I'm seeking some wisdom from the Angular community. I am working on a simple project using the MEAN stack. I have set up my back-end api and everything is working as expected. Using Postman, I observe expected behavior for both a GET and PUT routes to retrieve/update a single value - a high score - which is saved in it's own document in its own collection in a MongoDB. So far so good.
Where things go off track is when trying to access the PUT api endpoint from within Angular. Accessing the GET endpoint is no problem, and retrieving and displaying data works smoothly. However, after considerable reading and searching, I am stll unable to properly access the PUT endpoint and update the high score data when that event is triggered by gameplay. Below are the snippets of code that I believe to be relevant for reference.
BACK-END CODE:
SCHEMA:
const _scoreSchema = {
name: { type: String, required: true },
value: { type: Number, "default": 0 }
};
ROUTES:
router
.route('/api/score/:highScore')
.put(scoreController.setHighScore);
CONTROLLER:
static setHighScore(req, res) {
scoreDAO
.setHighScore(req.params.highScore)
.then(highScore => res.status(200).json(highScore))
.catch(error => res.status(400).json(error));
}
DAO:
scoreSchema.statics.setHighScore = (value) => {
return new Promise((resolve, reject) => {
score
.findOneAndUpdate(
{"name": "highScore"},
{$set: {"value": value} }
)
.exec(function(err, response) {
err ? reject(err)
: resolve(response);
});
});
}
ANGULAR CODE:
CONTROLLER:
private _updateHighScore(newHighScore): void {
console.log('score to be updated to:', newHighScore)
this._gameService
.updateHighScore(newHighScore);
}
SERVICE:
updateHighScore(newHighScore: Number): Observable<any> {
console.log(newHighScore);
let url = '/api/score/' + newHighScore;
let _scoreStringified = JSON.stringify({value: newHighScore});
let headers = new Headers();
headers.append("Content-Type", "application/json");
return this._http
.put(url , _scoreStringified, {headers})
.map((r) => r.json());
}
Note that the console.log(newHighScore) in the last block of code above correctly prints the value of the new high score to be updated, it's just not being written to the database.
The conceptual question with PUT routes in angular is this: If the api is already set up such that it receives all the information it needs to successfully update the database (via the route param) why is it required to supply all of this information again in the Angular .put() function? It seems like reinventing the wheel and not really utilizing the robust api endpoint that was already created. Said differently, before digging into the docs, I naively was expecting something like .put(url) to be all that was required to call the api, so what is the missing link in my logic?
Thanks!
Related
I hope you are doing well, I need some help regarding the Elasticsearch engine. what I am doing is I am trying to create a search engine I have successfully post my data through kibana to elasticsearch engine. but "but how can I add the search component of elastyicsearch to my react app", I have like 4 million records into the kibana index, when I try to search directly from react it take a long time to display records into my frontapp app with nodejs api. below is the code with nodejs but the problem with this code it just gives me 10 records only.
router.get('/tweets', (req, res)=>{
let query = {
index: 'tweets',
// size: 10000
}
if(req.query.tweets) query.q = `*${req.query.tweets}*`;
client.search(query)
.then(resp => {
return res.status(200).json({
tweets: resp.body.hits.hits
});
})
.catch(err=>{
console.log(err);
return res.status(500).json({
err
});
});
});
Is there any way to impliment elasticsearch component directly to my reactjs app. like with the localhost:9200/index.. directly from the elasticsearch api?
Your request to Elasticsearch looks a bit strange to me, have you tried to search using a body like in the documentation? This line:
if(req.query.tweets) query.q = `*${req.query.tweets}*`;
doesn't seem like a correct way to write a query. Which field do you want to search for?
I saw that you tried to use the size field, which should be correct. You can also try the following:
client.search({
index: 'tweets',
body: {
size: 1000, // You can put the size here to get more than 10 results
query: {
wildcard: { yourfield: `*${req.query.tweets}*` }
}
}
}, (err, result) => {
if (err) console.log(err)
})
You could use SearchKit to directly query elasticsearch from you react app. But be aware that exposing DB services outside of your own infrastructure is bad practice.
You can use the component like this:
import {
SearchkitManager,
SearchkitProvider,
SearchkitComponent
} from 'searchkit'
const searchkit = new SearchkitManager(host)
class Render extends SearchkitComponent {
render(){
let results = await this.searchkit.reloadSearch()
return <div>{results}</div>
}
}
function table(){
return <SearchkitProvider searchkit={searchkit}>
<Render />
</SearchkitProvider>
}
I have one query and one subscription, what I am trying to do is add my data to previous query so that it shows the full list.
