Disinsection
Creating a slider using Bootstrap. How to create your own bootstrap slider in a few easy steps Responsive carousel for bootstrap 3

Creating a slider using Bootstrap. How to create your own bootstrap slider in a few easy steps Responsive carousel for bootstrap 3

Twitter Bootstrap 3 is one of the best CSS frameworks to develop and maintain content management systems. With Bootstrap, you can easily create blogs or portfolios using the Twitter Bootstrap grid system (grid layout). At the heart of many CMS systems, we usually have a basic component called "Slider" (Carousel), basically it's an auto-sequential display of images, but it can also display the latest completed projects, testimonials from your customers, description of special offers, links to news or recent articles from the blog. In this article, we'll look at how to create a slider using the Carousel component in Twitter Bootstrap 3.

Introduction to Bootstrap 3 Carousel Twitter Component

The markup for the carousel component looks like this:

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From the code above, we can see that the Bootstrap 3 slider is divided into several parts:

Pointers
Slider content
Controls

To transform an element div in the slider, we add the class names: carousel and slide. Class carousel creates a "carousel" effect, that is, changes the slides in a circle. Class slide adds a sliding animation from the right or left side. The pointers are the little circles at the bottom of the slider, they indicate the current position of the slide and the number of slides. Pointers are created using an ordered list.

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An ordered list has a class carousel indicators, which transforms child elements into small circles. Each element li must have attribute data target with the parent container ID. It must also have the attribute data-slide-to with a unique numeric value, to refer to a specific slide, the values must start with "0".

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Each element with a class item has two subsections: image and carousel-caption. The image is used as the background for the slide. Element with class carousel-caption positioned above the image, and used as the title of the slide. Inside carousel-caption, we can add

or tags, or even both.

The control is carried out by the left and right arrows, they are used to change the slides manually.

"glyphicon glyphicon-chevron-left"> >
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"glyphicon glyphicon-chevron-right"> >
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There should be two elements: one for each direction. The first element will have span element with classes glyphicon glyphicon-chevron-left, which is the left arrow icon and the second element will have the classes glyphicon glyphicon-chevron-right, it's a right arrow. In Bootstrap, we can use fonts instead of images to display icons.

That's all! You have successfully created a slider for your site. Also, you didn't write a single line of JavaScript code, but bootstrap.js did everything for you.

carousel settings

To further customize the slider, you can add several attributes data-* for the carousel's parent container.

"data interval" is used to specify the time interval between switching slides. It takes a numeric value, and the number must be in milliseconds.
"data-pause" is used to determine when the pause event will be fired. For example, when it is equal to " hover", slide switching stops when the mouse is over the slider.
"data wrap" is a boolean attribute and allows you to set whether to resume switching slides if the end of the list of slides is reached.

Customization with jQuery

If you would like to use jQuery and data-* attributes, Bootstrap allows initialization with JavaScript. To do this, you can write the following code:

$(".carousel" ) .carousel() ;

Carousel settings can be set using options. For example:

$(".carousel")
interval: 2000
pause: "hover" ,
wrap: true
} ) ;

You can also trigger slider events manually using the following code:

.carousel("pause") // pause
.carousel("cycle") // enable slides
.carousel(3) // show fourth slide
.carousel("prev") // show the previous slide
.carousel("next") // show next slide

The above methods can be called from any JavaScript code to control the normal operation of the slider. I find the prev and next methods very useful if I want to show my own buttons instead of the standard arrows. Especially when they are outside of the carousel layout.

Conclusion

This article should be helpful for those who want to learn how to create a slider without writing thousands of lines of JavaScript code. Without a doubt, this will increase the speed of development. Most importantly, this solution is cross-browser, so you don't have to tear your hair out to make it work in older browsers.

If you have any questions, please use our

Slide show component for cycling elements - image carousel or text slides.

How it works

Carousel is a slideshow for displaying a series of content based on CSS 3D transforms and some JS. It works with text, images, or regular markup. It also supports next/prev buttons.

Example

The carousel does not automatically normalize the size of slide content. Therefore, you may need additional utilities to make their content the right size. As long as carousels support prev/next buttons, they don't need to be added explicitly. Add and customize them yourself.

Give a unique id to the .carousel class for flexibility, especially if you use a lot of carousels on a page.

