Flask, why does request.form runs error 400?
Question
I am trying to extract text from the following HTML code:
@app.route("/", methods=['GET', 'POST'])
def home():
if request.method == 'POST':
H_desiderata = float(request.form.get('H_desiderata')) #THIS CAUSES THE ERROR
return render_template('form1.html')
HTML below:
<body>
<h2>Brioche Recipe</h2>
<form>
<div class="grid-container">
<div class="grid-item">
<label class="text" for="H_desiderata">
H_desiderata:
</label><be>
<input type="number" id="H_desiderata" name="H_desiderata1"
value={{val_H_desiderata}} min="1" max="99" step="1"><br>
Before putting it into a grid it worked:
old working code:
<form>
<label for="H_desiderata">H_desiderata:</label><br>
<input type="number" id="H_desiderata" name="H_desiderata"
value={{val_H_desiderata}} min="1" max="99" step="1"><br>
How should I adapt request.form to return the value within the input box?
1 answers
solution1
1 ACCPTED 2020-08-04 00:02:03
There is so much wrong with your code, but let's start with this:
request.form is empty when request.method == "GET . So. request.form['H_desiderata'] will give a key error.
Move that to the POST section of your view. Also, use request.form.get('H_desiderata', -9999999) in case it's not defined.
UPDATE:
OK, now try:
if request.method == 'POST':
print(request.form)
print(request.form.get('H_desiderata'))
print(float(request.form.get('H_desiderata')))
H_desiderata = float(request.form.get('H_desiderata'))
Then, you are going to want:
return render_template('form1.html', val_H_desiderata=H_desiderata)
UPDATE2:
Your <form> tag is malformed. Try:
<form action="/" method="post">
UPDATE3:
You change the name of the input, so change to: request.form.get('H_desiderata1')
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.