How to make side by side drop down menus with bootstrap?

How to make side by side drop down menus with bootstrap? - javascript

I am trying to a birthday input for my form which will contain three dropdown menus. The first one will have day, then month, and then year.
<div class="dropdown" style="position:inline-block">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
That is the code for one dropdown menu from the bootstrap website.

Have a look on below code
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div class="row">
<div class="col-lg-4 col-sm-4 col-xs-4">
<div class="dropdown">
<button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Example
<span class="caret"></span></button>
<ul class="dropdown-menu">
<li>HTML</li>
<li>CSS</li>
<li>JavaScript</li>
</ul>
</div>
</div>
<div class="col-lg-4 col-sm-4 col-xs-4">
<div class="dropdown">
<button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Example
<span class="caret"></span></button>
<ul class="dropdown-menu">
<li>HTML</li>
<li>CSS</li>
<li>JavaScript</li>
</ul>
</div>
</div>
<div class="col-lg-4 col-sm-4 col-xs-4">
<div class="dropdown">
<button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Example
<span class="caret"></span></button>
<ul class="dropdown-menu">
<li>HTML</li>
<li>CSS</li>
<li>JavaScript</li>
</ul>
</div>
</div>
</div>
may it helps you.

You can use btn-group class to make your button menu side by side.
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<div class="btn-group">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
<div class="btn-group">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
<div class="btn-group">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>

Related

Change the collapse direction bootstrap

When I click on the button I want it to open up from the bottom and collapse back down rather than like a dropdown.
<head>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/css/bootstrap.min.css" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
</head>
<body>
<p>
<a class="btn btn-primary" data-bs-toggle="collapse" href="#multiCollapseExample1" role="button" aria-expanded="false" aria-controls="multiCollapseExample1">Toggle first element</a>
<button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target="#multiCollapseExample2" aria-expanded="false" aria-controls="multiCollapseExample2">Toggle second element</button>
<button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target=".multi-collapse" aria-expanded="false" aria-controls="multiCollapseExample1 multiCollapseExample2">Toggle both elements</button>
</p>
<div class="row">
<div class="col">
<div class="collapse multi-collapse" id="multiCollapseExample1">
<div class="card card-body">
Some placeholder content for the first collapse component of this multi-collapse example. This panel is hidden by default but revealed when the user activates the relevant trigger.
</div>
</div>
</div>
<div class="col">
<div class="collapse multi-collapse" id="multiCollapseExample2">
<div class="card card-body">
Some placeholder content for the second collapse component of this multi-collapse example. This panel is hidden by default but revealed when the user activates the relevant trigger.
</div>
</div>
</div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.1.3/js/bootstrap.min.js"></script>
</body>

In your fiddle you are loading bootstrap 3.x script, which is inconsistent with the styles, which are 5.X.
Independent of the version, a solution for your request is to use a dropup.
Here's a running snippet using version 5:
<script src="//code.jquery.com/jquery.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>
<body>
<!-- Default dropup button -->
<div class="btn-group dropup" style="position: absolute; bottom: 10px;">
<button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
Dropup
</button>
<ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
<li><a class="dropdown-item" href="#">Something else here</a></li>
</ul>
<button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
Dropup 2
</button>
<ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
<li><a class="dropdown-item" href="#">Something else here</a></li>
</ul>
</div>

Multiple dropdown in same React component is not working

I have used two dropdown from mdbootstrap https://mdbootstrap.com/docs/jquery/components/dropdowns/
But both the dropdown has same dropdown items why so? In console -> source I am able to see different options but while displaying it is not shown why so? In below screenshots you can see dropdown items for both are same why is this happening? I am not able to debug this because in console -> source also it show shopping, travel etc but it is not displaying in dropdown why so?
code:
import React from "react";
import "./transaction.css";
const Transaction = () => {
return (
<div className="transactionContainer">
<h5 class="card-header info-color white-text text-center py-4">
<strong>Transaction Information</strong>
</h5>
<div class="card">
<div class="card-body px-lg-5 pt-0">
<form class="text-center" style={{ color: "#757575" }} action="#!">
<div class="md-form">
<input type="text" id="amount" class="form-control" />
<label for="amount">Amount</label>
</div>
<button
class="btn btn-primary dropdown-toggle mr-4"
type="button"
data-toggle="dropdown"
aria-haspopup="true"
aria-expanded="false"
>
Payment Method
</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">
Cash
</a>
<a class="dropdown-item" href="#">
Debit/Credit Card
</a>
<a class="dropdown-item" href="#">
Net Banking
</a>
</div>
<button
class="btn btn-primary dropdown-toggle mr-4"
type="button"
data-toggle="dropdown"
aria-haspopup="true"
aria-expanded="false"
>
Category
</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">
Shopping
</a>
<a class="dropdown-item" href="#">
Travel
</a>
<a class="dropdown-item" href="#">
Entertainment
</a>
</div>
<button
class="btn btn-outline-info btn-rounded btn-block my-4 waves-effect z-depth-0"
type="submit"
>
Add transaction
</button>
</form>
</div>
</div>
</div>
);
};
export default Transaction;
Screenshots:

Each dropdown needs to be wrapped inside a div with class of dropdown like this:
<div className="dropdown">
<button
class="btn btn-primary dropdown-toggle mr-4"
type="button"
data-toggle="dropdown"
aria-haspopup="true"
aria-expanded="false"
>
Payment Method
</button>
<div id="menu1" class="dropdown-menu">
<a class="dropdown-item" href="#">
Cash
</a>
<a class="dropdown-item" href="#">
Debit/Credit Card
</a>
<a class="dropdown-item" href="#">
Net Banking
</a>
</div>
</div>

How to make Bootstrap dropdown respect horizontal viewport limits on mobile?

