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JQuery操作之二(0918)
Ray的博客
Original
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1) 实战: 武林高手在线相册

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>在线相册管理</title>
    <style>
        .warp {
            width: 360px;
            height: auto;
            background-color: pink;
            border: 3px double grey;
            color: #363636;
            border-radius: 2%;
        }
        .warp .header {
            padding: 15px;
        }
        .warp .header h2 {
            text-align: center;
        }
        .add {
            width: 100px;
            height: 30px;
            border: none;
            cursor: pointer;
            background-color: lightgreen;
            color: white;
        }
        .add:hover {
            background-color: orange;
            font-size: 1.1rem;
        }
        .main {
            overflow: hidden;
        }

        .main ul {
            padding: 0;
            margin: 0;
        }

        .main ul li {
            list-style-type: none;
            float: left;
            margin-left: 20px;
            margin-bottom: 10px;
            width: 150px;
            height: 200px;
            text-align: center;
        }

        .main ul li button {
            margin: 3px;
            border: none;
            border-radius: 5%;
            background-color: skyblue;
        }
        .main ul li button:hover {
            background-color: orange;
            color: white;
            cursor: pointer;
        }

    </style>
</head>
<body>
    <div class="warp">
        <div class="header">
            <h2>武林高手在线相册</h2>
            <p>
                <lable for="img_url">输入图片地址</lable>
                <input type="file" name="img_url" id="img_url" placeholder="图片地址">
            </p>
            <p>
               图片类型:
                <input type="radio" id="rect" name="border" value="0"><label for="rect">直角</label>
                <input type="radio" id="radius" name="border" value="10%"><label for="radius">圆角</label>
                <input type="radio" id="circle" name="border" value="50%"><label for="circle">圆形</label>
            </p>
            <p>是否添加阴影:
                <select name="shadow">
                    <option value="0">不添加</option>
                    <option value="1">添加</option>
                </select>
            </p>
            <p><button class="add">添加图片</button></p>
        </div>
        <div class="main">
            <ul>
                <!--<li>-->
                    <!--<img src="" alt="">-->
                    <!--<button>前</button>-->
                    <!--<button>后</button>-->
                    <!--<button>删</button>-->
                <!--</li>-->
            </ul>
        </div>
    </div>

    <script src="lib/jquery.js"></script>
    <script>
        //分三步完成:

        $(function(){

            $('button.add').on('click',function(){
                //1. 获取图片的相关信息
                // 判断用户是否选择了图片?
               let img_url = $('#img_url').val();
               if (img_url.length === 0) {
                   alert('请选择一张图片');
                   $('#img_url').focus();
                   return false;
               }

               //获取图片的基本特征
                //获取到图片的外观
                let img_type = $(':radio:checked').val();
               //是否添加阴影?
                let shadow = 'none';
                if ($(':selected').val() === '1') {
                    shadow = '3px 3px 3px #666';
                }

                //2. 创建图片并添加到页面中
                console.log('http://php.io/images/'+img_url.split('\\')[2]);
                img_url = 'http://php.io/images/'+img_url.split('\\')[2];


                //创建一个图片
                let img = $('<img>')
                    .prop('src',img_url)
                    .width(150)
                    .height(150)
                    .css({  // 给标签设置 style= ""
                        'border-radius': img_type,
                        'box-shadow': shadow
                    });

                let before = $('<button></button>').text('前移');
                let after = $('<button></button>').text('后移');
                let remove = $('<button></button>').text('删除');

                // 创建一个<li>用来放所有的内容
                let contaier = $('<li>');
                //将图片和三个按钮打包到<li>中
                contaier.append(img,before,after,remove);
                //将<li>添加到页面中的<ul>中
                contaier.appendTo('ul');
             //3. 为三个操作添加功能
                //前移功能:
                before.click(function(){
                    //第一步获取到要移动的图片
                    let current = $(this).parent();
                    let prev = current.prev(); // 前一个元素
                    // 在前一个元素之前将当前元素插入,实际上就是交换一下位置
                    prev.before(current);
                });

                //后移功能:
                after.click(function(){
                    //第一步获取到要移动的图片
                    let current = $(this).parent();
                    let next = current.next(); // 后一个元素
                    // 在后一个元素之后将当前元素插入,实际上就是交换一下位置
                    next.after(current);
                });

                //删除
                remove.click(function () {
                    if (confirm('确认删除吗?')) {
                        $(this).parent().remove();
                    }
                    return false;
                })
            })

        });

    </script>
</body>
</html>

运行实例 »

点击 "运行实例" 按钮查看在线实例

运行效果图:

hm02.png

总结:JQuery的DOM操作简单快捷,十分好用。


Correction status:Uncorrected

Teacher's comments:
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