I have an apple watch complication and the iPhone app running side by side. I have a button within the app to transmit application context dictionary to the watch. I expect to see the complication title to be refreshed.
I cannot seem to force the "tap button -> see update on the complication" kind of behavior.
What is the appropriate method to force a complication update? How can I refresh my apple watch complication instantly?
I do see the title changes, but I think it requires me to tap on the complication to open it's apple watch app first. How can I get the complication to update itself on the Watch home screen?
func getCurrentTimelineEntry(for complication: CLKComplication, withHandler handler: #escaping (CLKComplicationTimelineEntry?) -> Void) {
if complication.family == .graphicRectangular {
let template = CLKComplicationTemplateGraphicRectangularLargeImage()
//...configure
return template
}
}
I see this apple provided code that refreshes the complication. I'm not sure if it is too much, or if calling extendTimeline alone is sufficient if I'm generating the complication using the entry above.
func refreshComplication() {
#if os(watchOS)
let server = CLKComplicationServer.sharedInstance()
if let complications = server.activeComplications {
for complication in complications {
// Call this method sparingly. If your existing complication data is still valid,
// consider calling the extendTimeline(for:) method instead.
server.reloadTimeline(for: complication)
}
}
#endif
}
You should be able to do this by calling the refreshComplication() function from your didReceiveApplicationContext block in the file which has your WCSessionDelegate.
So if you are receiving the title via an applicationContext message your code would look something along these lines.
func session(_ session: WCSession, didReceiveApplicationContext applicationContext: [String : Any]) {
if let updatedTitle = applicationContext["updatedTitle"] {
if let title = updateTitle as? String {
//Remeber that complicationServer.swift is a seperate process therefore you will need to store the received data somehow.
UserDefaults.standard.set(title, forKey: "complicationTitle")
refreshComplication()
}
}
}
I have a setting in my iOS App that lets the user change their target and using this method refreshed the complication with the new target almost instantly. However, I believe once your complication has used up its cpu budget nothing will happen, but hopefully that is not happening for you. See https://developer.apple.com/documentation/clockkit/clkcomplicationserver/1627891-reloadtimeline
Hope that helps, let me know how you get on.
Drew
When trying out google cloud vision with the drag and drop Try Drag and Drop, the last tab has raw JSON. What parameter do we need to pass to get that data?
I'm currently doing DOCUMENT_TEXT_DETECTION but it only gives data at the level of words and not of individual characters.
Edit: I modified this code vision test and changed the feature ...
feature := &vision.Feature{
Type: "DOCUMENT_TEXT_DETECTION",
}
and the printing to ...
body, err := json.Marshal(res)
fmt.Println(string(body))
I'm only seeing textAnnotations in the output.
The JSON file contains different things like text, locations and etc etc, Your concern is about getting full text.
Here I am adding a Python code, it says that you can get the full text by rendering the JSON file, you will find your required result using data['fullTextAnnotation']['text'], and you can get characters by breaking this file into smaller chunks and I guess JSON file has individual characters in it but I have never worked on it.
import json
from pprint import pprint
data = json.load(open('File Path'))
pprint(data['fullTextAnnotation']['text'])
Well, if you check properly there are various things available in that last tab containing raw JSON.
Based on your requirements you can fetch any of them.
From the response that you get from DOCUMENT_TEXT_DETECTION, you can fetch text_annotations, full_text_annotations, etc.
From text_annotations, you can fetch description, language of entire text, each words of texts, numeric digits, special characters and their respective co-ordinates.
From full_text_annotations, you can fetch pages, blocks of data, paragraphs, and individual characters, with their respective co-ordinates and confidence score.
Using the same code template you are using in Go language:
Search âtype Feature structâ in the browser in this page. You can see the following feature types and descriptions:
// Type: The feature type.
//
// Possible values:
// "TYPE_UNSPECIFIED" - Unspecified feature type.
// "FACE_DETECTION" - Run face detection.
// "LANDMARK_DETECTION" - Run landmark detection.
// "LOGO_DETECTION" - Run logo detection.
// "LABEL_DETECTION" - Run label detection.
// "TEXT_DETECTION" - Run text detection / optical character
// recognition (OCR). Text detection
// is optimized for areas of text within a larger image; if the image
// is
// a document, use `DOCUMENT_TEXT_DETECTION` instead.
// "DOCUMENT_TEXT_DETECTION" - Run dense text document OCR. Takes
// precedence when both
// `DOCUMENT_TEXT_DETECTION` and `TEXT_DETECTION` are present.
