interface.js | gui library for music / arts applications | Frontend Framework library
kandi X-RAY | interface.js Summary
kandi X-RAY | interface.js Summary
live demos and sample code : interface.js is a gui library designed to be device agnostic; it works with mouse, touch and motion events. this means you can write a gui once and be reasonably assured that it will work on smartphones, tablets and laptops. although you can register for touch or mouse events individually with widgets, interface.js adds a new event category, touchmouse events, that works for both types. the onvaluechange event handler is also agnostic to the touch / mouse divide. sizes and positions of widgets can be provided either in absolute pixel dimensions or relative to the size of the widgets containing panel. by using relative sizing and positioning you can ensure that interfaces will have the same relative sizes and positioning
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QUESTION
General issue:
I've been having a hard time trying to build a simple CRUD app using JavaScript + node JS + express + sequelize (MySQL).
Contextualization about the project
My CRUD app is being developed to manage students from a particular English teacher.
There are some table models created: Alunos - English: Students, Boletos - English: Pay Order, Aulas - English: Classes, and others that are not mandatory to explain for this issue for now.
Specific issue:
There is a post route that takes some of my body contents and inserts a new student to table "Alunos". After the row containing student data is created, I need to create registries for "Boletos", it would be 12 month of Pay Orders registered into this table. There are two problems with this part: the first I register a student, it works fine, but I could not get the auto-increment id generated by the model to insert in the foreign key "AlunoId", so the foreign key for "Boletos" table is set to null. The other problem is that the both entries (1 into "Alunos" and 12 into "Boletos") works fine at first, to registry the first student, but after the page is refreshed and I try to registry another student, node JS throws an error:
ANSWER
Answered 2021-Apr-28 at 16:40You need to either use db.Aluno.create() or set db.Aluno.build({...}, { isNewRecord: true }) to let Sequelize know it's an insert and not a record with a primary key value of 0. Your DB likely sees the ID of 0 and either inserts it or sets it to 1, either way you will get a conflict on the second insert.
It's also a good idea to wrap your router/controller code in a try/catch to handle any errors. Use a transaction that is passed to all your queries/inserts so that you can roll them all back if there is an error at any stage - const transaction = await sequelize.transaction(); const aluno = await db.Aluno.create({...}, { transaction });. Commit at the end with await transaction.commit() or in the catch block roll back with await transaction.rollback().
Don't use await in a for loop - its the same as blocking for each call which is inefficient and slow. Instead you can pass an array of promises to Promise.all() and resolve them concurrently.... objList.push(boleto.save()); (don't await here) and then await Promise.all(objList);.
Some last notes - it's good to use const when a variable won't change and let when it might to make your results more consistent. You should also try to have an explicit return from arrow functions.
Here is your code with the changes applied.
QUESTION
I'm building an App in Node.js to manage a database for a coding school. So far I have 2 models: Courses and Teachers. In the form to add a course I inserted an option to not select a teacher for a course.
I can insert the value of 'null' without a problem when using the DB GUI:
...ANSWER
Answered 2021-Mar-18 at 07:26It looks like a "null" != null problem. Probably you are trying to insert the string "null". Hence the error message. tearcher_id must be an integer or null, but not "null".
Check the place in your code where the course object is created. If the option "null" was selected in the form, you must set course.teacher = null and not just take the value from the form.
QUESTION
I have mostly only seen mocks and stubs used in automated testing. But I wanted to stub methods for manually testing my app. This way I can run my server and test my app manually in my browser and when I press a button to buy an item for example, the backend will have been stubbed so that the call to stripe is stubbed with a fake call to stripe.
I want to create a test environment to do this. In this test environment I want to stub some methods, like api calls to stripe. I would think one would create this test environment by writing a script that stubs methods and then launches the app from a child process after the stubs are set.
But I'm having trouble stubbing methods before launching a script as a child process. When I launch a file using child_process, stubbing isn't working.
To recreate:
- Go to this sandbox
- Go to the terminal and click the + button to open a non-read-only terminal
- Run
node src/runStubbedScript.js
In the terminal you will get:
making an http request to Stripe. This may take a while...
