Not able to catch error for .on() in firebase
I am using below code to retrieve a value
try {
discountFbRef.orderByChild('discode').equalTo(code).on("value", function(snapshot) {
console.log('snapshot val discode', snapshot.val().discode);
if (snapshot.exists()) {
snapshot.forEach(function(data) {
$scope.discountApplicable.id = data.val().id;
});
} else {
console.log('It doesnt exist');
}
}, function(error) {
console.log(error);
});
} catch (error) {
console.log('error occured during search', error);
}
When there is value equal to the search string it's working fine. But when I try to find a keyword that doesn't exist in "discode", It throws
Uncaught TypeError: Cannot read property 'discode' of null
For some reason even though I try to catch the error with try-catch and error function I am not able to catch it.
I need a way to handle the error and show message that search string doesn't exist.
javascript firebase firebase-realtime-database error-handling
edited Nov 22 '18 at 2:44
zynkn
3,90821030
asked Nov 22 '18 at 2:40
VamsigaVamsiga
13
add a comment |
I am using below code to retrieve a value
try {
discountFbRef.orderByChild('discode').equalTo(code).on("value", function(snapshot) {
console.log('snapshot val discode', snapshot.val().discode);
if (snapshot.exists()) {
snapshot.forEach(function(data) {
$scope.discountApplicable.id = data.val().id;
});
} else {
console.log('It doesnt exist');
}
}, function(error) {
console.log(error);
});
} catch (error) {
console.log('error occured during search', error);
}
When there is value equal to the search string it's working fine. But when I try to find a keyword that doesn't exist in "discode", It throws
Uncaught TypeError: Cannot read property 'discode' of null
For some reason even though I try to catch the error with try-catch and error function I am not able to catch it.
I need a way to handle the error and show message that search string doesn't exist.
javascript firebase firebase-realtime-database error-handling
edited Nov 22 '18 at 2:44
zynkn
3,90821030
asked Nov 22 '18 at 2:40
VamsigaVamsiga
13
add a comment |
I am using below code to retrieve a value
try {
discountFbRef.orderByChild('discode').equalTo(code).on("value", function(snapshot) {
console.log('snapshot val discode', snapshot.val().discode);
if (snapshot.exists()) {
snapshot.forEach(function(data) {
$scope.discountApplicable.id = data.val().id;
});
} else {
console.log('It doesnt exist');
}
}, function(error) {
console.log(error);
});
} catch (error) {
console.log('error occured during search', error);
}
When there is value equal to the search string it's working fine. But when I try to find a keyword that doesn't exist in "discode", It throws
Uncaught TypeError: Cannot read property 'discode' of null
For some reason even though I try to catch the error with try-catch and error function I am not able to catch it.
I need a way to handle the error and show message that search string doesn't exist.
javascript firebase firebase-realtime-database error-handling
edited Nov 22 '18 at 2:44
zynkn
3,90821030
asked Nov 22 '18 at 2:40
VamsigaVamsiga
13
I am using below code to retrieve a value
try {
discountFbRef.orderByChild('discode').equalTo(code).on("value", function(snapshot) {
console.log('snapshot val discode', snapshot.val().discode);
if (snapshot.exists()) {
snapshot.forEach(function(data) {
$scope.discountApplicable.id = data.val().id;
});
} else {
console.log('It doesnt exist');
}
}, function(error) {
console.log(error);
});
} catch (error) {
console.log('error occured during search', error);
}
When there is value equal to the search string it's working fine. But when I try to find a keyword that doesn't exist in "discode", It throws
Uncaught TypeError: Cannot read property 'discode' of null
For some reason even though I try to catch the error with try-catch and error function I am not able to catch it.
