我正在开发一个基于flask，postgreSQL构建的网络应用程序。它用于收集实验室数据和管理收集的数据。这个应用程序有两个页面，我附上的页面用于显示用户通过查询数据库选择的一些实验室的实验室数据。
一个页面（admin_select_lab_for_data.html）使用户能够选择一些现有实验室并将用户重定向到另一个页面（admin_edit_data.html），该页面显示所选实验室中的所有数据。当我选择实验室并单击按钮进入实验室时，浏览器无法重定向到（admin_edit_data）。
python打印的输出都是正确的（这证明在烧瓶中，重定向发生，lab_id正确传递并且所有相关数据都被正确查询）。 http请求返回200 ok。但是，浏览器只停留在同一页面上，并且ajax POST请求会警告错误（这与admin_select_lab_for_data已收到数据的事实不一致）。
main.py
# review/edit Data
@app.route('/admin_select_lab_for_data',methods=['GET','POST'])
def admin_select_lab_for_data():
if request.method=='POST':
lab_ids = []
jsonData = request.get_json()
lab_ids = jsonData['lab_ids']
return redirect(url_for('admin_edit_data',lab_ids={'lab_ids':lab_ids}))
lab_list = []
db_session = db.get_session()
for lab in db_session.query(schema.Lab_info).all():
data_num = 0
query_rows = db_session.query(schema.Lab_rows).filter(schema.Lab_rows.lab_id==lab.lab_id)
for r in query_rows:
data_num += db_session.query(schema.Lab_data).filter(schema.Lab_data.row_id==r.row_id).count()
lab_list.append({'lab_id':lab.lab_id,'lab_name':lab.lab_name,'class_name':lab.class_name,'prof_name':lab.prof_name,'data_num':data_num})
return render_template('admin_select_lab_for_data.html',lab_list=lab_list)
# review/edit Data
@app.route('/admin_edit_data')
def admin_edit_data():
# Get a list of lab_ids that are needed to be retrieved
lab_ids = ast.literal_eval(request.args['lab_ids'])['lab_ids']
# lab_ids = ['test1_101_C','test2_101_N']
lab_data = []
lab_data_by_student = []
row_names_list = []
err_msg = ''
db_session = db.get_session()
#Group row data according to row_name
query_rows = db_session.query(schema.Lab_rows).filter(schema.Lab_rows.lab_id==lab_ids[0]).order_by(schema.Lab_rows.row_order)
for r in query_rows:
lab_data.append({'row_name':r.row_name,'row_data_list':[]})
row_names_list.append(r.row_name)
for lab_id in lab_ids:
query_rows = db_session.query(schema.Lab_rows).filter(schema.Lab_rows.lab_id==lab_id).order_by(schema.Lab_rows.row_order)
index = 0
#Check whether these labs are compatitble with each other(the number of rows and the names of rows must be the same)
if query_rows.count()!=len(row_names_list):
err_msg = lab_ids[0]+' and '+lab_id+' are incompatible: the number of rows is different-'+str(query_rows.count())+' and '+str(len(row_names_list))
else:
for r in query_rows:
if (row_names_list[index]!=r.row_name):
err_msg = lab_ids[0]+' and '+lab_id+' are incompatible:'+row_names_list[index]+' and '+r.row_name+' are different row names'
break
else:
query_datas = db_session.query(schema.Lab_data).filter(schema.Lab_data.row_id==r.row_id).order_by(schema.Lab_data.data_id)
for data in query_datas:
lab_data[index]['row_data_list'].append({'lab_id':lab_id,'student_name':data.student_name,'data_id':data.data_id,'row_data':data.row_data})
index+=1
if err_msg!='':
return render_template('admin_edit_data.html',lab_data=lab_data,student_data=lab_data_by_student,lab_ids=lab_ids,err_msg=err_msg)
#Group row data according to student_name
for row in lab_data:
#sort row_data_list to make all the data across different lists
sorted(row['row_data_list'],key=lambda element:element['data_id'])
# if list is empty, add student names into it
if not lab_data_by_student:
for data in row['row_data_list']:
lab_data_by_student.append({'student_name':data['student_name'],'lab_id':data['lab_id'],'row_data_list':[]})
