Category: javascript

I have this simple Atlassian component (https://atlassian.design/components/textfield/examples):

  <Textfield
      type="number"
      onChange={onChangeWrapped}
  />

And this is what it’s look like in UI

As you may see there is a comma for non-integers, but I need a period there in any OS and browser.

Well, I have a function which hides or shows a html element:

function myFunction(show) {
  if (show) {
    foo.show()
  } else {
    foo.hide()
  }
}

Is there a cool way to name myFunction and the variable it takes?

destructuring assignment doesn’t work for the field in one object holds a falsy value, as follow:

let { aaa = 123 } = { aaa: null }
console.log(aaa) // null

so, how to achive ||= in object destructuring assignment to implement such the field’s destructed defalut value ? like this:

let { aaa ||= 123 } = { aaa: null }
console.log(aaa) // 123

// it equals to
// let aaa = ({ aaa: null }).aaa || 123

On page change or reload or close, react-router-dom prompt is displaying; however, in my page I am using Material UI tabs and I want the prompt to display on tab change as well.

This is the code for my prompt.

    <Prompt
      when={valueChanged}
      message={"Are you sure you want to leave?"}
    />

The prompt only displays if I change in the route or close the browser or reload, but how can I make it display without having to change the route (when a change happens on the same page).

In python I can write a statement like this.

if(direction not in [i[1] for i in openlist]):

What is the javascript equivalent?

I am using the solana candy-machine for minting the nft.

When i call smart contract function in javascript

import * as anchor from "@project-serum/anchor";

let program = new anchor.Program(idl, programId, provider);
let result = await program.rpc.someFunc(); //here is the smart contract function

browser will show pop up for you to approve the transaction.
is There any way to know if user click cancel or approve?

In ethereum, it has something like below:

          .on("transactionHash", function(hash) {
                …
          })
          .on("error", function(error, receipt) {
        …
          });

is it possible to do it in candy machine? I want to do something after user click approved in transaction

In the same page i have multiple section.

One section will be show and this will happen using a class active.

In the same page i have li buttons 1, 2 and 3 when i click on one of them the section related appear and the old one disappear for that i’m using javascript to do it.

Also in the same page i have a next and previous button when i click on the next button i should appear the next section and disapear the old one.

And also the relate li to the section should have the class active the same thing for the previous when i click on it i should go to the old section and disappear the current one and the li number should be active.

And when i’m in the first section the previous button should be disapear and when i’m in the last section the next button should be disapear

How can i do the next and previous buttons in this way using javascrip?

let tab = document.querySelector(".nav li");
let tabs = document.querySelectorAll(".nav li");
let tabsArray = Array.from(tabs);
let section = document.querySelectorAll(".section");
let sectionArray = Array.from(section);
let nextButton = document.querySelector(".btn-next");
let prevButton = document.querySelector(".btn-prev");
let current = 0;

tabsArray.forEach((ele) => {
    ele.addEventListener("click", function (e) {
        tabsArray.forEach((ele) => {
            ele.classList.remove("active");
        });
        e.currentTarget.classList.add("active");
        
        sectionArray.forEach((sec) => {
            sec.classList.remove("active");
        });
        document.querySelector('#' + e.currentTarget.dataset.cont).classList.add("active");
    });
});

.section {
display: none;
}

.section.active{
display: block;
}

ul {
list-style: none;
margin:0;
padding: 0;
display: flex;
align-items: center;
}

ul li {
background: #ccc;
padding: 10px 15px;
margin-left: 6px;
border-radius: 50%;
cursor: pointer;
opacity: .5;
}

ul li.active{
opacity: 1 !important;
}

.next,
.previous {
padding: 15px 10px;
border-radius: 6px;
background: deepskyblue;
color: white;
border:0;
outline: none;
cursor: pointer;
width: 100px;
}

<ul class="nav">
<li class="active" data-cont="r1">1</li>
<li data-cont="r2">2</li>
<li data-cont="r3">3</li>
</ul>


<section id="r1" class="section section-one active">
<h2>section 1</h2>
</section>
<section id="r2" class="section section-two">
<h2>section 2</h2>
</section>
<section id="r3" class="section section-three">
<h2>section 3</h2>
</section>

<button class="next" id="next">Next</button>
<button class="previous" id="previous">Previous</button>

I have 2 arrays inside data.js which looks like this-

I have another file test.js where I want to import data.js as module like this –

const data = require('./data.js')

and then access each array in this format-

data.girlsDataWeightAge[0]
data.boysDataWeightAge[0]

currently I am exporting each array like this –

export const NameOfArray= []

amd importing each array separately like this-

 import {girlsDataWeightAge} from './data.js';
 import {girlsDataWeightAge} from './data.js';

but I dont want to import them separately because I am going to pass the data through some functions and need to access it only the way I have specified above.

I am working on a project that creates a web extension. Normally, I write my code with ts.
I want to add my js file in my project. I am getting an error “only amd and system modules aare supported alongside –outfile”

{
  "compilerOptions": {
    "jsx": "react",
    "module": "es6",
    "target": "es6",
    "moduleResolution": "node",
    "esModuleInterop": true,
    "outDir": "./dist",
    "allowJs": true,

    "outFile": "./dist/background.js"
  },
  "include": ["src/**/.ts", "src/**/*.tsx"],
  "exclude": ["node_modules"]
}

I am trying to get only keys from the object, but I am getting 0 1 2 3 as output.

