CSS to achieve typing effect

JS implementation

When I was working on a project recently, I needed to achieve the typing effect of characters appearing one by one. I found a good jQuery plug-in Typed.js on the Internet, and the effect was great

<p class="element"></p>

<script src="typed.js"></script>
<script>
  $(function(){
      $(".element").typed({
        strings: ["First sentence.", "Second sentence."],
        typeSpeed: 0
      });
  });
</script>

For specific usage, you can check the project address. The annotated source code has more than 200 lines, which is not complicated.

The implementation method is not magical either. Most people can easily think of it. , use js to add characters to the container one by one. The author has done a lot of characters and the speed is amazing. We can make a simple

var s = 'Hello World! Hello World! Hello World!';
var con = $('.container');
var index = 0;
var length = s.length;
var tId = null;

function start(){
  con.text('');
  
  tId=setInterval(function(){
    con.append(s.charAt(index));
    if(index++ === length){
    clearInterval(tId);
    index = 0;
    start()
    }
  },100);
}

start();

JS Bin

CSS implementation

If the details and browser compatibility requirements are not very strict, we can implement

animation-timing-function

CSS3 through CSS3 We have all been exposed to animation, we usually use it like this

animation: animation-name animation-duration animation-iteration-count

animation: name 5s infinite;

In fact, the full version of animation has many parameters, which can also be written as separate attributes

1. animation-name

2. animation-duration

3. animation-timing-function

4. ##animation-delay

5. animation-iteration-count

6. animation-direction

Today we will focus on animation-timing-function, most Animation changes linearly on the timeline. This is the meaning of the liner parameter we use when jQuery animates, but CSS3 provides some other change methods specified by the animation-timing-function attribute

1. ease

##linear
ease-in
ease-out
ease-in-out
step-start
step-end
steps
cubic-bezier
Each animation effect can correspond to a Bezier curve cubic-bezier can Help me intuitively look at the Bezier curve effect. I won’t say much here.

steps

Let’s take a look at the effect of steps. In fact, as the name suggests, you can think of what steps means, just like Tetris. The small grid falling down is also animated, but it is not continuous, more like frame by frame. Steps is the way to achieve this effect.

The syntax of steps

steps(number_of_steps, [start|end])

number_of_steps How many steps the animation is divided into
direction animation display status, end: default value, displayed before the start of the first frame, start: displayed after the end of the first frame
Look at a scientific picture to help understand

Take two steps

With these we can create interesting effects

JS Bin

.walk {
  width: 125px;
  height: 150px;
  background: url(http://www.php.cn/) left;
  -webkit-animation:anima 1s steps(16) infinite ;
}

@-webkit-keyframes anima{
    from { background-position:2000px 0;}
    to {background-position:0px 0;}
}

Typing effect

The typing effect can be imagined, just change the container width (only When using a single line, you have to increase the length of each step to be consistent with the letter width. JS is better actually)

.typing{
    width:250px;
    white-space:nowrap;
    overflow:hidden;
    -webkit-animation: type 3s steps(50, end) infinite;
  animation: type 3s steps(50, end) infinite;
}


@-webkit-keyframes type{
    from { width: 0;}
}

@keyframes type{
    from { width: 0;}
}

JS Bin

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