I need a way to handle the error and show message that search string doesn't exist.
javascript firebase firebase-realtime-database error-handling
javascript firebase firebase-realtime-database error-handling
edited Nov 22 '18 at 2:44
zynkn
3,90821030
asked Nov 22 '18 at 2:40
VamsigaVamsiga
13
edited Nov 22 '18 at 2:44
zynkn
3,90821030
asked Nov 22 '18 at 2:40
VamsigaVamsiga
13
edited Nov 22 '18 at 2:44
zynkn
3,90821030
edited Nov 22 '18 at 2:44
zynkn
3,90821030
edited Nov 22 '18 at 2:44
zynkn
3,90821030
3,90821030
asked Nov 22 '18 at 2:40
VamsigaVamsiga
13
asked Nov 22 '18 at 2:40
VamsigaVamsiga
13
asked Nov 22 '18 at 2:40
VamsigaVamsiga
13
13
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
So, the functions that are passed to the second and third parameters of .on are called a callback functions. That means they might get called after (asynchronously) the code you've posted has executed. You'll want to move your try-catch inside of the callback function.
function handleValueSuccess(snapshot) {
try {
console.log('snapshot val discode', snapshot.val().discode);
if (snapshot.exists()) {
snapshot.forEach(function(data) {
$scope.discountApplicable.id = data.val().id;
});
} else {
console.log("It doesn't exist");
}
} catch (error) {
console.log('error occurred during search', error);
}
}
function handleValueError(error) {
console.log('error occurred on value', error);
}
discountFbRef
.orderByChild('discode')
.equalTo(code)
.on("value", handleValueSuccess, handleValueError);
answered Nov 22 '18 at 2:47
Matthew HerbstMatthew Herbst
10.6k134687
I moved them to the call back function it didn't catch errors. I'm not sure how would it work because there is a console.log() inside the call back it doesn't log anything. May be I did something wrong could you show the code based on my code?
– Vamsiga
Nov 22 '18 at 4:42
@Vamsiga I edited my answer to show what I was thinking. Does that not work for you?
– Matthew Herbst
Nov 22 '18 at 4:51
1
Thanks it worked, I put try catch after the console.log() which is doing the snapshot.val().discode.
– Vamsiga
Nov 22 '18 at 5:00
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
So, the functions that are passed to the second and third parameters of .on are called a callback functions. That means they might get called after (asynchronously) the code you've posted has executed. You'll want to move your try-catch inside of the callback function.
function handleValueSuccess(snapshot) {
try {
console.log('snapshot val discode', snapshot.val().discode);
if (snapshot.exists()) {
snapshot.forEach(function(data) {
$scope.discountApplicable.id = data.val().id;
});
} else {
console.log("It doesn't exist");
}
} catch (error) {
console.log('error occurred during search', error);
}
}
function handleValueError(error) {
console.log('error occurred on value', error);
}
discountFbRef
.orderByChild('discode')
.equalTo(code)
.on("value", handleValueSuccess, handleValueError);
answered Nov 22 '18 at 2:47
Matthew HerbstMatthew Herbst
10.6k134687
I moved them to the call back function it didn't catch errors. I'm not sure how would it work because there is a console.log() inside the call back it doesn't log anything. May be I did something wrong could you show the code based on my code?
– Vamsiga
Nov 22 '18 at 4:42
@Vamsiga I edited my answer to show what I was thinking. Does that not work for you?
– Matthew Herbst
Nov 22 '18 at 4:51
1
Thanks it worked, I put try catch after the console.log() which is doing the snapshot.val().discode.
– Vamsiga
Nov 22 '18 at 5:00
add a comment |
So, the functions that are passed to the second and third parameters of .on are called a callback functions. That means they might get called after (asynchronously) the code you've posted has executed. You'll want to move your try-catch inside of the callback function.
function handleValueSuccess(snapshot) {
try {
console.log('snapshot val discode', snapshot.val().discode);
if (snapshot.exists()) {
snapshot.forEach(function(data) {
$scope.discountApplicable.id = data.val().id;
});
} else {
console.log("It doesn't exist");
}
} catch (error) {
console.log('error occurred during search', error);
}
}
function handleValueError(error) {
console.log('error occurred on value', error);
}
discountFbRef
.orderByChild('discode')
.equalTo(code)
.on("value", handleValueSuccess, handleValueError);
answered Nov 22 '18 at 2:47
Matthew HerbstMatthew Herbst
10.6k134687
I moved them to the call back function it didn't catch errors. I'm not sure how would it work because there is a console.log() inside the call back it doesn't log anything. May be I did something wrong could you show the code based on my code?
– Vamsiga
Nov 22 '18 at 4:42
@Vamsiga I edited my answer to show what I was thinking. Does that not work for you?
– Matthew Herbst
Nov 22 '18 at 4:51
1
Thanks it worked, I put try catch after the console.log() which is doing the snapshot.val().discode.
