What is the maximum level of referencing allowed in v-if conditions?

I'm encountering an issue with some markup I have:

<div class="form-group" v-if="model.owner.enabled">

The model object in the scope is structured like this:

{
   ...
   owner: {
      enabled: true
      ...
   }
   ...
}

However, Vue is throwing an error:

TypeError: Cannot read property 'enabled' of undefined

Can anyone help me pinpoint the problem? Could it be because the lookup is only searching for properties on the first level of the model object?

Interestingly, when I modify the markup to:

<div class="form-group" v-if="model.owner">

It works without any issues and the element is displayed. It seems that the model.owner object being present is enough to satisfy the condition.

Thank you!

javascriptvue.js

Answer №1

There are no limits set in stone. My suspicion is that the issue at hand arises from the asynchronous population of your model. In such a scenario, when Vue initially renders, model.owner may be undefined and trying to access model.owner.enabled will lead to the error you mentioned.

The reason model.owner likely works is because model is defined while owner is not during the initial rendering. Subsequently, when the model is populated, owner ceases to be undefined.

To address this, you could use a guard statement like so:

<div class="form-group" v-if="model.owner && model.owner.enabled">

For further reference, here's an illustrative example.

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