I am attempting to utilize the fetch API method to initialize the store's state, but for some reason, it is not functioning properly

Question

I am attempting to utilize the fetch API method to initialize the store's state, but for some reason, it is not functioning properly

Within my store.js file, I have a state called user_data, with its initial method set to fetch_user_data:

export default new Vuex.Store({
  state: {
    user_data: util.fetch_user_data('username')
    ...
  }

located in the util.js file:

util.fetch_user_data = function(username){
   Lml_http('get', Api_urls.productconfig_common.user_data(username), null, response => {

    return response.data  // data is obtained here, as shown in the debugger.
  }, error => {

  })
}

However, when attempting to use the user_data from the state, it returns as undefined.

EDIT-1

I aim to utilize the fetch_util method in the store.js file for data retrieval and commit to the state.

EDIT-2

The code snippet for the lml_http function is provided below:

var lml_http = function (method, url, params, success_cb, error_cb, multipart_formdata=undefined) {

  var format_to_form_data = function(data){

    let formData = new FormData()
    for (let item in data) {
      formData.append(item, data[item])
    }
    return formData
  }

  var lowercase_method = method.toLowerCase()

  var formated_params = params

  var header_config = null

  if (multipart_formdata) {
    header_config = {
      headers: {
        'Content-Type': 'multipart/form-data'
      }
    }

    formated_params = format_to_form_data(formated_params)
  }

  if(lowercase_method === "get") {

    formated_params = {params: formated_params}

    if (!header_config) {

      Axios.get(url, formated_params).then(response => {
        success_cb(response)
        return
      }).catch(response => {
        error_cb(response)
        return
      })
    } else {
      Axios.get(url, format_to_form_data(formated_params), header_config).then(response => {
        success_cb(response)
        return
      }).catch(response => {
        error_cb(response)
        return
      })

    }

    return
  }
  else {


    if(!header_config) {

      Axios[method](url, formated_params).then(response => {
        success_cb(response)
      }).catch(response => {
        error_cb(response)
      })
      return
    }else {
      Axios[method](url, formated_params, header_config).then(response => {
        success_cb(response)
      }).catch( response => {
        error_cb(response)
      })
      return
    }

  }

}

javascript vue.js vuex

Answer 1

Answer №1

To get the user data, you can create an action like this:

export default new Vuex.Store({
  state: {
    user_data: null
  },
  mutations: {
    setUserData(state, data) {
      state.user_data = data;
    }
  },
  actions: {
    fetchUserData({ commit }, username) {
      Lml_http(
        "get",
        Api_urls.productconfig_common.user_data(username),
        null,
        response => {
          commit("setUserData", response.data);
        },
        error => {}
      );
    }
  }
});

Next, you need to dispatch this action in the created() hook of the root Vue instance.

//main.js

new Vue({
  el: "#app",
  store,
  render: h => h(App),
  created() {
    this.$store.dispatch("fetchUserData", "username");
  }
});

`

Edit:

By default, Axios returns a Promise. Here's how you should handle Axios calls within lml_http:

var lml_http = function(
  method,
  url,
  params,
  success_cb,
  error_cb,
  multipart_formdata = undefined
) {
  // Function to format data to FormData
  var format_to_form_data = function(data) {
    let formData = new FormData();
    for (let item in data) {
      formData.append(item, data[item]);
    }
    return formData;
  };

  var lowercase_method = method.toLowerCase();

  var formated_params = params;

  var header_config = null;

  if (multipart_formdata) {
    header_config = {
      headers: {
        "Content-Type": "multipart/form-data"
      }
    };

    formated_params = format_to_form_data(formated_params);
  }

  if (lowercase_method === "get") {
    formated_params = { params: formated_params };

    if (!header_config) {
      return Axios.get(url, formated_params)
        .then(response => {
          success_cb(response);
        })
        .catch(response => {
          error_cb(response);
        });
    } else {
      return Axios.get(url, format_to_form_data(formated_params), header_config)
        .then(response => {
          success_cb(response);
        })
        .catch(response => {
          error_cb(response);
        });
    }
  } else {
    if (!header_config) {
      return Axios[method](url, formated_params)
        .then(response => {
          success_cb(response);
        })
        .catch(response => {
          error_cb(response);
        });
    } else {
      return Axios[method](url, formated_params, header_config)
        .then(response => {
          success_cb(response);
        })
        .catch(response => {
          error_cb(response);
        });
    }
  }
};

