Mixing
How to await for the response of Alert dialog in React Native?
From my observation, the Alert dialog seems built on top of the React Native app.
So it pops out everytime you call it, and doesn't to be in the render function.
The catch is it is not an async task so the code after Alert will continue to execute regardless the callback function.
The code below demonstrates a situation where the Alert dialog keeps popping out because it reads the same barcode over and over again.
(It is written in TypeScript. Just take my word, this is a valid snippet.)
import * as React from "react";
import Camera from "react-native-camera";
import { Alert } from "react-native";
export default class BarcodeScanSreen extends React.Component<any ,any> {
private _camera;
private _onBarCodeRead = e => {
if (e.type === "QR_CODE") {
Alert.alert(
"QRCode detected",
"Do you like to run the QRCode?",
[
{ text: "No", onPress: this._onNoPress },
{ text: "Yes", onPress: this._onYesPress }
],
{ cancelable: false }
);
}
};
private _onYesPress = () => { /* process the QRCode */ }
private _onNoPress = () => { /* close the alert dialog. */ }
render() {
return (
<Camera
onBarCodeRead={this._onBarCodeRead}
aspect={Camera.constants.Aspect.fill}
ref={ref => (this._camera = ref)}
>
{/* Some another somponents which on top of the camera preview... */}
</Camera>
);
}
}
Is there a way to pause the JS code and await the response from Alert?
react-native
edited Sep 11 '18 at 22:42
Mojtaba Moshfeghi far
4681314
asked Feb 15 '18 at 14:37
FisNaNFisNaN
1,0991022
add a comment |
From my observation, the Alert dialog seems built on top of the React Native app.
So it pops out everytime you call it, and doesn't to be in the render function.
The catch is it is not an async task so the code after Alert will continue to execute regardless the callback function.
The code below demonstrates a situation where the Alert dialog keeps popping out because it reads the same barcode over and over again.
(It is written in TypeScript. Just take my word, this is a valid snippet.)
import * as React from "react";
import Camera from "react-native-camera";
import { Alert } from "react-native";
export default class BarcodeScanSreen extends React.Component<any ,any> {
private _camera;
private _onBarCodeRead = e => {
if (e.type === "QR_CODE") {
Alert.alert(
"QRCode detected",
"Do you like to run the QRCode?",
[
{ text: "No", onPress: this._onNoPress },
{ text: "Yes", onPress: this._onYesPress }
],
{ cancelable: false }
);
}
};
private _onYesPress = () => { /* process the QRCode */ }
private _onNoPress = () => { /* close the alert dialog. */ }
render() {
return (
<Camera
onBarCodeRead={this._onBarCodeRead}
aspect={Camera.constants.Aspect.fill}
ref={ref => (this._camera = ref)}
>
{/* Some another somponents which on top of the camera preview... */}
</Camera>
);
}
}
Is there a way to pause the JS code and await the response from Alert?
react-native
edited Sep 11 '18 at 22:42
Mojtaba Moshfeghi far
4681314
asked Feb 15 '18 at 14:37
FisNaNFisNaN
1,0991022
The simplest way would be to store a flag if the Alert is showing, and reset it to false when it is dismissed.
– yedidyak
Feb 15 '18 at 14:54
I had similar idea in mind. ButonBarCodeReadfunction still runs constantly in background to check the flag. I wonder if there is better way to handle this.
– FisNaN
Feb 15 '18 at 15:01
Hey, I just edited my answer because I published github.com/slorber/react-native-alert-async
– Sebastien Lorber
Nov 19 '18 at 18:47
add a comment |
From my observation, the Alert dialog seems built on top of the React Native app.
So it pops out everytime you call it, and doesn't to be in the render function.
The catch is it is not an async task so the code after Alert will continue to execute regardless the callback function.
The code below demonstrates a situation where the Alert dialog keeps popping out because it reads the same barcode over and over again.
