Category: javascript

I am implementing a payment engine in my online store and I want to obtain the details of the card with which you are paying (payment details). I would like to know if this is possible?

I got a mission that I must do which goes like this:

Write a function that does the following:
it will accept any number of arguments and do console.log on all of them.
Do not use loops.

Example and expected result:

How am I supposed to do something like that without a loop?

I’m using a line graph in Google Chart and there’s just one thing left I need to configure, the hAxis dates.

The dates have 2 days gap only, like Feb 2, Feb 4, Feb 6, Feb 8, and so on, and so it shows 15 dates on the hAxis. I want to widen the gap maybe by 7 days or lessen the number of dates displayed by just 4 dates. How to achieve that? I can’t seem to find the right config for it here: https://developers.google.com/chart/interactive/docs/gallery/linechart.

Here’s my chart: https://jsfiddle.net/r2wxayn8/

google.charts.load('current', {packages: ['corechart', 'line']});
google.charts.setOnLoadCallback(drawBasic);

function drawBasic() {

      var data = new google.visualization.DataTable();
      data.addColumn('date', 'Date');
      data.addColumn('number', 'Price');

      data.addRows([
        [new Date(2022, 1, 1), 0.2500], [new Date(2022, 1, 2), 0.2500],  [new Date(2022, 1, 3), 0.2600],  [new Date(2022, 1, 4), 0.2700],  [new Date(2022, 1, 5), 0.2800],  [new Date(2022, 1, 6), 0.3000],
        [new Date(2022, 1, 7), 0.2900],  [new Date(2022, 1, 8), 0.3300],  [new Date(2022, 1, 9), 0.3100],  [new Date(2022, 1, 10), 0.3200],  [new Date(2022, 1, 11), 0.3200], [new Date(2022, 1, 12), 0.3200],
        [new Date(2022, 1, 13), 0.3100], [new Date(2022, 1, 14), 0.3200], [new Date(2022, 1, 15), 0.3000], [new Date(2022, 1, 16), 0.3100], [new Date(2022, 1, 17), 0.3000], [new Date(2022, 1, 18), 0.3000],
        [new Date(2022, 1, 19), 0.2900], [new Date(2022, 1, 20), 0.2800], [new Date(2022, 1, 21), 0.2700], [new Date(2022, 1, 22), 0.2700], [new Date(2022, 1, 23), 0.2700], [new Date(2022, 1, 24), 0.2600],
        [new Date(2022, 1, 25), 0.2700], [new Date(2022, 1, 26), 0.2600], [new Date(2022, 1, 27), 0.2500], [new Date(2022, 1, 28), 0.2500], [new Date(2022, 1,29), 0.2400], [new Date(2022, 1, 30), 0.2500]
      ]);

      var options = {
          hAxis: {
            gridlines: {
            color: 'none'
            },
            format: 'MMM dd',
                textStyle: {
                color: '#677185',
                    fontSize: 12,
              bold: true
            }
          },
          vAxis: {
            gridlines: {
            color: '#DFE3EB'
            },
            minorGridlines: {
            color: '#DFE3EB'
            },
                textStyle: {
                color: '#677185',
                    fontSize: 12,
              bold: true
            }
          },
            tooltip: {
                textStyle: {
              color: '#677185',
                    fontSize: 12
            }
          },
          series: {
            0: {
            color: '#26a172'
                        }
          },
                    legend: { position: 'none' },
          curveType: 'function'
      };

      var chart = new google.visualization.LineChart(document.getElementById('chart_div'));

      chart.draw(data, options);
    }

I have data that looks like this:

{
  FL: [{ID: 1, confirmed: true},{ID: 2, confirmed: false}], 
  TX: [{ID: 3, confirmed: true}], 
  NY: [{ID: 4, confirmed: false}, {ID: 5, confirmed: true}]
}

And I need to be able to loop over each item in this data find the one
who’s ID === a known ID. I’m not sure the best way to approach this.

The only thing that I can come up with is a for-In loop but Id have to map over the arrays after looping over the object so that doesn’t seem very clean.

Is there any method that is clean for handling iterating over such deeply nested data?