// "SAFE_SEARCH_DETECTION" - Run Safe Search to detect potentially
// unsafe
// or undesirable content.
// "IMAGE_PROPERTIES" - Compute a set of image properties, such as
// the
// image's dominant colors.
// "CROP_HINTS" - Run crop hints.
// "WEB_DETECTION" - Run web detection.
There is not an option to directly show the JSON tab contents. The JSON tab contents are the addition of all the tabs âoutputâ. Users tend to ask just for one. For example, when someone is analyzing faces is not interested in text detection.
If you need more than one, you can obtain multiple features outputs by âaddingâ the result of all the possible values together. Based on the facts mentioned, I have added the following lines to your code:
feature2 := &vision.Feature{
Type: "LABEL_DETECTION",
MaxResults: 10,
}
req2 := &vision.AnnotateImageRequest{
Image: img,
Features: []*vision.Feature{feature2},
}
batch2 := &vision.BatchAnnotateImagesRequest{
Requests: []*vision.AnnotateImageRequest{req2},
}
res2, err := svc.Images.Annotate(batch2).Do()
if err != nil {
log.Fatal(err)
}
body2, err := json.Marshal(res2)
fmt.Println(string(body2))
I have tested it and works. You should add this block of code for all the features in which you are interested. If you intend to add many of them, I would suggest to create a function/loop to avoid repeating code.
Anyway, I suggest you to fulfill the request here in order to exactly obtain the JSON output (that gives data at the level of words or letters) through calling the API instead of using a client library. I have used the next code to obtain the bounding box for the numbers of my interest:
{
"requests":
[
{
"features":
[
{
"type":
""
"maxResults":
-- add a property --model
}
{
"type":
""
-- add a property --maxResultsmodel
}
]
"image":
{
"source":
{
"gcsImageUri":
""
-- add a property --imageUri
}
-- add a property --content
}
-- add a property --imageContext
}
]
-- add a property --
}
We've been using SCORM in our previous e-learning 'engine' but we want to change the elements our Managed Learning Environment (MLE) tracks, namely each completable component in an e-learning module.
At runtime, we run the following code to set up our SCORM connection:
var vault = {}; //vault 'namespace' helps ensure no conflicts with possible other "SCORM" variables
vault.UTILS = {}; //For holding UTILS functions
vault.debug = { isActive: true }; //Enable (true) or disable (false) for debug mode
vault.SCORM = { //Define the SCORM object
version: null, //Store SCORM version.
handleCompletionStatus: true, //Whether or not the wrapper should automatically handle the initial completion status
handleExitMode: true, //Whether or not the wrapper should automatically handle the exit mode
API:{handle: null, isFound: false}, //Create API child object
connection: { isActive: false }, //Create connection child object
data: { completionStatus: null, exitStatus: null}, //Create data child object
debug:{} //Create debug child object
};
vault.SCORM.API.find('win');
vault.SCORM.connection.initialize();
if (vault.SCORM.data.get("cmi.core.lesson_status")=="not attempted") {
vault.SCORM.data.set("cmi.core.lesson_status" , "incomplete");
vault.SCORM.data.save();
}
There are many more functions in the SCORM.js file, but the point is this all works; When the module is loaded into our MLE, the following code triggers course completion:
vault.SCORM.data.set("cmi.core.lesson_status" , "completed");
So how would we register a completable component with SCORM? (Components in our 'engine' are jQuery objects usually called 'element'). Would something like the following work, or are custom calls in SCORM not possible?
vault.SCORM.data.set("cmi.interactions.n."+element.componentId() , "incomplete");
But then if I registered an interaction by specifying an id, as follows...
vault.SCORM.data.set("cmi.interactions.n.id", element.componentId());
...how do I then set or access 'completion' on that component?
I've been reading posts and pdf specs from various sites, but the explanations are sparse at best.
I know there aren't a lot of SCORM followers here, but if you have any info, I'd be keen to hear it.
FWIW, that's my pipwerks SCORM wrapper, but with the variable pipwerks changed to ncalt.
There is documentation on how to use my wrapper at http://pipwerks.com (search for "scorm wrapper" in the search field). The original source code can be found at https://github.com/pipwerks/scorm-api-wrapper.
