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How to encapsulate javascript with repetitive functions into reusable components?

I'm a javascript novice, and I have a problem that bothers me~
I often need to write a function to click a button to pop up a modal. The interaction logic of this function is repeated, but sometimes the UI or copywriting needs to be adjusted~
So I want to know How can such a repetitive function be packaged into a component, and other pages need to use modal-like functions in the future, which can be directly referenced and only need to change the copy without rewriting CSS / HTML / JavaScript?
// 匯出 excel 彈窗 JS
$("*[data-modal]").on("click", Modeal);
function Modeal() {
$(".excel_popup").css("display", "flex");
$("body").css("overflow", "hidden");
// 關閉彈窗
$(document).on("click", function(e) {
if (
e.target.className == "close" ||
e.target.className == "excel_popup" ||
e.target.className == "btn_confirm" ||
e.target.className == "btn_consider"
) {
$("#js-job_excel_popup").css("display", "none");
$("body").css("overflow", "auto");
}
});
}
.excel_popup {
position: fixed;
z-index: 999999999;
width: 100%;
height: 100vh;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: auto;
background-color: rgba(0, 0, 0, 0.3);
justify-content: center;
align-items: center;
display: none;
}
.excel_popup .excel_close_wrap {
width: 360px;
background-color: #fff;
padding: 16px 24px;
border-radius: 8px;
margin: 0 8px;
}
.excel_popup .excel_close_wrap header {
position: relative;
width: 100%;
display: flex;
justify-content: center;
align-items: center;
border-bottom: 1px solid #222;
padding-bottom: 16px;
}
.excel_popup .excel_close_wrap header h2 {
font-size: 18px;
line-height: 1.5;
font-weight: 500;
text-align: center;
}
.excel_popup .excel_close_wrap header .close {
position: absolute;
right: 0;
display: inline-block;
width: 20px;
height: 20px;
background-repeat: no-repeat;
background-size: contain;
cursor: pointer;
}
.excel_popup .excel_close_wrap .txt {
font-size: 16px;
font-weight: 400;
line-height: 1.5;
text-align: center;
padding: 32px 0px;
color: #222;
}
.excel_popup .excel_close_wrap .btn_group {
display: flex;
justify-content: space-between;
font-size: 14px;
line-height: 1.5;
letter-spacing: 0.15px;
}
.excel_popup .excel_close_wrap .btn_group .btn_consider {
width: 132px;
text-align: center;
padding: 8px;
border-radius: 4px;
border: 1px solid #222;
margin-right: 4px;
cursor: pointer;
}
.excel_popup .excel_close_wrap .btn_group .btn_consider:hover {
border: 1px solid #222;
}
.excel_popup .excel_close_wrap .btn_group .btn_confirm {
width: 132px;
text-align: center;
padding: 8px;
border-radius: 4px;
border: 1px solid #222;
background-color: #222;
margin-left: 4px;
cursor: pointer;
color: #fff;
}
.excel_popup .excel_close_wrap .btn_group .btn_confirm:hover {
background-color: yellow;
border: 1px solid #222;
color: #222;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a class="excel_export" id="js-excel_export" href="javascript:;" data-modal="js-job_excel_popup">
<figure></figure>
<p>Click the popup</p>
</a>
<div class="excel_popup" id="js-job_excel_popup">
<div class="excel_close_wrap">
<header>
<h2>TITLE</h2>
<div class="close" id="js-close"></div>
</header>
<p class="txt">Hello World!!!</p>
<div class="btn_group">
<a class="btn_consider">Cancel</a>
<a class="btn_confirm">Send</a>
</div>
</div>
</div>

Is there a way to verticaly occupy all the space of the flexbox container?

