How to implement typing animation in CSS3-HTML Tutorial-php.cn

How to implement typing animation in CSS3

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Release： 2017-11-25 14:32:24

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Compared with previous CSS versions, we can use css3 to achieve many cool things, such as typing animations that cannot be achieved with the old version of CSS. Below we will bring you a small case to see how cool typing animations are made.

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>Document</title>
    <style type="text/css" media="screen">
        .box {
            width:100%;
            height:500px;
            text-align:center;
            position:relative;
        }
        .container {
            width:80%;
            height:400px;
            border:1px solid red;
            text-align:left;
            margin:0 auto;
        }
        .container span {
            display:inline-block;
            border:1px solid red;
            transition: all 2s;
            transform:translateY(0px) rotate(0deg);
            font-size:14px;
        }
        textarea {
            width:200px;
            resize:none;
            height:20px;
            line-height:20px;
            padding:10px 0px;
            font-size:14px;
            font-weight:400;
        }
        .clone {
            font-size:14px;
            border:1px solid red;
            width:80%;
            height:20px;
            margin:0 auto;
            line-height:20px;
            padding:10px 0px;
            text-align:left;
            visibility:hidden;
        }
        .clone span {
            transition:all 2s;
            position:absolute;
        }
 
    </style>
</head>
<body>
    <div>
        <div>
 
        </div>
        <div>
            <span></span>
        </div>
        <textarea placeholder="请输入文字"></textarea>
    </div>
</body>
    <script>
    //计算出input输入框的偏移值
    var container = document.querySelector(".container");
    var inner = document.querySelector(".inner");
    var clone = document.querySelector(".clone");
    var textarea = document.querySelector(".textarea");
    var offx = (container.offsetWidth - textarea.offsetWidth-20)/2;
    var offy = (container.offsetHeight + inner.offsetHeight);
 
        //创造一个span标签 需要注入需要注入起始坐标
        function createspan(text,x,y) {
           this.text = text;
           this.x = x;
           this.y = y;
           this.init = {};
        }
        createspan.prototype.render = function() {
            var span = document.createElement("span");
            container.appendChild(span);
            span.style.display = "inline-block";
            span.style.transform = "translateX("+this.x+"px) translateY("+this.y+"px) rotate(720deg)";
            span.style.transition = "all 2s";
            span.innerHTML = this.text;
            this.init = span;
        }
        createspan.prototype.recover = function() {
            var that = this;
            setTimeout(function(){
                that.init.style.transform = "translateX(0px) translateY(0px) rotate(0deg)";
            },10)
        }
        var newtext = "";
        var oldtext = "";
        var x = 0;
        var y = 0;
        var total = "";
        //监听textarea文本框的输入变化情况
        textarea.addEventListener("input",function(){
            var text = "";
            if (inner.offsetWidth >= container.offsetWidth ) {
                offx = (container.offsetWidth - textarea.offsetWidth-20)/2 - textarea.offsetWidth;
            }
            else if (inner.offsetWidth >= textarea.offsetWidth*3) {
                offx = (container.offsetWidth - textarea.offsetWidth-20)/2 - textarea.offsetWidth*3;
            }
             else if (inner.offsetWidth >= textarea.offsetWidth*2) {
                offx = (container.offsetWidth - textarea.offsetWidth-20)/2 - textarea.offsetWidth*2;
            } else if(inner.offsetWidth>=textarea.offsetWidth) {
                offx = (container.offsetWidth - textarea.offsetWidth-20)/2 - textarea.offsetWidth;
            }
 
            //先算文字的变化 两种情况一种是增加一种是减少
            newtext = textarea.value;
            oldtext = inner.innerHTML;
            newtext = newtext.trim();
            //添加字符
            if(newtext.length > oldtext.length) {
                for(var i = 0;i < newtext.length;i++) {
                    if(newtext[i] != oldtext[i]) {
                       text += newtext[i];
                        inner.innerHTML = newtext;
                    }
                }
                total += text;
                // 生成
                    for(var i =0;i < text.length;i++) {
 
                        var a = new createspan(text[i],offx,offy);
                        a.render();
                        a.recover();
                    }
            }
            //删除字符
 
        })
    </script>
</html>

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I believe that through this case, everyone will master this function of CSS3 proficiently. For more exciting information, please pay attention to other related articles on the php Chinese website!