Hello fellow developers,

I’m junior developer and I’m working on a project with big nested object (example bellow) which ideally I want to use as react state that can be accessed from multiple places but I don’t know which approach is best for this solution as I don’t have many experiences yet. If you could give me some advice, code example or link to some tutorial or blog, it would be very helpful.

My current approach (example bellow) is to use useContext without useReducer because I just don’t want to just export dispatch because I think is kinda ugly or not programmer friendly as you always have to define different type and payloads. Maybe I could wrap dispatch it in the functions but I’m just not sure about it. I was also thinking about using Redux, but I don’t use that yet and according to what read that it can be overkill for this.

Thank you in advance.

{
    id: string,
    name: string,
    sections: [{
        id: string,
        pos_x: number,
        pos_y: number,
        rows: number,
        columns: number,
        curvature: number,
        skew: number,
        rotation: number,
        section_type: string,
        name: string,
        seats: [{
            id: string,
            row: number,
            column: number,
            is_disabled: boolean,
            category: string,
            name: string,
            created_at: string,
            updated_at: string,
            is_reserved: boolean,
            reserved_at: string,
            status: string,
            ticket: number
        }],
        total_seats: number,
        created_at: string,
        updated_at: string,
        available_seats: number,
        purchased_seats: number,
        reserved_seats: number
    }],
    creator: number,
    account: number,
    is_editable: boolean,
    total_seats: number,
    created_at: string,
    updated_at: string,
    event: number,
    available_seats: number,
    purchased_seats: number,
    reserved_seats: number
}

import React, {createContext, FC, useState} from 'react';
import {Seat, SeatMap, Section} from "../../types/seatmapData";

type UpdateSelectedSectionProps = (section: Section, seatIndex: number) => Section

export interface ISeatMap {
    id: string,
    name: string,
    sections: Section[],
    creator: number,
    account: number,
    isEditable: boolean,
    totalSeats: number,
    createdAt: string,
    updatedAt: string,
    event: number,
    availableSeats: number,
    purchasedSeats: number,
    reservedSeats: number
}

export interface ISeatMapContext extends ISeatMap {
    setName: (name: string) => void;
    setSections: (section: Section[]) => void;
    setId: (id: string) => void;
    setCreator: (creator: number) => void;
    setAccount: (account: number) => void;
    setIsEditable: (isEditable: boolean) => void;
    setTotalSeats: (totalSeats: number) => void;
    setCreatedAt: (createdAt: string) => void;
    setUpdatedAt: (updatedAt: string) => void;
    setEvent: (event: number) => void;
    setAvailableSeats: (availableSeats: number) => void;
    setPurchasedSeats: (purchasedSeats: number) => void;
    setReservedSeats: (reservedSears: number) => void;
    addSectionToSelected: (section: Section) => void;
    removeSectionsFromSelected: (section: Section) => void;
    clearSelectedSections: () => void;
    addSeatToSelected: (section: Section, seat: Seat) => void;
    removeSeatFromSelected: (section: Section, seat: Seat) => void;
    clearSelectedSeats: () => void;
    addSection: (section: Section) => void;
    removeSection: (section: Section) => void;
    removeSelectedSections: () => void;
    updateSection: (section: Section) => void;
    updateSelectedSeats: (updateFunction: UpdateSelectedSectionProps) => boolean;
    reserveSelectedSeats: (reserved: boolean, reservedAt: Date) => void;
    purchaseSelectedSeat: () => void;
    disableSelectedSeats: (disabled: boolean) => void;
    getSeatMap: () => void;
}

export const SeatMapContext = createContext<ISeatMapContext>(null!);

export interface SeatMapProviderProps extends FC {
    children: any;
    initialValue: SeatMap;
}

const SeatMapProvider = ({ children, initialValue }: SeatMapProviderProps) => {

    const [name, setName] = useState<string>(initialValue.name)
    const [sections, setSections] = useState<Section[]>(initialValue.sections)
    const [id, setId] = useState<string>(initialValue.id)
    const [creator, setCreator] = useState<number>(initialValue.creator)
    const [account, setAccount] = useState<number>(initialValue.account)
    const [isEditable, setIsEditable] = useState<boolean>(initialValue.is_editable)
    const [totalSeats, setTotalSeats] = useState<number>(initialValue.total_seats)
    const [createdAt, setCreatedAt] = useState<string>(initialValue.created_at)
    const [updatedAt, setUpdatedAt] = useState<string>(initialValue.updated_at)
    const [event, setEvent] = useState<number>(initialValue.event)
    const [availableSeats, setAvailableSeats] = useState<number>(initialValue.available_seats)
    const [purchasedSeats, setPurchasedSeats] = useState<number>(initialValue.purchased_seats)
    const [reservedSeats, setReservedSeats] = useState<number>(initialValue.reserved_seats)