(It is written in TypeScript. Just take my word, this is a valid snippet.)
import * as React from "react";
import Camera from "react-native-camera";
import { Alert } from "react-native";
export default class BarcodeScanSreen extends React.Component<any ,any> {
private _camera;
private _onBarCodeRead = e => {
if (e.type === "QR_CODE") {
Alert.alert(
"QRCode detected",
"Do you like to run the QRCode?",
[
{ text: "No", onPress: this._onNoPress },
{ text: "Yes", onPress: this._onYesPress }
],
{ cancelable: false }
);
}
};
private _onYesPress = () => { /* process the QRCode */ }
private _onNoPress = () => { /* close the alert dialog. */ }
render() {
return (
<Camera
onBarCodeRead={this._onBarCodeRead}
aspect={Camera.constants.Aspect.fill}
ref={ref => (this._camera = ref)}
>
{/* Some another somponents which on top of the camera preview... */}
</Camera>
);
}
}
Is there a way to pause the JS code and await the response from Alert?
react-native
edited Sep 11 '18 at 22:42
Mojtaba Moshfeghi far
4681314
asked Feb 15 '18 at 14:37
FisNaNFisNaN
1,0991022
From my observation, the Alert dialog seems built on top of the React Native app.
So it pops out everytime you call it, and doesn't to be in the render function.
The catch is it is not an async task so the code after Alert will continue to execute regardless the callback function.
The code below demonstrates a situation where the Alert dialog keeps popping out because it reads the same barcode over and over again.
(It is written in TypeScript. Just take my word, this is a valid snippet.)
import * as React from "react";
import Camera from "react-native-camera";
import { Alert } from "react-native";
export default class BarcodeScanSreen extends React.Component<any ,any> {
private _camera;
private _onBarCodeRead = e => {
if (e.type === "QR_CODE") {
Alert.alert(
"QRCode detected",
"Do you like to run the QRCode?",
[
{ text: "No", onPress: this._onNoPress },
{ text: "Yes", onPress: this._onYesPress }
],
{ cancelable: false }
);
}
};
private _onYesPress = () => { /* process the QRCode */ }
private _onNoPress = () => { /* close the alert dialog. */ }
render() {
return (
<Camera
onBarCodeRead={this._onBarCodeRead}
aspect={Camera.constants.Aspect.fill}
ref={ref => (this._camera = ref)}
>
{/* Some another somponents which on top of the camera preview... */}
</Camera>
);
}
}
Is there a way to pause the JS code and await the response from Alert?
react-native
react-native
edited Sep 11 '18 at 22:42
Mojtaba Moshfeghi far
4681314
asked Feb 15 '18 at 14:37
FisNaNFisNaN
1,0991022
edited Sep 11 '18 at 22:42
Mojtaba Moshfeghi far
4681314
asked Feb 15 '18 at 14:37
FisNaNFisNaN
1,0991022
edited Sep 11 '18 at 22:42
Mojtaba Moshfeghi far
4681314
edited Sep 11 '18 at 22:42
Mojtaba Moshfeghi far
4681314
edited Sep 11 '18 at 22:42
Mojtaba Moshfeghi far
4681314
4681314
asked Feb 15 '18 at 14:37
FisNaNFisNaN
1,0991022
asked Feb 15 '18 at 14:37
FisNaNFisNaN
1,0991022
asked Feb 15 '18 at 14:37
FisNaNFisNaN
1,0991022
1,0991022
The simplest way would be to store a flag if the Alert is showing, and reset it to false when it is dismissed.
– yedidyak
Feb 15 '18 at 14:54
I had similar idea in mind. ButonBarCodeReadfunction still runs constantly in background to check the flag. I wonder if there is better way to handle this.
– FisNaN
Feb 15 '18 at 15:01
Hey, I just edited my answer because I published github.com/slorber/react-native-alert-async
– Sebastien Lorber
Nov 19 '18 at 18:47
add a comment |
The simplest way would be to store a flag if the Alert is showing, and reset it to false when it is dismissed.
