N3.js | Lightning fast , spec-compatible , streaming RDF | JSON Processing library
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Lightning fast, spec-compatible, streaming RDF for JavaScript
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QUESTION
good evening. I wanna create a mask for my JavaScript project, using only Pure JavaScript, without any jQuery stuff or anything like that. What a want to do is, while I'm writing a bunch of numbers, they will be placed in certain spots. Like, for the final format, I want to do "XXX.XXX.XXX-XX", but, while writing, "XXX." and then "XXX.XXX.", like that. Right now, my code is:
...ANSWER
Answered 2021-May-11 at 04:08\w matches any single letter, number or underscore (same as [a-zA-Z0-9_]). You can customize and add only
numbersandalphabetsusing/[a-zA-Z0-9]/ginmatchfunction.
Intentionally I've used the condition e.key !== "Backspace" && e.key !== "Delete" to not add the characters in input if user use delete or Backspace key.
QUESTION
I'm completely new to web development and javascript, (but i have a basic understanding of programming) i want to create a bunch of buttons that have different colors, and give the user the ability to click on a button to choose a color and then go fill a region (path) in a an svg image, my problem is that i create a variable that takes the value of the color when clicking on the button and i use it to color the path on the svg image and when ever i choose a different color from the buttons the color changes in the svg image without clicking on it. I want to be able to keep the previous color on the svg image until i click again on it to change. Please somebody help and sorry for the long message. This is HTML
...ANSWER
Answered 2020-Dec-01 at 10:29The three classes selected1, selected2 and selected3 are all set to the same thing:
QUESTION
I just upgraded my react app to include the newest react router v5.2 in order to get the useHistory hook. Things worked fine until I restarted for the first time next morning. Now when I use f5 to start a debugging session I get an exception in a node-modules file named json3. (BTW, the app runs okay in the browser after yarn start.) The exception is "SyntaxError: Unexpected token in JSON at position 1". The code is line 186 in json3.js:
...ANSWER
Answered 2020-Sep-05 at 01:47Because of the conflicts I caused by upgrading my node_modules without regard to breaking changes (dumb I know), I was only able to fix this problem by starting over. I made another create-react-app, copied my package.json (with the corrected version numbers), ran yarn install, then copied over all my program data: src, .vscode, .eslintrc, etc, etc. With a few easy fixes, this worked. No exceptions deep in the node_modules.
QUESTION
I wrote a function. I used only simple letters for the name of that function. I didn't get any output and error. I highlighted this function.
Lesson3.js
...ANSWER
Answered 2020-Jun-04 at 10:06Here, you have tried to use FormattedDate as a component. Not as an ordinary function.
All React component names must start with a capital letter. If you start a component name with a lowercase letter, it will be treated as a built-in element like a
You can find more information here
QUESTION
ANSWER
Answered 2020-Apr-25 at 19:31Change this line :
QUESTION
I'm experimenting with N3.js (RDF.js) and I see that it provides an API for storing triples in memory and accessing/updating/working with them. what is a good way to instead work with triples stored in a database?
I see that N3.js also provides a means of serializing/deserializing between in-memory triples and RDF documents. I also see that there are a few DBMSs that seem to be specifically for working with persisted triple storage (GraphDB, and presumably others).
Is the intention behind the N3.js project that users work with the file system directly?
...ANSWER
Answered 2020-Mar-19 at 11:31what is a good way to instead work with triples stored in a database?
There are lots of RDF databases, "triplestores", to choose from, Jena, GraphDB that you mention, AllegroGraph, AWS Neptune, RDF4J... These all store RDF natively and RDF is always RDF (i.e. perfectly interchangeable) so you can use any triplestore and change your mind to use another and easily move the data over.
Is the intention behind the N3.js project that users work with the file system directly?
Not necessarily: it's a parsing tool for certain forms of RDF data but where you put it is up to you!
QUESTION
I'm using React Navigation in my App. I created the createStackNavigator with createBottomTabNavigator in Header I'm trying to access the params that is I'm passing from my screen but these params are not available. And I also want when somebody click on Header button then move on to new screen but problem is that 'navigation.navigator()` function is not available in header buttons.
Here is how my Nav.js looks like:
...ANSWER
Answered 2020-Feb-05 at 06:40You can solve this problem by creating a button that has a navigation function.
withNavigation is a higher order component which passes the navigation prop into a wrapped component. It's useful when you cannot pass the navigation prop into the component directly, or don't want to pass it in case of a deeply nested child.
Exmaple
QUESTION
I cannot listen to messages being broadcast on 255.255.255.255. The ArtNet protocol docs say that ArtNet controllers broadcast onto 255.255.255.255 on port 6454 (see also here.
When I try to listen to 255.255.255.255 using node.js's dgram module, I get an "EINVAL" errror, because 255.255.255.255 is an invalid address.
I've tried subscribing to 192.255.255.255, 192.168.255.255, and 192.168.10.255 (instead of 255.255.255.255). None of these work either. Tested on Windows and Ubuntu.
ANSWER
Answered 2019-Sep-29 at 23:05socket.addMembership() is used to enroll a socket as a destination for multicast traffic. Your use case here is broadcast, not multicast, so don't try to use addMembership() at all.
You shouldn't need to do anything special to receive broadcast traffic. Just bind() your socket to the appropriate port (in this case 6454) as you are already doing, and then your socket's message-event callback should fire whenever a broadcast to that port is received.
If you want to write a test program to exercise your listener by sending broadcast traffic to port 6454 then that test program will need to call setBroadcast() on its dgram socket before trying to send() to port 6454 at the 255.255.255.255 broadcast address.
QUESTION
Suppose I have this function:
...ANSWER
Answered 2019-Sep-18 at 08:56You can bind args to solve this issue
QUESTION
I created a React project and I would like to install on it a bootswatch theme.
The theme is display but some component of it that use js don't work. Like modal or dropdown.
I followed there install documentation: - npm install bootswatch - import it css files
I tried to install bootstrap too but no result, the theme doesn't use directly their component.
index.js:
...ANSWER
Answered 2019-Aug-30 at 04:22There is no specific or separate JS file for bootswatch, so we only need to worry about getting the bootswatch theme added to our project; for the JS part, we use reactstrap
relevant JS:
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