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QUESTION
Having a hard time traversing and querying elements from a jsonb[] row.
CREATE TABLE foo (
id uuid PRIMARY KEY,
work_experience jsonb[] NOT NULL
);
INSERT INTO foo (id, work_experience)
VALUES (
'b4e942a0-49b4-4fa7-8f7a-5fbf0541d1c9',
E'{"{\\"id\\": \\"7cd74bae-ff5b-4f58-ab20-0218f820ffff\\", \\"skills\\": [{\\"id\\": \\"c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|fd3c41b8-8c15-47e2-a80d-cf3683b2d0da\\", \\"level1\\": \\"Programming languages\\", \\"level2\\": \\"Scripting languages\\", \\"level3\\": \\"TypeScript\\", \\"level1_id\\": \\"c8a5328d-87ba-419d-802f-80b1d940bb68\\", \\"level2_id\\": \\"313384d2-486d-4b7f-ba33-76b1cd696f0a\\", \\"level3_id\\": \\"fd3c41b8-8c15-47e2-a80d-cf3683b2d0da\\"}, {\\"id\\": \\"84dff39f-2ed6-408c-a188-14cf55a09c5b|e13b48c1-fd0f-4ecc-89de-58e9312b9435|686af7e4-6d58-4148-b227-3bf65ff10273\\", \\"level1\\": \\"Software frameworks & libraries\\", \\"level2\\": \\"Frontend frameworks & libraries\\", \\"level3\\": \\"React\\", \\"level1_id\\": \\"84dff39f-2ed6-408c-a188-14cf55a09c5b\\", \\"level2_id\\": \\"e13b48c1-fd0f-4ecc-89de-58e9312b9435\\", \\"level3_id\\": \\"686af7e4-6d58-4148-b227-3bf65ff10273\\"}, {\\"id\\": \\"84dff39f-2ed6-408c-a188-14cf55a09c5b|c4e54726-7bd5-44bb-8597-a05eb2272e2b|cda4441f-dba6-495c-9e2e-7429bd5e0465\\", \\"level1\\": \\"Software frameworks & libraries\\", \\"level2\\": \\"Backend frameworks & libraries\\", \\"level3\\": \\"Node.js\\", \\"level1_id\\": \\"84dff39f-2ed6-408c-a188-14cf55a09c5b\\", \\"level2_id\\": \\"c4e54726-7bd5-44bb-8597-a05eb2272e2b\\", \\"level3_id\\": \\"cda4441f-dba6-495c-9e2e-7429bd5e0465\\"}, {\\"id\\": \\"84dff39f-2ed6-408c-a188-14cf55a09c5b|e13b48c1-fd0f-4ecc-89de-58e9312b9435|fd3c41b8-8c15-47e2-a80d-cf3683b2d0da\\", \\"level1\\": \\"Software frameworks & libraries\\", \\"level2\\": \\"Frontend frameworks & libraries\\", \\"level3\\": \\"TypeScript\\", \\"level1_id\\": \\"84dff39f-2ed6-408c-a188-14cf55a09c5b\\", \\"level2_id\\": \\"e13b48c1-fd0f-4ecc-89de-58e9312b9435\\", \\"level3_id\\": \\"fd3c41b8-8c15-47e2-a80d-cf3683b2d0da\\"}], \\"end_date\\": null, \\"position\\": \\"Senior Software Engineer + Team Lead\\", \\"start_date\\": \\"2019-10-01T00:00:00\\", \\"description\\": \\"Draper, Utah, United States\\\\n• Architected Expert Portal* from the ground up using a Node/Typescript\\\\nbackend, a\\\\nPostgreSQL database, a GraphQL API layer, a Webpack build process, with a\\\\nTypescript/React front-end and XState for state management\\\\n• Enforced coding best practices with linting rules and code formatters by\\\\nautomating it in\\\\ngit workflow\\\\n• Automated deployment Expert Portal* to EC2 instances and the @pluralsight\\\\nNPM\\\\nartifactory using Github, TeamCity, and Octopus\\\\n• Improved product team workflow by building a browser extention to add\\\\nLeanKit card\\\\ntemplate functionality\\\\n• Consumed and published data through Kafka streams and RabbitMQ\\\\nmessages\\\\n• Interviewed, onboarded, and trained junior to mid-level engineers\\", \\"company_name\\": \\"Pluralsight\\"}","{\\"id\\": \\"9e2c2b44-39a4-4369-b237-c51fd938e61d\\", \\"skills\\": [{\\"id\\": \\"c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|012abcd1-3a6a-4803-a47e-42f46b402024\\", \\"level1\\": \\"Programming languages\\", \\"level2\\": \\"Scripting languages\\", \\"level3\\": \\"JavaScript\\", \\"level1_id\\": \\"c8a5328d-87ba-419d-802f-80b1d940bb68\\", \\"level2_id\\": \\"313384d2-486d-4b7f-ba33-76b1cd696f0a\\", \\"level3_id\\": \\"012abcd1-3a6a-4803-a47e-42f46b402024\\"}], \\"end_date\\": \\"2019-10-01T00:00:00\\", \\"position\\": \\"Software Engineer II\\", \\"start_date\\": \\"2017-11-01T00:00:00\\", \\"description\\": \\"Greater Salt Lake City Area\\\\nWorked on the KSL Jobs Classifieds team as a full-stack developer. Following\\\\nthe scrum methodology, I added new features and maintained all things\\\\npowered by KSL Jobs.