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Jun 24, 2016 am 11:26 AM

Javascript实现弹出框

作者 :towaywu

2016-02-19 08:57:50.0

22 浏览

类别 :编程语言 HTML/CSS/JAVASCRIPT 前端编程

弹出框在页面中是不可缺少的一部分. 我们今天来实现简单的弹出框效果.

首先我们来分析弹出框的部件.简单弹出框分为头,内容,尾部. 头部中有标题和关闭按钮,内容就可以图文,媒体,iframe,flash等等,尾部就是按钮(确认,取消等等),这个例子尾部我就不加入按钮了,这个例子主要是实现弹出框的核心部分.

<!DOCTYPE html><html><head>    <meta charset="UTF-8">    <title></title>    <style>        body, div{            padding: 0;            margin: 0;        }        html, body {            width: 100%;            height: 100%;        }        a {            text-decoration: none;        }        .pop {            border-radius: 5px;            background-color: #fff;            border: #eee 1px solid;            position: absolute;            width: 350px;            left: 35%;            top: 25%;        }        .pop-title {            background-image: linear-gradient(#eee,#efefef);            position: relative;            cursor: pointer;        }        .pop-title h3,.pop-title a{            display: inline-block;        }        .pop-title h3{            font-size: 14px;            margin: 0;            padding: 5px;        }        .pop-title a {            position: absolute;            top: 5px;            right: 5px;        }        .pop-content {            padding: 10px;        }    </style></head><body>    <div>        <div>            <h3 id="消息">消息</h3>            <a href="javascript:;">X</a>        </div>        <div>            弹出框已显示        </div>        <div></div>    </div></body></html>

弹出框,在头部按下的时候,开启移动模式,在头部松开的时候就禁止移动.其实就这么一句的意思. 当然逻辑也是比较简单的.

这里我们就可能想到了几个变量,移动的X,Y坐标,移动的开关和禁止. 然后就是给title加入onmousedown 和 onmouseup事件.

onmousedown事件中主要是开启移动.

onmouseup 事件中逻辑主要是关闭移动,禁止移动弹出框.

接着需要移动,而移动需要时在某个范围内移动.这里我们是在body里面移动. 所以给body加入onmousemove事件. 这里面做的事情就是移动弹出框的位置处理.

在这三个事件中主要是配合了CSS中的position属性和JS中的Event事件中的属性的坐标.

  var pop = document.getElementsByClassName("pop")[0];        var pop_title = pop.getElementsByClassName("pop-title")[0];        var bd = document.body;        var x = 0;        var y = 0;        var ismove = false; // 是否开启移动        var downx = 30;        var downy = 30;        pop_title.onmousedown = function (e) {            x = e.pageX;            y = e.pageY;            downx = e.offsetX;            downy = e.offsetY;            ismove = true;        }        bd.onmousemove = function (e) {            if (ismove) {                var cx = e.pageX - downx;                var cy = e.pageY - downy;                pop.style.left = cx + "px";                pop.style.top = cy + "px";                x = e.x;                y = e.y;            }            e.preventDefault();        }        pop_title.onmouseup = function (e) {            x = e.pageX;            y = e.pageY;            ismove = false;            console.log("移动完成")        }

移动弹出框完成后,我们给关闭按钮加入关闭事件.

//关闭        var pop_close = pop.getElementsByClassName("pop-close")[0];  pop_close.onclick = function () {      pop.parentNode.removeChild(pop); }

好了,简单的弹出框就实现了.同样代码自己可以优化封装,加入其它的功能.兼容性问题可能需要自己去处理一下(IE9以前的版本).

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标签 :javascript教程javascript实例

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