I have one query which is returning me list of students and I am rendering that on UI like below
function Test(props) {
const { loading, data: dta } = useQuery(GETSTUDENTS);
const { data: d } = useSubscription(GETSUBSTUDENTS, {
onSubscriptionData: ({ subscriptionData: { data } }) => {
let fname = data.getSubStudent.fname;
let lname = data.getSubStudent.lname;
dta.getStudents.push({ fname, lname });
},
});
return (
<div className="">
{dta &&
dta.getStudents.map((li) => {
<div>
<p>{li.fname}</p>
<p>{li.lname}</p>
</div>;
})}
</div>
);
}
export default Test;
But the main issue is the above one is not updating the cache so when I change the routes and come bqack again it takes the previous data only.
So What I wnat to know na what is the best way to do this, I have check subscribeToMore also but did not get idea How to implement that and how it works with hooks.
I am getting some data from subscription and on that basis I want to change some other part so can I use refetchQueries I did not found any good tutorial which uses hooks (react-apollo-hooks) using qraphql
First, you can just use the pooling option of the useQuery instead of subscription,
I suggest you check it.
From Apollo docs:
"In the majority of cases, your client should not use subscriptions to
stay up to date with your backend. Instead, you should poll
intermittently with queries, or re-execute queries on demand when a
user performs a relevant action."
Apollo subscription
If you still want to use the subscription I think you should use the subscribeToMore and to update your cache policy inside the apollo cache file:
const cache = new InMemoryCache({
typePolicies: {
Agenda: {
fields: {
tasks: {
merge(existing = [], incoming: any[]) {
return [...existing, ...incoming];
},
},
},
},
},
});
You can read more about it here: merge cahce
And check that video: youtube apollo cache
I have code in Nodejs as backend and Angular as frontend.
I want to receive and send data by one endpoint and based on that data from server toggle a button. Toggling is working now but I want when I sign out from the dashboard next time that I log in I could see the value of the key is based on the value from the database.
For example, first, it's SET after clicking it changed to CLEAR and I sign out from the dashboard. When next time I log in I want to see the CLEAR label on my button.
These are codes for several parts of the app:
Angular Service
this.setUserFeatured = function(id, setFeatured) {
return $http.put('/admin/v2/users/' + id + '/featured', { setFeatured: setFeatured })
.then(returnedDataOrError);
};
Angular Controller
function updateFeaturedButtonLabel() {
$scope.featuredButtonLabel = $scope.user.setFeatured ? "Clear Featured" : "Set Featured";
}
function toggleFeatured () {
$scope.user.setFeatured = !$scope.user.setFeatured;
UserService.setUserFeatured($stateParams.id, $scope.user.setFeatured)
updateFeaturedButtonLabel();
};
Html File
<a class="btn btn-info" ng-click="toggleFeatured()" ng-class="{on:user.setFeatured}">{{featuredButtonLabel}}</a>
Server Controller
function addFeaturedUser(req: $Request, res: $Response, next: NextFunction) {
const schema = Joi.object().keys(_.pick(validate, ['userId', 'setFeatured']));
const queryParams = { userId: req.params.id };
if (!req.params.id) {
return new errors.BadRequest('userId is not specified');
}
return validate.validate(queryParams, schema)
.then(validatedParams =>
userService5.updateUserLabel(validatedParams.userId, req.body.setFeatured))
.then(result => res.json(result))
.catch(next);
}
router.put('/users/:id/featured', addFeaturedUser);
And updateUserLabel is a function that handling the connection to the database and retrieving the data.
I just wonder how can I use the data from the server to change the label of the button?
true/false for the setting the button is coming from the .then(result => res.json(result))
Thanks in advance for help
For your question, I suppose you are asking how to use the response object returned in
$http.put().then(function(response){})
You can find the structure of response object in following document.
https://docs.angularjs.org/api/ng/service/$http
To access the data returned from server:
$http.put().then(function(response){response.data})
which corresponds to what your server sends.
Besides, the toggleFeatured function should be add to $scope object.
Otherwise, ng-click can't trigger that function in html template.
Hope it helps.
Firstly, I am not a seasoned JS Developer, so please excuse obvious mistakes that I could have made.
I am trying to implement a custom Authenticator for authenticating a user with Keycloak using the OAuth2 Password Grant which requires the client_id be passed as part of the request body.
import OAuth2PasswordGrant from 'ember-simple-auth/authenticators/oauth2-password-grant';
export default OAuth2PasswordGrant.extend({
serverTokenEndpoint: 'http://localhost:8080/something/token',
makeRequest(url, data, headers = {}) {
data.client_id = 'my-app';
return this._super(url, data, headers);
}
});
I have a controller that uses this Authenticator by calling this action:
actions: {
authenticate() {
let {username, password} = this.getProperties('username', 'password');
this.get('session').authenticate('authenticator:oauth2', username, password).then(() => {
// Do something
}).catch((response) => {
// Show error
});
}
}
This causes Firefox to hang and gives me an unresponsive script message.
