Conditionally fire mergeMap, if false throw error
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}
this.activatedRoute.queryParamMap
.pipe(
map(params => {
return params.get('ID'))
}),
mergeMap(val => {
if(val)
return this.GetData(val)
.pipe(
map((res:any)=>{
return JSON.parse(res.data);
})
);
else
throwError(new Error('ID is missing'));
}),
).subscribe(x => {
console.log(x)
},
err => console.log(err)
);
What I am trying to do is fetch the ID querystring, if it exists then fires a get request else throw an error. I could do this inside the subscribe(), however doing that would I would have to nest it(subscribe inside a subscribe).
However when I try to throw an error I am getting this error: TypeError: "You provided 'undefined' where a stream was expected. You can provide an Observable, Promise, Array, or Iterable."
angular rxjs asked Nov 23 '18 at 11:27
j4reyj4rey
1,391925
add a comment |
this.activatedRoute.queryParamMap
.pipe(
map(params => {
return params.get('ID'))
}),
mergeMap(val => {
if(val)
return this.GetData(val)
.pipe(
map((res:any)=>{
return JSON.parse(res.data);
})
);
else
throwError(new Error('ID is missing'));
}),
).subscribe(x => {
console.log(x)
},
err => console.log(err)
);
What I am trying to do is fetch the ID querystring, if it exists then fires a get request else throw an error. I could do this inside the subscribe(), however doing that would I would have to nest it(subscribe inside a subscribe).
However when I try to throw an error I am getting this error: TypeError: "You provided 'undefined' where a stream was expected. You can provide an Observable, Promise, Array, or Iterable."
angular rxjs asked Nov 23 '18 at 11:27
j4reyj4rey
1,391925
Possibly duplicate of this.
– Kedar9444
Nov 23 '18 at 11:39
1
thanks, I fixed it......i had toreturn throwError(new Error('ID is missing'));
– j4rey
Nov 23 '18 at 12:05
add a comment |
this.activatedRoute.queryParamMap
.pipe(
map(params => {
return params.get('ID'))
}),
mergeMap(val => {
if(val)
return this.GetData(val)
.pipe(
map((res:any)=>{
return JSON.parse(res.data);
})
);
else
throwError(new Error('ID is missing'));
}),
).subscribe(x => {
console.log(x)
},
err => console.log(err)
);
What I am trying to do is fetch the ID querystring, if it exists then fires a get request else throw an error. I could do this inside the subscribe(), however doing that would I would have to nest it(subscribe inside a subscribe).
However when I try to throw an error I am getting this error: TypeError: "You provided 'undefined' where a stream was expected. You can provide an Observable, Promise, Array, or Iterable."
angular rxjs asked Nov 23 '18 at 11:27
j4reyj4rey
1,391925
this.activatedRoute.queryParamMap
.pipe(
map(params => {
return params.get('ID'))
}),
mergeMap(val => {
if(val)
return this.GetData(val)
.pipe(
map((res:any)=>{
return JSON.parse(res.data);
})
);
else
throwError(new Error('ID is missing'));
}),
).subscribe(x => {
console.log(x)
},
err => console.log(err)
);
What I am trying to do is fetch the ID querystring, if it exists then fires a get request else throw an error. I could do this inside the subscribe(), however doing that would I would have to nest it(subscribe inside a subscribe).
However when I try to throw an error I am getting this error: TypeError: "You provided 'undefined' where a stream was expected. You can provide an Observable, Promise, Array, or Iterable."
angular rxjs angular rxjs asked Nov 23 '18 at 11:27
j4reyj4rey
1,391925
asked Nov 23 '18 at 11:27
j4reyj4rey
1,391925
asked Nov 23 '18 at 11:27
j4reyj4rey
1,391925
asked Nov 23 '18 at 11:27
j4reyj4rey
1,391925
asked Nov 23 '18 at 11:27
j4reyj4rey
1,391925
1,391925
Possibly duplicate of this.
– Kedar9444
Nov 23 '18 at 11:39
1
thanks, I fixed it......i had toreturn throwError(new Error('ID is missing'));
– j4rey
Nov 23 '18 at 12:05
add a comment |
Possibly duplicate of this.
– Kedar9444
Nov 23 '18 at 11:39
1
thanks, I fixed it......i had toreturn throwError(new Error('ID is missing'));
– j4rey
Nov 23 '18 at 12:05
Possibly duplicate of this.
– Kedar9444
Nov 23 '18 at 11:39
Possibly duplicate of this.
– Kedar9444
Nov 23 '18 at 11:39
1
1
thanks, I fixed it......i had to
return throwError(new Error('ID is missing'));– j4rey
Nov 23 '18 at 12:05
thanks, I fixed it......i had to
return throwError(new Error('ID is missing'));– j4rey
Nov 23 '18 at 12:05
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53445858%2fconditionally-fire-mergemap-if-false-throw-error%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53445858%2fconditionally-fire-mergemap-if-false-throw-error%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Possibly duplicate of this.
– Kedar9444
Nov 23 '18 at 11:39
1
thanks, I fixed it......i had to
return throwError(new Error('ID is missing'));– j4rey
Nov 23 '18 at 12:05