call function inside data() have tried to fetch data with axios like the documentation but getting an error

[maikenmadsen1992]

Thank you so much for this great library :-)

I'm trying to fetching some data for my search tree and i'm not able to get the data directly from axios or to call a function because it can't find this.

export default {
  name: 'SideNavMenu',
    data () {
      return {
         searchValue: '',
         treeData: this.getData(),
         treeOptions: {

              fetchData(node) {
                this.onNodeSelected(node)

         }
      },
  }
 },

In the data() I have treeOptions where I want to call a function called onNodeSelected. The error message is:

"TypeError: this.onNodeSelected is not a function"

can anybody help?

I have tried:

 fetchData(node) {
    return axios.get('/user', {
       params: {
        ID: node.id
      }
     })
    }

But not able to 'get'.