Angular 2 - multiple HTTP POST request : handle error from each request

Question

I am looking for a way where in i can post multiple HTTP POST requests and just in case there is error on one or more of them then i can know which of those got the error.

I tried implementing many logic via observables but no success. Please suggest.

Please add more details such as the code that you have tried — Vinay Prabhakaran
– Vinay Prabhakaran, Commented Mar 30, 2017 at 4:30

Community · Accepted Answer · 2017-05-23 12:32:23Z

1

You could use Promises

for all requestItems {
    http.post(url, body).toPromise().catch(error => {
       // This request failed.
    })
}

or if you want to wait for all to finish, you can collect the promises to an array and then use

Promise.all(promises)
    .catch(error => ...)
    .then(results => ...);

as can be seen in Handling errors in Promise.all

Edit:

You can use Promise.all this way:

// Create an array of your promises
const promises = [...];
const resolvedPromises = [];
promises.forEach(promise => {
    // Collect resolved promises - you may return some values from then and catch
    resolvedPromises.push(promise
        .then(result => 'OK')
        .catch(error => 'Error')
    );
});
Promise.all(resolvedPromises).then(results => {
    // results contains values returned from then/catch before
    console.log('Finished');
})

edited May 23, 2017 at 12:32

CommunityBot

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answered Mar 30, 2017 at 6:53

Ján Halaša

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4 Comments

borkovski Over a year ago

If you want to know which request threw exception catch them on individual promise level. Promise.all() will catch only the first one (all or nothing attitude).

mansi Over a year ago

I can't catch errors on individual promise level, because i need to wait for all promises to finish and then find out which all errored out. Promise.all won't help either.

Ján Halaša Over a year ago

I added an example of Promise.all() usage.

Ján Halaša Over a year ago

@mansi have you tried the code I added? If it helped, please mark the answer as accepted, if not, let me know what's the problem with it.

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