What is the Vue.js alternative to using appendChild for dynamically inserting new elements or components?

When working with Vue.js, I have successfully created a var app = new Vue({...}); and defined a component Vue.component('mycomponent', .... I am able to use this component by directly adding

<mycomponent></mycomponent>
in my HTML. However, what I am looking to achieve is the ability to dynamically add these components when needed, such as after a button click or some other event. Typically in raw JavaScript, I would use document.createElement... when the event occurs and then use el.appendChild... to add it to the HTML. How can I achieve the same functionality using Vue.js?

It's important to note that I am not utilizing Node.js for this project. I have included

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
in the <head> of my single HTML page.

Answer №1

Typically, when working with Vue.js, the recommended approach involves utilizing directives like v-if, v-for, or <component>, depending on the specific task you are trying to accomplish:

  • Implement v-if to conditionally display a component/element based on a set condition.
  • Utilize v-for to render a list of components/elements.
  • Use <component> for rendering a dynamic component/element.

To address the scenario you mentioned in your inquiry, you can define a boolean data property named visible as follows:

data() {
  return {
    visible: false
  }
}

You can then use v-if to control the visibility of a component within the template:

<mycomponent v-if="visible"></mycomponent>

In cases where you are unsure of the specific component to display, you can include all possibilities in the template and show the desired one based on a condition:

<comp1 v-if="comp1Visible"></comp1>
<comp2 v-if="comp2Visible"></comp2>
<comp3 v-if="comp3Visible"></comp3>

Alternatively, you can utilize <component> alongside another data property (comp) which can be set to the component name you wish to display:

<component v-if="visible" :is="comp"></component>

The approach of using document.createElement followed by el.appendChild is not supported in Vue. Vue follows a strict rendering mechanism that you must adhere to; dynamically creating and appending components to the DOM at random is not feasible. While technically you can do comp = new Vue() similar to document.createElement and then el.appendChild(comp.$el), this would result in an independent Vue instance that needs to be manually managed without straightforward data transfer capabilities.

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