    const [selectedSections, setSelectedSections] = useState<Section[]>([]);
    const [selectedSeats, setSelectedSeats] = useState<{section: Section, seat: Seat}[]>([]);

    const addSectionToSelected = (section: Section) => {
        setSelectedSections(prev => [...prev, section])
    }

    const removeSectionsFromSelected = (section: Section) => {
        setSelectedSections(prev => prev.filter(s => s.id === section.id))
    }

    const clearSelectedSections = () => {
        setSelectedSections([])
    }

    const addSeatToSelected = (section: Section, seat: Seat) => {
        setSelectedSeats(prev => [...prev, {section: section, seat: seat}])
    }

    const removeSeatFromSelected = (section: Section, seat: Seat) => {
        setSelectedSeats(prev => prev.filter(s => s.section.id === section.id && s.seat.id == seat.id))
    }

    const clearSelectedSeats = () => {
        setSelectedSeats([])
    }

    const addSection = (section: Section) => {
        setSections(prevState => [...prevState, section])
    }

    const removeSection = (section: Section) => {
        setSections(prevState => prevState.filter(s => s.id == section.id))
    }

    const removeSelectedSections = () => {
        if(selectedSections.length == 0) return

        setSections(prevState => {
            const notSelected: Section[] = []
            prevState.forEach(s => {
                let isSelected = false
                selectedSections.forEach(selected => {
                    if(selected.id == s.id) isSelected = true
                })
                if(!isSelected) notSelected.push(s)
            })
            return notSelected
        })
    }

    const updateSection = (section: Section) => {
        setSections((prevState) => {
            const index = prevState.findIndex(s => s.id === section.id)
            sections[index] = section
            return sections
        })
    }

    const updateSelectedSeats = (updateFunction: UpdateSelectedSectionProps): boolean => {
        if(selectedSections.length == 0 || selectedSeats.length == 0) return false
        const updateTime = new Date().toISOString()
        setSections(sections => {
            selectedSeats.forEach(({section, seat}) => {
                const sectionIndex = sections.findIndex(s => s.id === section.id)
                const seatIndex = sections[sectionIndex].seats.findIndex(s => s.id === seat.id)
                const newSection = updateFunction(sections[sectionIndex], seatIndex);
                sections[sectionIndex] = newSection
                sections[sectionIndex].updated_at = updateTime
            })
            return sections
        })
        setUpdatedAt(updateTime)
        return true
    }

    const reserveSelectedSeats = (reserved: boolean, reservedAt: Date) => {
        const updated = updateSelectedSeats((section, seatIndex) => {
            section.seats[seatIndex].is_reserved = reserved
            section.seats[seatIndex].reserved_at = reservedAt.toISOString()
            return section
        })
        if(updated) setReservedSeats(prev => reserved ? ++prev : --prev)
    }

    const purchaseSelectedSeat = () => {

    }

    const disableSelectedSeats = (disabled: boolean) => {
        const updated = updateSelectedSeats((section, seatIndex) => {
            section.seats[seatIndex].is_disabled = disabled
            if(disabled) section.total_seats--
            else section.total_seats++
            return section
        })
        if(updated) setTotalSeats(prev => disabled ? --prev : ++prev)
    }

    const getSeatMap = (): SeatMap => {
        return {
            name: name,
            sections: sections,
            id: id,
            creator: creator,
            account: account,
            is_editable: isEditable,
            total_seats: totalSeats,
            created_at: createdAt,
            updated_at: updatedAt,
            event: event,
            available_seats: availableSeats,
            purchased_seats: purchasedSeats,
            reserved_seats: reservedSeats,
        }
    }