But I would expect the stub to replace it and give me skipping call to stripe.
How do I stub methods before launching a script?
Codeindex.js:
ANSWER
Answered 2021-Feb-10 at 21:47Instead of executing a child_process I realized I could just require the file and it would do what I wanted:
QUESTION
I wrote a discord music bot, and i used ffmpeg so that i put the executable in the botfolder, now i wanna push the bot into heroku, installed the npm package, but get this error in heroku:
...ANSWER
Answered 2021-Jan-02 at 00:33Now it works, just needed to add ffmpeg-static
QUESTION
On our application we are using flow for typechecking, which is all good and fine, however there seems to be a very large amount of dependencies that need to be checked on each incremental pass of the type checker, a single change on a very leaf component generates the following output:
...ANSWER
Answered 2020-Nov-28 at 02:55You should try upgrading Flow to v0.133 and switch to the Types-First architecture, or enable it on earlier releases. The rechecks have considerably improved, as explained, since all module exports are now annotated instead of being infered. There is a codemod availble for annotating exports on large codebases:
QUESTION
Hey y'all I'm attempting to give a go at a todo app on my own with minimal tutorial help so I can work things through. I'm using react hooks and am a little confused on why after pushing a new todo to my array it does not re-render. Would I need useEffect? I suspect it might have something to do with arrays being immutable? Also, if you check the console in the codesandbox I get weird behavior where if you click add todo and leave the input the same it will add multiple todos to the array, however when you type in a different input it erases them all and just replaces it with the current value you put in. Any help with these issues would be great so I can keep working!
Codesandbox: https://codesandbox.io/s/musing-einstein-2n121?file=/src/interface.js
...ANSWER
Answered 2020-Oct-03 at 04:34You need to store the todos in state for the component to rerender,
Try this:
https://codesandbox.io/s/nervous-goldberg-t3kn3?file=/src/interface.js
QUESTION
I have been trying out aws lambda with node+knex and have the same issue as this question : AWS Lambda with Knex JS and RDS Postgres
Here is my code for handler.js:
...ANSWER
Answered 2020-Sep-20 at 22:12Anything defined outside of the handler being exported is persisted on the lambda instance that is provisioned. So what's happening is that the instance is starting with the knex connection, but is being destroyed on the first request. You aren't creating a new connection to knex on each new request to your lambda in this case.
If you want to connect and destroy per request, then you need to instantiate knex inside of the function.
QUESTION
I have a Sequelize migration script with this piece of code in it.
...ANSWER
Answered 2020-Sep-01 at 18:15As mentioned in Sequelize documentation,
MySQL does not support RETURNING for INSERT statements. It would work only for Postgres.
QUESTION
[Resolved !]
I've researched a lot on the Internet and found some similar question with mine. But, I can't find the proper way to fix my problem. Please help.
I'm using Sequelize v6. I've some troubles in using models and migrations.
What I've done:
I generated role model using sequelize cli. And it gives me below code in models/role.js.
ANSWER
Answered 2020-Jul-20 at 08:13I've fixed my problem. I can now use each naming convention for their specific world: under_score for MySQL and camelCase for JavaScript.
So here I've written my solution if someone come across the same issue in the future.
I'm using sequelize-cli for creating migrations, models and seeders. You can check it here.
Migration
Migration is only responsible for creating/altering/deleting the tables and columns. It access with only the database.
migrations/timestamp-create-role-table.js
QUESTION
I wrote a custom node for node red and everything is working fine. Now I need to put everything in a docker container. Node red is running and the dependency is installed, but the nodes do not show up on the interface. I do not get any error messages, even when I not include the files, what causes an error on the standalone version.
My package.json:
...ANSWER
Answered 2020-Jul-17 at 12:34Normally you'd package your node as an npm module and then npm install it.
In this instance, you can still load what we call 'local' nodes which aren't packaged properly. By default Node-RED will look under the nodes directory of node-red user directory.
In the docker image, /data is used as the user directory.
So you should be copying your files somewhere under /data/nodes/
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