Incorporate a new class into the slot's scope

I'm developing a custom table feature that allows users to customize <td> elements using a slot. Here's the current setup:

<tbody>
  <tr v-for="(item, key) in items">
    <slot :item=item">
      <td v-for="(header, headerKey) in variableHeaders"
        :class="{
            veryImportantClass: condition > 5,
        }">
        {{item.text}}
      </td>
    </slot>
  </tr>
</tbody>

To utilize this slot, I have implemented the following code:

<my-component
  :headers="headers"
  :items="items">
  <template slot-scope="prop">
    <td :class="{ aClassAddedByAUser: true }" v-for="(header, headerKey) in headers" ...>
      {{ prop.item.text }} with some text
    </td>
  </template>
</my-component>

The challenge is that the inclusion of the mandatory veryImportantClass for each <td> created by users in the slot increases complexity.

Is there a simple way to automatically apply this class to all user-provided <td> elements within this scope?

Answer №1

To automatically add a class to all cells, you can utilize the mounted() life-cycle hook along with regular JavaScript functions. Below is an example of how you can unconditionally add a class to all cells. If you only want to add it to specific cells, you can modify the code accordingly.

mounted() {
    // wait for child components to render
    this.$nextTick(() => {
        this.$el.querySelectorAll("td")
            .forEach(td => {
                td.classList.add("veryImportantClass");
            });
        }
    }
}

If the content within the slot is going to change, you may also need to consider implementing something similar in the updated() hook.

Please keep in mind that this approach assumes the parent element is inserting <td> elements into the slot, which is not always guaranteed. However, if having invalid HTML is acceptable in your case, then this assumption should suffice.

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