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I have a very basic Vue.js app that looks like this:

index.html (just the <body> for succinctness)

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

main.js

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

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

This gives me: 

Property or method "config" 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'm guessing it's because Vue is looking for it in the data store rather than window. Is there some way to signal that config is a global here, or a better way to do this entirely? I suppose I could pass the config object as a prop to my root Vue instance, but it seems like only ponents accept props. Thanks for any insights on this.

I have a very basic Vue.js app that looks like this:

index.html (just the <body> for succinctness)

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

main.js

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

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

This gives me: 

Property or method "config" 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'm guessing it's because Vue is looking for it in the data store rather than window. Is there some way to signal that config is a global here, or a better way to do this entirely? I suppose I could pass the config object as a prop to my root Vue instance, but it seems like only ponents accept props. Thanks for any insights on this.

  • javascript
  • vue.js
Share Improve this question asked Dec 13, 2016 at 17:21 bertdaybertday 11k15 gold badges67 silver badges98 bronze badges 1
  • 1 Why don't you just pass it to the Vue instance? data : { config : config }, – Luka Jacobowitz Commented Dec 13, 2016 at 17:30
Add a ment  | 

2 Answers 2

Reset to default 6

You can try to define your app as follows:

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

In the above definition, your this.config within the root ponent points to window.config - the global variable.

If you are just trying to pass the App Name in as a hard-coded string you can do something like this:

var nameMyApp = new Vue({
  el: '#root',
  data: { input: 'My App' },
  puted: {
    whosapp: function () {
      return this.input
    }
  }

})

With your html like this:

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

Which will pass the value of input to the whosapp div.

But, if you're looking for something more dynamic, this would be the way to go:

With the same html as above...

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

The initial value is set to My App, which is what will display if not changed through a function call on the method.

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

Here is where we define a method that, when called, passes in the parameter to update this.input.

  puted: {
    whosapp: function () {
      return this.input
    }
  }

})

nameMyApp.update("New Name");

And here is where we call the function, giving it the new parameter; making sure that the parameter is a string.

I hope this is what you're looking for.

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