Tips on modifying a Vue app's property externallyHere are some techniques on how

I am curious about changing the property of a vue app from an external source. I want to create a new vue app named 'app' and set 'app.propertyName' to 'someValue'. However, my attempt below did not yield the desired outcome. How can this be accomplished?

<!DOCTYPE html>
<html>
<head>
  <title>Changing Vue App Property</title>
  <style>
    #app {
      display: inline-block;
      padding: 10px;
      font-size: x-large;
      background-color: lightgreen;
    }
  </style>
</head>

<body>
  <h1>'template' Example</h1>

  <p>All HTML code inside the div tag with id="app" has been moved within the 'template' configuration option, enclosed in backtick quotes.</p>

  <div id="app"></div>

  <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>

  <script>
    const app = Vue.createApp({
      template: `<h1>{{ message }}</h1>
    <p>This is a second line of HTML code, wrapped in backticks</p>`,
      data() {
        return {
          message: "Hello World!"
        }
      }
    })

    app.mount('#app');
    app.message = "My name is Florian"; //This line does not work as intended
  </script>
</body>
</html>
            

Answer №1

To access or modify the message, simply use $data:

 app.$data.message = "My name is Thomas"; // Utilize the $data to interact with reactive data object

Answer №2

In Vue 3, you have the ability to manipulate the app's instance by utilizing the _instance property:

app._instance.data.message = "Your name is Florence";

Check out this code snippet below:

const app = Vue.createApp({
  template: `<h1>{{ message }}</h1>`,
  data() {
    return {
      message: "Hello World!"
    }
  }
})

app.mount('#app');
app._instance.data.message = "Your name is Florence";
<div id="app"></div>

<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>

Answer №3

The issue lies in accessing the application instance instead of the root component instance.

To correctly handle this situation, the code should be:

const vm = app.mount('#app');
vm.message = "My name is Florian";

It's considered sloppy practice to modify private data externally as it violates encapsulation. If modifying internal data is necessary, it is advisable to define a public API for the component:

const app = Vue.createApp({
  ...
  expose: ['setMessage'],
  methods: {
    setMessage(message) {
      this.message = message;
    }
  }
});

const vm = app.mount('#app');
vm.setMessage("My name is Florian");

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