--- title: Promise.prototype.catch() slug: Web/JavaScript/Reference/Global_Objects/Promise/catch tags: - ECMAScript6 - Method - Promise - Prototype - Referensi translation_of: Web/JavaScript/Reference/Global_Objects/Promise/catch ---
{{JSRef}}

Method catch() mengembalikan Promise dan hanya setuju jika kasusnya gagal. Sama halnya dengan memenggil method {{jsxref("Promise.then", "Promise.prototype.then(undefined, onRejected)")}}.

Sintaks

p.catch(onRejected);

p.catch(function(reason) {
   // rejection
});

Parameter

onRejected
 {{jsxref("Function")}} dipanggil ketika Promise ditolak. Fungsi ini memiliki satu argumen, alasan penolakan.

Deskripsi

Method catch sangat berguna untuk menangani error di gabungan promis anda.

Contoh

Penggunaan method catch

var p1 = new Promise(function(resolve, reject) {
  resolve('Success');
});

p1.then(function(value) {
  console.log(value); // "Success!"
  throw 'oh, no!';
}).catch(function(e) {
  console.log(e); // "oh, no!"
}).then(function(){
  console.log('after a catch the chain is restored');
}, function () {
  console.log('Not fired due to the catch');
});

// The following behaves the same as above
p1.then(function(value) {
  console.log(value); // "Success!"
  return Promise.reject('oh, no!');
}).catch(function(e) {
  console.log(e); // "oh, no!"
}).then(function(){
  console.log('after a catch the chain is restored');
}, function () {
  console.log('Not fired due to the catch');
});

Promis tidak dapat mendeteksi error pada asynchronous callback

var p1 = new Promise(function(resolve, reject) {
  throw 'Uh-oh!';
});

p1.catch(function(e) {
  console.log(e); // "Uh-oh!"
});


var p2 = new Promise(function(resolve, reject) {
  setTimeout(function() {
    throw 'Uncaught Exception!';
  }, 1000);
});

p2.catch(function(e) {
  console.log(e); // This is never called
});

Spesifikasi

Spesifikasi Status Comment
{{SpecName('ES6', '#sec-promise.prototype.catch', 'Promise.prototype.catch')}} {{Spec2('ES6')}} Initial definition in an ECMA standard.
{{SpecName('ESDraft', '#sec-promise.prototype.catch', 'Promise.prototype.catch')}} {{Spec2('ESDraft')}}  

Kompabilitas Browser

 

{{Compat("javascript.builtins.Promise.catch")}}

 

Lihat Juga