– yedidyak
Feb 15 '18 at 14:54
I had similar idea in mind. ButonBarCodeReadfunction still runs constantly in background to check the flag. I wonder if there is better way to handle this.
– FisNaN
Feb 15 '18 at 15:01
Hey, I just edited my answer because I published github.com/slorber/react-native-alert-async
– Sebastien Lorber
Nov 19 '18 at 18:47
The simplest way would be to store a flag if the Alert is showing, and reset it to false when it is dismissed.
– yedidyak
Feb 15 '18 at 14:54
The simplest way would be to store a flag if the Alert is showing, and reset it to false when it is dismissed.
– yedidyak
Feb 15 '18 at 14:54
I had similar idea in mind. But
onBarCodeRead function still runs constantly in background to check the flag. I wonder if there is better way to handle this.– FisNaN
Feb 15 '18 at 15:01
I had similar idea in mind. But
onBarCodeRead function still runs constantly in background to check the flag. I wonder if there is better way to handle this.– FisNaN
Feb 15 '18 at 15:01
Hey, I just edited my answer because I published github.com/slorber/react-native-alert-async
– Sebastien Lorber
Nov 19 '18 at 18:47
Hey, I just edited my answer because I published github.com/slorber/react-native-alert-async
– Sebastien Lorber
Nov 19 '18 at 18:47
add a comment |
3 Answers
3
active
oldest
votes
Alert does not pause the code. In this case JS is not the only problem - the Camera component also keeps running in the background which is native and it will trigger the onBarCodeRead listener, regardless if the Alert is present or not.
You could try to stop the camera at the beginning on _onBarCodeRead with the stopPreview() method mentioned in the docs.
Also note that react-native-camera is currently in a migration process from Camera (RCTCamera) to RNCamera and in the new RNCamera I don't see a stopPreview() method. Anyhow, a simple flag would also do the job.
answered Feb 15 '18 at 15:47
nicemanniceman
88111
Yes, I had the same problem.stopPreview()is deprecated inRNCameramodule. I noticed that, sometimesAlertinterrupts with the_onObjectDetectedinRNCamera, so the barcode scanning feature completely stops after dismissing the dialog.
– FisNaN
Feb 15 '18 at 23:57
add a comment |
Use react-native-alert-async
I've just published a package that does exactly this and permit to await for the choice of the user. It is compatible with Expo.
import AlertAsync from "react-native-alert-async";
const myAction = async () => {
const choice = await AlertAsync(
'Title',
'Message',
[
{text: 'Yes', onPress: () => 'yes'},
{text: 'No', onPress: () => Promise.resolve('no')},
],
{
cancelable: true,
onDismiss: () => 'no',
},
);
if (choice === 'yes') {
doSomething();
}
else {
doSomethingElse();
}
}
Original answer: I've made a PR to ReactNative for this feature: https://github.com/facebook/react-native/pull/20312
answered Nov 13 '18 at 14:56
Sebastien LorberSebastien Lorber
51.9k37205333
tripped into this problem again when I try to build a custom dropdown menu for react-naviagtion navbar. I will give it a try, thanks a lot
– FisNaN
Nov 13 '18 at 20:56
add a comment |
React-native Alert doesn't stop the execution of code below it. By changing it to async function which resolves the promise on user action will work as ASYNC-Alert.
const AsyncAlert = async () => new Promise((resolve) => {
Alert.alert(
'info',
'Message',
[
{
text: 'ok',
onPress: () => {
resolve('YES');
},
},
],
{ cancelable: false },
);
});
await AsyncAlert();answered Oct 25 '18 at 20:20
nanda kishore reddynanda kishore reddy
1696
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
Alert does not pause the code. In this case JS is not the only problem - the Camera component also keeps running in the background which is native and it will trigger the onBarCodeRead listener, regardless if the Alert is present or not.