I want the search button to occupy all the space vertically
I have tried setting the height to 100% of the parent container but not working, I have tried setting the flex-basis to 100%/0/auto (not working). Look at my Code below and see the picture of the btn beside the input.
I want that btn to gain the height equal to the height of the input
See the Problem here
My Html:
<div className="search_subContainer">
<input
className="searchCity"
type="text"
value={value}
placeholder="Search city..."
onFocus={() => {
setFocus(!focus);
}}
onBlur={() => {
setFocus(!focus);
}}
onChange={handleChange}
/>
<button className="search_btn">
<IoSearch />
</button>
</div>
My Css:
.header .search_subContainer {
display: flex;
align-items: center;
align-content: stretch;
height: 100%;
border: 2px solid brown;
border-radius: 5px;
}
.header .searchCity {
width: 17em;
height: 100%;
padding: 0.3em 0.5em;
font-size: 0.9rem;
border: none;
outline: none;
background-color: rgba(255, 255, 255, 0.377);
font-family: var(--secondary-font);
border-top-left-radius: 5px;
border-bottom-left-radius: 5px;
}
.header .searchCity:focus {
background-color: rgba(255, 255, 255, 0.719);
}
.search_btn {
width: 3em;
flex: 1;
height: 100%;
background-color: brown;
border: none;
font-size: 0.9rem;
border-top-right-radius: 1px;
border-bottom-right-radius: 1px;
cursor: pointer;
}
.search_btn:hover {
background-color: cadetblue;
}

The culprit is caused by align-items: center. Adding that to a flex container with a direction of row aligns the flex children to the center vertically.
To fix this, remove that line and the search button should align with the input element.
Fix
.search_subContainer {
display: flex;
border: 2px solid brown;
border-radius: 5px;
}
Doing this also means no need to add a height and flex: 1 to the input container, input element, and button itself.
So
.search_btn {
width: 3em;
background-color: brown;
border: none;
font-size: 0.9rem;
border-top-right-radius: 1px;
border-bottom-right-radius: 1px;
cursor: pointer;
}
.searchCity {
width: 17em;
padding: 0.3em 0.5em;
font-size: 0.9rem;
border: none;
outline: none;
background-color: rgba(255, 255, 255, 0.377);
font-family: var(--secondary-font);
border-top-left-radius: 5px;
border-bottom-left-radius: 5px;
}

Just remove align-items: center; for container and container become stretch. Then you can align the icon inside the button using flex. It's the simplest and correct way, IMHO.

There Your go:
please avoid explicit height and width
simple:
body{
display: flex;
align-items: center;
justify-content: center;
height: 100vh
}
.header{
padding: .5rem 1rem;
display: flex;
align-items: center;
justify-content: space-between;
width: 100%;
border: 2px solid black;
}
.search-bar {
padding: 10px;
border: 1px solid lightgray;
margin-left: -5px;
}
.search-bar::placeholder {
color: black;
}
.submit-btn {
background-color: blue;
color: white;
padding: 11px;
font-size: 12px;
border-style: none;
margin-left: -5px;
}
<div class="header">
<div>
<a href='/'>tanjiro</a>
</div>
<div>
<input type="search" placeholder="Awesome" class="search-bar">
<button type="button" class="submit-btn">Search</button>
</div>
</div>

remove border bottom of last element

There is one popup. Selected installments are displayed in this pop-up. The user can choose as many installments as he/she wants. Selected installments have a border bottom. But I don't want the last item to be border bottom. I tried many ways but failed.
html
<div className="installmentinfo__container only-desktop">
<div className="installmentinfo">
<div className="column">
<div className="installmentnumber" >{(i + 1).toString()}</div>
<div className="installmentdate">{billDate}</div>
<div className="installmentamount">{e.amount} {e.currency}</div>
</div>
</div>
</div>
css
.installmentinfo__container.only-desktop {
border: 1px solid #d1d1d1;
border-radius: 10px;
max-width: 300px;
box-shadow: 2px 2px 4px 4px #d1d1d1;
position: absolute;
background-color: white;
top: 210px;
margin: auto;
transform: translateX(-280px);
padding: 0.3em;
z-index: 999;
.installmentinfo {
width: 280px;
height: auto;
padding: 0em 1em;
.column {
display: flex;
margin: 5px;
justify-content: space-between;
font-size: 1.3rem;
border-bottom: 1.5px solid #d1d1d1;
padding-bottom: 5px;
}
.installmentnumber {
float: left;
}
.installmentdate {
width: 50%;
color: black !important;
}
.installmentamount {
width: 50%;
color: black !important;
font-weight: 1000;
}
}
}
What i tried;
.column:last-child{
border-bottom: none;
}
.last-child{
border-bottom: none;
}
&:last-of-type {
border-bottom: none;
}

