I have a Data Layer that is giving me information like this from Drupal
dataLayer = [{
"entityType":"node",
"entityBundle":"article",
"entityTaxonomy":
{"funnel_path":{"2":"Find a Park"},
"byline":{"4":"Name1","5":"Name2"}},"drupalLanguage":"en",
"userUid":"1"}
];
</script>
I can easily use GTM's Data Layer variable to pull in entityBundle. How do I set it to pull in the information in byline? I tried entityTaxonomy.byline, but that give me an array. I can set to do entityTaxonomy.byline.4 to get Name1, but that would be silly since the editors would be regularly adding things.
I am planning to add the byline, ultimately, into Custom Dimension 2 in Google Analytics.
I am looking to have the data that goes to Custom Dimension 2 to be Name1, Name2 . Sometimes this will be just one value. Sometimes it can be up to 20 values.
What do I need to do in GTM to get it to register that information?
entityTaxonomy.byline actually gives you an object. You would need to do a bit of processing to get an array that you can join into a string. One possible way would be
temp = [];
Object.keys(test.entityTaxonomy.byline).map(function(key, index) {
temp.push(test.entityTaxonomy.byline[key]);
});
bylines = temp.join(",")
(I'm sure that could be done much more concise). In GTM you would need to create a variable that contains the objects with the bylines, then you could do the processing in a custom javascript variable (which is by definition an anonymous function with a return value)
function() {
var byLineObject = {{bylines}} // created as datalayer var beforehand
temp = [];
Object.keys(byLineObject).map(function(key, index) {
temp.push(byLineObject[key]);
});
return temp.join(",")
}
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 thought it'd be easy but, yeah... it wasn't. I already posted a question that went in the same direction, but formulated another question.
What I want to do
I have the collection songs, that has a time attribute (the playing-time of the song). This attribute should be handled different in the form-validation and the backend-validation!
! I'd like to do it with what autoform (and simple-schema / collection2) offers me. If that's possible...
in the form the time should be entered and validated as a string that fits the regex /^\d{1,2}:?[0-5][0-9]$/ (so either format "mm:ss" or mmss).
in the database it should be stored as a Number
What I tried to do
1. The "formToDoc-way"
This is my javascript
// schema for collection
var schema = {
time: {
label: "Time (MM:SS)",
type: Number // !!!
},
// ...
};
SongsSchema = new SimpleSchema(schema);
Songs.attachSchema(SongsSchema);
// schema for form validation
schema.time.type = String // changing from Number to String!
schema.time.regEx = /^\d{1,2}:?[0-5][0-9]$/;
SongsSchemaForm = new SimpleSchema(schema);
And this is my template:
{{>quickForm
id="..."
type="insert"
collection="Songs"
schema="SongsSchemaForm"
}}
My desired workflow would be:
time is validated as a String using the schema
time is being converted to seconds (Number)
time is validated as a Number in the backend
song is stored
And the way back.
I first tried to use the hook formToDoc and converted the string into seconds (Number).
The Problem:
I found out, that the form validation via the given schema (for the form) takes place AFTER the conversion in `formToDoc, so it is a Number already and validation as a String fails.
That is why I looked for another hook that fires after the form is validated. That's why I tried...
2. The "before.insert-way"
I used the hook before.insert and the way to the database worked!
AutoForm.hooks({
formCreateSong: {
before: {
insert: function (doc) {
// converting the doc.time to Number (seconds)
// ...
return doc;
}
},
docToForm: function (doc) {
// convert the doc.time (Number) back to a string (MM:SS)
// ...
return doc;
}
}
});
The Problem:
When I implemented an update-form, the docToForm was not called so in the update-form was the numerical value (in seconds).
Questions:
How can I do the way back from the database to the form, so the conversion from seconds to a string MM:SS?
Is there a better way how to cope with this usecase (different data types in the form-validation and backend-validation)?
I am looking for a "meteor autoform" way of solving this.
Thank you alot for reading and hopefully a good answer ;-)
I feel like the time should really be formatted inside the view and not inside the model. So here's the Schema for time I'd use:
...
function convertTimeToSeconds (timeString) {
var timeSplit = timeString.split(':')
return (parseInt(timeSplit[0]) * 60 + parseInt(timeSplit[1]))
}
time: {
type: Number,
autoValue: function () {
if(!/^\d{1,2}:?[0-5][0-9]$/.test(this.value)) return false
return convertTimeToSeconds(this.value)
}
}
...
This has a small disadvantage of course. You can't use the quickForm-helper anymore, but will have to use autoForm.
To then display the value I'd simply find the songs and then write a helper:
Template.registerHelper('formateTime', function (seconds) {
var secondsMod = seconds % 60
return [(seconds - secondsMod) / 60, secondsMod].join(':')
})
In your template:
{{ formatTime time }}
The easy answer is don't validate the string, validate the number that the string is converted into.
