Call function in function event (onChange), from Select created in Leaflet and Vue.js

I am making a app in Vue.js and Leaflet. In this app, I have a Select in leaflet created with L.DomUtil

  this.select = L.DomUtil.create('select','leaflet-countryselect',this.div);

I do not find the way for put 'v-on:change' in this 'Select', so, I have to call a event function, inside to a Function Method in Vue.js.

 methods: {
   firstFunction{
   },
   secondFunction() {
      this.select.on('change', function(e){
           this.firstFunction()
      }
   }
 }

But it not working, the error is "this.firstFunction() is not a function"

I tried to put

   .../
     var _self = this
     _self.firstFunction()
    ../

But not working, anyway.

How can I do it? Thanks.

Solution 1:

You should use arrow function ()=>{...} to get access to the component instance this as follows :

      secondFunction() {
          this.select.on('change', (e)=>{
            this.firstFunction()
              }
        }