If I remove the return from the makeRequest() method, I can see from the browser debugger that the call to Keycloak actually returns correctly with the object that contains my token etc. However ember inspector shows some errors related to unresolved promises. But I guess that's because I'm no longer returning the promise.
What am I doing wrong here?
How can I fix the unresponsive script issue?
Is there another way for me to achieve my goal?
Edit 1: This is when I remove the return
Here is the actual object that is returned:
{
"access_token":"eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJTRUNSd09fMlZWdGhxUVBUWnFxNHlqX0tKekxnOElSTjBrQkx5UTlacklrIn0.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.eUJFklRiRjQPOC1rQLcqrljsSWmGXCpNNKqLJGAcvbnbwx8X0T1iqrmpFdyMN3EKRrIfTZyYRfcTEbpcBEjZcZtgDY9V0Ntvt4pvpUx_8Ey6I8xZQolHVwferjM30puLqG8MImADUimNrj3ghbJbAaCOJktIKgLnTIhDbkNb-8lzgbyq-rEP6lYAWjQ2OuOZnc8NQQ9CJiR9M1SB79SEmY2iQW9E_J8xo8BgZQ0GUBrhaWPo-Kn4RnlEcRNzVnlLHQKi5FM7Zpov3SMQUbAeLat38V41y09ap2XVCy7MfL_7-TrSlMx0TLrhWqPgA5aaXbmsT9_vKOoXNZoJ9bWCuA",
"expires_in":300,
"refresh_expires_in":1800,
"refresh_token":"eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJTRUNSd09fMlZWdGhxUVBUWnFxNHlqX0tKekxnOElSTjBrQkx5UTlacklrIn0.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.XgYSZWwfaHeY1yZZuwnQ5bj-0IHP4UEmiPTqaeCE1KVyjl3kZz3HJVisndtcKPr05kalS-M_NqU0TaYvbcZ_zesJRIga5sz4gGRqObUmUCUJoQ_iWoOhbM2SutiVnlfgJDACvOxegIcSvakZTgQsEcSweio_0kMFqi-2DYzFp6Rl0TpQ8vALLkc7rEOonUGyt7S4qQzkT-xB1_ZDlSVfm6mC-QKYNZhtqBT18P7MKxBhEgwrJtCytA_4ft7qNAbgvZ3kUohcbhzxGvtHej5RKHNI2wTzwK3IWHbkLWNndxSk_Lzj2-lCx380VpTkVpiDJfq5umjskOmI13dyPF7paA",
"token_type":"bearer",
"not-before-policy":0,
"session_state":"40831eaa-4f2a-496e-945d-7beb17e46e44"
}
This is what ember inspector (Promises) shows:
Here is the stacktrace from the Promise:
Ember Inspector ($E): authenticate/<#http://localhost:4200/assets/vendor.js:77927:9
initializePromise#http://localhost:4200/assets/vendor.js:63591:7
Promise#http://localhost:4200/assets/vendor.js:64067:35
authenticate#http://localhost:4200/assets/vendor.js:77919:14
authenticate#http://localhost:4200/assets/vendor.js:78528:14
authenticate#http://localhost:4200/assets/vendor.js:79420:14
authenticate#http://localhost:4200/assets/sfx-itransfer-web-agent.js:855:9
join#http://localhost:4200/assets/vendor.js:20249:24
run$1.join#http://localhost:4200/assets/vendor.js:37657:12
makeClosureAction/</<#http://localhost:4200/assets/vendor.js:29073:16
exports.flaggedInstrument#http://localhost:4200/assets/vendor.js:37087:14
makeClosureAction/<#http://localhost:4200/assets/vendor.js:29072:15
submit/<#http://localhost:4200/assets/vendor.js:70453:20
tryCatch#http://localhost:4200/assets/vendor.js:63549:14
invokeCallback#http://localhost:4200/assets/vendor.js:63562:15
publish#http://localhost:4200/assets/vendor.js:63532:9
#http://localhost:4200/assets/vendor.js:54458:16
invoke#http://localhost:4200/assets/vendor.js:19948:17
flush#http://localhost:4200/assets/vendor.js:19827:25
flush#http://localhost:4200/assets/vendor.js:20019:25
end#http://localhost:4200/assets/vendor.js:20128:26
run#http://localhost:4200/assets/vendor.js:20212:21
join#http://localhost:4200/assets/vendor.js:20219:24
run$1.join#http://localhost:4200/assets/vendor.js:37657:12
handleEvent/<#http://localhost:4200/assets/vendor.js:58233:18
exports.flaggedInstrument#http://localhost:4200/assets/vendor.js:37087:14
handleEvent#http://localhost:4200/assets/vendor.js:58232:17
_Mixin$create.handleEvent#http://localhost:4200/assets/vendor.js:57385:12
_bubbleEvent#http://localhost:4200/assets/vendor.js:57685:14
setupHandler/<#http://localhost:4200/assets/vendor.js:57619:20
dispatch#http://localhost:4200/assets/vendor.js:5546:16
add/elemData.handle#http://localhost:4200/assets/vendor.js:5355:6
Actually you solution looks like right.
