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Add unsubscribe() to preventing-going-back example #1269

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48 changes: 25 additions & 23 deletions static/examples/5.x/prevent-going-back.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,31 +9,33 @@ const EditTextScreen = ({ navigation }) => {

const hasUnsavedChanges = Boolean(text);

React.useEffect(
() =>
navigation.addListener('beforeRemove', (e) => {
const action = e.data.action;
if (!hasUnsavedChanges) {
return;
}
React.useEffect(() => {
const unsubscribe = navigation.addListener('beforeRemove', (e) => {
const action = e.data.action;
if (!hasUnsavedChanges) {
return;
}

e.preventDefault();
e.preventDefault();

Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
onPress: () => navigation.dispatch(action),
},
]
);
}),
[hasUnsavedChanges, navigation]
);
Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
onPress: () => navigation.dispatch(action),
},
]
);
});

return () => {
unsubscribe();
};
}, [hasUnsavedChanges, navigation]);

return (
<View style={styles.content}>
Expand Down
48 changes: 25 additions & 23 deletions static/examples/6.x/prevent-going-back.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,31 +9,33 @@ const EditTextScreen = ({ navigation }) => {

const hasUnsavedChanges = Boolean(text);

React.useEffect(
() =>
navigation.addListener('beforeRemove', (e) => {
const action = e.data.action;
if (!hasUnsavedChanges) {
return;
}
React.useEffect(() => {
const unsubscribe = navigation.addListener('beforeRemove', (e) => {
const action = e.data.action;
if (!hasUnsavedChanges) {
return;
}

e.preventDefault();
e.preventDefault();

Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
onPress: () => navigation.dispatch(action),
},
]
);
}),
[hasUnsavedChanges, navigation]
);
Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
onPress: () => navigation.dispatch(action),
},
]
);
});

return () => {
unsubscribe();
};
}, [hasUnsavedChanges, navigation]);

return (
<View style={styles.content}>
Expand Down
48 changes: 25 additions & 23 deletions static/examples/7.x/prevent-going-back.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,31 +9,33 @@ const EditTextScreen = ({ navigation }) => {

const hasUnsavedChanges = Boolean(text);

React.useEffect(
() =>
navigation.addListener('beforeRemove', (e) => {
const action = e.data.action;
if (!hasUnsavedChanges) {
return;
}
React.useEffect(() => {
const unsubscribe = navigation.addListener('beforeRemove', (e) => {
const action = e.data.action;
if (!hasUnsavedChanges) {
return;
}

e.preventDefault();
e.preventDefault();

Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
onPress: () => navigation.dispatch(action),
},
]
);
}),
[hasUnsavedChanges, navigation]
);
Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
onPress: () => navigation.dispatch(action),
},
]
);
});

return () => {
unsubscribe();
};
}, [hasUnsavedChanges, navigation]);

return (
<View style={styles.content}>
Expand Down
61 changes: 32 additions & 29 deletions versioned_docs/version-5.x/preventing-going-back.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -28,35 +28,38 @@ function EditText({ navigation }) {
const [text, setText] = React.useState('');
const hasUnsavedChanges = Boolean(text);

React.useEffect(
() =>
navigation.addListener('beforeRemove', (e) => {
if (!hasUnsavedChanges) {
// If we don't have unsaved changes, then we don't need to do anything
return;
}

// Prevent default behavior of leaving the screen
e.preventDefault();

// Prompt the user before leaving the screen
Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
// If the user confirmed, then we dispatch the action we blocked earlier
// This will continue the action that had triggered the removal of the screen
onPress: () => navigation.dispatch(e.data.action),
},
]
);
}),
[navigation, hasUnsavedChanges]
);
React.useEffect(() => {
const unsubscribe = navigation.addListener('beforeRemove', (e) => {
if (!hasUnsavedChanges) {
// If we don't have unsaved changes, then we don't need to do anything
return;
}

// Prevent default behavior of leaving the screen
e.preventDefault();

// Prompt the user before leaving the screen
Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
// If the user confirmed, then we dispatch the action we blocked earlier
// This will continue the action that had triggered the removal of the screen
onPress: () => navigation.dispatch(e.data.action),
},
]
);
});

// Unsubscribe the listener when the component unmounts to avoid memory leaks
return () => {
unsubscribe();
};
}, [navigation, hasUnsavedChanges]);

return (
<TextInput
Expand Down
61 changes: 32 additions & 29 deletions versioned_docs/version-6.x/preventing-going-back.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -17,35 +17,38 @@ function EditText({ navigation }) {
const [text, setText] = React.useState('');
const hasUnsavedChanges = Boolean(text);

React.useEffect(
() =>
navigation.addListener('beforeRemove', (e) => {
if (!hasUnsavedChanges) {
// If we don't have unsaved changes, then we don't need to do anything
return;
}

// Prevent default behavior of leaving the screen
e.preventDefault();

// Prompt the user before leaving the screen
Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
// If the user confirmed, then we dispatch the action we blocked earlier
// This will continue the action that had triggered the removal of the screen
onPress: () => navigation.dispatch(e.data.action),
},
]
);
}),
[navigation, hasUnsavedChanges]
);
React.useEffect(() => {
const unsubscribe = navigation.addListener('beforeRemove', (e) => {
if (!hasUnsavedChanges) {
// If we don't have unsaved changes, then we don't need to do anything
return;
}

// Prevent default behavior of leaving the screen
e.preventDefault();

// Prompt the user before leaving the screen
Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
// If the user confirmed, then we dispatch the action we blocked earlier
// This will continue the action that had triggered the removal of the screen
onPress: () => navigation.dispatch(e.data.action),
},
]
);
});

// Unsubscribe the listener when the component unmounts to avoid memory leaks
return () => {
unsubscribe();
};
}, [navigation, hasUnsavedChanges]);

return (
<TextInput
Expand Down
61 changes: 32 additions & 29 deletions versioned_docs/version-7.x/preventing-going-back.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -17,35 +17,38 @@ function EditText({ navigation }) {
const [text, setText] = React.useState('');
const hasUnsavedChanges = Boolean(text);

React.useEffect(
() =>
navigation.addListener('beforeRemove', (e) => {
if (!hasUnsavedChanges) {
// If we don't have unsaved changes, then we don't need to do anything
return;
}

// Prevent default behavior of leaving the screen
e.preventDefault();

// Prompt the user before leaving the screen
Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
// If the user confirmed, then we dispatch the action we blocked earlier
// This will continue the action that had triggered the removal of the screen
onPress: () => navigation.dispatch(e.data.action),
},
]
);
}),
[navigation, hasUnsavedChanges]
);
React.useEffect(() => {
const unsubscribe = navigation.addListener('beforeRemove', (e) => {
if (!hasUnsavedChanges) {
// If we don't have unsaved changes, then we don't need to do anything
return;
}

// Prevent default behavior of leaving the screen
e.preventDefault();

// Prompt the user before leaving the screen
Alert.alert(
'Discard changes?',
'You have unsaved changes. Are you sure to discard them and leave the screen?',
[
{ text: "Don't leave", style: 'cancel', onPress: () => {} },
{
text: 'Discard',
style: 'destructive',
// If the user confirmed, then we dispatch the action we blocked earlier
// This will continue the action that had triggered the removal of the screen
onPress: () => navigation.dispatch(e.data.action),
},
]
);
});

// Unsubscribe the listener when the component unmounts to avoid memory leaks
return () => {
unsubscribe();
};
}, [navigation, hasUnsavedChanges]);

return (
<TextInput
Expand Down