\\\\n• Built and deployed a \\\\\\"white label\\\\\\" version of KSL Jobs for the Silicon Slopes\\\\nbrand. (https://siliconslopes.ksl.com)\\\\n• Rewrote major sections of the current KSL Jobs site in React.js\\\\n• Automated querying data for reports and analytic purposes through Node and\\\\nPHP scripts\\\\n• Provided rich data tracking through Google Tag Manager, Google Analytics,\\\\nand BigQuery\\\\n• Migrated Solr search engine to ElasticSearch with a GraphQL API\\", \\"company_name\\": \\"Deseret Digital Media\\"}","{\\"id\\": \\"efbf68f4-7bdc-4ab6-bba9-fbf7ec38aeef\\", \\"skills\\": [{\\"id\\": \\"c8a5328d-87ba-419d-802f-80b1d940bb68|f45abc59-1e7e-4853-a498-999fcf12d498|4b266297-6e25-4443-90ec-248bded4225a\\", \\"level1\\": \\"Programming languages\\", \\"level2\\": \\"High-level languages\\", \\"level3\\": \\"PHP\\", \\"level1_id\\": \\"c8a5328d-87ba-419d-802f-80b1d940bb68\\", \\"level2_id\\": \\"f45abc59-1e7e-4853-a498-999fcf12d498\\", \\"level3_id\\": \\"4b266297-6e25-4443-90ec-248bded4225a\\"}], \\"end_date\\": \\"2019-08-01T00:00:00\\", \\"position\\": \\"Full Stack Developer\\", \\"start_date\\": \\"2017-01-01T00:00:00\\", \\"description\\": \\"Provo, Utah Area\\\\nWorked with Appritech LLC to modernize their legacy software and add new\\\\nfeatures to automate their business processes.\\\\n• Building new call handler from the ground up using JavaScript ES6,\\\\nBootstrap, SASS for\\\\nfront-end, and PHP7/Laravel for back-end\\\\n• Implemented real-time call management system and built reporting API.\\\\nImproved call agent\\\\nproductivity by 70%\\\\n• Upgraded deprecated PHP legacy code to PHP 7\\\\n• Synchronized follow up calls with Twilio API functionality for SMS message\\\\nforwarding\\\\n• Installed and setup Apache server for an after hours call center\\", \\"company_name\\": \\"Appritech Software\\"}","{\\"id\\": \\"2db60c6c-c214-4d9b-9034-baba676203a8\\", \\"skills\\": [{\\"id\\": \\"c8a5328d-87ba-419d-802f-80b1d940bb68|f45abc59-1e7e-4853-a498-999fcf12d498|4b266297-6e25-4443-90ec-248bded4225a\\", \\"level1\\": \\"Programming languages\\", \\"level2\\": \\"High-level languages\\", \\"level3\\": \\"PHP\\", \\"level1_id\\": \\"c8a5328d-87ba-419d-802f-80b1d940bb68\\", \\"level2_id\\": \\"f45abc59-1e7e-4853-a498-999fcf12d498\\", \\"level3_id\\": \\"4b266297-6e25-4443-90ec-248bded4225a\\"}], \\"end_date\\": \\"2017-09-01T00:00:00\\", \\"position\\": \\"Web Developer\\", \\"start_date\\": \\"2017-02-01T00:00:00\\", \\"description\\": \\"Provo, Utah Area\\\\nWorked with Redcore LLC to build entrepreneurial tools, marketing tools, and\\\\nadding new functionality to the current Wordpress-integrated website and\\\\nCMS.