How can I retrieve the length of an array in vuejs?

This snippet includes a script tag

<script>
export default {
  data() {
    return {
      blogs: [],    
    };
  },
  created() {
    this.paginate_total = this.blogs.length / this.paginate; 
  },   
};
</script>

Displayed below is the response seen in my console:

{
   
    "blogs": [
   
        {
            "_id": "63243272c988e721db51de9c",
            
        },
        {
            "_id": "63243cb8a8189f8080411e65",        
        },
      
    ]
}

The error encountered in my console states:

Cannot read properties of undefined (reading 'length')

I need assistance figuring out what mistake I am making here

Answer №1

It is recommended to move this line of code to the mounted hook instead of created:

this.totalPages = this.articles.length / this.pageSize;

This adjustment is necessary because the articles array may not be available in the created hook, resulting in it being undefined.

Answer №2

During the mounted and created lifecycles, it is not possible to access the length of an object array directly. To work around this limitation, I utilized the watch property to monitor changes in the object length.

watch: {
   blogs(blogs) {
      this.paginate_total = blogs.length / this.paginate;
   }
}

Answer №3

When it comes to managing row counts, such as for table pagination, I prefer using a computed property like the one below:

computed: {
  calculateTotalRows() {
      return this.data.length;
  },
}

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