Don't forget to add a return statement in utils.js as shown below:

util.fetch_user_data = function(username){
   return Lml_http('get', Api_urls.productconfig_common.user_data(username), null, response => {

    return response.data  // Fetch and return the data
  }, error => {

  })
}

In your action fetchUserData, update it to:

fetchUserData({ commit }) {
    util.fetch_user_data('username').then((
      commit("setUserData", response.data);
    });
}

In main.js, simply dispatch the action without providing any payload:

//main.js

new Vue({
  el: "#app",
  store,
  render: h => h(App),
  created() {
    this.$store.dispatch("fetchUserData", "username");
  }
});

Answer 2

To get the user data, you can create an action like this:

export default new Vuex.Store({
  state: {
    user_data: null
  },
  mutations: {
    setUserData(state, data) {
      state.user_data = data;
    }
  },
  actions: {
    fetchUserData({ commit }, username) {
      Lml_http(
        "get",
        Api_urls.productconfig_common.user_data(username),
        null,
        response => {
          commit("setUserData", response.data);
        },
        error => {}
      );
    }
  }
});

Next, you need to dispatch this action in the created() hook of the root Vue instance.

//main.js

new Vue({
  el: "#app",
  store,
  render: h => h(App),
  created() {
    this.$store.dispatch("fetchUserData", "username");
  }
});

`

Edit:

By default, Axios returns a Promise. Here's how you should handle Axios calls within lml_http:

var lml_http = function(
  method,
  url,
  params,
  success_cb,
  error_cb,
  multipart_formdata = undefined
) {
  // Function to format data to FormData
  var format_to_form_data = function(data) {
    let formData = new FormData();
    for (let item in data) {
      formData.append(item, data[item]);
    }
    return formData;
  };

  var lowercase_method = method.toLowerCase();

  var formated_params = params;

  var header_config = null;

  if (multipart_formdata) {
    header_config = {
      headers: {
        "Content-Type": "multipart/form-data"
      }
    };

    formated_params = format_to_form_data(formated_params);
  }

  if (lowercase_method === "get") {
    formated_params = { params: formated_params };

    if (!header_config) {
      return Axios.get(url, formated_params)
        .then(response => {
          success_cb(response);
        })
        .catch(response => {
          error_cb(response);
        });
    } else {
      return Axios.get(url, format_to_form_data(formated_params), header_config)
        .then(response => {
          success_cb(response);
        })
        .catch(response => {
          error_cb(response);
        });
    }
  } else {
    if (!header_config) {
      return Axios[method](url, formated_params)
        .then(response => {
          success_cb(response);
        })
        .catch(response => {
          error_cb(response);
        });
    } else {
      return Axios[method](url, formated_params, header_config)
        .then(response => {
          success_cb(response);
        })
        .catch(response => {
          error_cb(response);
        });
    }
  }
};

Don't forget to add a return statement in utils.js as shown below:

util.fetch_user_data = function(username){
   return Lml_http('get', Api_urls.productconfig_common.user_data(username), null, response => {

    return response.data  // Fetch and return the data
  }, error => {

  })
}

In your action fetchUserData, update it to:

fetchUserData({ commit }) {
    util.fetch_user_data('username').then((
      commit("setUserData", response.data);
    });
}

In main.js, simply dispatch the action without providing any payload:

//main.js

new Vue({
  el: "#app",
  store,
  render: h => h(App),
  created() {
    this.$store.dispatch("fetchUserData", "username");
  }
});

Answer 3

Answer №2

Due to the asynchronous nature of the fetch api, it will generate a promise instead of directly providing the response data. One potential approach could be:

const dataStore = new Vuex.Store({
  state: {
  userData: null,
  ...
};

util.fetchUserData('username')
  .then(user => dataStore.userData = user);

export default dataStore;

Answer 4

Due to the asynchronous nature of the fetch api, it will generate a promise instead of directly providing the response data. One potential approach could be:

const dataStore = new Vuex.Store({
  state: {
  userData: null,
  ...
};

util.fetchUserData('username')
  .then(user => dataStore.userData = user);

export default dataStore;

I am attempting to utilize the fetch API method to initialize the store's state, but for some reason, it is not functioning properly

Answer №1

Edit:

Answer №2

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