\\\\n• Built Brand Management website from the ground up using Bootstrap and\\\\nJavaScript on the\\\\nfront end, with PHP and MySQL on the back-end\\\\n• Automated managerial and accounting tasks, such as invoice generation,\\\\nand transactions using Stripe API\\\\n• Debugged and perfected current web applications to enrich UX\\\\n• Doubled clientele by expanding Redcore services offered to include website\\\\ncreation and\\\\nmanagement\\", \\"company_name\\": \\"Redcore LLC\\"}","{\\"id\\": \\"c3f1d5b2-5586-477d-ae4c-e2927463244e\\", \\"skills\\": [{\\"id\\": \\"c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|012abcd1-3a6a-4803-a47e-42f46b402024\\", \\"level1\\": \\"Programming languages\\", \\"level2\\": \\"Scripting languages\\", \\"level3\\": \\"JavaScript\\", \\"level1_id\\": \\"c8a5328d-87ba-419d-802f-80b1d940bb68\\", \\"level2_id\\": \\"313384d2-486d-4b7f-ba33-76b1cd696f0a\\", \\"level3_id\\": \\"012abcd1-3a6a-4803-a47e-42f46b402024\\"}], \\"end_date\\": \\"2017-03-01T00:00:00\\", \\"position\\": \\"Software and Web Developer\\", \\"start_date\\": \\"2016-12-01T00:00:00\\", \\"description\\": \\"Provo, Utah Area\\\\nThis internship was focused on building core website and software for\\\\nCentaurific using the LAMP stack.\\\\n• Created dynamic landing pages for products to generate leads\\\\n• Designed a MySQL database to organize data and generate excel reports\\\\n• Revitalized marketing efforts through analytics and a social media sharing\\\\npage\\", \\"company_name\\": \\"Centaurific\\"}"}'
);
(Here is what that work_experience row looks like in JSON:)
[
{
"id": "7cd74bae-ff5b-4f58-ab20-0218f820ffff",
"skills": [
{
"id": "c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|fd3c41b8-8c15-47e2-a80d-cf3683b2d0da",
"level1": "Programming languages",
"level2": "Scripting languages",
"level3": "TypeScript",
"level1_id": "c8a5328d-87ba-419d-802f-80b1d940bb68",
"level2_id": "313384d2-486d-4b7f-ba33-76b1cd696f0a",
"level3_id": "fd3c41b8-8c15-47e2-a80d-cf3683b2d0da"
},
{
"id": "84dff39f-2ed6-408c-a188-14cf55a09c5b|e13b48c1-fd0f-4ecc-89de-58e9312b9435|686af7e4-6d58-4148-b227-3bf65ff10273",
"level1": "Software frameworks & libraries",
"level2": "Frontend frameworks & libraries",
"level3": "React",
"level1_id": "84dff39f-2ed6-408c-a188-14cf55a09c5b",
"level2_id": "e13b48c1-fd0f-4ecc-89de-58e9312b9435",
"level3_id": "686af7e4-6d58-4148-b227-3bf65ff10273"
},
{
"id": "84dff39f-2ed6-408c-a188-14cf55a09c5b|c4e54726-7bd5-44bb-8597-a05eb2272e2b|cda4441f-dba6-495c-9e2e-7429bd5e0465",
"level1": "Software frameworks & libraries",
"level2": "Backend frameworks & libraries",
"level3": "Node.js",
"level1_id": "84dff39f-2ed6-408c-a188-14cf55a09c5b",
"level2_id": "c4e54726-7bd5-44bb-8597-a05eb2272e2b",
"level3_id": "cda4441f-dba6-495c-9e2e-7429bd5e0465"
},
{
"id": "84dff39f-2ed6-408c-a188-14cf55a09c5b|e13b48c1-fd0f-4ecc-89de-58e9312b9435|fd3c41b8-8c15-47e2-a80d-cf3683b2d0da",
"level1": "Software frameworks & libraries",
"level2": "Frontend frameworks & libraries",
"level3": "TypeScript",
"level1_id": "84dff39f-2ed6-408c-a188-14cf55a09c5b",
"level2_id": "e13b48c1-fd0f-4ecc-89de-58e9312b9435",
"level3_id": "fd3c41b8-8c15-47e2-a80d-cf3683b2d0da"
}
],
"end_date": null,
"position": "Senior Software Engineer + Team Lead",
"start_date": "2019-10-01T00:00:00",
"description": "Draper, Utah, United Statesn• Architected Expert Portal* from the ground up using a Node/Typescriptnbackend, anPostgreSQL database, a GraphQL API layer, a Webpack build process, with anTypescript/React front-end and XState for state managementn• Enforced coding best practices with linting rules and code formatters bynautomating it inngit workflown• Automated deployment Expert Portal* to EC2 instances and the @pluralsightnNPMnartifactory using Github, TeamCity, and Octopusn• Improved product team workflow by building a browser extention to addnLeanKit cardntemplate functionalityn• Consumed and published data through Kafka streams and RabbitMQnmessagesn• Interviewed, onboarded, and trained junior to mid-level engineers",
