use*_*044 11 javascript python flask python-2.7 dropzone.js
我正在使用Dropzone.js允许CSV通过Flask网站拖放文件上传.上传过程非常有效.我将上传的文件保存到我指定的文件夹,然后可以df.to_html()用来转换dataframe成HTML代码,然后传递给我的模板.它到达代码中的那一点,但它不呈现模板并且不会抛出任何错误.所以我的问题是为什么Dropzone.js阻止渲染发生?
我也试过HTML从表中返回代码而不是使用render_template,但这也行不通.
init .py
import os
from flask import Flask, render_template, request
import pandas as pd
app = Flask(__name__)
# get the current folder
APP_ROOT = os.path.dirname(os.path.abspath(__file__))
@app.route('/')
def index():
return render_template('upload1.html')
@app.route('/upload', methods=['POST'])
def upload():
# set the target save path
target = os.path.join(APP_ROOT, 'uploads/')
# loop over files since we allow multiple files
for file in request.files.getlist("file"):
# get the filename
filename = file.filename
# combine filename and path
destination = "/".join([target, filename])
# save the file
file.save(destination)
#upload the file
df = pd.read_csv(destination)
table += df.to_html()
return render_template('complete.html', table=table)
if __name__ == '__main__':
app.run(port=4555, debug=True)
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upload1.html
<!DOCTYPE html>
<meta charset="utf-8">
<script src="https://rawgit.com/enyo/dropzone/master/dist/dropzone.js"></script>
<link rel="stylesheet" href="https://rawgit.com/enyo/dropzone/master/dist/dropzone.css">
<table width="500">
<tr>
<td>
<form action="{{ url_for('upload') }}", method="POST" class="dropzone"></form>
</td>
</tr>
</table>
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编辑
以下是csv我上传的示例数据:
Person,Count
A,10
B,12
C,13
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Complete.html
<html>
<body>
{{table | safe }}
</body>
</html>
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你的代码确实有效.您的模板将被渲染并返回.
Dropzone将上传您在后台拖放到浏览器中的文件. 它将使用服务器的响应并保持页面不变.它使用服务器的响应来了解上传是否成功.
要看到这个:
这是我浏览器的屏幕截图.我从您的问题中复制了您的代码.
要实际看到渲染,complete.html您需要添加另一个烧瓶端点,并有办法导航到该端点.
例如:upload1.html添加:
<a href="{{ url_for('upload_complete') }}">Click here when you have finished uploading</a>
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在init.py变化和添加:
def upload():
...
# you do not need to read_csv in upload()
#upload the file
#df = pd.read_csv(destination)
#table += df.to_html()
return "OK"
# simply returning HTTP 200 is enough for dropzone to treat it as successful
# return render_template('complete.html', table=table)
# add the new upload_complete endpoint
# this is for example only, it is not suitable for production use
@app.route('/upload-complete')
def upload_complete():
target = os.path.join(APP_ROOT, 'uploads/')
table=""
for file_name in os.listdir(target):
df = pd.read_csv(file_name)
table += df.to_html()
return render_template('complete.html', table=table)
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更新:现在您可以使用Flask-Dropzone,这是一个将Dropzone.js与Flask集成的Flask扩展。对于此问题,您可以将其设置DROPZONE_REDIRECT_VIEW为要在上传完成时重定向的视图。
Dropzone.js使用AJAX来发布数据,这就是为什么它不会将控件交还给您的视图函数的原因。
完成所有文件上传后,有两种方法可以重定向(或渲染模板)。
您可以添加一个按钮来重定向。
<a href="{{ url_for('upload') }}">Upload Complete</a>
您可以将事件侦听器添加到自动重定向页面(使用jQuery)。
<script>
Dropzone.autoDiscover = false;
$(function() {
var myDropzone = new Dropzone("#my-dropzone");
myDropzone.on("queuecomplete", function(file) {
// Called when all files in the queue finish uploading.
window.location = "{{ url_for('upload') }}";
});
})
</script>
Run Code Online (Sandbox Code Playgroud)在视图函数中,添加一条if语句以检查HTTP方法是否为POST:
import os
from flask import Flask, render_template, request
app = Flask(__name__)
app.config['UPLOADED_PATH'] = 'the/path/to/upload'
@app.route('/')
def index():
# render upload page
return render_template('index.html')
@app.route('/upload', methods=['GET', 'POST'])
def upload():
if request.method == 'POST':
for f in request.files.getlist('file'):
f.save(os.path.join('the/path/to/upload', f.filename))
return render_template('your template to render')
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