Js is smooth. Smooth transition to anchor link

Hello, friends. I would like to touch on a topic such as a smooth transition to an anchor link on a website page. If you write voluminous texts on your website, format it correctly, use screenshots and other elements, then smooth scrolling to the anchor will make the design even more attractive. But let's first find out what it is and how it will work. You can see an example of work on this page by clicking on the items in this list.

What is an anchor linkHow to make an HTML anchor link

Anchor links are made in hypertext markup language. Creating an anchor in HTML is not at all tricky. All you need is a little knowledge of this language and an understanding of how it works. If you don’t have any problems with this, then you can do it without much difficulty. So, to anchor on HTML page, you need to write something like the following in the code.

And in order to go to this place on the page where it is indicated this label, you need to write this in the link:

Jump to a label on a page

Jump to a label on a page

With this approach, the transition will be carried out by an instant jump from one place to another

Smooth scrolling to anchor

With the development of web technologies, it has become possible to create more beautiful, dynamic websites with various effects, And . And it’s really great when you can interest a visitor in something other than the content and leave a good impression of visiting the site. To a certain extent, this plays into the hands of the site owner. For a smooth transition to the anchor, we will use the library and connect a very small script.

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< script type= "text/javascript" >$(document) .ready (function () ( $("a" ) .click (function () ( elementClick = $(this ) .attr ( "href" ) ; destination = $(elementClick) .offset () .top ; if ($.browser .safari ) ( $("body" ) .animate ( ( scrollTop: destination ) , 1100 ) ; ) else ( $( "html" ) .animate ( ( scrollTop: destination ) , 1100 ) ; ) return false ; ) ) ; ) ) ;

$(document).ready(function() ( $("a").click(function () ( elementClick = $(this).attr("href"); destination = $(elementClick).offset().top ; if($.browser.safari)( $("body").animate(( scrollTop: destination ), 1100); )else( $("html").animate(( scrollTop: destination ), 1100); ) return false; )); ));

There are three ways to connect this script. The first is to insert it into the page between the head tags. The second is to take it to separate file and connect separately like this:

Label on the page to go to it

Secondly, if you want smooth scrolling to occur not for all anchors, but only for certain ones, you need to change the third line of the script like this:

Jump to a label on a page

Another nuance that I would like to mention is that, unlike a simple HTML anchor, the jQuery anchor does not register in address bar browser link to the anchor when navigating to it. So that you understand what I’m talking about, I’ll give an example of what a link to an anchor might look like in the address bar of a browser.

#anchor

IN Lately Animations that play as you scroll the page are becoming increasingly popular. However, I noticed that the vast majority of browsers are not designed for such animations. Scrolling of pages with the mouse does not occur smoothly (as in Firefox), but in steps. As a result, scrolling animations on pages also play jerkily. In my opinion, the problem here is not with the browsers at all, but with the plugins that are used to create these animations. Because they are the ones who allow sudden jumps. I believe that for any animation there should be some maximum playback speed at which the animation will be smooth and the user will be able to understand what happened on the page. If you agree with me, then move smoothly and without jerking under the cat.

In this article we will talk about a plugin for creating scroll-controlled animations, which I called Scrollissimo. Its closest analogue is the ScrollMagic plugin. From common features they have their purpose and the fact that Greensock was chosen as the animation engine. If for some reason you are not yet familiar with it, then perhaps to fully understand everything that is happening you should read articles about Greensock that have already been published on Habré. For example this one.

In addition to similarities, these plugins also have differences. But I would like to especially highlight the main thing - smooth animation. So that this does not sound unfounded, here is proof for you. Home page ScrollMagic also confirms my words.

How to use it? Connect In order to start using Scrollissimo you need to do two things. First, connect Greensock. Can only be connected minimally required libraries(TweenLite, TimelineLite and CSS):

or, connect one library containing all of the above:

And secondly, we connect Scrollissimo itself. The library is available from the repository. And for bower users it is also possible to install with the command

Bower install scrollissimo
Downloaded, now connect:

You can optionally (but not necessarily) include jQuery for own convenience. Later in the article I will write code using it for greater readability.

I have provided for the possibility of triggering Scrollissimo not only on scrolling the entire page, but also on any other event, but in the vast majority of situations you need to subscribe to the page scroll event:

$(window).scroll(function())( Scrollissimo.knock(); ));
Now with every attack scroll events Scrollissimo will calculate the current animation progress and play it.

NOTE: If you don't need the plugin to count the page scroll itself, you can pass your scrollTop property value to the knock() method. So, for example, Scrollissimo.knock(1000) will tell the plugin that you have scrolled the page 1000 pixels .

