper-input/paper-input.html">
</head>
<body>
<x-foo attr="{{text}}"></x-foo>
<dom-module id="x-foo">
<template id="collapse1">
<button on-click="toggle">toggle collapse</button>
<iron-collapse class="collapse">
<div>Enter text collapse1</div>
</iron-collapse>
<button on-click="toggle">toggle collapse</button>
<iron-collapse class="collapse">
<div>Enter text collapse2</div>
</iron-collapse>
<button on-click="toggle">toggle collapse</button>
<iron-collapse class="collapse">
<div>Enter text collapse2</div>
</iron-collapse>
</template>
</dom-module>
</body>
JS:
class XFoo extends Polymer.Element {
static get is() { return 'x-foo'; }
static get properties() {
return {};
}
toggle() {
console.log(this);
this.$.querySelector('.collapse').toggle();
}
}
customElements.define(XFoo.is, XFoo);
答案 0 :(得分:0)
我建议你使用自定义属性。以下是工作解决方案:https://codepen.io/Sahero/pen/VzeWNd
HTML:
<head>
<base href="https://polygit.org/polymer+v2.0.0/shadycss+webcomponents+1.0.0/components/">
<link rel="import" href="polymer/polymer.html">
<link rel="import" href="iron-collapse/iron-collapse.html">
<link rel="import" href="paper-input/paper-input.html">
</head>
<body>
<x-foo attr="{{text}}"></x-foo>
<dom-module id="x-foo">
<template>
<button on-click="toggle" my-attribute="collapse1">toggle
collapse</button>
<iron-collapse id="collapse1" class="collapse">
<div>Enter text collapse1</div>
</iron-collapse>
<button on-click="toggle" my-attribute="collapse2">toggle
collapse</button>
<iron-collapse id="collapse2" class="collapse">
<div>Enter text collapse2</div>
</iron-collapse>
<button on-click="toggle" my-attribute="collapse3">toggle
collapse</button>
<iron-collapse id="collapse3" class="collapse">
<div>Enter text collapse3</div>
</iron-collapse>
</template>
</dom-module>
</body>
JS:
class XFoo extends Polymer.Element {
static get is() { return 'x-foo'; }
static get properties() {
return {};
}
toggle(e) {
//console.log(this);
var id = e.target.getAttribute('my-attribute');
console.log(id);
this.shadowRoot.querySelector('#'+id).toggle();
//this.shadowRoot.querySelector('.collapse').toggle();
}
}
customElements.define(XFoo.is, XFoo);
答案 1 :(得分:0)
为<dom-repeat>
项目实现此目的的一种方法是使用事件的currentTarget
,以便您可以选择调用方法的元素。我有一个示例,其中有多个列表项(paper-listbox
),带有一个右箭头图标,当iron-collapse
项展开时,该图标变为向下箭头。在我的示例中,不需要任何课程,但您可以轻松拥有e.currentTarget.querySelector('.theClass')
示例:
<dom-repeat items={{list}}>
<template>
<paper-listbox on-click="toggle">
<iron-icon id="icon" icon="icons:chevron-right"></iron-icon>
<paper-item>{{item.title}}</paper-item>
<iron-collapse class="collapse">
<p>Content here . . . </p>
</iron-collapse>
</paper-listbox>
</template>
</dom-repeat>
及其下的JS:
toggle(e) {
// currentTarget selects the paper-listbox where the toggle method occurred.
var collapseArea = e.currentTarget.querySelector('iron-collapse');
var theIcon = e.currentTarget.querySelector('iron-icon');
collapseArea.toggle();
// toggle the icon for list item from right arrow to downward arrow
(theIcon.getAttribute('icon') === 'icons:chevron-right') ? theIcon.setAttribute('icon', 'icons:expand-more') : theIcon.setAttribute('icon', 'icons:chevron-right');
}