in Vue.js, if you want to access a component instance using its name, you generally have to use the Vue component registry. Vue components are usually registered globally or locally in Vue instances or Vue components.

Given your example, if you have a component registered globally with a name, you can get the component constructor from Vue’s component registry using Vue.component. However, accessing the component directly through its name can be tricky since Vue doesn’t provide a direct API to fetch components by their names.

Here’s how you can get the component constructor using its name:

Globally Registered Components

If your component is globally registered, you can access it like this:

var topComponent = Vue.component("top");

Locally Registered Components

If the component is registered locally within a Vue instance or another component, accessing it by name becomes a bit more complicated since you can’t directly access the local component registry. However, if you have access to the instance where the component is registered, you can retrieve it like this:

var main = new Vue({
    el: "#main",
    data: {
        currentView: "top",
},
    components: {
        top: topComponent, // local registration
    },
});
// Accessing locally registered component
var topComponent = main.$options.components["top"];

Using Vue.extend: In your case, you are using Vue.extend to create a component. If you need to access this component outside the Vue instance or before registering it globally, you would need to keep a reference to it:

// Define the component

var topComponent = Vue.extend({
    template: "#top",
});
// Register globally
Vue.component("top", topComponent);
// Now you can retrieve it globally
var retrievedComponent = Vue.component("top");

Accessing Registered Components

If you have a local component registration and need to access it outside the Vue instance context, you might have to manage references manually. For example, store a reference in a global object or in a specific data structure that you can access later.

Here’s a full example with global registration:

By keeping these strategies in mind, you can manage and access your Vue components effectively based on your registration and usage patterns.

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