How can you proceed with a loop in Angular even after receiving a 404 response?

Question

How can you proceed with a loop in Angular even after receiving a 404 response?

I couldn't find a solution on how to handle the 404 response within a loop in Angular, so I'm reaching out for help here.

Here's the code snippet I'm working with:

for(let order of orders){
    this.api.getURL(order.resource_url).then(data =>
        this.detail = data;
    );
    // Do something with this.detail ...
}

If the request returns a 404 response, I need the loop to move on to the next order and check for a valid response. Any suggestions on how to achieve this?

angular typescript http-status-code-404 httpresponse

Answer 1

Answer №1

When the server responds with a 404 error, an exception is thrown. To prevent this, you need to handle the error:

for(let order of orders){
  this.api.getURL(order.resource_url).then(data => {
    this.detail = data;
  }, error => {
    // The error has been handled
  });
}

UPDATE

You may be facing difficulties because you are attempting to utilize an asynchronous API synchronously :) Consider filtering out failed responses before proceeding with your computations:

Promise.all(
 orders.map(order => this.api.getURL(order.resource_url).catch(() => null))
).then(responses => {
  const successfulResponses = responses.filter(response => response != null)
  for(let data of successfulResponses) {
    // Continue with your code here
  }
});

Answer 2

When the server responds with a 404 error, an exception is thrown. To prevent this, you need to handle the error:

for(let order of orders){
  this.api.getURL(order.resource_url).then(data => {
    this.detail = data;
  }, error => {
    // The error has been handled
  });
}

UPDATE

You may be facing difficulties because you are attempting to utilize an asynchronous API synchronously :) Consider filtering out failed responses before proceeding with your computations:

Promise.all(
 orders.map(order => this.api.getURL(order.resource_url).catch(() => null))
).then(responses => {
  const successfulResponses = responses.filter(response => response != null)
  for(let data of successfulResponses) {
    // Continue with your code here
  }
});

Answer 3

Answer №2

According to shumih, it is important to identify and address the error in order to proceed effectively. In the event of an error, you can use the continue; statement to skip to the next iteration of your loop. Specifically, the line: this.detail = data should not be run if a 404 error occurs because no promise is returned, preventing it from entering the then({}) section.

Answer 4

According to shumih, it is important to identify and address the error in order to proceed effectively. In the event of an error, you can use the continue; statement to skip to the next iteration of your loop. Specifically, the line: this.detail = data should not be run if a 404 error occurs because no promise is returned, preventing it from entering the then({}) section.

How can you proceed with a loop in Angular even after receiving a 404 response?

Answer №1

Answer №2

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