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-上传头像并预览

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