NOTE: To support touch devices, there is a touch adapter scrollissimo.touch.js, which combats page freezing while scrolling.

That's it, now you can animate directly! Scrollissimo can animate twins (single animations) and timelines (queue of single animations). Let's start with the twins.

The simplest animation Let's say we have a beautiful red div called Divy. He really wants to grow, but so far he is only 50 pixels wide and high.

#Divy( position: fixed; top: 0; left: 0; height: 50px; width: 50px; background: red; )
Let's make it so that already after 1000 pixels from the beginning of the page it becomes 300 pixels wide. To do this, we will first create the corresponding tween, as if we were doing a regular animation using Greensock:

Var divyTween = new TweenLite($("#Divy"), 1000, ( width: 300 ));
NOTE: As you noticed, the only difference from standard Greensock animation is that we specify the duration of the animation not in seconds, but in pixels (in our case, 1000).

Great! All that remains is to give this twin to be devoured by Scrollissimo:

Scrollissimo.add(divyTween, 0, 6);
Now let's slow down and look at this line. The first argument is the same tween that we created. The second argument is from what position to start the animation. In our case, this is the beginning of the page (0 pixels). The third argument remains. This is where we get to main feature, which distinguishes Scrollissimo from regular plugins. The third argument is the maximum animation playback speed. This speed is measured in abstract dimensionless units and selected “by eye”. I’ll immediately answer the question “What happens if you don’t specify the third parameter?” If you don't specify maximum speed, then it won’t exist. This animation will be played in the same way as it would be played by regular plugins.

Timelines So, Divy has grown in width. How can we help him grow in height? Chains of animations or, in Greensock terms, timelines will help us here. If you've used them before to build animations, then there's nothing new for you. In the same way as we did with the twin above, we do it with the timeline. jsFiddle

Var divyTimeline = new TimelineLite(); divyTimeline.to($("#Divy"),1000 ( width: 300 )); divyTimeline.to($("#Divy"), 1000, ( height: 300 )); Scrollissimo.add(divyTimeline, 0, 6);

Conclusion That's all there is to it successful creation scrolling animations using Scrollissimo. This is where I’ll probably end the article. In conclusion, I will say that the plugin is under active development, it has room to grow and improve. Therefore, I will be glad to receive any questions, advice and feature requests.

Layout, animate!

Good afternoon. Today I want to tell you about such an interesting effect as smooth scrolling to the anchor. For example, this could be a menu at the top of the page that, when clicked, will smoothly scroll to the corresponding element.

You've probably seen a similar effect on other landing pages. Today you will learn how to implement it.

Smooth scrolling to anchor using javascript

In one of the projects, the task was to implement a similar effect with smooth scrolling to a certain element when clicking on one of the menu items.

Let's start by connecting jquery library to our project and write the path to the script that is responsible for smooth scrolling:

We dealt with this. Now you need to put labels and anchors to which scrolling will occur.

I will tell you the example of the menu that was in the project for renting professional equipment for construction and cleaning work. Here it is source:

• Cleaning equipment
• Construction equipment
• Stock

As you can see, everything is standard and without tricks. Blocks corresponding to the menu were subsequently created on the landing page. They revealed a specific service. It was necessary to make a smooth transition to these blocks.

In order to navigate to the desired place on the site, just add a link to the identifier the desired block. Let's do that.

• Cleaning equipment
• Construction equipment
• Stock

Now you need to set the identifiers “cleaning”, “building”, “actions” to the corresponding blocks. For me it looked like this:

Pay attention to the name="cleaning" attribute. It must match the ID. Here is the script itself:

$(function () ( $("a.scrollto").click(function () ( let elementClick = $(this).attr("href") let destination = $(elementClick).offset().top; $ ("html:not(:animated),body:not(:animated)").animate(( scrollTop: destination ), 1100); return false; )); ));

If you, like me, need to implement scrolling to several elements, then just put identifiers in a similar way and that’s it! Very convenient way and easy to implement. I'm not saying it's the best, but it works. If anyone can simplify it, shorten it or somehow improve it, I would be very grateful to you. As for me, so this effect may be useful to many.

Please note that at the beginning of the article we indicated the name and path of the script as follows:

That is, you need to create a folder in the root of your site called js and place a file called perehod.js in it. And then insert the script code itself into it. This is me, just in case. What if someone doesn't understand?

And that’s all for today. Now you know how to implement such a cool effect as smooth page scrolling to the anchor. Bye everyone!

P.s.: Thanks to those who responded to the call in in social networks help with ideas for new articles. I don’t know why you decided to write in private messages, it’s better to leave it in the comments, so it will be easier for other people to write a review if they see that someone more courageous has already done it.