Note your sample code is not using the wrapper the way it was intended to be used. For example, this:
ncalt.SCORM.data.set("cmi.core.lesson_status" , "completed");
should be this (data is an internal helper and not necessary):
ncalt.SCORM.set("cmi.core.lesson_status" , "completed");
You can shorten it even further via a reference variable, like so:
var scorm = ncalt.SCORM;
scorm.set("cmi.core.lesson_status" , "completed");
scorm.save();
scorm.get("cmi.core.lesson_status"); //returns "completed"
As for your 'components', if you'd like to use SCORM's cmi.interactions model, be sure you're using the correct syntax. The "n" in the SCORM documentation (cmi.interactions.n.id) is meant to represent a number, it's not a literal "n".
scorm.set("cmi.interactions.0.id", "myfirstinteraction");
scorm.save();
To retrieve data from that interaction, you need to specify the number in place of the n:
scorm.get("cmi.interactions.0.id"); //returns "myfirstinteraction"
Note the CMI data model doesn't provide a 'status' field for cmi.interactions. You'd need to use cmi.objectives.
scorm.set("cmi.objectives.0.status", "completed");
scorm.save();
scorm.get("cmi.objectives.0.status"); // returns "completed"
The CMI data model (as available in SCORM) is spelled out here: http://scorm.com/scorm-explained/technical-scorm/run-time/run-time-reference/
How can we re-create template while switching routes?
For example, i have subscriber template. It detects when user scrolls down to a display and subscribes to more data. It takes several parameters.
Example:
amazing_page.html
{{#each}}
{{amazing_topic}}
{{/each}}
{{>subscriber name='topics' count=5}}
subscriber.js
//rough sample code
Template.subscriber.onCreated(function() {
var self = this;
var type = Template.currentData().name;
var count = Template.currentData().count;
var user = Template.currentData().user;
var skipCount = 0;
self.autorun(function(c){
self.subscribe(type, skipCount, user);
var block = true;
$(window).scroll(function() {
if (($(window).scrollTop() + $(window).height()) >= ($(document).height()) && block) {
block = false;
skipCount = skipCount + count;
console.log(type);
console.log(skipCount);
self.subscribe(type, skipCount, user, {
onReady: function() {
block = true;
},
onStop: function() {
console.log('stopped');
}
});
}
});
})
});
I use this template with different parameters in different routes.
The problem is if user switches some routes, and scrolls down in one page, all subscribers he gets in another pages will actualy work in this page. More, they will store increased values for them variables, and will do all included logic.
I found a bad decision when we use Route.getName (for example) comparing and name parameter of subscriber. It is not a best option. Can someone help me to find a good practice for that?:)
Simple Example:
We have 3 different routes:
1)News
2)Videos
3)Topics
These routes templates have included special subscriber-templates. And subscribtion works fine on scroll.
Ok, now let's visit all of them: News, Videos, Topics.
Good, now scroll down and... I have three instance of subscriber template what will subscribe on them own publications, because they not destroyed when we switch routes.
And, as a result - when user scrolling Topics page, he will call subscribtion for News and Videos too, and he will take data from these collections too;)
And - this is a problem:)
UPD:
Looks like we find a decision. If i use Template.instance (autorun/subscribe) it will start working expected, except some strange cases:)
First of all, when i go in another route in next iteration (scroll down) it returns me data from old, destroyed template + error. Next time (next iteration) it will start to subscribe to a correct data. Hmm...it looks like i have mistake in autorun section...or not?
Attached print screen from console
this
It sounds like you have multiple subscriptions to the same collection and that therefore the list of documents shown in various contexts can change in unexpected ways. Meteor manages multiple subscriptions on the same collection by synchronizing the union of the selected documents.
The simplest way to manage each of your views is to make sure that the data context for a particular view uses a .find() with the query you need. This will typically be the same query that your publication is using.
A different but less efficient approach is to .stop() the subscription when you leave a view.
I'm trying to test out Firebase to allow users to post comments using push. I want to display the data I retrieve with the following;
fbl.child('sell').limit(20).on("value", function(fbdata) {
// handle data display here
}
The problem is the data is returned in order of oldest to newest - I want it in reversed order. Can Firebase do this?
Since this answer was written, Firebase has added a feature that allows ordering by any child or by value. So there are now four ways to order data: by key, by value, by priority, or by the value of any named child. See this blog post that introduces the new ordering capabilities.
The basic approaches remain the same though:
1. Add a child property with the inverted timestamp and then order on that.
2. Read the children in ascending order and then invert them on the client.
Firebase supports retrieving child nodes of a collection in two ways:
by name
by priority
What you're getting now is by name, which happens to be chronological. That's no coincidence btw: when you push an item into a collection, the name is generated to ensure the children are ordered in this way. To quote the Firebase documentation for push:
The unique name generated by push() is prefixed with a client-generated timestamp so that the resulting list will be chronologically-sorted.
