I have a page in my app that shows outstanding defects for a user. I want a cypress to click on one of the rows, this takes you to a detail page.
I am able to select the table rows using
cy.get('[data-cy=faultsTable] tr').then(($tr)=>{
})
this correctly gets me 4 elements as expected. But I can't work out how to randomly choose one of them, as the .then wants to execute on each in turn.
I want to
a) get the defect id from
b) click the row.
Any suggestions will be gratefully received
There might be a better approach to this problem, but below is from my thought. If the number of defect Id records are less and are static, I mean from the table, you could probably pass those defect id into an array and return the defect id randomly.
Option:1
I have got a sample.js file in the /support folder where I have added the randomDefectId function.
module.exports ={
randomDefectId: function(){
var defect= ['10756', '10780', '19001', '21007', '25001', '27001'];
var item = defect[Math.floor(Math.random()*defect.length)];
return item;
}
}
Then I have import them into my test spec
var rand = require('../../support/sample.js');
Below is my test where I am receiving the rand.randomDefectId() into a const ranNumber
describe('Get the defect id', function(){
it('Check whether the defect id', function(){
const ranNumber = rand.getRandomNumber();
cy.visit('/');
console.log("Some number:"+ranNumber );
cy.get('#tableID>tbody>tr>td').contains(ranNumber).click()
// rest of the test step continues here...
})
})
Option:2
But if there are a large list of defect id inside the table, then you need a dynamic way to get the defect id, I haven't tried the below script, but you could give a try..
randomDefectId: function(){
let table = undefined;
Cypress.$("#tableID>tbody>tr").each(function() {
var newArr = Cypress.$(this).find("td:last-child").html();
table = newArr;
});
return table;
}
If there is better way of achieving this, I would like to know and share
I want to load all the items on start without showing any message, but once after loaded. I want to capture any new row in subscriber and show it to the desktop notification.
The problem is, I'm not sure how to check if all the previous items are loaded and if the row is new item or is it from previous existing item.
this.items = this.af.database.list('notifications/'+this.uid+'/');
this.items.subscribe(list => {
list.forEach(row => {
// doing something here...
});
// once all the rows are finished loading, then any new row, show desktop notification message
});
I have user lodash for the minimal code.
// this varible holds the initial loaded keys
let loadedKeys = [];
this.items = this.af.database.list('notifications/'+this.uid+'/');
this.items.subscribe((list)=>{
// we skip it while initial load
if(!_.isEmpty(loadedKeys)){
// different is the new keys
let newKeys = _.difference(_.map(list, "$key"), loadedKeys);
if(!_.isEmpty(newKeys)){
// ... notification code here
}
}
loadedKeys = _.map(list, "$key");
});
The behave you are looking for is the default Subject approach in RxJS.
Check this reactiveX url to follow the marble diagram of Publish Subject (the equivalent for Subject in RxJS).
So you have two easy options:
1) manually index witch rows you want to display like #bash replied
2) create a Rx.Subject() and assign only the newest's rows to it. Then you subscribe to this subject in your app workflow.
The advantage of method 2 is when a new .subscribe occur, it will not retrieve previous data.
Edit: I wrote this codepen as a guide to implement your custom RxJS Subject. Hope it helps.
Assuming your rows have something unique to match with previous rows you can do the following:
// A Row item has a unique identifier id
interface Row {
id: number;
}
this.rows: Row[];
this.items$ = this.af.database.list(`notifications/${this.uid}/`).pipe(
tap(list => {
// if rows is not array, first time...
if(!Array.isArray(this.rows)) {
// first time nothing to do
return;
}
// returns true if some item from list is not found in this.rows
const foundNewRow = list.some(item => {
return ! this.rows.find(row => row.id === item.id);
});
if (foundNewRow) {
// call method to show desktop message here
}
}
);
I used a pipe and a tap operator (that you will have to import). If you subscribe to this.items$ the tap operator will do the work:
this.items$.subscribe((items => this.rows = items));
If you do not want to set this.rows when normally subscribing than you can also do this in the tap operator. But that would assume you only use it for checking difference between existing and new items.
I have built a list using Meteor. I do not want the entire list to be reactive, i.e. auto-update when the data changes. However, I do want the title of a list item to update if the data relating to that list item changes. I am inserting the list items using Blaze.renderWithData, so how can I achieve this?
Use two helpers, a non-reactive one which returns the cursor and a reactive one which returns the title. To make something non-reactive, use Tracker.nonreactive, (related question).
In the following contrived example I'm returning a reactive title that includes the cursor count if non-zero while the cursor returned from the helper is non-reactive.
subHandle = Meteor.subscribe('mySubscription');
Template.foo.helpers({
cursor: function(){
if ( subHandle.ready() ) return Tracker.nonreactive(function() {
return myCollection.find(query,options);
});
}),
title: function(){
var nDocs = myCollection.find(query,options).count();
if ( nDocs ) return "Title (" + nDocs + ")";
else return "Title";
}
});
Update:
Modified to deal with the subscription handle being ready so that the nonreactive function is called for the first time with a ready subscription.
Here's a Meteorpad with a working example. You can see that the total points updates as you add points to players but the player scores and sort never change.
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 Vávra'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.
I need to implement Excel kind of filtering on a table on an aspx page.
What I want is, when I click on any column header it should show me the list of rows in that column with check-box for each one and when I select specific rows then the table should filter accordingly.
Here is a working example for one column at a time. I'm working on getting this working for several columns as well: http://jsfiddle.net/mwB37/20/
Since you're asking for a complete plugin with a UI and everything, including relevant code on SO is kinda difficult. But here are the key excerpts that defines my thinking and the concept:
// fetching the column index
var columnIndex = th.index();
// then fetching the corresponding TDs (use for-loop when thousands of elements)
var tds = th.closest('table')
.find('tbody td:nth-child(' + (columnIndex+1) + ')');
// distinctively selecting the unique text values in those columns
var checks = $.unique(tds.map(function() {
return $(this).text();
}).get());
// the most basic way possible of filtering
// (should be extended into an OR query of all current column filters)
if (index != -1 || arr.length == 0)
td.parent('tr').show();
else
td.parent('tr').hide();
If you want something already finished instead, this is such a plugin: PicNet Table Filter
There is also a filtering plugin available for the jQuery DataTables plugin, although sorting is obviously the main focus of that one.