Exploring the Scope of HTTP Requests

Is it possible to have the variable `pass_or_fail` assigned within the `.then` clause and have that assignment reflected outside of the `.then` clause?

this.$http.post('http://localhost:3000/signup?username='+this.username+'&password='+this.password+'&password2='+this.password2)
  //make get request to API with what USER entered into the search bar in the query string
    .then(response => {
        if(response.body == "success"){

          this.pass_or_fail = response.body;

        }
    }

)

   console.log(this.pass_or_fail);
    if(this.pass_or_fail == "success"){
    this.$router.push({name:'landing-page'});
    }

  //set sources variable to our response


}

However, when I try to log `this.pass_or_fail` outside of the `.then` clause, the variable has not been assigned the value of `response.body`. Any thoughts on why the change inside the `.then` clause is not being reflected outside of it?

Answer №1

When making an asynchronous request, it's important to note that the function passed to the `then` method may not have executed yet when you log `this.pass_or_fail`.

To ensure that your code executes properly dependent on the result of the post request, place it inside the function being passed to `then()`:

this.$http.post('yoururl')
  .then((response) => {
    if (response.body == "success") {
      this.pass_or_fail = response.body;

      console.log(this.pass_or_fail);

      this.$router.push({ name: 'landing-page' });
    }
  });

Answer №2

When you try to access the value of this.pass_or_fail synchronously before it has been obtained, it likely returns undefined. To solve this issue, you must wait for the response to be received before using it in your code. The easiest way to achieve this is by handling your logic inside the then callback. Alternatively, you can utilize Promises or Async/Await.

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