action.js

export function loadCategories({dispatch, state},keyword) {
    dispatch('SHOW_LOADING')

    let start = (state.category.page * state.itens_per_page) - (state.itens_per_page - 1);

    let keywordString=""
    if (keyword!=null){
      keywordString=`&q=${keyword}`
    }

    this.$http.get(`${URL}/categories?start=${start}&limit=${state.itens_per_page}${keywordString}`).then(
      response => {
        dispatch("SET_CATEGORIES", response.json())
        dispatch('SET_TOTAL_CATEGORIES', response.headers['x-total-count']);
      },
      error => {
        dispatch("SHOW_ERROR", error.body)
      }
      ).finally(function () {
        dispatch("HIDE_LOADING")
      })
    }