我有一个表单,用户可以上传 csv 文件,然后将该 csv 文件转换为 pandas 数据框,并且列标题自动填充 <select>
表单中的标记选项。
然后我希望用户选择他们想要的列,并且我希望使用 Flask 将该列选择保存在变量中。
但是,我无法检索用户从此选择标记中选择的选项。
我的模板代码:
<form class="form-horizontal" action="" method="post" enctype="multipart/form-data">
<fieldset>
<legend>Text Analytics</legend>
<div class="form-group form-group-lg">
<label for="inputData" class="col-lg-2 control-label">Choose Data File:</label>
<div class="col-lg-5">
<input type="file" class="form-control" required="required" autofocus="autofocus" name="inputData"/>
</div>
<div class="col-lg-3">
<button class="btn btn-primary" type="submit" name="upload">Upload</button>
</div>
{% if success %}
<div class="alert alert-success">
<a href="#" class="close" data-dismiss="alert" aria-label="close">×</a>
<strong>Success!</strong> {{success}}.
</div>
{% endif %}
{% if error %}
<div class="alert alert-warning">
<a href="#" class="close" data-dismiss="alert" aria-label="close">×</a>
<strong>Error:</strong> {{error}}.
</div>
{% endif %}
</div>
<div class="form-group form-group-lg">
<label for="colSelect" class="col-lg-2 control-label">Select column for analysis:</label>
<div class="col-lg-5">
<select class="form-control" name="colSelect" id="colSelect">
{% for column in columns %}
<option id="{{column}}">{{column}}</option>
{% endfor %}
</select>
</div>
我的 flask 代码:
@app.route('/textanalytics', methods = ['GET', 'POST'])
def upload_file():
error = None
success = None
columns = []
col = None
if request.method == "POST":
if request.files['inputData'] == '':
error = "No file selected"
else:
file = request.files['inputData']
if file and allowed_file(file.filename):
filename = secure_filename(file.filename)
file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
success = 'File uploaded'
data = pd.read_csv(os.path.join(app.config['UPLOAD_FOLDER'], filename), header = 0, low_memory = False)
columns = [i for i in data.columns]
col = request.form.get('colSelect')
return render_template('textanalytics.html', success = success, columns = columns, col = col)
elif file and not allowed_file(file.filename):
error = 'Incorrect file type, .csv only'
return render_template('textanalytics.html', error = error)
return render_template('textanalytics.html', error = error, success = success, columns = columns, col = col)
app.add_url_rule('/uploads/<filename>', 'uploaded_file', build_only=True)
app.wsgi_app = SharedDataMiddleware(app.wsgi_app, {'/uploads': app.config['UPLOAD_FOLDER']})
如您所见,我正在使用 request.form.get('colSelect')
检索该选项但没有任何运气。它只是返回 None
这是它的初始值。
我有一种感觉,这与我放置代码的位置有关,但我是 Flask 的新手,因此需要一些帮助。
最佳答案
您必须为每个选项
指定一个值
。
<option value="{{ column }}">{{ column }}</option>
关于javascript - 如何使用 Flask 获取用户选择的 <select> 标签选项?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39741302/