"company_name": "Pluralsight"
},
{
"id": "9e2c2b44-39a4-4369-b237-c51fd938e61d",
"skills": [
{
"id": "c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|012abcd1-3a6a-4803-a47e-42f46b402024",
"level1": "Programming languages",
"level2": "Scripting languages",
"level3": "JavaScript",
"level1_id": "c8a5328d-87ba-419d-802f-80b1d940bb68",
"level2_id": "313384d2-486d-4b7f-ba33-76b1cd696f0a",
"level3_id": "012abcd1-3a6a-4803-a47e-42f46b402024"
}
],
"end_date": "2019-10-01T00:00:00",
"position": "Software Engineer II",
"start_date": "2017-11-01T00:00:00",
"description": "Greater Salt Lake City AreanWorked on the KSL Jobs Classifieds team as a full-stack developer. Followingnthe scrum methodology, I added new features and maintained all thingsnpowered by KSL Jobs.n• Built and deployed a "white label" version of KSL Jobs for the Silicon Slopesnbrand. (https://siliconslopes.ksl.com)n• Rewrote major sections of the current KSL Jobs site in React.jsn• Automated querying data for reports and analytic purposes through Node andnPHP scriptsn• Provided rich data tracking through Google Tag Manager, Google Analytics,nand BigQueryn• Migrated Solr search engine to ElasticSearch with a GraphQL API",
"company_name": "Deseret Digital Media"
},
{
"id": "efbf68f4-7bdc-4ab6-bba9-fbf7ec38aeef",
"skills": [
{
"id": "c8a5328d-87ba-419d-802f-80b1d940bb68|f45abc59-1e7e-4853-a498-999fcf12d498|4b266297-6e25-4443-90ec-248bded4225a",
"level1": "Programming languages",
"level2": "High-level languages",
"level3": "PHP",
"level1_id": "c8a5328d-87ba-419d-802f-80b1d940bb68",
"level2_id": "f45abc59-1e7e-4853-a498-999fcf12d498",
"level3_id": "4b266297-6e25-4443-90ec-248bded4225a"
}
],
"end_date": "2019-08-01T00:00:00",
"position": "Full Stack Developer",
"start_date": "2017-01-01T00:00:00",
"description": "Provo, Utah AreanWorked with Appritech LLC to modernize their legacy software and add newnfeatures to automate their business processes.n• Building new call handler from the ground up using JavaScript ES6,nBootstrap, SASS fornfront-end, and PHP7/Laravel for back-endn• Implemented real-time call management system and built reporting API.nImproved call agentnproductivity by 70%n• Upgraded deprecated PHP legacy code to PHP 7n• Synchronized follow up calls with Twilio API functionality for SMS messagenforwardingn• Installed and setup Apache server for an after hours call center",
"company_name": "Appritech Software"
},
{
"id": "2db60c6c-c214-4d9b-9034-baba676203a8",
"skills": [
{
"id": "c8a5328d-87ba-419d-802f-80b1d940bb68|f45abc59-1e7e-4853-a498-999fcf12d498|4b266297-6e25-4443-90ec-248bded4225a",
"level1": "Programming languages",
"level2": "High-level languages",
"level3": "PHP",
"level1_id": "c8a5328d-87ba-419d-802f-80b1d940bb68",
"level2_id": "f45abc59-1e7e-4853-a498-999fcf12d498",
"level3_id": "4b266297-6e25-4443-90ec-248bded4225a"
}
],
"end_date": "2017-09-01T00:00:00",
"position": "Web Developer",
"start_date": "2017-02-01T00:00:00",