With simpleschema, all you do is create a custom validation. That custom validation is going to grab the string, turn it into a number, and then validate that number.
Then, when you pull it from the database, you'll have to take that number & convert it into a string. Now, simpleschema doesn't do this natively, but it's easy enough to do in your form.
Now, if you wanted to get fancy, here's what I'd recommend:
Add new schema fields:
SimpleSchema.extendOptions({
userValue: Match.Optional(Function),
dbValue: Match.Optional(Function),
});
Then, add a function to your time field (stored as Date field):
userValue: function () {
return moment(this.value).format('mm:ss');
},
dbValue: function () {
return timeToNumber(this.value);
}
Then, make a function that converts a timeString to a number (quick and dirty example, you'll have to add error checking):
function timeToNumber(str) {
str.replace(':',''); //remove colon
var mins = +str.substr(0,2);
var secs = +str.substr(2,2);
return mins * 60 + secs;
}
Then, for real-time validation you can use schema.namedContext().validateOne. To update the db, just send timeToNumber(input.value).
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 send out a reminder email the DAY BEFORE a Calendar Event as well as the DAY AFTER. Unfortunately, I can't use Rules Scheduler, because the Tokens can't be manipulated with PHP. It doesn't work if I have
[node:field_event_date-datetime] -1 day
as the scheduled time.
What I've ended up doing is creating two "dummy" date fields for DAY BEFORE and DAY AFTER, and I'm trying to hook into the form, grabbing the event date, using some PHP like strtotime() to add/subtract a day, and make these the values that would go into the database.
I've tried linking to the #submit part of the form, but in phpMyAdmin, all values are NULL.
For this code i haven't even changed the date, I'm just trying to get values to appear in the database.
function mymodule_form_alter(&$form, &$form_state, $form_id) {
if ($form_id == "event_node_form") {
$form['#submit'][] = '_mymodule_after_build';
// Makes the fields invisible
$form["field_event_day_before"]["#access"] = FALSE;
$form["field_event_day_after"]["#access"] = FALSE;
}
}
function _mymodule_after_build($form, &$form_state) {
$eventcopy = array();
// copy the value part from the Event
$eventcopy = $form['field_event_date'][0]['#value'];
// without doing any PHP yet, simply copy the values. Doesn't show up in db.
$form['field_event_day_before'][0]['#value'] = $eventcopy;
dsm($form);
return $form;
}
I've read the tutorials about using Rules Scheduler with CCK and
I'm also following Schedule email to go out based on CCK date field - not working for me
Am I using the right hooks? How do I intercept the inputted date value properly?
I don't think you are approaching your problem the correct way. If you want to try to go down the path you are proposing then you would want to look at hook_nodeapi(). You can add some code for the 'insert' and/or 'save' (or maybe even 'presave') operations so you can update your $node->field_event_day_before'][0]['#value'] and $node->field_event_day_after'][0]['#value'] fields based on the event_date value.
However, you really don't want to add extra fields for date before and date after when you can just calculate those from the event_date.
What I think the better solution is to just implement hook_cron() and have that function handle querying for all events in your database whose event day is TODAY() +1. For all those results, send out an email. Do another query that looks for any event whose event_date is TODAY() - 1 and send out an email for those results. You'll want to make sure you only run this process once in every 24 hour period.
I want to share the answer, thanks to help from the community. If you run into this same problem, try this:
function mymodule_form_event_node_form_alter(&$form, &$form_state) {
// hide these dummy fields, will fill in programatically
$form["field_event_day_before"]["#access"] = FALSE;
$form["field_event_day_after"]["#access"] = FALSE;
}
function mymodule_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL){
switch ($op) {
//if the node is inserted in the database
case 'insert':
if($node->type == 'event') {
// Day before (+10 hours because I'm in Hawai`i, far from GMT)
$daybefore = strtotime('-1 day +10 hours', strtotime($node->field_event_date[0]['value']));
$daybefore = date('Y-m-j\TH:i:s', $daybefore);
$node->field_event_day_before[0]['value'] = $daybefore;
// Day after (+10 hours because I'm in Hawai`i)
$dayafter = strtotime('+1 day +10 hours', strtotime($node->field_event_date[0]['value']));
$dayafter = date('Y-m-j\TH:i:s', $dayafter);
$node->field_event_day_after[0]['value'] = $dayafter;
}
}
}
The rules scheduler can then take tokens from the day_before/day_after fields, and you can use their interface for scheduling.
You can do this by using the rules module, i did this in my one project, basically you have to create two rules, one for one day before, and another for one day after. Let me know if you want any clarification.
Thanks
K