The combination of Vue.js and SVG modules resulting in misaligned nodes

Imagine having two vue components:

parentComponent.vue

<template>
  <svg>
    <child-component v-for="i in ['a', 'b']" :key="i"/>
  </svg>
</template>
...

childComponent.vue

<template>
  <g>
    //...some valid svg content
  </g>
</template>
...

Although it functions well, there is a downside. In development mode, I receive a warning about mismatched nodes - looks like Vue has an issue with using svg elements. It might interfere during re-rendering. Any solutions to this?


Edit

After some research, it appears the problem could be related to how the canvas property is updated. Unable to replicate it in CodePen (perhaps due to different versions of Vue and logging levels), here's a live example: https://github.com/msdsk/so_svg_example

Answer №1

The issue in your case stems from the use of Math.random() within the pages/index.vue file (and not related to SVG). This results in the server-side rendered page not aligning with the virtual DOM created on the client-side, which triggers the warning message during hydration.

As mentioned in the Vue SSR documentation:

Hydration involves the process on the client-side where Vue takes control of the static HTML sent by the server and transforms it into a dynamic DOM that is able to react to changes in client-side data.

...

During development mode, Vue verifies that the client-generated virtual DOM structure matches the server-rendered DOM form. If there is a discrepancy, Vue will stop the hydration process, discard the current DOM, and start rendering from scratch.

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