The Firebase guide on ordered data has this to say on the topic:
How Data is Ordered
By default, children at a Firebase node are sorted lexicographically by name. Using push() can generate child names that naturally sort chronologically, but many applications require their data to be sorted in other ways. Firebase lets developers specify the ordering of items in a list by specifying a custom priority for each item.
The simplest way to get the behavior you want is to also specify an always-decreasing priority when you add the item:
var ref = new Firebase('https://your.firebaseio.com/sell');
var item = ref.push();
item.setWithPriority(yourObject, 0 - Date.now());
Update
You'll also have to retrieve the children differently:
fbl.child('sell').startAt().limitToLast(20).on('child_added', function(fbdata) {
console.log(fbdata.exportVal());
})
In my test using on('child_added' ensures that the last few children added are returned in reverse chronological order. Using on('value' on the other hand, returns them in the order of their name.
Be sure to read the section "Reading ordered data", which explains the usage of the child_* events to retrieve (ordered) children.
A bin to demonstrate this: http://jsbin.com/nonawe/3/watch?js,console
Since firebase 2.0.x you can use limitLast() to achieve that:
fbl.child('sell').orderByValue().limitLast(20).on("value", function(fbdataSnapshot) {
// fbdataSnapshot is returned in the ascending order
// you will still need to order these 20 items in
// in a descending order
}
Here's a link to the announcement: More querying capabilities in Firebase
To augment Frank's answer, it's also possible to grab the most recent records--even if you haven't bothered to order them using priorities--by simply using endAt().limit(x) like this demo:
var fb = new Firebase(URL);
// listen for all changes and update
fb.endAt().limit(100).on('value', update);
// print the output of our array
function update(snap) {
var list = [];
snap.forEach(function(ss) {
var data = ss.val();
data['.priority'] = ss.getPriority();
data['.name'] = ss.name();
list.unshift(data);
});
// print/process the results...
}
Note that this is quite performant even up to perhaps a thousand records (assuming the payloads are small). For more robust usages, Frank's answer is authoritative and much more scalable.
This brute force can also be optimized to work with bigger data or more records by doing things like monitoring child_added/child_removed/child_moved events in lieu of value, and using a debounce to apply DOM updates in bulk instead of individually.
DOM updates, naturally, are a stinker regardless of the approach, once you get into the hundreds of elements, so the debounce approach (or a React.js solution, which is essentially an uber debounce) is a great tool to have.
There is really no way but seems we have the recyclerview we can have this
query=mCommentsReference.orderByChild("date_added");
query.keepSynced(true);
// Initialize Views
mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
mManager = new LinearLayoutManager(getContext());
// mManager.setReverseLayout(false);
mManager.setReverseLayout(true);
mManager.setStackFromEnd(true);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(mManager);
I have a date variable (long) and wanted to keep the newest items on top of the list. So what I did was:
Add a new long field 'dateInverse'
Add a new method called 'getDateInverse', which just returns: Long.MAX_VALUE - date;
Create my query with: .orderByChild("dateInverse")
Presto! :p
You are searching limitTolast(Int x) .This will give you the last "x" higher elements of your database (they are in ascending order) but they are the "x" higher elements
if you got in your database {10,300,150,240,2,24,220}
this method:
myFirebaseRef.orderByChild("highScore").limitToLast(4)
will retrive you : {150,220,240,300}
In Android there is a way to actually reverse the data in an Arraylist of objects through the Adapter. In my case I could not use the LayoutManager to reverse the results in descending order since I was using a horizontal Recyclerview to display the data. Setting the following parameters to the recyclerview messed up my UI experience:
llManager.setReverseLayout(true);
llManager.setStackFromEnd(true);
The only working way I found around this was through the BindViewHolder method of the RecyclerView adapter:
#Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
final SuperPost superPost = superList.get(getItemCount() - position - 1);
}
Hope this answer will help all the devs out there who are struggling with this issue in Firebase.
Firebase: How to display a thread of items in reverse order with a limit for each request and an indicator for a "load more" button.
This will get the last 10 items of the list
FBRef.child("childName")
.limitToLast(loadMoreLimit) // loadMoreLimit = 10 for example
This will get the last 10 items. Grab the id of the last record in the list and save for the load more functionality. Next, convert the collection of objects into and an array and do a list.reverse().
LOAD MORE Functionality: The next call will do two things, it will get the next sequence of list items based on the reference id from the first request and give you an indicator if you need to display the "load more" button.
this.FBRef
.child("childName")
.endAt(null, lastThreadId) // Get this from the previous step
.limitToLast(loadMoreLimit+2)
You will need to strip the first and last item of this object collection. The first item is the reference to get this list. The last item is an indicator for the show more button.