– Vamsiga
Nov 22 '18 at 5:00
add a comment |
So, the functions that are passed to the second and third parameters of .on are called a callback functions. That means they might get called after (asynchronously) the code you've posted has executed. You'll want to move your try-catch inside of the callback function.
function handleValueSuccess(snapshot) {
try {
console.log('snapshot val discode', snapshot.val().discode);
if (snapshot.exists()) {
snapshot.forEach(function(data) {
$scope.discountApplicable.id = data.val().id;
});
} else {
console.log("It doesn't exist");
}
} catch (error) {
console.log('error occurred during search', error);
}
}
function handleValueError(error) {
console.log('error occurred on value', error);
}
discountFbRef
.orderByChild('discode')
.equalTo(code)
.on("value", handleValueSuccess, handleValueError);
answered Nov 22 '18 at 2:47
Matthew HerbstMatthew Herbst
10.6k134687
So, the functions that are passed to the second and third parameters of .on are called a callback functions. That means they might get called after (asynchronously) the code you've posted has executed. You'll want to move your try-catch inside of the callback function.
function handleValueSuccess(snapshot) {
try {
console.log('snapshot val discode', snapshot.val().discode);
if (snapshot.exists()) {
snapshot.forEach(function(data) {
$scope.discountApplicable.id = data.val().id;
});
} else {
console.log("It doesn't exist");
}
} catch (error) {
console.log('error occurred during search', error);
}
}
function handleValueError(error) {
console.log('error occurred on value', error);
}
discountFbRef
.orderByChild('discode')
.equalTo(code)
.on("value", handleValueSuccess, handleValueError);
answered Nov 22 '18 at 2:47
Matthew HerbstMatthew Herbst
10.6k134687
edited Nov 23 '18 at 17:50
answered Nov 22 '18 at 2:47
Matthew HerbstMatthew Herbst
10.6k134687
answered Nov 22 '18 at 2:47
Matthew HerbstMatthew Herbst
10.6k134687
answered Nov 22 '18 at 2:47
Matthew HerbstMatthew Herbst
10.6k134687
10.6k134687
I moved them to the call back function it didn't catch errors. I'm not sure how would it work because there is a console.log() inside the call back it doesn't log anything. May be I did something wrong could you show the code based on my code?
– Vamsiga
Nov 22 '18 at 4:42
@Vamsiga I edited my answer to show what I was thinking. Does that not work for you?
– Matthew Herbst
Nov 22 '18 at 4:51
1
Thanks it worked, I put try catch after the console.log() which is doing the snapshot.val().discode.
– Vamsiga
Nov 22 '18 at 5:00
add a comment |
I moved them to the call back function it didn't catch errors. I'm not sure how would it work because there is a console.log() inside the call back it doesn't log anything. May be I did something wrong could you show the code based on my code?
– Vamsiga
Nov 22 '18 at 4:42
@Vamsiga I edited my answer to show what I was thinking. Does that not work for you?
– Matthew Herbst
Nov 22 '18 at 4:51
1
Thanks it worked, I put try catch after the console.log() which is doing the snapshot.val().discode.
– Vamsiga
Nov 22 '18 at 5:00
I moved them to the call back function it didn't catch errors. I'm not sure how would it work because there is a console.log() inside the call back it doesn't log anything. May be I did something wrong could you show the code based on my code?
– Vamsiga
Nov 22 '18 at 4:42
I moved them to the call back function it didn't catch errors. I'm not sure how would it work because there is a console.log() inside the call back it doesn't log anything. May be I did something wrong could you show the code based on my code?
– Vamsiga
Nov 22 '18 at 4:42
@Vamsiga I edited my answer to show what I was thinking. Does that not work for you?
– Matthew Herbst
Nov 22 '18 at 4:51
@Vamsiga I edited my answer to show what I was thinking. Does that not work for you?
– Matthew Herbst
Nov 22 '18 at 4:51
1
1
Thanks it worked, I put try catch after the console.log() which is doing the snapshot.val().discode.
– Vamsiga
Nov 22 '18 at 5:00
Thanks it worked, I put try catch after the console.log() which is doing the snapshot.val().discode.
– Vamsiga
Nov 22 '18 at 5:00
add a comment |
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