U this method there is a drawback, it does not work well with wow.js, which we used to create the animation in the article. Some animations do not play and remain in their place. empty place. If anyone knows how to fix this, please write in the comments or in

As you probably already guessed, the article will not talk about tulips and roses, or how to grow an apple tree from a chamomile (so this is not the place for young Michurinians :-), but we will talk about changing the color of elements of a web page, about smooth flow of one color into another, i.e. Let's talk about fade effects.

Example

Let's start with an example: hover over a picture and then move the cursor away.

If you are not interested in theoretical details, but need a ready-made solution, then this is for you.

Formulation of the problem

Two colors are given: the start color and the end color.

It is necessary to find intermediate colors, applying which one by one to an element on the page, we will get a smooth transition from the initial color to the final one. You should also find out how many of these intermediate colors there should be and after what time one intermediate color should change to another.

Looking deeper into the issue

Let's take, for example, white as the initial color, and orange-red as the final color.

#FFFFFF

?

...n...

?

#FF4500

Now we need to find intermediate colors. Fine. But how?! How should we approach this issue? To do this, let’s remember (or find out :-) how color is formed on the monitor screen. Any color on a monitor screen is formed from three primary colors: red (Red), green (Green) and blue (Blue), by mixing them (i.e. the RGB color model is used). And colors on a web page are indicated either by numerical values ​​in the same RGB system, or by literals of named colors (for example, White for white, Red for red, etc., but not all colors have names), which, anyway, indicate numerical values. But we will not consider specifying a color by name, because names were invented for the convenience of human memorization, but in our case they will create inconvenience during calculations, because will still require translation into numerical form. You can set the numerical value of a color in two ways: hexadecimal and functional.

• In hexadecimal notation, the format for recording an RGB value is a "#" character immediately followed by three or six hexadecimal characters. A three-digit RGB value (#rgb) is converted to a six-digit sequence (#rrggbb) by duplicating the digits rather than adding zeros. For example, #fb0 expands to #ffbb00. Therefore, the color white (#ffffff) can be specified in a shorter form (#fff).
• In functional representation, the format for writing an RGB value is the string "rgb(", immediately followed by a list of three comma-separated real (or integer, or percentage) values, immediately followed by a parenthesis ")". The integer value 255 is equivalent to the percentage value 100% and hexadecimal values F or FF, so rgb(255,255,255) = rgb(100%,100%,100%) = #FFF.

Thus, a color given in numerical form gives us the values ​​of its component colors, which ultimately gives us the opportunity, by changing each of the primary colors of the initial color, to arrive at the second, final color. If we consider our specific example, then we have the following (values ​​in the decimal system are indicated in parentheses):

#FFFFFF	=	FF (255)	FF (255)	FF (255)
		0	– CE (206)	– FF (255)
#FF4500	=	FF (255)	45 (49)	0

Those. in order to from white to get orange-red, you need to leave the red component of the white color unchanged (change the value to zero), subtract 206 from the green, and subtract 255 from the blue. Let's call these numbers (ΔR = 0, ΔG = -206, ΔB = -255) increments.

Now, to get, for example, two intermediate colors + the final color (3 in total), you need to change the initial values ​​of the RGB triplet (#FFFFFF) not by the full value of the increments ΔR, ΔG, ΔB, but first by 1/3, then by 2 /3 and finally by 3/3 (3/3 = 1, this is the full increment value to obtain the final color, which we, in principle, already know).

#FFFFFF	=	FF (255)	FF (255)	FF (255)
#FFBAAA	=	255 -0	255 - 206*1/3 = 186 (BA)	255 - 255*1/3 = 170 (AA)
#FF7655	=	255 - 0	255 - 206*2/3 = 118 (76)	255 - 255*2/3 = 85 (55)
#FF4500	=	FF (255)	45 (49)	0

So, we have learned to calculate intermediate colors. It remains to clarify one more nuance, in order for a person to notice intermediate colors, it is necessary to make time delays between changing colors, otherwise the changes will happen so quickly that the user simply will not notice the intermediate colors.

Now we have a clear overall picture and we can move on to writing code. There are starting and ending colors, we can calculate n intermediate colors (where n is chosen arbitrarily), and there is a delay value t (where t is chosen arbitrarily). Thus, the algorithm is as follows: assign the first intermediate color to the element on the web page, make a delay by the amount t, assign the second intermediate color to the element, make a delay, ..., assign the nth intermediate color to the element, which is the final color.

Implementation

As an example, let's make a button whose background changes from white to orange-red when clicked.

Let's go... The first wrong thought that may come to mind is to calculate intermediate colors in a loop, making a delay after each iteration.

Function fade() ( for (var i = 1; i