for i in range(len(row['row_data_list'])):
data = row['row_data_list'][i]
lab_data_by_student[i]['row_data_list'].append({'row_name':row['row_name'],'row_data':data['row_data']})
print('\n\n\n')
print(lab_ids)
print('\n\n\n')
print(lab_data)
print(lab_data_by_student)
print(lab_ids)
print(err_msg)
print('\n\n\n')
return render_template('admin_edit_data.html',lab_data=lab_data,student_data=lab_data_by_student,lab_id=lab_id,err_msg=err_msg)
admin_select_lab_for_data.html
{% extends "admin_home.html" %}
{% block head %}
<meta charset="UTF-8">
<title>Select lab for data</title>
<script>
$(document).ready(function(){
$('button[name=go_to_lab]').click(function(){
var lab_ids = [];
var checkboxes = document.getElementsByTagName('input')
for (var i = 0; i < checkboxes.length; i++) {
if (checkboxes[i].type == 'checkbox' && checkboxes[i].checked) {
lab_ids.push($(checkboxes[i]).data('labid'));
}
}
if (lab_ids.length==0){
$('#error_message_no_lab_choose').show().delay(1000).fadeOut();
}
else{
$.ajax({
type: 'POST',
contentType: 'application/json',
dataType: 'json',
url: 'http://127.0.0.1:5000/admin_select_lab_for_data',
data: JSON.stringify({'lab_ids':lab_ids}),
success: function(result){
alert('Submit successfully');
},
error : function(result){
alert('Fail to submit');
console.log(result)
}
});
}
});
});
</script>
{% endblock %}
{% block content %}
{% if (lab_list|length)==0 %}
No lab exists<br>
{% else %}
<table class="table">
<thead>
<tr>
<th class="tg-yw4l">Lab Index</th>
<th class="tg-yw4l">Lab Name</th>
<th class="tg-yw4l">Class Name</th>
<th class="tg-yw4l">Professor Name</th>
<th class="tg-yw4l">Number of data available</th>
<th class="tg-yw4l">Choose</th>
</tr>
</thead>
<tbody>
{% for lab in lab_list %}
<tr>
<th class="tg-yw4l">{{loop.index}}</th>
<td class="tg-yw4l">{{lab.lab_name}}</td>
<td class="tg-yw4l">{{lab.class_name}}</td>
<td class="tg-yw4l">{{lab.prof_name}}</td>
<td class="tg-yw4l">{{lab.data_num}}</td>
<td class="tg-yw4l"><input type="checkbox" data-labid="{{lab.lab_id}}"></td>
</tr>
{% endfor %}
</tbody>
</table>
<br>
<button name="go_to_lab">Go to lab</button>
<div class="temporary_message" id="error_message_no_lab_choose">You need to select one lab</div>
{% endif %}
{% endblock %}
admin_edit_data.html
{% extends "admin_home.html" %}
{% block head %}
<meta charset="UTF-8">
<title>Edit Data</title>
{% endblock %}
{% block content %}
{% if lab_data|length==0 %}
<h1> No data available for this lab </h1>
{% elif err_msg!="" %}
<h1> {{err_msg}} <h1>
{% else %}
<table class="table" id={{lab_id}} name={{lab_data|length}}>
<thead>
<tr>
<th>Index</th>
<th>Student Name</th>
<th>Lab ID</th>
{% for r in lab_data %}
<th>{{r["row_name"]}}</th>
{% endfor %}
</tr>
</thead>
<tbody>
{% for s in student_data %}
<tr>
<th>{{loop.index}}</th>
<td><input value={{s["student_name"]}}></td>
<td>{{s["lab_id"]}}</td>
{% for i in range(lab_data|length) %}
<td><input value={{s["row_data_list"][i]["row_data"]}}></td>
{% endfor %}
<td><button name=save_all>Save All</button></td>
<td><button name=delete>Delete</button></td>
</tr>
{% endfor %}
</tbody>
</table>
<button><a href="/admin_select_lab_for_data">Return</a></button>
{% endif%}
{% endblock %}
答案 0 :(得分：3)
由于Ajax发布请求，您永远无法实现页面重定向。
您必须提交常规表单帖子并进行重定向，或者您需要从Ajax调用返回结果并使用window.location在浏览器中更改页面。