I guess you have a problem in server response or mismatch request methods GET/POST. To solve this try to debug promise inside makeRequest.
return new RSVP.Promise((resolve, reject) => {
fetch(url, options).then((response) => {
response.text().then((text) => { //<-- here debug text
let json = text ? JSON.parse(text) : {};
if (!response.ok) { //<-- and here debug response
response.responseJSON = json;
reject(response);
} else {
resolve(json);
}
});
}).catch(reject);
So if problem will here, just rewrite whole method of makeRequest and add you own promise with custom fetch.
Another way is to write custom Authenticator, overriding authenticate, restore and (optionally) invalidate methods as wrote in documentation: https://github.com/simplabs/ember-simple-auth#implementing-a-custom-authenticator
Currently I have this, if with the full app it will create a post with my chosen parameters, however I am very new with vue.js, My aim is to be able to have a text file of such (or other way of storing (json etc)) the values, and then having the js script iterate through the file and display as cards, so for example in the file I would have
"Mark", "http://google.com", "5556", "image"
Or of course using json or similar, I'm up to what ever but my problem is, I don't know how to get values from a remote source and mirror it on to the document, can anyone help?, for clarity here's the snippet of code that I'm using
var app = new Vue({
el: '#app',
data: {
keyword: '',
postList: [
new Post(
'Name',
'Link',
'UID',
'Image'),
]
},
});
-- EDIT --
I'd like to thank the user Justin MacArthur for his quick answer, if you or anyone else doesn't mind answering another one of my painfully incompetent questions. This is the function that adds the cards in a nutshell
var Post = function Post(title, link, author, img) {
_classCallCheck(this, Post);
this.title = title;
this.link = link;
this.author = author;
this.img = img;
};
I can now get the data from the text file, meaning I could do, and assuming I have response defined (that being the http request) it'll output the contents of the file, how would I do this for multiple cards- as, as one would guess having a new URL for each variable in each set of four in each card is not just tedious but very inefficient.
new Post(
response.data,
)
The solution you're looking for is any of the AJAX libraries available. Vue used to promote vue-resource though it recently retired that support in favor of Axios
You can follow the instructions on the github page to install it in your app and the usage is very simple.
// Perform a Get on a file/route
axios.get(
'url.to.resource/path',
{
params: {
ID: 12345
}
}
).then(
// Successful response received
function (response) {
console.log(response);
}
).catch(
// Error returned by the server
function (error) {
console.log(error);
}
);
// Perform a Post on a file/route
// Posts don't need the 'params' object as the second argument is sent as the request body
axios.post(
'url.to.resource/path',
{
ID: 12345
}
).then(
// Successful response received
function (response) {
console.log(response);
}
).catch(
// Error returned by the server
function (error) {
console.log(error);
}
);
Obviously in the catch handler you'd have your error handing code, either an alert or message appearing on the page. In the success you could have something along the lines of this.postList.push(new Post(response.data.name, response.data.link, response.data.uid, response.data.image));
To make it even easier you can assign axios to the vue prototype like this:
Vue.prototype.$http = axios
and make use of it using the local vm instance
this.$http.post("url", { data }).then(...);
EDIT:
For your multi-signature function edit it's best to use the arguments keyword. In Javascript the engine defines an arguments array containing the parameters passed to the function.
var Post = function Post(title, link, author, img) {
_classCallCheck(this, Post);
if(arguments.length == 1) {
this.title = title.title;
this.link = title.link;
this.author = title.author;
this.img = title.img;
} else {
this.title = title;
this.link = link;
this.author = author;
this.img = img;
}
};
Be careful not to mutate the arguments list as it's a reference list to the parameters themselves so you can overwrite your variables easily without knowing it.