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up vote 1 down vote favorite

I'd like to learn what is the best way to conditionally render an HTML attribute in Vue.js. For example, add data-toggle="tooltip" if there is a tooltip message for current instance.

The code I have now:

<span
  :data-toggle="!!col.col_spec.tooltip ? 'tooltip' : ''"
  :title="col.col_spec.tooltip"
>
  {{ col.col_spec.title }}
</span>

Though, I don't like the 2nd line much… Even if I use computed property here, I'd prefer not to have data-toggle attribute at all, when there is no tooltip to display.

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1  
If you don't want the attribute to exist at all when there is no tooltip, then I would probably not do this in the template, but rather in mounted() or something like that. – Bert Evans Jan 16 at 17:28
up vote 2 down vote

Something like:

<span ref="column">
  {{ col.col_spec.title }}
</span>

And in Vue:

mounted(){
    if (this.col.col_spec.tooltip){
      this.$refs.column.setAttribute("data-toggle", this.col.col_spec.tooltip);
    }
}
share|improve this answer
up vote 1 down vote

Here's another working but not so elegant solution: 

<span v-if="!!col.col_spec.tooltip" data-toggle="tooltip" >
    {{ col.col_spec.title }}
</span>
<span v-else >
    {{ col.col_spec.title }}
</span>
share|improve this answer

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