    return (
        <SeatMapContext.Provider value={{
            name, setName,
            sections, setSections,
            id, setId,
            creator, setCreator,
            account, setAccount,
            isEditable, setIsEditable,
            totalSeats, setTotalSeats,
            createdAt, setCreatedAt,
            updatedAt, setUpdatedAt,
            event, setEvent,
            availableSeats, setAvailableSeats,
            purchasedSeats, setPurchasedSeats,
            reservedSeats, setReservedSeats,
            addSectionToSelected,
            addSeatToSelected,
            clearSelectedSeats,
            clearSelectedSections,
            purchaseSelectedSeat,
            removeSeatFromSelected,
            removeSectionsFromSelected,
            getSeatMap,
            addSection,
            removeSection,
            updateSection,
            removeSelectedSections,
            updateSelectedSeats,
            reserveSelectedSeats,
            disableSelectedSeats
        }}>
            {children}
        </SeatMapContext.Provider>
    )
};

export default SeatMapProvider;

My vs code power-shell doesn’t recognize my command … but cmd works just fine … What is the problem ? … i am currently working on a react js project and i am install npm and yarn then i face these problem… so how can i solve it as soon as possible or i freshly install node and others thing

I have a function to execute a process:

static async runTest() { await process.exec(`start ${currentDir}/forward.py`); }

runTest();

The python script will continue to run until it’s killed, which I don’t know how to do at the moment. So in short, I want to kill this process manually at some point. How I would I do this? Thank you!

I’ve noticed when pushing to an array that has been passed to a child component as prop, I don’t get the usual ‘Avoid mutating a prop directly’ error. After thinking about it, this makes sense because the array is a reference and if something causes the parent to re-render, the child will render correctly because of this.

Is the proper approach still to emit to the parent and have the parent operate on the array, or is it perfectly valid to operate on the array in the child component since it is a reference?

I’m fetching a list that I’m trying to loop through that has an object inside. I’m using vue and the array looks like this:

companies: [
  name: "company1"
  id: 1
  type: "finance"
  additionalData: "{"funder":"blabla","idType":5,"number":"2"}"
]

My problem is accessing the different ones inside the additionalData.

This is how far I’ve come:

        <div
            v-for="(company, idx) in companies"
            :key="idx"
        >
          <p class="font-weight-bold text-h6"> {{ company.name }} </p>
          <p class="font-weight-bold"> {{ company.additionalData.funder }} </p>
        </div>

This doesn’t work and I’ve tried a loop inside the loop aswell. When I only print out {{ company.additionalData }} I get the whole object. Can it have something to do with that the object is inside a string? Could I do a computed or something to figure this out or? 🙂

I want to be able to reserve 2 or more characters in a string. For example:

let string = "  "
string.unknownMethod("a")

What function do I need in place of unknown method to get this output " a". But if string.unknownMethod("ab") the output should be "ab"

var table = $('#mytable').DataTable({
      'columnDefs': [{
         'targets': 0,
         'searchable': false,
         'orderable': false,
         'className': 'checkbox check-success'  
      }],
      'order': [[1, 'asc']]
   });

                                                                <div class="checkbox check-success">

                                                                    <label class=" mt-checkbox mt-checkbox-outline"
                                                                        for="checkbox_<?php echo $valuep['0'] ;?>">
                                                                        <input id="checkbox_<?php echo $valuep['0'] ;?>" type="checkbox" name="leads_ids" value="<?php echo $valuep['0'] ;?>" class="select_click">
                                                                        <span></span>
                                                                    </label>
                                                                    <input type="hidden" id="enable_all"
                                                                        name="enable_all" value="1">
                                                                    <input type="hidden" id="lead_contact_id_<?php echo $valuep['0'] ;?>"
                                                                        name="contact_id" value="<?php echo $valuep['0'] ;?>">

                                                                </div>
                                                                <span id="custom_controls"></span>
                                                            </td>

Whenever I click on select-all on top of table it gets back to first page.I need to select some rows in table and export it to csv but when selecting on different pages when i click on select all it gets back to page 1.

I have a table/Div like the one below, and the data is generated dynamically in real time so the rows keep coming and changing.

The table is floating on my browser, I dont have control over the source website so I cannot use jquery to modify the table. I can ONLY use javascript, (by using the browser extension) to alter the DOM.

