Home >Web Front-end >JS Tutorial >How to add animation effect to input box in js
How to add animation effect to input box in js

php中世界最好的语言Original: 2018-04-17 16:41:351581browse
This time I will show you how to add animation effects to the input box with js. What are the precautions for adding animation effects to the input box with js. The following is a practical case, let's take a look.
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
</head>
<body >
<p id="header">
    <form class="form" >
        <input type="text" class="input_key" maxlength="100" autocomplete="on">
    </form>
</p>
<script src="js/jquery-1.11.3.min.js"></script>
<script>
    (function() {
        function p() {
            window.requestAnimFrame(p), a = d(0, 360), s.globalCompositeOperation = "destination-out", s.fillStyle = "rgba(0, 0, 0, 0.5)", s.fillRect(0, 0, e, t), s.globalCompositeOperation = "source-over";
            var n = u.length;
            while (n--) u[n].draw(), u[n].update(n)
        }
        function d(e, t) {
            return Math.random() * (t - e) + e
        }
        function v() {
            i = $('<canvas width="&#39; + e + &#39;" height="&#39; + t + &#39;" />').appendTo(n).css({
                position: "absolute",
                left: -20,
                top: -44,
                zIndex: 999,
                pointerEvents: "none"
            }), s = i[0].getContext("2d"), r = $("<p />").appendTo(n).css({
                fontSize: "16px",
                fontFamily: "arial",
                height: 1,
                position: "absolute",
                left: 15,
                top: 50,
                zIndex: 0,
                visibility: "hidden",
                whiteSpace: "nowrap"
            })
        }
        if (/msie/i.test(navigator.userAgent)) return;
        var e = 600,
                t = 100,
                n = $("#header .form"),
                r = null,
                i = null,
                s = null,
                o = !1,
                u = [],
                a = 120,
                f = 8,
                l = 0,
                c = 0,
                h = function(e, t, n) {
                    var r = this;
                    r.x = e, r.y = t, r.dir = n, r.coord = {}, r.angle = d(0, -Math.PI), r.speed = d(2, 8), r.friction = .95, r.gravity = 1, r.hue = d(a - 10, a + 10), r.brightness = d(50, 80), r.alpha = 1, r.decay = d(.03, .05), r.init()
                };
        h.prototype = {
            init: function() {
                var e = this;
                e.coord = {
                    x: e.x,
                    y: e.y
                }
            },
            update: function(e) {
                var t = this;
                t.coord = {
                    x: t.x,
                    y: t.y
                }, t.speed *= t.friction, t.x += Math.cos(t.angle) * t.speed + t.dir, t.y += Math.sin(t.angle) * t.speed + t.gravity, t.alpha -= t.decay, t.alpha <= t.decay && u.splice(e, 1)
            },
            draw: function() {
                var e = this;
                s.fillStyle = "hsla(" + e.hue + ", 100%, " + e.brightness + "%, " + e.alpha + ")", s.beginPath(), s.arc(e.coord.x, e.coord.y, 2, 0, 2 * Math.PI, !0), s.closePath(), s.fill()
            }
        }, window.requestAnimFrame = function() {
            return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || function(e) {
                window.setTimeout(e, 1e3 / 60)
            }
        }(), $(".input_key").on("focus", function() {
            o || (v(), o = !0, p());
            var e = $(this.form),
                    t = -20,
                    n = -44;
            i.appendTo(e), e.attr("name") == "f3" && ($("body").hasClass("layout1") ? t = 97 : t = -20), i.css({
                left: t,
                top: n
            })
        }).on("keydown", function(e) {
            var t = $(this.form);
            if (!(this.selectionStart >= 0 && r)) return;
            var n = this.selectionStart,
                    i = this.value.substring(0, n).replace(/ /g, " "),
                    s = r.html(i).width(),
                    o = 0;
            i.length > c ? o = -2 : o = 2, c = i.length, s >= 500 && (s = 500);
            var a = f;
            while (a--) u.push(new h(s + 50, 60, o));
//  这里是控制输入框都抖动的
            t.css({
                "-webkit-transform": "translate(-1px, 1px)",
                "-moz-transform": "translate(-1px, 1px)",
                "-MS-transform": "translate(-1px, 1px)",
                "-o-transform": "translate(-1px, 1px)",
                transform: "translate(-1px, 1px)"
            }),
                    setTimeout(function() {
                t.css({
                    "-webkit-transform": "none",
                    "-moz-transform": "none",
                    "-MS-transform": "none",
                    "-o-transform": "none",
                    transform: "none"
                })
            }, 10)
        })
    })();
</script>
</body>
</html>
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!
How to add animation effect to input box in js

Related articles