"description": "Provo, Utah AreanWorked with Redcore LLC to build entrepreneurial tools, marketing tools, andnadding new functionality to the current Wordpress-integrated website andnCMS.n• Built Brand Management website from the ground up using Bootstrap andnJavaScript on thenfront end, with PHP and MySQL on the back-endn• Automated managerial and accounting tasks, such as invoice generation,nand transactions using Stripe APIn• Debugged and perfected current web applications to enrich UXn• Doubled clientele by expanding Redcore services offered to include websitencreation andnmanagement",
"company_name": "Redcore LLC"
},
{
"id": "c3f1d5b2-5586-477d-ae4c-e2927463244e",
"skills": [
{
"id": "c8a5328d-87ba-419d-802f-80b1d940bb68|313384d2-486d-4b7f-ba33-76b1cd696f0a|012abcd1-3a6a-4803-a47e-42f46b402024",
"level1": "Programming languages",
"level2": "Scripting languages",
"level3": "JavaScript",
"level1_id": "c8a5328d-87ba-419d-802f-80b1d940bb68",
"level2_id": "313384d2-486d-4b7f-ba33-76b1cd696f0a",
"level3_id": "012abcd1-3a6a-4803-a47e-42f46b402024"
}
],
"end_date": "2017-03-01T00:00:00",
"position": "Software and Web Developer",
"start_date": "2016-12-01T00:00:00",
"description": "Provo, Utah AreanThis internship was focused on building core website and software fornCentaurific using the LAMP stack.n• Created dynamic landing pages for products to generate leadsn• Designed a MySQL database to organize data and generate excel reportsn• Revitalized marketing efforts through analytics and a social media sharingnpage",
"company_name": "Centaurific"
}
]
I'd like to query out the structure. I tried this and a few other variants of it to no avail:
SELECT workexp
FROM foo,
jsonb_array_elements(work_experience) workexp;
And I get this error message:
ERROR: function jsonb_array_elements_text(jsonb[]) does not exist
LINE 3: jsonb_array_elements(work_experience) workexp;
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
Everything I look up has documentation on traversing and querying jsonb rows, but not jsonb[] ones. How can I query for the "skills"."id"s?
EDIT -- SOLUTION: All of the solutions given were helpful but I selected Ramin Faracov for suggesting to use unnest. Thank you!
This is the query that I came up with:
SELECT
id expert_id,
we_sk->>'id' work_exp_skill_id
FROM (
SELECT
id,
unnest(work_experience)->'skills' we
FROM foo_json
) sk,
jsonb_array_elements(sk.we) we_sk;
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
unnestfunction to convert arrays to rows, after then you can usejsonb_array_elements.Second-way change type
JSONB[]toJSONin your table. Don't worry, you can still insert your JSON string data which is written above intoJSONBfield without any problems. Inside theJSONandJSONBstrings, we can use arrays using formatted strings.Jsonb array functionsonly for arrays written inside JSON string.
QUESTION
I was trying to crop videos with cropper.js, but from what I understand that it is impossible and only works for photos. I've looked everywhere for resources to do such, but I couldn't find anything. If you don't know what I am talking about I would like something like this https://codesandbox.io/s/react-easy-crop-for-videos-lfhme but uses JavaScript instead of React. The reason I don't want to switch to a frontend framework is because I am using Django for my backend, and am not comfortable with switching to APIs, and using React or Vue, since I am really far into my project. I also want to avoid using a hybrid architecture if possible. If anyone knows of any libraries or repositories I can check out that might help me that would be much appreciated.
Just in case I can use videos in cropper.js here is my source code.
