如何设置Web组件中最后一个插入的元素的样式

问题描述

我有一个Web组件，它的模板看起来像这样...

I have a web component that has a template which looks like this...

<template>
  <div class="jrg-app-header">
    <slot name="jrg-app-header-1"></slot>
    <slot name="jrg-app-header-2"></slot>
    <slot name="jrg-app-header-3"></slot>
  </div>
</template>

我基本上是在尝试将最后一个广告位的内容设置为样式为 flex:1; .是否有CSS查询可以做到这一点?我尝试了一些清单

I am basically trying to set the contents of the last slot to have flex:1; in style. Is there a CSS query that will do this? I tried something list

::slotted(*):last-child{
  flex:1;
}

但是它没有用.如何设置最后一个插槽对象的样式?

But it did not work. How do I style the last slotted object?

推荐答案

有关:: slotted的详细答案，请参见:

For long answer on ::slotted see: ::slotted CSS selector for nested children in shadowDOM slot

从文档中: https://developer.mozilla.org/en-US/docs/Web/CSS/:: slotted

伪选择器放在方括号内: :: slotted(*:last-child)

The pseudo selector goes inside the brackets: ::slotted(*:last-child)

注意::slotted(...)使用 简单 选择器( https://vegibit.com/css-selectors-tutorial/)

  customElements.define('my-table', class extends HTMLElement {
    constructor() {
      let template = document.cloneNode(document.querySelector('#t1').content, true);
      super()
       .attachShadow({ mode: 'open' })  
       .append(template);
    }
  })

<template id="t1">
  <style>
    :host {
      display: flex;
      padding:1em;
    }
    ::slotted(*:first-child) {
      background: green;
    }
    ::slotted(*:last-child) {
      background: yellow;
      flex:1;
    }
    ::slotted(*:first-of-type) {
      border: 2px solid red;
    }
    ::slotted(*:last-of-type) {
      border: 2px dashed red;
    }
  </style>
  <slot name="column"></slot>
</template>

<my-table>
  <div slot="column">Alpha</div><div slot="column">Bravo</div><div slot="column">Charlie</div>
</my-table>
<my-table>
  <div slot="column">Delta</div><div slot="column">Echo</div>
</my-table>

JSFiddle游乐场: https://jsfiddle.net/CustomElementsExamples/whtjen3k/

JSFiddle playground: https://jsfiddle.net/CustomElementsExamples/whtjen3k/

可通过StackOverflow搜索找到更多与SLOT相关的答案:

More SLOT related answers can be found with StackOverflow Search: Custom Elements SLOTs

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