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How to compute styles on or using vue.js?

Asked By: Anonymous

I am using vuejs style bindings to render changes dynamically as the styles are computed.

This works great for everything within the scope of my Vue instance but how can I compute styles for body or html tags?
This used to be possible when you could bind the vue instance to but vue no longer lets you do it.

I want to dynamically update the background color of using my computed variables in vue.

edit: added code snippet to demonstrate

_x000D_

_x000D_

var app = new Vue({_x000D_
  el: '#app',_x000D_
  data: {_x000D_
    color: '#666666'_x000D_
  },_x000D_
  computed: {_x000D_
    backgroundColor: function() {_x000D_
      return {_x000D_
        'background-color': this.color_x000D_
      }_x000D_
    }_x000D_
  },_x000D_
  methods: {_x000D_
    toggleBackground: function() {_x000D_
      if(this.color=='#666666'){_x000D_
        this.color = '#BDBDBD'_x000D_
      } else {_x000D_
        this.color = '#666666'_x000D_
      }_x000D_
    }_x000D_
  }_x000D_
})

_x000D_

<a href="https://vuejs.org/js/vue.min.js">https://vuejs.org/js/vue.min.js</a>_x000D_
<html>_x000D_
  <body>_x000D_
    <div id="app" :style="backgroundColor">_x000D_
      <div>_x000D_
        lots of content..._x000D_
      </div>_x000D_
      <button @click="toggleBackground"> Click to toggle </button>_x000D_
    </div>_x000D_
  </body>_x000D_
</html>

_x000D_

_x000D_

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Solution

Answered By: Anonymous

If you really need to style body itself, you’ll need to do it with plain JavaScript in a watcher. A simple example is below.

You should (not something I’ve tried, but I’m hypothesizing) be able to defeat overscrolling effects by making body and your outer container non-scrolling. Put a scrollable container inside that. When it overscrolls, it will show your outer container, right?

The reasons for not binding to body are here (for React, but applies to Vue).

What’s the problem with ? Everybody updates it! Some people have
non-[Vue] code that attaches modals to it. Google Font Loader will
happily put elements into body for a fraction of second, and
your app will break horribly and inexplicably if it tries to update
something on the top level during that time. Do you really know what
all your third party scripts are doing? What about ads or that social
network SDK?

_x000D_

_x000D_

new Vue({_x000D_
  el: '#app',_x000D_
  data: {_x000D_
    isRed: false_x000D_
  },_x000D_
  watch: {_x000D_
    isRed() {_x000D_
      document.querySelector('body').style.backgroundColor = this.isRed ? 'red' : null;_x000D_
    }_x000D_
  }_x000D_
});

_x000D_

#app {_x000D_
  background-color: white;_x000D_
  margin: 3rem;_x000D_
}

_x000D_

<a href="//cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.min.js">//cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.min.js</a>_x000D_
<div id="app">_x000D_
  <input type="checkbox" v-model="isRed">_x000D_
</div>

_x000D_

_x000D_

x000D

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