Flask - 从文本文件中预填充字段

Question

我正在寻找一种简单的方法来使用文本文件中的数据预填充表单的字段。

这是我的导入：

#For Flask
from flask import Flask, render_template, flash, request, redirect, url_for, send_file 
#For Web Form
from wtforms import Form, TextField, TextAreaField, validators, StringField, SubmitField, SelectField, RadioField, IntegerField, DateTimeField, DecimalField, FloatField
from werkzeug.utils import secure_filename
import re #For Regex

我的表单有以下类：

class MainForm(Form):
    #Regex
    reEmail_comp = re.compile('^.+@.+\..+$')
    reJobname_comp = re.compile('[^\s]+[\w]+$')

    #Form Fields
    familyname = TextField('Family Name:',
    validators=[validators.DataRequired()])

    firstname = TextField('First Name:',
    validators=[validators.DataRequired()])

    email = TextField('Email:',
    validators=[validators.DataRequired(),
    validators.Length(min=3, max=51),
    validators.Regexp(regex=reEmail_comp)])

    # Copy List of Job Templates 
    list_job_name = list_job_templates

    # Create List of Tuples
    choices_list = list(zip(list_job_name,list_job_templates))

    # Generate string to be evaluate as analyses Radiofield
    radio_string = ("RadioField('Analysis Type:',"
    "validators=[validators.DataRequired()],choices="+str(choices_list)+")")

    # Attribute value to element as a variable
    locals()["analyses"] = eval(radio_string)

    jobname = TextField('Job Name:',
    validators=[validators.DataRequired(),
    validators.Length(min=3, max=100),
    validators.Regexp(regex=reJobname_comp)])

    jobdescription = TextAreaField('Job Description:',
    validators=[validators.Optional(),
    validators.Length(min=0, max=10000)])

还有以下观点：

@app.route('/home', methods=['GET', 'POST'])
def home():
    form = MainForm(request.form)

    print(form.errors)
    if request.method == 'POST':
        familyname=request.form['familyname']
        firstname=request.form['firstname']
        email=request.form['email']
        analyses=request.form['analyses']
        jobname=request.form['jobname']
        jobdescription=request.form['jobdescription']
        if jobdescription == "":
            jobdescription = "No Description"
        nextpage=request.form['submit'] #Get submission button value

        if form.validate():

            #Print Temp file
            print("||".join(["Family Name={}".format(familyname),
                    "First Name={}".format(firstname),"E-Mail={}".format(email),
                    "Analyse={}".format(analyses),"Job Name={}".format(jobname),
                    "Job Description={}".format(jobdescription)]),
                    file=open(submission_dir+"temp1", "w"))

            #Redirections following which button has been clicked
            if nextpage == 'Continue to Submission':
                return redirect(url_for('nextpage'))
            else:
                return redirect(url_for('nextbis'))

        else:
            flash('Error: Please make sure that all the fields are correctly filled.')


    return render_template('home.html', form=form)

用户有权访问表单并可以填写它。 正如您在视图中看到的，有一个步骤，在此步骤中，一旦用户提交信息，所有信息都将存储在临时“temp1.txt”文件中。
我想做的是让用户可以选择返回此表单，以防他想修改他之前提交的信息。

为了简化这一点，我希望表单显示相同的字段，但这次预先填充了上次提交的临时文本文件中的信息。

我怎样才能以简单的方式做到这一点？

Answer 1

如果您创建了一个表单并从请求中填充它，那么可以对文件值进行同样的操作。

form = MainForm(read_file_in_correct_format())

read_file_in_correct_format 方法返回对象 {fieldname:value}。保存为 JSON 可能会更好，这样您就可以轻松解析它并支持更复杂的结构。

您所要做的就是根据request.method正确初始化表单

@app.route('/home', methods=['GET', 'POST'])
def home():
    if request.method == 'POST':
        # so if form is submitted, populate it from request
        form = MainForm(request.form)
        ...
    else:
        # if we are just viewing form, then try to load stored values from temp1.txt
        form = MainForm(read_file_in_correct_format())