You could try to stop the camera at the beginning on _onBarCodeRead with the stopPreview() method mentioned in the docs.
Also note that react-native-camera is currently in a migration process from Camera (RCTCamera) to RNCamera and in the new RNCamera I don't see a stopPreview() method. Anyhow, a simple flag would also do the job.
answered Feb 15 '18 at 15:47
nicemanniceman
88111
Yes, I had the same problem.stopPreview()is deprecated inRNCameramodule. I noticed that, sometimesAlertinterrupts with the_onObjectDetectedinRNCamera, so the barcode scanning feature completely stops after dismissing the dialog.
– FisNaN
Feb 15 '18 at 23:57
add a comment |
Alert does not pause the code. In this case JS is not the only problem - the Camera component also keeps running in the background which is native and it will trigger the onBarCodeRead listener, regardless if the Alert is present or not.
You could try to stop the camera at the beginning on _onBarCodeRead with the stopPreview() method mentioned in the docs.
Also note that react-native-camera is currently in a migration process from Camera (RCTCamera) to RNCamera and in the new RNCamera I don't see a stopPreview() method. Anyhow, a simple flag would also do the job.
answered Feb 15 '18 at 15:47
nicemanniceman
88111
Yes, I had the same problem.stopPreview()is deprecated inRNCameramodule. I noticed that, sometimesAlertinterrupts with the_onObjectDetectedinRNCamera, so the barcode scanning feature completely stops after dismissing the dialog.
– FisNaN
Feb 15 '18 at 23:57
add a comment |
Alert does not pause the code. In this case JS is not the only problem - the Camera component also keeps running in the background which is native and it will trigger the onBarCodeRead listener, regardless if the Alert is present or not.
You could try to stop the camera at the beginning on _onBarCodeRead with the stopPreview() method mentioned in the docs.
Also note that react-native-camera is currently in a migration process from Camera (RCTCamera) to RNCamera and in the new RNCamera I don't see a stopPreview() method. Anyhow, a simple flag would also do the job.
answered Feb 15 '18 at 15:47
nicemanniceman
88111
Alert does not pause the code. In this case JS is not the only problem - the Camera component also keeps running in the background which is native and it will trigger the onBarCodeRead listener, regardless if the Alert is present or not.
You could try to stop the camera at the beginning on _onBarCodeRead with the stopPreview() method mentioned in the docs.
Also note that react-native-camera is currently in a migration process from Camera (RCTCamera) to RNCamera and in the new RNCamera I don't see a stopPreview() method. Anyhow, a simple flag would also do the job.
answered Feb 15 '18 at 15:47
nicemanniceman
88111
answered Feb 15 '18 at 15:47
nicemanniceman
88111
answered Feb 15 '18 at 15:47
nicemanniceman
88111
answered Feb 15 '18 at 15:47
nicemanniceman
88111
88111
Yes, I had the same problem.stopPreview()is deprecated inRNCameramodule. I noticed that, sometimesAlertinterrupts with the_onObjectDetectedinRNCamera, so the barcode scanning feature completely stops after dismissing the dialog.
– FisNaN
Feb 15 '18 at 23:57
add a comment |
Yes, I had the same problem.stopPreview()is deprecated inRNCameramodule. I noticed that, sometimesAlertinterrupts with the_onObjectDetectedinRNCamera, so the barcode scanning feature completely stops after dismissing the dialog.