Below is my code

data = {"property" : "{"animalID": "12345", "animalNumber" : "789", "type" : "mamal"}

onCLick() {
  const dataOne = (JSON.parse(JSON.stringify(this.data)));
  console.log("data", Object.keys(dataOne.property));
}

Below is the current output, which is wrong.

data (61) ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23', '24', '25', '26', '27', '28', '29', '30', '31', '32', '33', '34', '35', '36', '37', '38', '39', '40', '41', '42', '43', '44', '45', '46', '47', '48', '49', '50', '51', '52', '53', '54', '55', '56', '57', '58', '59', '60']

Trying to achieve something like this

const object1 = {
  a: 'somestring',
  b: 42,
  c: false
};

console.log(Object.keys(object1));
// expected output: Array ["a", "b", "c"]

I’m just asking this question to clarify and get a better understanding at javascript promises. The following two codes look very similar to me, but why both gives different results. Also how to get the result of async/await function in .then way. Thanks.

async/await

const getFieldValue = async (collection, userid) => {
  let response;

  const querySnapshot = await firestore()
    .collection(collection)
    .where("userid", "==", userid)
    .get();
  querySnapshot.forEach((doc) => {
    const { name } = doc.data();
    response = name;
  });

  return response;
};

async function fetchData() {
  const name = await getFieldValue("Users", userid);
  console.log("name", name);
}
fetchData();

.then

const getFieldValue = (collection, userid) => {
  let response;

  firestore()
    .collection(collection)
    .where("userid", "==", userid)
    .get()
    .then((querySnapshot) => {
      querySnapshot.docs.find((doc) => {
        const { name } = doc.data();
        response = name;
      });
    })
    .catch((e) => console.log(e));

  return response;
};

const name = getFieldValue("Users", userid);
console.log("name", name);

async/await returns correct name and .then returns undefined

How can i handle image before adding file in filepond? I want something like this:

pond.on('beforeadd', (file) => {
    const newFile = addWatermark(file);
    return newFile;
});

I know i can do this with transform plugin but it is firing only while image is processing. I want to add edited file directly preview.

svg it is rendered perfectly in HTML, but when I download it is not rendering properly. why?

in html

in PDF

Code

function saveAsPDF() {
            var element = document.getElementById('printableArea');
            var opt = {
                margin: 0.3,
                filename: 'download.pdf',
                image: {type: 'jpeg', quality: 1},
                html2canvas: {scale: 4, dpi: 72, letterRendering: true},
                jsPDF: {unit: 'in', format: 'A2'},
                html2canvas: {
                    onclone: (element) => {
                        const svgElements = Array.from(element.querySelectorAll('svg'));
                        svgElements.forEach(s => {
                            const bBox = s.getBBox();
                            s.setAttribute("x", bBox.x);
                            s.setAttribute("y", bBox.y);
                            s.setAttribute("width", bBox.width);
                            s.setAttribute("height", bBox.height);
                        })
                    }
                }
            };
            html2pdf().set(opt).from(element).save();
        }
        

in this paper: https://ieeexplore.ieee.org/document/7958598, the authors said that javascript is crash-safe and type-safe. they said crash-safe means it will never hard crash. what is the difference of crash and hard crash in javascript? what does hard crash mean in javascript? why javascript is crash-safe?
also in javascript 2+”2″ can be done without any trouble. so why javascript is type-safe? I always know javascript as type-unsafe?

Hey im trying to build a simple inventory program. I have class like this :

    <?php
    class category
    {
    public static $catoptSupplies=array(
        "Cleaning Supplies",
        "Guest Supplies",
        "Printing Supplies"
        );
    public static function loopcat3()
        {
            $loop3=category::$catoptSupplies;
            $spnum=1;
            foreach ($loop3 as $prnloop3) 
            {   
                echo "<option value='spcat$spnum'>$prnloop3</option>";
                $spnum++;

            }
        }

    }

?>

now i want to append rows in my table which contain select option like this:

 <script>
    $(document).ready(function(){
        var count=1;
        $('#addMsGDRow').click( function(){
            count = count+1;
            var addMsGDRow ='<tr id="row'+count+'">
                                    <td>
                                        <select style="font-size: 12px; width: 83%; text-align: center;">
                                            <option>--Choose Category--</option>
                                            <?php echo category::loopcat3(); ?>
                                        </select>
                                    </td>
                                    <td>
                                        <select style="font-size: 12px;  text-align: center;">
                                            <option>Unit</option>
                                            <option>Meter</option>
                                            <option>Pcs</option>
                                        </select>
                                    </td>
                                    <td><input type="text" name="" style="width: 70px;"></td>
                                    <td><input type="text" name="" style="width: 140px;"></td>
                                    <td>
                                        <textarea style="width: 121px; height: 43px;"></textarea>
                                    </td>
                           <td><input type="number" name="" style="width: 75px;" min="0"></td>
                           <td><input type="number" name="" min="0" style="width: 100px;"></td>
                           <td><input type="number" name="" min="0" style="width:140px;"></td>
                           <td><button type="button" name="remove" data-row="row'+count+'" class="btn btn-danger btn-xs removemsgd">-</button></td>
                                </tr>';
            $('#tableMsGoods').append(addMsGDRow);
        });
        $(document).on('click', '.removemsgd', function(){

          var delete_row=$(this).data("row");
          $('#'+delete_row).remove();

      }); 
    });
</script>

but new row wont added if call my class using normal php line. It does however add a new row if i remove the php line. So, how can i call my class in jquery ?