Bootstrap class dropdown-menu can autodetect the viewport of the screen and adapt accordingly
So if there is no room for the dropdown to open to the bottom it opens up, as shown by the example bellow
However it doesn't happen for the horizontal limits of the viewport, and I end up getting this horizontal scroll, here's an example of this happening:
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet"/>
<div class="bd-example">
<div class="btn-group">
<button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Primary</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Secondary</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Success</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-info dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Info</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-warning dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Warning</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Danger</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
</div>
I also created a gif demonstrating exacly what I mean:
How can I reproduce the same behavior as vertical viewport detection to reposition the element? Ideally it should look like this, aligning itself with the other end of the button.

Everywhere you have the class dropdown-menu add dropdown-menu-right Note that you need both classes, and dropdown-menu-right should be second. i.e. class="dropwdown-menu dropdown-menu-right"
This should leave you with this:
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet"/>
<div class="bd-example">
<div class="btn-group">
<button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Primary</button>
<div class="dropdown-menu dropdown-menu-right">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Secondary</button>
<div class="dropdown-menu dropdown-menu-right">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Success</button>
<div class="dropdown-menu dropdown-menu-right">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-info dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Info</button>
<div class="dropdown-menu dropdown-menu-right">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-warning dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Warning</button>
<div class="dropdown-menu dropdown-menu-right">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Danger</button>
<div class="dropdown-menu dropdown-menu-right">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div><!-- /btn-group -->
</div>

I was able to do it with jQuery using a method found on this page.
Now it may not be elegant, but it does work!
$(".dropdown-toggle").click(function(){
setTimeout(
function()
{
$(document).scrollLeft(1);
if($(document).scrollLeft() != 0){
$(".dropdown-menu").css("marginRight", "100px");
}
$(document).scrollLeft(0);
}, 10);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet" />
<div class="bd-example">
<div class="btn-group">
<button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Primary</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div>
<!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Secondary</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div>
<!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Success</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div>
<!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-info dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Info</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div>
<!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-warning dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Warning</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div>
<!-- /btn-group -->
<div class="btn-group">
<button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Danger</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div>
<!-- /btn-group -->
</div>

Bootstrap dropdown button disappears after clicking it

The button which should unhide the dropdown menu actually hides the dropdown button instead. Also, I have one more dropdown menu in this navigation and it works perfectly fine.
<div class="side-nav pull-right">
<div class="dropdown">
<button type="button" class="profile dropdown-toggle" data-toggle="dropdown" id = "dropdownMenuButton" aria-haspopup="true" aria-expanded="false">Bonjour Arthur K. <img src = "images/triangle.png" alt =""/> </button>
<div class="dropdown-menu" role="menu" aria-labelledby="dropdownMenuButton">
Utilisateurs
Snippets
Traductions
</div>
</div>
Mon compete
</div>

check this working example.. for more read this
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
<div class="dropdown">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>

The id value must be unique in dreamweaver?

Why its showing like for few id.
What i am making wrong on this
<div class="btn-group btn-group-sm" role="group">
<button id="startHour" type="button" class="btn btn-secondary" data-toggle="dropdown" href="#">hour</button>
<div class="dropdown-menu" aria-labelledby="startHour">
<a class="dropdown-item" href="#">1</a>
<a class="dropdown-item" href="#">2</a>
<a class="dropdown-item" href="#">3</a>
<a class="dropdown-item" href="#">4</a>
<a class="dropdown-item" href="#">5</a>
<a class="dropdown-item" href="#">6</a>
<a class="dropdown-item" href="#">7</a>
<a class="dropdown-item" href="#">8</a>
<a class="dropdown-item" href="#">9</a>
<a class="dropdown-item" href="#">10</a>
<a class="dropdown-item" href="#">11</a>
<a class="dropdown-item" href="#">12</a>
</div>
<span style="color:white; background-color:#5A6268">:</span>
<div class="btn-group btn-group-sm" role="group">
<button id="startMinute" type="button" class="btn btn-secondary"
data-toggle="dropdown" href="#">min</button>
<div class="dropdown-menu" aria-labelledby="startMinute">
<a class="dropdown-item" href="#">00</a>
<a class="dropdown-item" href="#">05</a>
<a class="dropdown-item" href="#">10</a>
<a class="dropdown-item" href="#">15</a>
<a class="dropdown-item" href="#">20</a>
<a class="dropdown-item" href="#">25</a>
<a class="dropdown-item" href="#">30</a>
<a class="dropdown-item" href="#">35</a>
<a class="dropdown-item" href="#">40</a>
<a class="dropdown-item" href="#">45</a>
<a class="dropdown-item" href="#">50</a>
<a class="dropdown-item" href="#">55</a>
</div>
</div>
<button type="button" class="btn btn-secondary">am</button>
<button type="button" class="btn btn-secondary">zone</button>
<button type="button" class="btn btn-primary">Set</button>
</div>
</td>
<td>
<div class="btn-group btn-group-sm" role="group">
<button type="button" class="btn btn-secondary">hour</button>
<button type="button" class="btn btn-secondary">min</button>
<button type="button" class="btn btn-secondary">am</button>
<button type="button" class="btn btn-secondary">zone</button>
<button type="button" class="btn btn-primary">Set</button>
</div>
</td>
</tr>
Here i am using same for drop down list. startHour and startMinute are the unique id which, I am using for drop down the hour and minute and also, it used for more than 20 times. For few drop down it shows id must be unique. what does it mean..

In html every tag need to be unique. If you need same id for 2 element, time to for thinking class.
For more info click here

in javascript the dom's id just like a public variable；
example this domObject is in window.a;
so the id must be unique;

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