– FisNaN
Feb 15 '18 at 23:57
Yes, I had the same problem.
stopPreview() is deprecated in RNCamera module. I noticed that, sometimes Alert interrupts with the _onObjectDetected in RNCamera, so the barcode scanning feature completely stops after dismissing the dialog.– FisNaN
Feb 15 '18 at 23:57
Yes, I had the same problem.
stopPreview() is deprecated in RNCamera module. I noticed that, sometimes Alert interrupts with the _onObjectDetected in RNCamera, so the barcode scanning feature completely stops after dismissing the dialog.– FisNaN
Feb 15 '18 at 23:57
add a comment |
Use react-native-alert-async
I've just published a package that does exactly this and permit to await for the choice of the user. It is compatible with Expo.
import AlertAsync from "react-native-alert-async";
const myAction = async () => {
const choice = await AlertAsync(
'Title',
'Message',
[
{text: 'Yes', onPress: () => 'yes'},
{text: 'No', onPress: () => Promise.resolve('no')},
],
{
cancelable: true,
onDismiss: () => 'no',
},
);
if (choice === 'yes') {
doSomething();
}
else {
doSomethingElse();
}
}
Original answer: I've made a PR to ReactNative for this feature: https://github.com/facebook/react-native/pull/20312
answered Nov 13 '18 at 14:56
Sebastien LorberSebastien Lorber
51.9k37205333
tripped into this problem again when I try to build a custom dropdown menu for react-naviagtion navbar. I will give it a try, thanks a lot
– FisNaN
Nov 13 '18 at 20:56
add a comment |
Use react-native-alert-async
I've just published a package that does exactly this and permit to await for the choice of the user. It is compatible with Expo.
import AlertAsync from "react-native-alert-async";
const myAction = async () => {
const choice = await AlertAsync(
'Title',
'Message',
[
{text: 'Yes', onPress: () => 'yes'},
{text: 'No', onPress: () => Promise.resolve('no')},
],
{
cancelable: true,
onDismiss: () => 'no',
},
);
if (choice === 'yes') {
doSomething();
}
else {
doSomethingElse();
}
}
Original answer: I've made a PR to ReactNative for this feature: https://github.com/facebook/react-native/pull/20312
answered Nov 13 '18 at 14:56
Sebastien LorberSebastien Lorber
51.9k37205333
tripped into this problem again when I try to build a custom dropdown menu for react-naviagtion navbar. I will give it a try, thanks a lot
– FisNaN
Nov 13 '18 at 20:56
add a comment |
Use react-native-alert-async
I've just published a package that does exactly this and permit to await for the choice of the user. It is compatible with Expo.
import AlertAsync from "react-native-alert-async";
const myAction = async () => {
const choice = await AlertAsync(
'Title',
'Message',
[
{text: 'Yes', onPress: () => 'yes'},
{text: 'No', onPress: () => Promise.resolve('no')},
],
{
cancelable: true,
onDismiss: () => 'no',
},
);
if (choice === 'yes') {
doSomething();
}
else {
doSomethingElse();
}
}
Original answer: I've made a PR to ReactNative for this feature: https://github.com/facebook/react-native/pull/20312
answered Nov 13 '18 at 14:56
Sebastien LorberSebastien Lorber
51.9k37205333
Use react-native-alert-async
I've just published a package that does exactly this and permit to await for the choice of the user. It is compatible with Expo.
import AlertAsync from "react-native-alert-async";
const myAction = async () => {
const choice = await AlertAsync(
'Title',
'Message',
[
{text: 'Yes', onPress: () => 'yes'},
{text: 'No', onPress: () => Promise.resolve('no')},
],
{
cancelable: true,
onDismiss: () => 'no',
},
);
if (choice === 'yes') {
doSomething();
}
else {
doSomethingElse();
}
}
Original answer: I've made a PR to ReactNative for this feature: https://github.com/facebook/react-native/pull/20312
answered Nov 13 '18 at 14:56
Sebastien LorberSebastien Lorber
51.9k37205333
edited Nov 19 '18 at 18:47
answered Nov 13 '18 at 14:56
Sebastien LorberSebastien Lorber
51.9k37205333
answered Nov 13 '18 at 14:56
Sebastien LorberSebastien Lorber
51.9k37205333
answered Nov 13 '18 at 14:56
Sebastien LorberSebastien Lorber
51.9k37205333
51.9k37205333
tripped into this problem again when I try to build a custom dropdown menu for react-naviagtion navbar. I will give it a try, thanks a lot
– FisNaN
Nov 13 '18 at 20:56
add a comment |
tripped into this problem again when I try to build a custom dropdown menu for react-naviagtion navbar. I will give it a try, thanks a lot
– FisNaN
Nov 13 '18 at 20:56
tripped into this problem again when I try to build a custom dropdown menu for react-naviagtion navbar. I will give it a try, thanks a lot
– FisNaN
Nov 13 '18 at 20:56
tripped into this problem again when I try to build a custom dropdown menu for react-naviagtion navbar. I will give it a try, thanks a lot
– FisNaN
Nov 13 '18 at 20:56
add a comment |
React-native Alert doesn't stop the execution of code below it. By changing it to async function which resolves the promise on user action will work as ASYNC-Alert.