Use the last-of-type pseudo selector to remove the last item style
.column > div:last-of-type {
border-bottom:none;
}
For More Details https://developer.mozilla.org/en-US/docs/Web/CSS/:last-of-type

psuedo-lastchild is not the last child of a parent container rather last child of a class.so what i did was gave all three segments a same class of segments for targeting the border side of the css and id for other css that was different from each other.
.installmentinfo__container.only-desktop {
border: 1px solid #d1d1d1;
border-radius: 10px;
max-width: 300px;
box-shadow: 2px 2px 4px 4px #d1d1d1;
/* position: absolute; */
background-color: white;
/* top: 210px; */
margin: auto;
/* transform: translateX(-280px); */
padding: 0.3em;
z-index: 999;
}
.installmentinfo {
width: 280px;
height: auto;
padding: 0em 1em;
}
.column {
display: flex;
flex-direction: column;
margin: 5px;
justify-content: space-between;
font-size: 1.3rem;
/* border-bottom: 1.5px solid #d1d1d1; */
padding-bottom: 5px;
}
#installmentnumber {
float: left;
width: 50%;
}
#installmentdate {
width: 50%;
color: black !important;
}
#installmentamount {
width: 80%;
color: black !important;
font-weight: 100;
}
.segments{
border-bottom: 1.5px solid #d1d1d1;
}
.segments:last-child{
border-bottom: none;
}
<body>
<div class="installmentinfo__container only-desktop">
<div class="installmentinfo">
<div class="column">
<div class="segments" id="installmentnumber" >{(i+1).toString()}</div>
<div class="segments" id="installmentdate">{billDate}</div>
<div class="segments" id="installmentamount">{e.amount}{e.currency}</div>
</div>
</div>
</div>
</body>

In your snippet your are giving border bottom to .column class and then you are try to overwrite it with border none with :last-child selector instead you can do like this,
If your are thinking about repeating .column div then you can use following snippet
.column:not(:last-of-type){
display: flex;
margin: 5px;
justify-content: space-between;
font-size: 1.3rem;
border-bottom: 1.5px solid #d1d1d1;
padding-bottom: 5px;
}
In can you want to repeat .installmentinfo div multiple times and you want to give border bottom to column when .installmentinfo isn't a last div then you can use following snippet
.installmentinfo:not(:last-of-type) .column{
display: flex;
margin: 5px;
justify-content: space-between;
font-size: 1.3rem;
border-bottom: 1.5px solid #d1d1d1;
padding-bottom: 5px;
}

Is it possible to display respective country flag to out side of the select function. Or Can we display country flag on the both place

