typing animated text

问题:

I have DIV tag with text inside. Is it possible to change the text content in a loop with a typing effect, where it types out, then goes backward deleting the letters and starting all over with a new text? Is this possible with jquery?

回答1:

Just a simple approach:

$("[data-typer]").attr("data-typer", function(i, txt) {    var $typer = $(this),     tot = txt.length,     pauseMax = 300,     pauseMin = 60,     ch = 0;    (function typeIt() {     if (ch > tot) return;     $typer.text(txt.substring(0, ch++));     setTimeout(typeIt, ~~(Math.random() * (pauseMax - pauseMin + 1) + pauseMin));   }());  });

/* PULSATING CARET */ [data-typer]:after {   content:"";   display: inline-block;   vertical-align: middle;   width:1px;   height:1em;   background: #000;           animation: caretPulsate 1s linear infinite;    -webkit-animation: caretPulsate 1s linear infinite;  } @keyframes caretPulsate {   0%   {opacity:1;}   50%  {opacity:1;}   60%  {opacity:0;}   100% {opacity:0;} } @-webkit-keyframes caretPulsate {   0%   {opacity:1;}   50%  {opacity:1;}   60%  {opacity:0;}   100% {opacity:0;} }

<span data-typer="Hi! My name is Al. I will guide you trough the Setup process."></span> <h3 data-typer="This is another typing animated text"></h3>  <script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

So basically jQuery gets the data-text of your element, inserts character by character, and the pulsating "caret" is nothing by a CSS3 animated :after element of that SPAN.

See also: Generate random number between two numbers in JavaScript

回答2:

Jquery's text() method lets you set the text of an element.

http://api.jquery.com/text/

You would be able to use this to animate the contents by calling this in a loop, giving it the contents that you'd like to see in each frame.

var frames = ['t_', 'ty_', 'typ_', 'type_']

// loop over frames ... inner part reads frame and prints it // use setInterval, etc. $('#my-div').text( frames[i] ); 

I've done more complicated things by splitting the text elements and manipulating the characters but I think in your case it would be overkill.

回答3:

Typing Effect + Erasing Effect + Blinking Cursor

I modified Simon Shahriveri codepan to further add the blinking effect of the cursor. It's compatible with IE also.
Here's the end result: https://codepen.io/jerrygoyal/pen/vRPpGO

HTML:

<h1>   <a href="" class="typewrite" data-period="2000" data-type='[ "Hi, I am Jerry.", "I am Creative.", "I Love Design.", "I Love to Develop." ]'>     <span class="wrap"></span>   </a> </h1> 

CSS:

body {   background-color:#ce6670;   text-align: center;   color:#fff;   padding-top:10em; }  * { color:#fff; text-decoration: none;}  .wrap{    animation: caret 1s steps(1) infinite;    border-right: 0.08em solid #fff;   padding-right: 1px; } @keyframes caret {   50% {     border-color: transparent;   } } 

JS:

var TxtType = function(el, toRotate, period) {         this.toRotate = toRotate;         this.el = el;         this.loopNum = 0;         this.period = parseInt(period, 10) || 2000;         this.txt = '';         this.tick();         this.isDeleting = false;     };      TxtType.prototype.tick = function() {         var i = this.loopNum % this.toRotate.length;         var fullTxt = this.toRotate[i];          if (this.isDeleting) {         this.txt = fullTxt.substring(0, this.txt.length - 1);         } else {         this.txt = fullTxt.substring(0, this.txt.length + 1);         }          this.el.innerHTML = '<span class="wrap">'+this.txt+'</span>';          var that = this;         var delta = 200 - Math.random() * 100;          if (this.isDeleting) { delta /= 2; }          if (!this.isDeleting && this.txt === fullTxt) {         delta = this.period;         this.isDeleting = true;         } else if (this.isDeleting && this.txt === '') {         this.isDeleting = false;         this.loopNum++;         delta = 500;         }          setTimeout(function() {         that.tick();         }, delta);     };      window.onload = function() {         var elements = document.getElementsByClassName('typewrite');         for (var i=0; i<elements.length; i++) {             var toRotate = elements[i].getAttribute('data-type');             var period = elements[i].getAttribute('data-period');             if (toRotate) {               new TxtType(elements[i], JSON.parse(toRotate), period);             }         }      }; 

文章来源: typing animated text