Slides only

Here is an example of a carousel with only slides. Note the presence of the .d-block and .img-fluid classes in the carousel images - their purpose is to prevent the browser from defaulting image alignment.

With controls

Adds prev/next buttons:

With indicators

You can also add indicators to the carousel along with controls.

Requires initial active element

The .active class must be added to one of the slides, otherwise the carousel will not be visible.

With inscriptions

Add captions to your slides by adding a .carousel-caption class element to any carousel element of the .carousel-item class. Labels are easy to hide on smaller devices using display utilities. They are hidden initially with the .d-none class and show them again on medium devices with the .d-md-block class.

First slide label

Nulla vitae elit libero, a pharetra augue mollis interdum.

Second slide label

Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Third slide label

Praesent commodo cursus magna, vel scelerisque nisl consectetur.

"carousel-caption d-none d-md-block">

...

Usage

Through attributes

The data-slide attribute takes the values prev or next , which change the position of the slide relative to its current position. Or use data-slide-to to navigate to the slide at index, like 2: data-slide-to="2" , slide indexes start at 0 .

The data-ride="carousel" attribute is used to create the carousel animation. It cannot be combined with explicit carousel initialization via JavaScript.

Via JavaScript

Call the carousel manually:

$(".carousel"). carousel()

Options

Parameters can be passed through attributes or JavaScript. To use attributes, add the parameter name to data- , for example: data-interval="" .

Name	Type of	By default	Description
interval	number	5000	Delay time between automatic slide changes. If false, the carousel will not automatically change slides.
keyboard	boolean	true	Whether the carousel will respond to keyboard events.
pause	string \| boolean	hover	If "hover" is set, the slide change is slowed down by mouseenter , and the change starts by mouseleave. If false, hovering over the carousel will not stop the slides from changing. Touch-activated devices: "hover" - pause on touchend (when the user has finished interacting with the carousel) for two intervals, then change slides again. Note that this behavior is in addition to the mouse behavior described above.
ride	line	false	Auto-change carousel slides after the first manual slide change by the user. If carousel - autochange is enabled after loading.
wrap	boolean	true	Whether the carousel should change smoothly or discretely.

Methods

Asynchronous Methods and Transitions

All API Methods asynchronous and launch transition. They are returned to the function that called them when the transition begins, but to the end. Plus, calling a method on a component, executing the transition will be ignored.

.carousel(options)

Initializes the carousel object with the specified options and starts the slide transition.

$(".carousel"). carousel (( interval : 2000 ))

.carousel("cycle")

Changes the carousel slides from left to right.

.carousel("pause")

Stops the slide transition.

.carousel(number)

Scrolls slides up to a certain point (0-based, similar to rows).

.carousel("prev")

Scrolls to the previous slide. Returns the value of the function call before the "target" element is shown(i.e. before the slid.bs.carousel event fires).

.carousel("next")

To the next slide. Returns the value of the function call before the "target" element is shown(i.e. before the slid.bs.carousel event fires).

.carousel("dispose")

Destroys the item's carousel.

Developments

The carousel in Bootstrap has 2 events to apply the functionality. Both events have the following additional properties:

direction: The direction in which slides move ("left" or "right").
relatedTarget: The DOM element that moves to the position of the "flicked" slide.
from: The index of the current slide
to: Index of the next slide

All carousel events are fired directly on the carousel (i.e. in

$("#myCarousel" ). on ("slide.bs.carousel" , function () ( // do something… ))

Good day to everyone who wants to learn something new from the elements of the Bootstrap framework. Today's topic is the Bootstrap Carousel slider. This is a popular element that is present on almost every website.

Therefore, I will tell you how to create a Carousel slider, what built-in tools are needed for this, how you can configure the parameters, and at the end of the article I will show the implementation of a specific example. And now get down to business!

All About Bootstrap Carousel Plugin Tools

A carousel photo gallery is used to present new offers, products, a list of current promotions, convenient portfolio viewing, etc. Therefore, today it is important to be able to work with this plugin under official name Bootstrap Carousel Plugin.

It should be noted right away that the described element is not properly supported in Internet Explorer 9 and earlier versions. However, it works great in (for WordPress, Joomla! and other engines, connecting the framework is quite simple).

In order to easily operate with all the parameters and quickly customize the slider, you need to learn the main built-in classes of Bootstrap 3.

