Steer clear of the null value in the subcomponent

There's a sub-component that I'm using for a page:

<template>
  <div class="ll-page-wrapper">
    <div class="ll-page-div">
      <Page :total="data_count" :current="cur_page" @on-change="changePage"></Page>
    </div>
  </div>
</template>

<script>
  export default {
    props: {
      data_count: {
        type: Number,
        required: true
      }
    }
  }
</script>

Within the parent component, I'm using it like this:

<ll-page :data_count="os_type_data.count" 
         @change_page_for_parent="os_type_change_page"></ll-page>

Sometimes the os_type_data.count ends up being undefined since it hasn't been fetched yet.

To prevent this issue without altering the parent component code and impacting the user experience, I'm looking to resolve it within the sub-component. Can anyone suggest a solution?

javascriptvue.jsvue-component

Answer №1

The props section includes a validator parameter:

For example:

Vue.component('example', {
  props: {
    ...
    propF: {
      validator: function (value) {
        return value > 10
      }
    }
  }
})

To modify the props of your sub-component, you can do the following:

props: {
  data_count: {
    type: [Number, undefined],
    required: true,
    validator:function (value) {
      if (!value) {
        return 1
      }
    }
  }
},

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