// file-box is the id of the div element that will store our cropping file preview
const filebox = document.getElementById('file-box')
// crop-btn is the id of button that will trigger the event of change original file with cropped file.
const crop_btn = document.getElementById('crop-btn')
// id_file is the id of the input tag where we will upload the file
const input = document.getElementById('id_file')
// When user uploads the file this event will get triggered
input.addEventListener('change', ()=>{
// Getting file file object from the input variable
const img_data = input.files[0]
// createObjectURL() static method creates a DOMString containing a URL representing the object given in the parameter.
// The new object URL represents the specified File object or Blob object.
const url = URL.createObjectURL(img_data)
// Creating a file tag inside filebox which will hold the cropping view file(uploaded file) to it using the url created before.
filebox.innerHTML = ``
// Storing that cropping view file in a variable
const file = document.getElementById('file')
// Displaying the file box
document.getElementById('file-box').style.display = 'block'
// Displaying the Crop buttton
document.getElementById('crop-btn').style.display = 'block'
// Hiding the Post button
document.getElementById('confirm-btn').style.display = 'none'
// Creating a croper object with the cropping view file
// The new Cropper() method will do all the magic and diplay the cropping view and adding cropping functionality on the website
// For more settings, check out their official documentation at https://github.com/fengyuanchen/cropperjs
const cropper = new Cropper(file, {
autoCropArea: 1,
aspectRatio: 1/1,
viewMode: 1,
scalable: false,
zoomable: false,
movable: false,
minCropBoxWidth: 200,
minCropBoxHeight: 200,
})
// When crop button is clicked this event will get triggered
crop_btn.addEventListener('click', ()=>{
// This method coverts the selected cropped file on the cropper canvas into a blob object
cropper.getCroppedCanvas().toBlob((blob)=>{
// Gets the original file data
let fileInputElement = document.getElementById('id_file');
// Make a new cropped file file using that blob object, file_data.name will make the new file name same as original file
let file = new File([blob], img_data.name,{type:"file/*", lastModified:new Date().getTime()});
// Create a new container
let container = new DataTransfer();
// Add the cropped file file to the container
container.items.add(file);
// Replace the original file file with the new cropped file file
fileInputElement.files = container.files;
// Hide the cropper box
document.getElementById('file-box').style.display = 'none'
// Hide the crop button
document.getElementById('crop-btn').style.display = 'none'
// Display the Post button
document.getElementById('confirm-btn').style.display = 'block'
});
});
});
ANSWER
Answered 2022-Mar-05 at 20:48You didn't explain your use case in much detail, but if you just want to crop videos with a few known aspect ratio options, you can do this pretty easily do this with vanilla HTML, CSS, and JavaScript.
HTML:
CSS:
.crop-container {
overflow:hidden;
display:flex;
align-items: center;
justify-content: center;
height: 0;
position: relative;
}
.crop-container video {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
height: 100%;
}
.aspect-ratio-16x9 {
padding-top: calc(9 / 16 * 100%);
}
.aspect-ratio-4x3 {
padding-top: calc(3 / 4 * 100%);
}
The aspect ratio is always the height divided by the width * 100%.
And then you can apply the the classes however you want, for example:
function switchAspectRatio(ratio) {
const el = document.querySelector('.crop-container');
// Remove any previous aspect ratios
for (let i = el.classList.length - 1; i >= 0; i--) {
const className = el.classList[i];
if (className.startsWith('aspect-ratio-')) {
el.classList.remove(className);
}
}
// Add the new one
el.classList.add(`aspect-ratio-${ratio}`);
}
Here's an example fiddle.
QUESTION
I am new to programming and one thing I am very confused about, my boss has told me to create a rest API about an app which I have completed all the signups, login, and other parts. But now I have to create a frontend but all the tutorials on the internet are about create rest API of Django to react or some other frontend framework, is their any tutorial on YouTube about connecting to a html CSS JavaScript on frontend to Rest API. thanks.
ANSWER
Answered 2022-Feb-12 at 08:36If you don't want a frontend just follow the official django tutorial to learn how to serve html/css/js from django.
From there you can either pass the data you need from your api down through the django context, or you can use fetch or something similar to grab it from javascript.
The latter would look like this.