I need the javascript code that can:

• sort the table by the date and time – newest on top
• highlight rows that have the word: “blocked”
• hide rows that have the word: “unknown” (but make the rows appear when the content is changed to something else)
• keep sorting when timeCell or descriptionCell is updated in any row (or maybe run the sorting every 30 seconds)

I am not familiar with the modern JS code but I think that the date time can be changed to unix timestamp so it make the sorting easier.

I tried to use Chrome browser extension called: Javascript Injector and some javascript code that uses const, i.e: const tabledoc = document;

But when I click the update button of the extension, it will show me some error that says tabledoc is already defined.

Can you please help me?

<div class="container-QqYJdG">

<div class="wrapper-QqYJdG">
  <div class="bodyRow-3OfxA">
    <div class="cell-3OfxA symbolCell-3OfxA">
      <div class="Name-3OfxA">MacKenzi</div>
    </div>
    <div class="cell-3OfxA descriptionCell-3OfxA">visited</div>
    <div class="cell-3OfxA timeCell-3OfxA"><span>1/11/2022</span><span>1:59:08 PM</span></div>
  </div>
  <div class="bodyRow-3OfxA">
    <div class="cell-3OfxA symbolCell-3OfxA">
      <div class="Name-3OfxA">Sophia</div>
    </div>
    <div class="cell-3OfxA descriptionCell-3OfxA">visited</div>
    <div class="cell-3OfxA timeCell-3OfxA"><span>1/11/2022</span><span>12:10:00 AM</span></div>
  </div>
  <div class="bodyRow-3OfxA">
    <div class="cell-3OfxA symbolCell-3OfxA">
      <div class="Name-3OfxA">Luc</div>
    </div>
    <div class="cell-3OfxA descriptionCell-3OfxA">visited</div>
    <div class="cell-3OfxA timeCell-3OfxA"><span>1/11/2022</span><span>12:40:02 AM</span></div>
  </div>

    <div class="bodyRow-3OfxA">
    <div class="cell-3OfxA symbolCell-3OfxA">
      <div class="Name-3OfxA">Daniel</div>
    </div>
    <div class="cell-3OfxA descriptionCell-3OfxA">status: unknown</div>
    <div class="cell-3OfxA timeCell-3OfxA"><span>1/11/2022</span><span>12:32:02 AM</span></div>
  </div>

    <div class="bodyRow-3OfxA">
    <div class="cell-3OfxA symbolCell-3OfxA">
      <div class="Name-3OfxA">Michael</div>
    </div>
    <div class="cell-3OfxA descriptionCell-3OfxA">is blocked</div>
    <div class="cell-3OfxA timeCell-3OfxA"><span>1/11/2022</span><span>12:49:02 AM</span></div>
  </div>

  <div class="bodyRow-3OfxA">
    <div class="cell-3OfxA symbolCell-3OfxA">
      <div class="Name-3OfxA">Vova</div>
    </div>
    <div class="cell-3OfxA descriptionCell-3OfxA">visited</div>
    <div class="cell-3OfxA timeCell-3OfxA"><span>1/11/2022</span><span>3:02:01 PM</span></div>
  </div>
</div>

</div>

I’m new to learning react so I followed this tutorial https://developer.mozilla.org/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_components to create a todo app and then tweaked it to fit the requirements of the project I’m working on. Everything works the way it should except when I delete (complete) things from the associate side, it also deletes it from my main side as well. I understand the general concept of why that’s happening (I don’t have two separate lists in my code), just not sure how to go about fixing it without removing the filter I have in place. I had tried to implement a separate list for those tasks but just wasn’t understanding how to go about it.

App.js

const FILTER_MAP = {
  All: () => true,
  Associate: task => task.checked 
};
const FILTER_NAMES = Object.keys(FILTER_MAP);

function App(props) {

  const [tasks, setTasks] = useState(props.tasks);
  const [filter, setFilter] = useState('All');

  function toggleTaskChecked(id) {
    const updatedTasks = tasks.map(task => {
      if (id === task.id) {
        return {...task, checked: !task.checked}
      }
      return task;
    });
    setTasks(updatedTasks);
  }

  function completeTask(id) {
    const remainingTasks = tasks.filter(task => id !== task.id);
    setTasks(remainingTasks);
  }

  const taskList = tasks
    .filter(FILTER_MAP[filter])
    .map(task => (
      <Todo
        id={task.id}
        name={task.name}
        checked={task.checked}
        key={task.id}
        toggleTaskChecked={toggleTaskChecked}
        completeTask={completeTask}
      />
    ));

