如何更新 Vue.JS 中的插槽

How to update a slot in Vue.JS(如何更新 Vue.JS 中的插槽)

问题描述

我在下面简化了一个 Vue 组件.

I have a Vue component simplified below.

这是模板

<template>
    <slot></slot>
</template>

插槽可能包含 HTML，这就是为什么我决定使用插槽而不是简单绑定到的道具的原因.我想保持这种状态.

The slot may contain HTML, which is why I decided to use a slot rather than a prop which I would simply bind to. I'd like to keep it that way.

我有一个从服务器获取新 HTML 的方法.我想使用这个新的 HTML 来更新插槽.我不确定插槽是否是反应式的以及如何实现这一点.

I have a method that gets new HTML from the server. I'd like to use this new HTML to update the slot. I'm not sure if slots are reactive and how I can accomplish this.

我可以使用 this.$slots.default[0] 查看默认插槽，但我不知道如何使用 HTML 内容字符串对其进行更新.简单地将字符串分配给元素显然是不正确的，对于 .innerHtml 不起作用，因为它不是可用的函数，对于 .text 不起作用.我假设即使文本元素存在于 slot 对象上，元素属性也优先.

I can view the default slot using this.$slots.default[0], but I don't know how to update it with a string of HTML content. Simply assigning the string to the element is obviously incorrect, to .innerHtml does not work because it isn't an available function, and to .text doesn't work. I assume that even though the text element exists on the slot object, the element properties take precedence.

根据评论中的建议，我已将其与计算机属性一起尝试过.

Per suggestion in comments, I've tried this along with a computer property.

<span v-html="messageContent"><slot></slot></span>

但现在的问题是它覆盖了传递给我的插槽.

But now the problem is that it overwrites the slot passed to me.

如何在 Vue.JS 中使用新的 HTML 响应式更新插槽?

推荐答案

我认为您的问题来自对 <slot> 在 VueJS 中的固有工作方式的误解.插槽用于将内容从消费父组件交织到子组件中.将其视为 v-bind:prop 的 HTML 等价物.当您在组件上使用 v-bind:prop 时，您实际上是在将数据传递给子组件.这与插槽相同.

I think your issue comes from a misunderstanding of how <slot> inherently works in VueJS. Slots are used to interweave content from a consuming parent component into a child component. See it as a HTML equivalent of v-bind:prop. When you use v-bind:prop on a component, you are effectively passing data into a child component. This is the same as slots.

没有任何具体的例子或代码，这个答案充其量只是猜测.我假设你的父组件是一个 VueJS 应用程序本身，而子组件是包含 <slot> 元素的那个.

Without any concrete example or code from your end, this answer is at best just guess-work. I assume that your parent component is a VueJS app itself, and the child component is the one that holds the <slot> element.

<!-- Parent template -->
<div id="app">
    <custom-component>
        <!-- content here -->   
    </custom-component>
</div>

<!-- Custom component template -->
<template>
    <slot></slot>
</template>

在这种情况下，应用程序有一个默认的基本状态，它将静态 HTML 传递给子组件:

In this case, the app has a default ground state where it passes static HTML to the child component:

<!-- Parent template -->
<div id="app">
    <custom-component>
        <!-- Markup to be interweaved into custom component -->
        <p>Lorem ipsum dolor sit amet.</p>
    </custom-component>
</div>

<!-- Custom component template -->
<template>
    <slot></slot>
</template>

然后，当触发事件时，您想用新的传入标记替换该基态标记.这可以通过将传入的 HTML 存储在 data 属性中，并简单地使用 v-html 有条件地呈现它来完成.假设我们要将传入的标记存储在应用程序的 vm.$data.customHTML 中:

Then, when an event is fired, you want to replace that ground-state markup with new incoming markup. This can be done by storing the incoming HTML in the data attribute, and simply using v-html to conditionally render it. Let's say we want to store the incoming markup in app's vm.$data.customHTML:

data: {
    customHTML: null
}

那么您的模板将如下所示:

Then your template will look like this:

<!-- Parent template -->
<div id="app">
    <custom-component>
        <div v-if="customHTML" v-html="customHTML"></div>
        <div v-else>
            <p>Lorem ipsum dolor sit amet.</p>
        </div>
    </custom-component>
</div>

<!-- Custom component template -->
<template>
    <slot></slot>
</template>

请注意，与您尝试过的代码相比，不同之处在于:

Note that in contrast to the code you have tried, the differences are that:

• 父组件(即消费组件)负责规定将哪种标记传递给子组件
• 子组件就像 dumb 一样:它只是接收标记并将其呈现在 <slot> 元素中

• It is the parent component (i.e. the consuming component) that is responsible for dictating what kind of markup to pass to the child
• The child component is as dumb as it gets: it simply receives markup and renders it in the <slot> element

请参阅下面的概念验证:

See proof-of-concept below:

var customComponent = Vue.component('custom-component', {
  template: '#custom-component-template'
});

new Vue({
  el: '#app',
  data: {
    customHTML: null
  },
  components: {
    customComponent: customComponent
  },
  methods: {
    updateSlot: function() {
      this.customHTML = '<p>Foo bar baz</p>';
    }
  }
});

.custom-component {
  background-color: yellow;
  border: 1px solid #000;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.16/vue.min.js"></script>

<div id="app">
  <h1>I am the app</h1>
  <button type="button" @click="updateSlot">Click me to update slot content</button>
  <custom-component>
    <div v-if="customHTML" v-html="customHTML">
    </div>
    <div v-else>
      <p>Lorem ipsum dolor sit amet.</p>
    </div>
  </custom-component>
</div>

<!-- custom-component template -->
<script type="text/template" id="custom-component-template">
  <div class="custom-component">
    <h2>I am a custom component</h2>
    <!-- slot receives markup set in <custom-component> -->
    <slot></slot>
  </div>
</script>

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