Django之利用ajax实现图片预览

利用ajax实现图片预览的步骤为：

程序实现的方法为：

方法一：

upload.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script src="/static/js/jquery-1.12.4.js"></script>
    <style>
        .upload{
            display: inline-block;padding: 10px;
            background-color: brown;
            position: absolute;
            top: 0;
            bottom: 0;
            right: 0;
            left: 0;
            z-index: 90;
        }
        .file{
            width: 100px;height: 50px;opacity: 0;
            position: absolute;
            top: 0;
            bottom: 0;
            right: 0;
            left: 0;
            z-index: 100;
        }
    </style>
</head>
<body>
    <form id="form1" action="/upload_file/" method="POST" enctype="multipart/form-data" target="ifm1">
        <iframe id="ifm1" name="ifm1" style="display: none;"></iframe>
        <input type="file" name="fafafa" onchange="changeUpalod();" />
        <input type="submit" onclick="iframeSubmit();" value="Form提交"/>
    </form>

    <div id="preview"></div>
    <script>
        function iframeSubmit(){
            $('#ifm1').load(function(){
                var text = $('#ifm1').contents().find('body').text();
                var obj = JSON.parse(text);

                $('#preview').empty();
                var imgTag = document.createElement('img');
                imgTag.src = "/" + obj.data;     //访问的路径
                $('#preview').append(imgTag);

            })
        }

    </script>

Views.py
def upload(request):
    return render(request,'upload.html')

def upload_file(request):
    username = request.POST.get('username')
    fafafa = request.FILES.get('fafafa')

    import os
    img_path = os.path.join('static/image/',fafafa.name)    #存储的路径
    with open(img_path,'wb') as f:      #图片上传
        for item in fafafa.chunks():
            f.write(item)

    ret = {'code': True , 'data': img_path}  #'data': img_path 数据为图片的路径，
    import json
    return HttpResponse(json.dumps(ret))    #将数据的路径发送到前端

前端的效果为：

之后，可以看到

看此时的后台数据

可以看到此时的这张图片已经被保存在一个名为image的文件夹中

方法二（直接将图片进行预览，无需提交）：

upload.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script src="/static/js/jquery-1.12.4.js"></script>
    <style>
        .upload{
            display: inline-block;padding: 10px;
            background-color: brown;
            position: absolute;
            top: 0;
            bottom: 0;
            right: 0;
            left: 0;
            z-index: 90;
        }
        .file{
            width: 100px;height: 50px;opacity: 0;
            position: absolute;
            top: 0;
            bottom: 0;
            right: 0;
            left: 0;
            z-index: 100;
        }
    </style>
</head>
<body>
    <form id="form1" action="/upload_file/" method="POST" enctype="multipart/form-data" target="ifm1">
        <iframe id="ifm1" name="ifm1" style="display: none;"></iframe>
        <input type="file" name="fafafa" onchange="changeUpalod();" />
 value="Form提交"/>#}
    </form>

    <div id="preview"></div>
    <script>
function changeUpalod(){
            $('#ifm1').load(function(){
                var text = $('#ifm1').contents().find('body').text();
                var obj = JSON.parse(text);

                $('#preview').empty();        //原来有就先清空一下
                var imgTag = document.createElement('img');
                imgTag.src = "/" + obj.data;   //制作路径
                $('#preview').append(imgTag);  //添加路径
            });
            $('#form1').submit();
        }
    </script>
</body>
</html>

Views.py
def upload(request):
    return render(request,'upload.html')

def upload_file(request):
    username = request.POST.get('username')
    fafafa = request.FILES.get('fafafa')

    import os
    img_path = os.path.join('static/image/',fafafa.name)    #存储的路径
    with open(img_path,'wb') as f:      #图片上传
        for item in fafafa.chunks():
            f.write(item)

    ret = {'code': True , 'data': img_path}  #'data': img_path 数据为图片的路径，
    import json
    return HttpResponse(json.dumps(ret))    #将数据的路径发送到前端

前端的效果为：

选择文件后的效果为：

后台的效果为：

图片被成功存储在image文件中

Django之利用ajax实现图片预览

猜你喜欢