I have a bunch of other logic that will keep everything clean. You will need to add this code only for the load more functionality.
list = snapObjectAsArray; // The list is an array from snapObject
lastItemId = key; // get the first key of the list
if (list.length < loadMoreLimit+1) {
lastItemId = false;
}
if (list.length > loadMoreLimit+1) {
list.pop();
}
if (list.length > loadMoreLimit) {
list.shift();
}
// Return the list.reverse() and lastItemId
// If lastItemId is an ID, it will be used for the next reference and a flag to show the "load more" button.
}
I'm using ReactFire for easy Firebase integration.
Basically, it helps me storing the datas into the component state, as an array. Then, all I have to use is the reverse() function (read more)
Here is how I achieve this :
import React, { Component, PropTypes } from 'react';
import ReactMixin from 'react-mixin';
import ReactFireMixin from 'reactfire';
import Firebase from '../../../utils/firebaseUtils'; // Firebase.initializeApp(config);
#ReactMixin.decorate(ReactFireMixin)
export default class Add extends Component {
constructor(args) {
super(args);
this.state = {
articles: []
};
}
componentWillMount() {
let ref = Firebase.database().ref('articles').orderByChild('insertDate').limitToLast(10);
this.bindAsArray(ref, 'articles'); // bind retrieved data to this.state.articles
}
render() {
return (
<div>
{
this.state.articles.reverse().map(function(article) {
return <div>{article.title}</div>
})
}
</div>
);
}
}
There is a better way. You should order by negative server timestamp. How to get negative server timestamp even offline? There is an hidden field which helps. Related snippet from documentation:
var offsetRef = new Firebase("https://<YOUR-FIREBASE-APP>.firebaseio.com/.info/serverTimeOffset");
offsetRef.on("value", function(snap) {
var offset = snap.val();
var estimatedServerTimeMs = new Date().getTime() + offset;
});
To add to Dave VĂĄvra's answer, I use a negative timestamp as my sort_key like so
Setting
const timestamp = new Date().getTime();
const data = {
name: 'John Doe',
city: 'New York',
sort_key: timestamp * -1 // Gets the negative value of the timestamp
}
Getting
const ref = firebase.database().ref('business-images').child(id);
const query = ref.orderByChild('sort_key');
return $firebaseArray(query); // AngularFire function
This fetches all objects from newest to oldest. You can also $indexOn the sortKey to make it run even faster
I had this problem too, I found a very simple solution to this that doesn't involved manipulating the data in anyway. If you are rending the result to the DOM, in a list of some sort. You can use flexbox and setup a class to reverse the elements in their container.
.reverse {
display: flex;
flex-direction: column-reverse;
}
myarray.reverse(); or this.myitems = items.map(item => item).reverse();
I did this by prepend.
query.orderByChild('sell').limitToLast(4).on("value", function(snapshot){
snapshot.forEach(function (childSnapshot) {
// PREPEND
});
});
Someone has pointed out that there are 2 ways to do this:
Manipulate the data client-side
Make a query that will order the data
The easiest way that I have found to do this is to use option 1, but through a LinkedList. I just append each of the objects to the front of the stack. It is flexible enough to still allow the list to be used in a ListView or RecyclerView. This way even though they come in order oldest to newest, you can still view, or retrieve, newest to oldest.
You can add a column named orderColumn where you save time as
Long refrenceTime = "large future time";
Long currentTime = "currentTime";
Long order = refrenceTime - currentTime;
now save Long order in column named orderColumn and when you retrieve data
as orderBy(orderColumn) you will get what you need.
just use reverse() on the array , suppose if you are storing the values to an array items[] then do a this.items.reverse()
ref.subscribe(snapshots => {
this.loading.dismiss();
this.items = [];
snapshots.forEach(snapshot => {
this.items.push(snapshot);
});
**this.items.reverse();**
},
For me it was limitToLast that worked. I also found out that limitLast is NOT a function:)
const query = messagesRef.orderBy('createdAt', 'asc').limitToLast(25);
The above is what worked for me.
PRINT in reverse order
Let's think outside the box... If your information will be printed directly into user's screen (without any content that needs to be modified in a consecutive order, like a sum or something), simply print from bottom to top.
So, instead of inserting each new block of content to the end of the print space (A += B), add that block to the beginning (A = B+A).
If you'll include the elements as a consecutive ordered list, the DOM can put the numbers for you if you insert each element as a List Item (<li>) inside an Ordered Lists (<ol>).
This way you save space from your database, avoiding unnecesary reversed data.