Class	purpose
carousel	Creates the Carousel slider itself.
slide	Adds with css the effect of animation and transitions while switching between slides. The class is optional.
carousel indicators	Adds, so to speak, a control panel in the form of small dots at the bottom of each image, by which you can quickly switch to any image. The class is optional.
carousel-inner	Adds the slides themselves to the gallery.
carousel-caption	Responsible for signing graphic files. Can be included as desired.
item	Defines a set of content for each slide.
Right/left carousel-control	Adds right and left buttons according to the name to switch between frames.

In addition, it is worth knowing other features of the layout of such galleries.

For starters, creating the Carousel block itself requires a declaration id="myCarousel" for the correct functioning of the latter.

In the same div, you need to register the attribute data-ride="carousel", which specifies that the animation should be loaded as soon as the page is loaded.

Now let's move on to the indicators. Each li tag should have a couple of attributes: data target, which points to the ID of a specific Carousel, and data-slide-to, which determines which frame number to go to.

As for the buttons that switch images forward or backward, to implement them, it is worth registering the attribute data-slide with the keyword either "prev" or "next".

Now you know about the basic elements of the framework, thanks to which you can edit the display of the slider in a certain way. Naturally, you can disable automatic frame scrolling, image captions, or side buttons.

Alternative control mechanisms

In addition to using Bootstrap's built-in classes, you can also look to . So, there are many methods and options in JS that implement all the same actions, only through the $.carousel () tool. Among them can be listed such as:

knowledge test

Well, now it's time to check how you learned the material and consolidate the knowledge gained. To do this, I will describe each action that you will need to take on the way to creating the "Carousel".

First you need to include the required scripts and styles. I prefer , but you can download the framework from the official website ( http://getbootstrap.com/) and place the downloaded files in the root of the project directory.

If you agree with me, then in the header of the document we write:

1 2 3

If you are a supporter of the second method, then instead of the first part of the link, you need to insert the path to the file.

Now it remains to implement in the slider. To do this, use your acquired knowledge and write the necessary pieces of code in order:

opening a common block responsible for the described instrument;
a block for specifying control indicators;
block for the slides themselves;
implementation of side buttons.

Only the second and last divs can be excluded from this list.

Now you are definitely ready to write code.

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Carousel gallery example

/*Create the main block*/

/*Filling slides*/

Carousel gallery example

/*Create the main block*/

/*Indicate 4 indicators according to the number of images*/ /*Fill in the slides*/ /*Create side control buttons*/

A slideshow component for iterating through image elements or carousel text slides. In browsers that support the Page Visibility API , the carousel will avoid switching slides when web pages are not visible to the user (for example, when the browser is inactive, the browser window is minimized, etc.). Nested carousels are not supported.

Example

Animations are not supported in Internet Explorer 9

Bootstrap exclusively uses CSS3 for animation, but Internet Explorer 9 does not support the required CSS properties. Therefore, there is no slide transition animation when using this browser. We deliberately chose not to include jQuery-based fallbacks for transitions.

Initial active element required

The .active class must be added to one of the slides. Otherwise, the carousels will not be visible.

Additional titles

Easily add captions to your slides with a .carousel-caption element in any .carousel-item . Place just about extra HTML in there and it will automatically align and format.

first slide label

Nulla vitae elit libero, a pharetra augue mollis interdum.

second slide label

Lorem ipsum dolor sit amet, consectetur adipiscing elit.

third slide label

Praesent commodo cursus magna, vel scelerisque nisl consectetur.

...

Accessibility issue

The carousel component does not meet accessibility standards at all. If you need compatibility, please consider other ways of presenting your Content.

Usage

Multiple carousels

Carousels require the use of an id on the outermost container (in .carousel) to manage the carousel in order to function properly. When adding multiple carousels, or when changing the carousel id , be sure to update the corresponding controls.

With these attributes

Using data attributes it is easy to control the position of the carousel. data-slide can be requested by prev or next , which changes the position of the slider relative to its current position. Alternatively, use data-slide-to to pass the index of the raw carousel slide to data-slide-to="2" , which offsets the position of the slide with index definitions starting from 0 .

The data-ride="carousel" attribute is used to designate the carousel as an animation starting from page load. It cannot be used in conjunction with (unnecessarily) explicit JavaScript initialization of the same carousel.