Utilizing Vue.js: accessing a global value within a template string

I am working on a simple Vue.js application with the following structure:

index.html (only the <body> for brevity)

<div id="root"></div>

main.js

var settings = {
  title: 'My App',
}

new Vue({
  el: '#root',
  template: '<div>{{ settings.title }}</div>',
})

When I run this code, I encounter the following error:

Property or method "settings" is not defined on the instance but referenced during render. Make sure to declare reactive data properties in the data option. 
(found in root instance)

I believe the issue arises because Vue expects the variable to be defined in the data store instead of the global scope. Is there a way to declare settings as a global variable in this context, or perhaps a more effective approach to achieve the desired outcome? I considered passing the config object as a prop to the root Vue instance, but it seems that only components support props. I welcome any insights or suggestions on how to address this dilemma. Thank you.

Answer №1

To define your app, you can follow these steps:

const app = new Vue({
  el: '#app',
  template: '<div>{{ data.title }}</div>',
  data: function() {
    return {
      data: window.data
    }
  }
})

In the provided code, the this.data in the main component is referencing the global variable window.data.

Answer №2

If you want to pass the App Name as a hard-coded string, you can achieve it in the following way:

var myApp = new Vue({
  el: '#root',
  data: { input: 'My App' },
  computed: {
    appName: function () {
      return this.input
    }
  }

})

Your HTML should look like this:

<div id="root">
  <div v-html="appName"></div>
</div>

This snippet will display the value of input in the appName div.

If you prefer a more dynamic approach, you can follow this method:

Using the same HTML structure as before...

var myApp = new Vue({
  el: '#root',
  data: { input: 'My App' },

The initial value is set to My App, which will be displayed unless changed through a function call on the method.

    methods: {
    update: function(name) {
        this.input = name;
    }
  },

Here, we define a method that updates input when called with a parameter.

  computed: {
    appName: function () {
      return this.input
    }
  }

})

myApp.update("New Name");

Finally, calling the function with a new parameter will update the displayed name accordingly.

I hope this solution meets your requirements!

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