  const filterList = FILTER_NAMES.map(name => (
    <FilterButton
    key={name}
    name={name}
    isPressed={name === filter}
    setFilter={setFilter}
  />
  ));

  function addTask(name) {
    const newTask = { id: "todo-" + nanoid(), name: name, checked: false };
    setTasks([...tasks, newTask]);
  }

  return (
    <div className="app">
      <h1 className = "tasks-header">Task Tracker</h1>
      <Form addTask={addTask}/>
      <div className="list-buttons">
        {filterList}
      </div>
      <ul
        role="list"
        className="todo-list"
        aria-labelledby="list-heading"
      >
        {taskList}
      </ul>
    </div>
  );

}

export default App

Todo.js

export default function Todo(props) {

  return (
    <li className="todo stack-small">
      <div className="c-cb">
        <input id={props.id} 
        type="checkbox" 
        defaultChecked={props.checked}
        onChange={() => props.toggleTaskChecked(props.id)} 
        />
        <label className="todo-label" htmlFor="todo-0">
          {props.name}
        </label>
      </div>
      <div className="btn-group">
        <button type="button" 
        className="complete-button"
        onClick={() => props.completeTask(props.id)}
        >
          Complete 
        </button>
      </div>
    </li>
  );
  }

index.js

const DATA = [
  { id: "todo-0", name: "Brush Teeth", checked: false },
  { id: "todo-1", name: "Make Dinner", checked: false },
  { id: "todo-2", name: "Walk Dog", checked: false },
  { id: "todo-3", name: "Run Reports", checked: false },
  { id: "todo-4", name: "Visit Mom", checked: false },
  { id: "todo-5", name: "Aerobics", checked: false },
  { id: "todo-6", name: "Project", checked: false },
  { id: "todo-7", name: "Lecture", checked: false },
  { id: "todo-8", name: "Have Lunch", checked: false }
];

ReactDOM.render(
  <React.StrictMode>
    <App tasks={DATA}/>
  </React.StrictMode>,
  document.getElementById('root')
);

FilterButton.js

function FilterButton(props) {
    return (
      <button
        type="button"
        className="toggle-btn"
        aria-pressed={props.isPressed}
        onClick={() => props.setFilter(props.name)}
      >
        <span className="visually-hidden">Show </span>
        <span>{props.name}</span>
        <span className="visually-hidden"> Tasks</span>
      </button>
    );
  }

export default FilterButton;

i want to update a list of field data with formik.
i have this validation

validationSchema: Yup.object().shape({
      password: Yup.string()
        .min(4, 'Password must be at least 4 characters.')
        .required('Password must be at least 4 characters.'),
      ....
    }),

i want the user to be able to set password at least a length of 4 and if the user does not enter password then submit as empty string.
password component

<FormControl
              fullWidth
              error={Boolean(formik.touched.password && formik.errors.password)}
              variant="outlined"
            >
              <InputLabel htmlFor="password">Password</InputLabel>
              <OutlinedInput
                id="password"
                name="password"
                inputProps={{
                  autoComplete: 'password',
                  form: {
                    autoComplete: 'off',
                  },
                }}
                type={showPassword ? 'text' : 'password'}
                onBlur={formik.handleBlur}
                onChange={formik.handleChange}
                value={formik.values.password}
                endAdornment={
                  <InputAdornment position="end">
                    <IconButton
                      aria-label="toggle password visibility"
                      onClick={() => setShowPassword(!showPassword)}
                      onMouseDown={(event) => event.preventDefault()}
                      edge="end"
                    >
                      {showPassword ? <VisibilityOff /> : <Visibility />}
                    </IconButton>
                  </InputAdornment>
                }
                label="Password"
              />
              {formik.errors.password && <FormHelperText>{formik.errors.password}</FormHelperText>}
            </FormControl>

but with this code, if the password field is touched but not entered any password formik is not letting to submit the data. how can I do that? thank u in advance.

Is there anyway to connect to a web server of node js from another computer that connected to same wifi?
i searched i get these results:
Connect to localhost:3000 from another computer | expressjs, nodejs
but all didnt worked can you help me? thanks