Question

我正在寻找一种简单的方法，用文本文件中的数据预先填充表单的字段。

以下是我的导入：

#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

我的表格有以下课程：

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)])

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)

用户可以访问表单并填写表单。正如您在视图中看到的那样，在用户提交其信息后，所有信息都存储在临时“temp1.txt”文件中。我想做的是让用户选择回到这个表格，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一次提交的临时文本文件中的信息。

我怎么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了该表单，则可以使用文件值完成相同的操作。

form = MainForm(read_file_in_correct_format())

其中read_file_in_correct_format方法返回对象{fieldname：value}。保存为JSON可能更好，因此您可以轻松地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())

Flask - 从文本文件中预填充字段

1 个答案: