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HomeWeb Front-endHTML Tutorialvue一步步实现alert功能。_html/css_WEB-ITnose

原生alert的缺点

  1. 会阻塞一切操作,影响用户体验

  2. 很多浏览器会默认静止alert,例如微信。

  3. 原生alert框样式丑陋。

demo地址: 用力点我

项目地址: web-style 希望大家多多关注。项目里有css样式和vue组件。目标是快速构建后台系统。有一定自适应的设计。

css

思路:最外层是一个黑色透明撑满全屏幕的div并且是fixed的 div.modal-mask 。

在mask内部是一个垂直居中的div框大小可以固定。垂直居中方法有几种可选。我选用的是flex。关键性的css代码如下

.modal-mask{  position: fixed;  top: 0;  left: 0;  right: 0;  bottom: 0;  background-color: rgba(55,55,55,.6);  z-index: 100;  display: flex;  align-items: center;  justify-content: center;}.modal-confirm{  width: 400px;  box-sizing: border-box;  padding: 30px 40px;  background-color: #fff;  border-radius: 6px;}@media only screen and (max-width: 640px) { .modal-confirm{    width: 100%;    margin: 0 20px;    padding: 10px 20px;   }}

其中 modal-confirm 是alert框,有固定的宽度400px 还有padding。 然后我们做了一个小小的自适应。 在小屏上(屏幕宽度小于640px)取消了固定宽度。减少了padding的值,看起来更小巧。

开发vue组件

vue template

首先我希望这个组件功能能像原生的alert事件一样随时随地的方便调用。 不希望每次都 new Vue({}) 一个实例。 所以我做了一些不一样的设计。

<div class="modal-mask" v-show="show">        <div class="modal-confirm">            <h2 id="i-class-iconfont-icon-questioncircle-i-title">                <i class="iconfont icon-questioncircle"></i> {{ title }}            </h2>            <div class="confirm-content">                {{ content }}            </div>            <div class="confirm-btns">                <button class="btn" @click="op(1)">取 消</button>                <button class="btn btn-primary" @click="op(2)">确 定</button>            </div>        </div>    </div>

v-show 是控制alert组件的显示和隐藏的指令。 {{ }} 是vue默认的模版标记。

@click 是绑定click事件的指令

vue data

new Vue({    el: '#V-confirm',    data: {              show: false,              onCancel: false,              onOk: false,              title: '',              content: ''          }    })
  • show 是控制显示隐藏的标记。

  • onCancel onOk 是点击取消或者确定时候触发的回调。

  • title content 是alert显示的文本。

vue methods

 methods: {      op(type){        this.show = false        if(type == '1'){          if(this.onCancel) this.onCancel()        }else{          if(this.onOk) this.onOk()        }        this.onCancel = false        this.onOk = false                document.body.style.overflow = ''      },      alert(setting){        this.title = setting.title ||  '标题'        this.content = setting.content || '内容'        this.onOk = setting.onOk || false        this.onCancel = setting.onCancel || false        this.show = true        document.body.style.overflow = 'hidden'      }    }  }

alert(setting) 方法是控制显示alert组件的方法。接受一个object的参数配置。

op(type) 方法是点击取消和确定按钮的时候触发的时候。

hack代码

  var element = document.createElement('div');  element.id = 'V-confirm'  element.innerHTML = template  document.body.appendChild(element)

这一段代码作用是一开始就把vue实例插入到 body 底部,方便直接 alert 调用。

加入一些动画效果

依赖的是vue指令 transition 具体的用法教程 大家去 过渡-传送门

.modal-enter, .modal-leave {  opacity: 0;}.modal-transition{  transition: all .3s ease;}.modal-enter .modal-confirm,.modal-leave .modal-confirm {  transform: scale(1.1);}.modal-transition{  transition: all .3s ease;}

用法

var setting = {}    setting.title = '你确定删除吗?'    setting.content = '删除不可以恢复...'    setting.onOk = function(){}    setting.onCancel = function(){}        $confirm.alert(setting)
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