function onChangeCallback(ctr) {
console.log("The country was changed: " + ctr);
//$("#selectionSpan").text(ctr);
}
$(document).ready(function() {
$(".niceCountryInputSelector").each(function(i, e) {
new NiceCountryInput(e).init();
});
});
.container {
margin: 80px auto !important;
padding: 15px;
}
.bg-box1 {
background-color: #E8E8E8;
padding: 30px;
/* width: 460px;*/
width: 700px;
box-shadow: 3px 3px 5px #808080;
border-radius: 6px;
}
.bg-box {
box-shadow: 1px 1px 3px #484848;
border-radius: 6px;
}
select {
border-radius: 6px;
}
.search {
src: url(img/search.png);
}
.niceCountryInputMenu {
background: white !important;
color: black !important;
border: 1px solid #a8a8a8;
cursor: pointer;
border-radius: 4px;
box-shadow: 1px 1px 3px #808080
/*
font-family: Arial;
font-size: 12px;
*/
}
.niceCountryInputMenuDefaultText {
width: 270px;
padding: 6px;
margin: 6px 0px 0px 15px;
display: inline-block;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
font-size: 1.1rem;
}
.niceCountryInputMenuDefaultText a:hover {
text-decoration: none;
}
.niceCountryInputMenu a {
color: #787878 !important;
}
.niceCountryInputMenuDropdown {
/*border-left: 1px solid #a8a8a8;*/
height: 30px;
width: 25px;
float: right;
line-height: 30px;
padding: 8px;
text-align: center;
position: relative;
right: 0;
color: #484848;
}
.niceCountryInputMenuDropdownContent {
border: 1px solid #a8a8a8;
background-color: #fff;
font-size: 1.1rem;
border-top: 0;
max-height: 200px;
overflow-y: scroll;
overflow-x: hidden;
}
.niceCountryInputMenuDropdownContent a {
height: 40px;
line-height: 40px;
display: block;
width: 100%;
color: #787878 !important;
overflow: hidden;
text-decoration: none;
border: 1px solid #F5F5F5;
/*
font-family: Arial;
font-size: 12px;
*/
}
.niceCountryInputMenuDropdownContent a:hover {
background-color: #63a2d7 !important;
color: white !important;
text-decoration: none;
}
.niceCountryInputMenuFilter {
border: 1px solid #a8a8a8;
border-top: -10;
border-bottom: 0;
}
.niceCountryInputMenuFilter input {
width: 100%;
width: calc(100% - 10px);
margin: 5px;
padding: 10px;
border: 1px solid #ccc;
outline: none;
border-radius: 6px;
font-size: 1.1rem;
color: #808080;
}
.niceCountryInputMenuCountryFlag {
border: 1px solid #d3d3d3;
width: 23px;
height: 18px;
margin-left: 5px;
margin-right: 5px;
}
.niceCountryInputMenuCountryNoFlag {
display: inline-block;
border: 1px solid black;
background: white;
color: black;
line-height: 15px;
text-align: center;
width: 22px;
margin-left: 5px;
margin-right: 5px;
font-size: 13px;
}
<script src="https://manishasecurity.in/creative-js/niceCountryInput.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.1.0/dist/css/bootstrap.min.css" rel="stylesheet"/>
<div class="container">
<h3>Select a Country:</h3>
<div class="bg-box1">
<div class="row">
<div class="col-4">
<div style="background-color: #fff; width: 160px; height: 50px;margin-top: 0px; padding: 4px; border-radius: 6px;font-size: 12px;" data-showflags="true" class=""></div>
</div>
<div class="col-8">
<div class="niceCountryInputSelector bg-box" style="width: 400px;" data-selectedcountry="ad" data-showspecial="false" data-showflags="true" data-i18nall="All selected" data-i18nnofilter="No selection" data-i18nfilter="Search Country..." data-onchangecallback="onChangeCallback" />
</div>
</div>
</div>
</div>
Hi,
I have made the country flag dropdown list.
In the dropdown list, whether it is scroll by mouse or search country name in the search box, the country will be autocompleted and it will be displayed in the input field with the country name and flag.
The dropdown function working properly.
Requirement:-
Without removing its Name and flag from the dropdown section, Can we display Country Flag outside of the dropdown section?. I am trying for that but I am not able to do that.
I hope someone can understand and help me out in this situation.
Thanks Lots

I modified the function onChangeCallback to place the flag to the other div.
function onChangeCallback(ctr) {
let flag=$(".niceCountryInputSelector").find("[data-flagiso='"+ctr+"']")[0];
flag=$(flag).clone();
$(".col-4").children("div:first-child").empty();
$(".col-4").children("div:first-child").append(flag);
}
So, you can append the flagObjElement to where you want to append.

