xstate | State machines and statecharts for the modern web
kandi X-RAY | xstate Summary
kandi X-RAY | xstate Summary
JavaScript and TypeScript finite state machines and statecharts for the modern web. Read the documentation. Explore our catalogue of examples. Adheres to the SCXML specification. Chat on the Stately Discord Community.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of xstate
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Trending Discussions on xstate
QUESTION
Having a hard time traversing and querying elements from a jsonb[]
row.
ANSWER
Answered 2022-Apr-09 at 06:24In PostgreSQL all jsonb array functions
only for using JSONB
types, not JSONB[]
.
First-way you can use
unnest
function to convert arrays to rows, after then you can usejsonb_array_elements
.Second-way change type
JSONB[]
toJSON
in your table. Don't worry, you can still insert your JSON string data which is written above intoJSONB
field without any problems. Inside theJSON
andJSONB
strings, we can use arrays using formatted strings.Jsonb array functions
only for arrays written inside JSON string.
QUESTION
I am using xstate
with react
to implement a basic login functionality. The code is here and the issue I am facing is, on the event AUTHENTICATING
it is meant to invoke a service authenticateUser
and it is not invoking. No visible errors in the console. The component looks like
ANSWER
Answered 2022-Mar-08 at 14:56From docs:
An invocation is defined in a state node's configuration with the invoke property
You are instead trying to invoke in an event node, not a state one.
For example, you could do:
QUESTION
ANSWER
Answered 2021-Sep-03 at 13:34I can't speak for the xstate-part, but the last snippet is definitely not working. You can't dynamically declare a tag like this. But you can use the special element for this:
QUESTION
I am trying to create a state machine which can persist the machine's state details at any given point in time and then restore the machine with the persisted state and context values on revisiting the page. The Xstate docs mention about persisting data and rehydration using the local storage but I am unable to do so. I have made a sandbox link to try and replicate the issue. Can someone help or guide me on what I may be doing wrong?
Thanks in advance
Codesandbox link: https://codesandbox.io/s/green-snow-ortw6?file=/src/App.js
...ANSWER
Answered 2021-Dec-27 at 17:27You must pass the persisted state the first time that you invoke to useMachine
, do not forget that useMachine
is a closure, in that way it will work, for instance
QUESTION
I have the following React.js component that needs the following:
- Persist the state when a button is clicked through using fetch to call a server side API.
- When the component is initialized that the state is set in the component after calling
useEffect
that uses fetch to call a server side API to get the current state of the object.
Here is the display of the component
Here is what I have so far.
...ANSWER
Answered 2021-Dec-02 at 18:25From the comment from Taxel, I was able to find my solution. Here is the changed react element. I would appreciate any additional comments to make this even better.
Thank You!
QUESTION
I am trying to set up a dropdown that is dependent on the selection of a previous dropdown in Word using VBA-Code. I watched a bunch of videos and read through forums, but I cannot make it work. I used the Word Legacy dropdowns and labelled them correctly, then I wrote the following code in VBA:
...ANSWER
Answered 2021-Nov-25 at 14:06Assumption: you have a word document with two dropdown content controls. For both the tag name is set: ccType and ccSelection.
In the class module of ThisDocument
you put the following code:
QUESTION
After reading the official xstate tutorial, I tried to implement my own machine inspired by this post on dev.to by one of the xstate's dev.
Everything works as expected besides that output
does not seem to be updated. The assignment does not do its job I think. What did I forget?
To compare, here is a working demo from xstate where the variable in the context is updated as expected.
more information on assign on Context | XState Docs
my code:
...ANSWER
Answered 2021-Sep-17 at 16:28You need to return a Promise then and have the state machine update the context after the Promise is resolved.
The context is updated in the onDone
property of invoke
.
QUESTION
I have a requirement to create a Service Change in Azure DevOps (TFS WorkItems) using Rest API in PowerShell.
My current code is working fine for Task Creation. But I have to create a Service Change. I am not sure about the Resource Area IDs. Which URI should I use?
...ANSWER
Answered 2021-Jul-01 at 02:58Actually I poked around on available fields and I was able create Service Change using PowerShell. I rest my case. thanks for the help.
We can use below WorkItemTrackingAreaId to create Service Change.
QUESTION
The checkbox in header check all chekbox (SelectAllCheckboxes), and a checkbox in each line (calculateAllCheckboxes).
When check the checkbox in header, the function calculateAllCheckboxes fires also.
How can I prevent that??
...ANSWER
Answered 2021-Jun-15 at 01:41The problem is in this line:
QUESTION
I am using xstate
together with vuex
in my application:
vuex
handles the user, api calls, response items, etc.xstate
handles mainly complex form interactions.
Due to the reason, that complex forms contain multiple components, which communicate with each other I have to implement xstate
not on a component level, but inside vuex
. Inside the xstate visualizer it seems to work:
I can switch between the state, but in the real application it can't go back to its initial state (idle) and then stay there. It always transitions back to the next one. I don't know what I am doing wrong, but I have console logged the formState getter and the output looks like this:
...ANSWER
Answered 2021-May-27 at 21:33Problem is in your Form.vue
component. In this line to be precise:
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