November 12, 2016 11:28 · Nov 12, 2016
diff --git a/addclass.html b/addclass.html
@@ -0,0 +1,41 @@
+<html>
+    <head>
+        <title>Flask FieldList Demo</title>
+    </head>
+    <body>
+        <h1>Add Class</h1>
+        {% if fileform %}
+        <div>
+            <p>Add class from file:</p>
+            <form action="" method="post" enctype="multipart/form-data" name="fileform">
+                {{ fileform.hidden_tag() }}
+                <p><input type="submit" name="upload" value="Upload"></p>
+            </form>
+        </div>
+        <hr>
+        {% endif %}
+        <div>
+            <form action="" method="post" name="classform">
+                {{ classform.hidden_tag() }}
+                Class Name: {{ classform.name }}<br>
+                Day: {{ classform.day }}<br>
+                <br>
+                <div>
+                    <table>
+                        <tr>
+                            <th> Student Number </th>
+                            <th> Name </th>
+                        </tr>
+                        {% for student in classform.students %}
+                        <tr>
+                            <td>{{ student.student_id }}</td>
+                            <td>{{ student.student_name }}</td>
+                        </tr>
+                        {% endfor %}
+                    </table>
+                </div>
+                <p><input type="submit" name="addclass" value="Add Class"></p>
+            </form>
+        </div>
+    </body>
+</html>
diff --git a/app.py b/app.py
@@ -0,0 +1,70 @@
+from flask import Flask, render_template, request, url_for
+from flask.ext.wtf import Form
+from wtforms import StringField, FieldList, FormField, SelectField
+from wtforms.validators import DataRequired
+from werkzeug.datastructures import MultiDict
+
+app = Flask(__name__)
+app.config['SECRET_KEY']='asdfjlkghdsf'
+
+# normally student data is read in from a file uploaded, but for this demo we use dummy data
+student_info=[("123","Bob Jones"),("234","Peter Johnson"),("345","Carly Everett"),
+              ("456","Josephine Edgewood"),("567","Pat White"),("678","Jesse Black")]
+
+class FileUploadForm(Form):
+    pass
+
+class StudentForm(Form):
+    student_id = StringField('Student ID', validators = [DataRequired()])
+    student_name = StringField('Student Name', validators = [DataRequired()])
+
+class AddClassForm(Form):
+    name = StringField('classname', validators=[DataRequired()])
+    day = SelectField('classday', 
+                      choices=[(1,"Monday"),(2,"Tuesday"),(3,"Wednesday"),(4,"Thursday"),(5,"Friday")],
+                      coerce=int)
+
+    students = FieldList(FormField(StudentForm), min_entries = 5) # show at least 5 blank fields by default
+
+@app.route('/', methods=['GET', 'POST'])
+def addclass():
+    fileform = FileUploadForm()
+    classform = AddClassForm()
+
+    # Check which 'submit' button was called to validate the correct form
+    if 'addclass' in request.form and classform.validate_on_submit():
+        # Add class to DB - not relevant for this example.
+        return redirect(url_for('addclass'))
+
+    if 'upload' in request.form and fileform.validate_on_submit():
+        # get the data file from the post - not relevant for this example.
+        # overwrite the classform by populating it with values read from file
+        classform = PopulateFormFromFile()
+        return render_template('addclass.html', classform=classform)
+
+    return render_template('addclass.html', fileform=fileform, classform=classform)
+
+def PopulateFormFromFile():
+    classform = AddClassForm()
+
+    # normally we would read the file passed in as an argument and pull data out, 
+    # but let's just use the dummy data from the top of this file, and some hardcoded values
+    classform.name.data = "Super Awesome Class"
+    classform.day.data = 4 # Thursday
+
+    # pop off any blank fields already in student info
+    while len(classform.students) > 0:
+        classform.students.pop_entry()
+
+    for student_id, name in student_info:
+        studentform = StudentForm()
+        studentform.student_id = student_id
+        studentform.student_name = name
+
+        classform.students.append_entry(studentform)
+
+    return classform
+
+
+if __name__ == '__main__':
+    app.run(debug=True, port=5001)