Removing and Adding classes with button

I'm trying to use a button to remove the class .computer-off and add .computer-on and vice versa when clicked again. I've tried quite a few approaches, but to no avail. Here's one approach:
HTML:
<div id="computer-screen" class="computer-off">
<button onclick="computerPower()" class="power-button">Power</button>
</div>
JS:
function computerPower() {
if ( $("#computer-screen").hasClass('computer-off') ) {
document.getElementById('computer-screen').removeClass('computer-off').addClass('computer-on');
} else {
document.getElementById("computer-screen").removeClass('computer-on').addClass('computer-off');
}
};

I'd suggest, given that you appear to (be trying to) use jQuery:
$('#power').on('click', function() {
$('#computer-screen').toggleClass('computer-off computer-on');
});
$('#power').on('click', function() {
$('#computer-screen').toggleClass('computer-off computer-on');
});
#computer {
width: 60%;
margin: 1em auto;
padding: 1em;
border: 1px solid darkgrey;
overflow: hidden;
border-radius: 0.4em 0.4em 0 0;
}
#computer-screen {
border-radius: 0.5em;
height: 15em;
}
.computer-off {
background-color: #000;
}
.computer-on {
background-color: #060;
box-shadow: 0 0 1.0em #060;
}
#power {
cursor: pointer;
position: relative;
float: right;
width: 2em;
height: 2em;
line-height: 2em;
border-radius: 50%;
border: 1px solid #aaa;
margin-top: 0.3em;
}
.computer-on + #power {
box-shadow: inset 0 1px 3px #666;
}
#power::before {
content: '';
position: absolute;
top: 0.3em;
bottom: 0.75em;
left: 0.9em;
right: 0.9em;
background-color: #ccc;
}
#power::after {
content: '';
height: 1em;
width: 1em;
position: absolute;
border: 0.2em solid #ccc;
border-top-color: transparent;
border-radius: 50%;
bottom: 0.3em;
left: 0.3em;
}
#computer-screen.computer-on + #power::before {
background-color: #0f0;
}
#computer-screen.computer-on + #power::after {
border-color: #0f0;
border-top-color: transparent;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="computer">
<div id="computer-screen" class="computer-off"></div>
<div id="power"></div>
</div>
Or, in plain JavaScript:
document.getElementById('power').addEventListener('click', function() {
var screen = document.getElementById('computer-screen');
screen.classList.toggle('computer-off');
screen.classList.toggle('computer-on');
});
document.getElementById('power').addEventListener('click', function() {
var screen = document.getElementById('computer-screen');
screen.classList.toggle('computer-off');
screen.classList.toggle('computer-on');
});
#computer {
width: 60%;
margin: 1em auto;
padding: 1em;
border: 1px solid darkgrey;
overflow: hidden;
border-radius: 0.4em 0.4em 0 0;
}
#computer-screen {
border-radius: 0.5em;
height: 15em;
}
.computer-off {
background-color: #000;
}
.computer-on {
background-color: #060;
box-shadow: 0 0 1.0em #060;
}
#power {
cursor: pointer;
position: relative;
float: right;
width: 2em;
height: 2em;
line-height: 2em;
border-radius: 50%;
border: 1px solid #aaa;
margin-top: 0.3em;
}
.computer-on + #power {
box-shadow: inset 0 1px 3px #666;
}
#power::before {
content: '';
position: absolute;
top: 0.3em;
bottom: 0.75em;
left: 0.9em;
right: 0.9em;
background-color: #ccc;
}
#power::after {
content: '';
height: 1em;
width: 1em;
position: absolute;
border: 0.2em solid #ccc;
border-top-color: transparent;
border-radius: 50%;
bottom: 0.3em;
left: 0.3em;
}
#computer-screen.computer-on + #power::before {
background-color: #0f0;
}
#computer-screen.computer-on + #power::after {
border-color: #0f0;
border-top-color: transparent;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="computer">
<div id="computer-screen" class="computer-off"></div>
<div id="power"></div>
</div>
References:
JavaScript:
document.querySelector().
Element.classList.
jQuery:
toggleClass().