# views.py
def index(request):
return render(request, 'index.html')
def apiview(request):
return JsonResponse({'title', 'served from api'})
index.html
QUESTION
I am trying to have my frontend server pull an http request from my backend server, but am getting the following error in my browser console:
Access to XMLHttpRequest at 'http://localhost:8080/run' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
I know this is a security protocol, but is there an easy way to override this issue and allow for port 8080 (my backend) to return calls from port (3000)?
edit: I am using java springboot as my backend framework and React as my frontend framework
edit 2: I installed and used the Moesif Origin & CORS Changer extension and it works, I just would like to know if there is a more permanent workaround.
ANSWER
Answered 2021-Nov-05 at 22:27A quick approach is to add @CrossOrigin (import is org.springframework.web.bind.annotation.CrossOrigin) to your Rest Controller(s).
QUESTION
I have a container being used to hold a registration form. I tried adding position: relative then using top: combined with a negative integer to move the image, but what happens instead is that the entire container is being moved, rather than the background image. I am using bootstrap as a frontend framework.
.mt {
margin-top: 25px;
margin-bottom: 25px;
}
.reg-bg {
background-image: url("../img/reg-bg.png");
background-repeat: no-repeat;
border-radius: 15px;
}
.reg-btn {
background-color: #003049;
color: #FCBF49;
width: 150px;
height: 50px;
font-size: 20px;
}
.reg-btn:hover {
background-color: #FCBF49;
color: #003049;
}
Create an account
Your Name
Your Email
Password
Repeat your password
Register
Already have an account with us? Login here
Validation email timed out? Click here
jsfiddle: https://jsfiddle.net/p4udb7c3/5/
ANSWER
Answered 2022-Jan-30 at 01:32The first point is to try not to use negative position value in your CSS code as much as possible. It's kind of dirty code and may cause some issues in styling later!
Why don't you use background-position to set the position of the image background?
as an example:
.reg-bg {
background-position: top center;
}
You can find more information here.
QUESTION
I know the standard way is to use Express, but i was wondering how i could achieve this without having to use it. I already know how to serve html files using http/https in a common website (without a frontend framework) through nodejs, but when i tried to do the same with index.html from React app, it wouldn't work. I think it's important to mention that i am using react-router. I searched a lot about this but every tutorial would use Express, so i couldn't find help in google.
Here's how i would do with plain html:
const server = http.createServer( async (req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/html');
const requestUrl = url.parse(req.url);
let completePath = requestUrl.pathname;
let path = completePath.split('/').slice(1)[0];
let fileContent;
if(path == "")
path = "index.html";
try{
fileContent = fs.readFileSync(path);
res.end(fileContent, 'utf-8');
}
catch(err){
console.log("File not found: " + path);
if(path != "favicon.ico"){
res.statusCode = 404;
fileContent = fs.readFileSync("404.html");
res.end(fileContent);
}
}
});
Thanks!
ANSWER
Answered 2021-Dec-19 at 20:00Ok, i eventually got it:
const fs = require('fs');
const https = require('http');
const hostname = 'localhost';
const port = 3000;
const server = https.createServer( async (req, res) => {
res.statusCode = 200;
let root = "./build";
let path = root + req.url;
let fileContent;
if(path == root + "/")
path = path + "index.html";
try{
fileContent = fs.readFileSync(path);
res.end(fileContent, 'utf-8');
}
catch(err){
if(req.url != "/favicon.ico"){
fileContent = fs.readFileSync(root + "/index.html");
res.end(fileContent);
}
}
});
server.listen(port, hostname, () => {
console.log("Server listening on " + port);
});
as opposed to Express version:
const express = require("express");
const app = express();
// this throws everything to the user
app.use(express.static(__dirname + "/build"));
// this redirects everything to index.html
app.get('*', (req, res) => {
res.sendFile(__dirname + "/build/index.html");
});
app.listen(port, hostname, () => {
console.log("Server listening on " + port);
});
QUESTION
I am using React.js as Frontend framework,
I have an icon from antd, and I want to put it in the 'alt' prop of an image tag, so in case that the url I pass there will be null - it will go to put the icon there.
I tried using 'alt' but it only accepts string. is it possible to put there an icon? (like one from antd?)
to emphasize - I want to add it as - }
as in in an actual icon and NOT AS A URL.
