I am testing some network packets of my Organisation's product. We already have custom plugins. I am trying to add some some more fields into those existing plugins (like conversion of 2 byte code to a string and assign it to a field)
Thankyou in advance for reading my query.
--edit
Wireshark version : 2.4.5 (organization's plugins dont work on latest wireshark application)
--edit
Problem statement:
I am able to add field and show value, but fieldname is not displayed as defined.
I cannot share the entire .lua file but i will try to explain What i did:
Below is the image where I have a field aprint.type. this is a two byte field. In .lua file, for display purpose it is appended with corresponding description using a custom function int_to_enum.
I want to add one more proto field aprint.typetext which will show the text.
What I did:
Added a protofield f_apr_msg_type_txt = ProtoField.string("aprint.typetxt","aprint_type_text") (Tried f_apr_msg_type_txt = ProtoField.string("aprint.typetxt","aprint_type_text",FT_STRING) also)
Below the code where subtree aprint.type is shown, added my required field as subtree:add(f_apr_msg_type_txt, msg_type_string) (Below is image of code extract)
I am able to see the text but field Name is shown as Wireshark Lua text (_ws.lua.text)
Normally displaying strings based on numeric values is accomplished by a value string lookup, so you'd have something like so:
local aprint_type_vals = {
[1] = "Foo",
[2] = "Bar",
[9] = "State alarm"
}
f_apr_msg_type = ProtoField.uint16("aprint.type", "Type", base.DEC, aprint_type_vals)
f_apr_msg_type_txt = ProtoField.string("aprint.typetxt","aprint_type_text", base.ASCII)
... then
local msg_type = tvb(offset, 2):le_uint()
subtree:add_le(f_apr_msg_type, tvb(offset, 2))
subtree:add(f_apr_msg_type_txt, tvb(offset, 2), (aprint_type_vals[msg_type] or "Unknown"))
--[[
Alternatively:
subtree:add(f_apr_msg_type_txt, tvb(offset, 2)):set_text("aprint_type_text: " .. (aprint_type_vals[msg_type] or "Unknown"))
--]]
I'm also not sure why you need the extra field with only the text when the text is already displayed with the existing field, but that's basically how you'd do it.
I have points from my Input like these two:
http,Location=Foo Key="Humidity",Value=68 1659704523000000000
http,Location=Foo Key="Temperature",Value=24,1 1659704523000000000
But I have to store them like these:
http,Location=Foo Humidity=68 1659704523000000000
http,Location=Foo Temperature=24,1 1659704523000000000
I saw almost all of Processor plugin docs, but I still not sure it is possible to use field value as a field name. Isn't it?
I still not sure it is possible to use field value as a field name. Isn't it?
Yep! The starlark processor will do this. The 'pivot' example is what you are after.
The following will create a new field based on the values of Key and Value and then remove the original values:
[[processors.starlark]]
source = '''
def apply(metric):
metric.fields[str(metric.fields['Key'])] = metric.fields['Value']
metric.fields.pop('Key',None)
metric.fields.pop('Value',None)
return metric
'''
I created a custom function for google spreadsheets. All it does is return a random letter. The function works great when I first enter it into a cell. But now I want to be able to "recalculate" the function using a keyboard shortcut; I'd also be willing to refresh the page if needed.
TLDR: I want to be able to hit a key and have my custom functions recalculate.
How can I accomplish this?
Edit to add:
Here is the code for my function.
//returns a random letter suitable for use in function notation
function ranFunLet() {
var letters = ['a','b','c','d','f','g','h','j','k','m','n','p','q','r','s','t','u','v','w','x','y','z']
var letter = letters[Math.floor(Math.random()*letters.length)];
//console.log(letter);
return letter;
}
I would like the cell I use it in to run the function again when I press a button (or refresh the page).
Suggestion
The Apps Script editor does support keyboard shortcut trigger as per this existing answer. However, you may want to try Importing functions as macros, then you can assign a unique keyboard shortcut to it.
Here's a sample
Sample Sheet
Sample script function to test
This sample script function increments the number on A1 cell.
function sample() {
var data = SpreadsheetApp.getActive().getActiveSheet().getRange("A1").getValue();
var res = data+1;
SpreadsheetApp.getActive().getActiveSheet().getRange("A1").setValue(res);
}
Import the function on your spreadsheet (in my testing it is named as sample):
In the Google Sheets UI, select Tools > Macros > Import.
Select a function form the list presented and then click Add
function.
Select clear to close the dialog.
Select Tools > Macros > Manage macros.
Locate the function you just imported in the list. Assign a unique
keyboard shortcut to the macro. You can also change the macro name
here; the name defaults to the name of the function.
Click Update to save the macro configuration.
Result
After pressing the sample shortcut key Ctrl + Alt + Shift + 2, the function incremented the number on A1 cell from 1 to 2:
NOTE: You can not choose a specific shortcut & if you'll edit your function on the Apps Script editor, you would need to re-import your function again as a macro.
the button solution is done like this:
https://www.youtube.com/watch?v=yaBMsSpAxYM
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 have a combo box that I am trying to add options to. How Do I go about this? This is what I have so far:
ComboBox contactPrefixNametf = new ComboBox("Prefix");
contactPrefixNametf.setItemCaption(contactPrefixNametf, "Mr");
fLayout.addComponent(contactPrefixNametf);
contactPrefixNametf.setImmediate(true);
I guess .setItemCaption() is not the correct method? What is the correct method?
Thank you in advance!
Use addItem() method:
final ComboBox my_combox_box = new ComboBox("My Combo Box");
for (final My_object mo: list_of_my_objects)
{
my_combox_box.addItem(mo);
my_combox_box.setItemCaption(mo, mo.name());
}
This example uses addItem inconjunction with setItemCaption() to store the actual object selected by the user with a display friendly name (if toString() is not appropriate).
myComboBox.addItem("Option 1");
(Especially if you are new to Vaadin), I suggest to try Viritin add-on and its TypedSelect variant of ComboBox. Its well typed API makes many things ridiculously simpler. For instance it has a (typed) setOptions method and its value change listeners provide the value directly instead of through untyped Property interface.
A code example of its usage:
List<Person> options = service.findMyPersons();
TypedSelect<Person> select = new TypedSelect<>(Person.class)
.withSelectType(ComboBox.class);
select.setOptions(options);
// If toString() representation is not good, modify it to something else
select.setCaptionGenerator(person -> person.getFirstName() + person.getLastName());
select.addMValueChangeListener(event -> {
Person person = event.getValue();
});
Disclaimer: I'm the maintainer of Viritin, but also have maintained Vaadin for 8 years and nowadays work as its developer advocate.