DAY19-上传头像并预览

一个简单的注册页面：
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <link rel="stylesheet" href="/static/bs/css/bootstrap.css">

    <script src="/static/js/jquery-3.2.1.min.js"></script>

    <style>

        #avatar{

       /*隐藏上传按钮-*/

            display: none;

        }

       /*设置预览头像尺寸*/

        .avatar_img{

            width: 60px;

            height: 60px;

            margin-left: 10px;

        }

        .error{

            color: red;

        }

    </style>

</head>

<body>

<h3>注册页面</h3>

<div class="container">

    <div class="row">

        <div class="col-md-6 col-md-offset-3">

            <form>

                {% csrf_token %}

                <div class="form-group">

                    <label for="user">用户名</label>

                    <input type="text" id="user" class="form-control"><span class="error pull-right"></span>

                </div>

                 <div class="form-group">

                    <label for="pwd">密码</label>

                    <input type="password" id="pwd"  class="form-control"><span class="error pull-right"></span>

                </div>

                <div class="form-group">

                    <label for="repeat_pwd">确认密码</label>

                    <input type="password" id="repeat_pwd"  class="form-control"><span class="error pull-right"></span>

                </div>

                <div class="form-group">

                    <label for="email">邮箱</label>

                    <input type="email" id="email"  class="form-control"><span class="error pull-right"></span>

                </div>

                 <div class="form-group">

                 <!--label实现点击图片就能上传头像-->

                 <!--img显示默认图片-->

                     <label for="avatar">头像 <img src="/static/img/default.png" alt="" class="avatar_img"></label>

                     <input type="file" id="avatar"  class="form-control">

                </div>

                <input type="button" value="submit" class="reg_btn btn btn-default">

                <span class="error"></span>

            </form>

        </div>

    </div>

</div>

<script>

    // 头像预览

   $("#avatar").change(function () {

       //FileReader可以读出头像在客户端存放路径

       var reader=new FileReader();

       //获取头像对象

       var choose_file=$(this)[0].files[0];

       //用reader对象录取图片对象

       reader.readAsDataURL(choose_file);

       //reader需要一定时间，onload等待reader读完

       reader.onload=function(){

             //result获取图片路径，将src的默认图片地址更换为本地头像路径

             $(".avatar_img").attr("src",reader.result)

       };

   })

     // 注册

    $(".reg_btn").click(function () {

        var formdata=new FormData();

        formdata.append("user",$("#user").val());

        formdata.append("pwd",$("#pwd").val());

        formdata.append("email",$("#email").val());

        formdata.append("repeat_pwd",$("#repeat_pwd").val());

        formdata.append("avatar_img",$("#avatar")[0].files[0]);

        $.ajax({

             url:"",

             type:"post",

             contentType:false,

             processData:false,

             data:formdata,

             success:function (data) {

                 // console.log(data);

                 var data=JSON.parse(data);

                 if (data.user){

                     console.log("OK")

                 }else{

                     // 清空操作

                     $("form span.error").html("")

                     console.log(data.msg)

                     $.each(data.msg,function (filed,error_list) {

                         $("#"+filed).next().html(error_list[0])

                     })

                 }

             }

        })

    })

</script>

</body>

</html>
day19

DAY19-上传头像并预览