const AsyncAlert = async () => new Promise((resolve) => {
Alert.alert(
'info',
'Message',
[
{
text: 'ok',
onPress: () => {
resolve('YES');
},
},
],
{ cancelable: false },
);
});
await AsyncAlert();answered Oct 25 '18 at 20:20
nanda kishore reddynanda kishore reddy
1696
add a comment |
React-native Alert doesn't stop the execution of code below it. By changing it to async function which resolves the promise on user action will work as ASYNC-Alert.
const AsyncAlert = async () => new Promise((resolve) => {
Alert.alert(
'info',
'Message',
[
{
text: 'ok',
onPress: () => {
resolve('YES');
},
},
],
{ cancelable: false },
);
});
await AsyncAlert();answered Oct 25 '18 at 20:20
nanda kishore reddynanda kishore reddy
1696
add a comment |
React-native Alert doesn't stop the execution of code below it. By changing it to async function which resolves the promise on user action will work as ASYNC-Alert.
const AsyncAlert = async () => new Promise((resolve) => {
Alert.alert(
'info',
'Message',
[
{
text: 'ok',
onPress: () => {
resolve('YES');
},
},
],
{ cancelable: false },
);
});
await AsyncAlert();answered Oct 25 '18 at 20:20
nanda kishore reddynanda kishore reddy
1696
React-native Alert doesn't stop the execution of code below it. By changing it to async function which resolves the promise on user action will work as ASYNC-Alert.
const AsyncAlert = async () => new Promise((resolve) => {
Alert.alert(
'info',
'Message',
[
{
text: 'ok',
onPress: () => {
resolve('YES');
},
},
],
{ cancelable: false },
);
});
await AsyncAlert();const AsyncAlert = async () => new Promise((resolve) => {
Alert.alert(
'info',
'Message',
[
{
text: 'ok',
onPress: () => {
resolve('YES');
},
},
],
{ cancelable: false },
);
});
await AsyncAlert();const AsyncAlert = async () => new Promise((resolve) => {
Alert.alert(
'info',
'Message',
[
{
text: 'ok',
onPress: () => {
resolve('YES');
},
},
],
{ cancelable: false },
);
});
await AsyncAlert();answered Oct 25 '18 at 20:20
nanda kishore reddynanda kishore reddy
1696
answered Oct 25 '18 at 20:20
nanda kishore reddynanda kishore reddy
1696
answered Oct 25 '18 at 20:20
nanda kishore reddynanda kishore reddy
1696
answered Oct 25 '18 at 20:20
nanda kishore reddynanda kishore reddy
1696
1696
add a comment |
add a comment |
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The simplest way would be to store a flag if the Alert is showing, and reset it to false when it is dismissed.
– yedidyak
Feb 15 '18 at 14:54
I had similar idea in mind. But
onBarCodeReadfunction still runs constantly in background to check the flag. I wonder if there is better way to handle this.– FisNaN
Feb 15 '18 at 15:01
Hey, I just edited my answer because I published github.com/slorber/react-native-alert-async
– Sebastien Lorber
Nov 19 '18 at 18:47