ANSWER
Answered 2021-Dec-19 at 12:17QUESTION
I am writing code that uses data binding to change the innerHTML of an span to the input of the user, but I can't get it to work. What it should do is show the input on the right side of the input field on both the input fields, but it doesn't. Can someone please help me out.
HTML:
My Frontend Framework
Name:
Lastname:
Javascript:
const createState = (stateObj) => {
return new Proxy(stateObj, {
set(target, property, value) {
target[property] = value;
render();
return true;
}
});
};
const state = createState({
name: '',
lastName: ''
});
const listeners = document.querySelectorAll('[bit-data]');
listeners.forEach((element) => {
const name = element.dataset.model;
element.addEventListener('keyup', (event) => {
state[name] = element.value;
console.log(state);
});
});
const render = () => {
const bindings = Array.from(document.querySelectorAll('[bit-data-binding]')).map(
e => e.dataset.binding
);
bindings.forEach((binding) => {
document.querySelector(`[bit-data-binding=${binding}]`).innerHTML = state[binding];
document.querySelector(`[bit-data=${binding}]`).value = state[binding];
});
}
ANSWER
Answered 2021-Dec-15 at 13:37Your main issue is this part:
const bindings = Array.from(document.querySelectorAll('[bit-data-binding]')).map(
e => e.dataset.binding
);
or more specifically e.dataset.binding. Your elements do not a have data-binding attribute, which would be the prerequisite for using dataset.binding. You can use e.getAttribute('bit-data-binding') instead.
But your logic is also flawed: As it currently stands, entering text into an input is pointless, as the state is never updated.
Finally, note that you spell LastName with a capital L in your DOM but lowercased in your state object.
QUESTION
We are a small company, using emberjs as the main frontend framework for our projects. The frontend architect sticks to it like liquid glue sticks to paper, because he doesn't know any other frameworks. The main reason that is forced is the slogan: 'convention over configuration'. And there are reasons like emberjs is faster in larger scale applications. Anyone can reason pro-contra for emberjs, angular, react etc.. (hopefully someone who knows all of them, at least emberjs, and another)? We are having meeting sessions about this, where junior frontend devs try to convince the architect about the other frameworks. In my opinion this should not be a technical issue, all of the frameworks are capable of developing 'larger scale' applications. The real reason should be the recruiting, we would find react/angular devs more easily. Thanks
ANSWER
Answered 2021-Oct-18 at 14:16I was in the same situation and managed to migrate to react+redux toolkit+nextjs.
The way I started my introduction is by explaining what is react. React is a rendering engine. I compared it to glimmer components and ember components. I then explained that most of our components were ember components wich are deprecated and need to be migrated anyway
I then explained that we could just live with ember data, ember cli and react.
Then I showed why ember cli was old and there was this new cool kid embroider that we will need to migrate in the future. I explained what was embroider and how it compared with nextjs. I pointed out that I had experience with react and nextjs but not with embroider.
Then I pitched that Ember Data along with nextjs and react was a viable solution. I also showed that the standard stack with nextjs and react was to use in place of ember data: redux toolkit (you could choose react-query depending on your needs)
At the end of this meeting, people were excited but still had questions. I then had to do different presentations and discussions about architecture and costs. I produced swot analysis, risk analysis, benchmarks on component libraries (we went with zendesk garden), cost of development per feature..
It's a long process but if you take time to discuss. Remove any passion from the discussions and at the end focus on reducing costs, you'll get your migration.. and yeah the fact we were struggling to recruit ember experts helped with my arguments :D
I should write a blog post about that xD
PS: regarding "convention over configuration", you can find this concept applied by nextjs and redux toolkit
QUESTION
Right now I'm building an application where I use Symfony 5.3 as a full stack framework. So I use twig for my views and vanilla javascript. At first this wasn't a big problem but I had to build a few multi step forms and it's starting to be really annoying. Although I'm new to frontend frameworks I want to give ReactJS a try. After some searching I found Symfony's Encore bundle. The only problem that I have is that the hosting server does NOT have NodeJS installed.
Is it possible to use React (with Encore) without node running?
ANSWER
Answered 2021-Sep-18 at 09:18reactjs app is a list of static js and css files that don't require nodejs to be run, but nodejs is required to build react application
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