WTForms date validation

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I am currently trying to build a simple web application using Flask. With this i am also using WTForms, however i am having problem with getting date information from the fo

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攒了一身酷

2021-01-16 06:36

WTForm custom date validation compare two dates Start date and End date [Start date should not be greater than end date if so give error].

DateExample.py

    from flask import Flask, render_template
    from flask_wtf import FlaskForm
    from datetime import date
    from wtforms.fields.html5 import DateField
    from wtforms.fields.html5 import DateTimeField

    app = Flask(__name__)
    app.config['SECRET_KEY']='secretkey'

    class TestForm(FlaskForm):
        startdate = DateField('Start Date',default=date.today)
        enddate = DateField('End Date',default=date.today)

        def validate_on_submit(self):
            result = super(TestForm, self).validate()
            if (self.startdate.data>self.enddate.data):
                return False
            else:
                return result

    @app.route('/dateExample',methods=['GET','POST'])
    def index():
        error = None
        form = TestForm()
        if form.validate_on_submit():
            return 'Start Date is : {} End Date is : {}'.format(form.startdate.data, form.enddate.data)
        else:
            error = "Start date is greater than End date"
        return render_template('dateExample.html',form=form,error = error)

    if __name__ =="__main__":
        app.run(debug=True,port=5000)

DateExample.html

<html>
<body>
<h1> Flask WFForm </h1>

{% if error %}
<p><strong> Error: </strong></p> {{error}}
{% endif %}

<form method="POST" action="{{url_for('index')}}">
  {{ form.csrf_token }}
{{ form.startdate.label }}
   {{ form.startdate }}
{{ form.enddate.label }}
   {{ form.enddate }}
<input type="submit" value="Submit">
</form>
</body>
</html>

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