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I am new to Flask and want to create a On/Off toggle button on my website. I was wondering if and how this is possible also including a dynamic label. The following picture shows what I have in mind:
I was thinking about using a wtfforms SubmitField but I don't quite know how to implement this dynamic behavior between my routes.py file and my html template. I was thinking something like this:
forms.py:
from flask_wtf import FlaskForm
from wtforms import SubmitField
class PowerSwitchForm(FlaskForm):
power_switch = SubmitField("ON")
routes.py:
from flask import render_template, flash, redirect, url_for
from app import app
from app.forms import PowerSwitchForm
@app.route('/power', methods=['GET', 'POST'])
def power():
power_switch = PowerSwitchForm()
if power_switch.power_switch.label.text == "ON" and power_switch.validate():
flash("Power has been turned ON")
power_switch.power_switch.label.text = "OFF"
return redirect(url_for('power')
elif power_switch.power_switch.label.text == "OFF" and power_switch.validate():
flash("Power has been turned OFF")
power_switch.power_switch.label.text = "ON"
return redirect(url_for('power')
return render_template('power.html', form0=power_switch)
power.html:
<!DOCTYPE html>
{% extends "base.html" %}
{% block content %}
<h2>Power switch</h2>
<form action="" method="post" novalidate>
{{ form0.hidden_tag() }}
{{ form0.power_switch() }}
</form>
{% endblock %}
354
In the Flask code you can add an action under every if statement of the corresponding button like rendering a template or running a python script. In the HTML code you can add as many buttons as you want just be sure to add the right values and names. Streamlit is our favorite way to create python web apps due to its simplicity.
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However, this can be solved using the flask with something called dynamic routing . We shall now look at a better approach using Variable Rules. We will add a <variable name> with each route. Optionally, we can also define the converter with each variable name <converter: variable name>. By default, the converter is String.
You can use jquery to handle the desired operation when the toggle button is clicked. Also, if there is a backend process that should be performed when the button is toggled, ajax can be used. This answer demonstrates both. bootstrap-toggle is a library that enables simple implementation of a toggle. To use, copy the header tag values below:
<html>
<body>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
<link href="https://gitcdn.github.io/bootstrap-toggle/2.2.2/css/bootstrap-toggle.min.css" rel="stylesheet">
<script src="https://gitcdn.github.io/bootstrap-toggle/2.2.2/js/bootstrap-toggle.min.js"></script>
</head>
<input type="checkbox" class='toggle' checked data-toggle="toggle">
<div class='status'>Toggled</div>
</body>
<script>
$(document).ready(function() {
$('.toggle').click(function() {
var current_status = $('.status').text();
if (current_status === 'Untoggled'){
$('.status').html('Toggled');
}
else{
$('.status').html('Untoggled');
}
});
});
</script>
</html>
In the template, slightly change the script:
<script>
$(document).ready(function() {
$('.toggle').click(function() {
var current_status = $('.status').text();
$.ajax({
url: "/get_toggled_status",
type: "get",
data: {status: current_status},
success: function(response) {
$(".status").html(response);
},
error: function(xhr) {
//Do Something to handle error
}
});
});
});
</script>
Then, in your app, create a route /get_toggled_status:
@app.route('/get_toggled_status')
def toggled_status():
current_status = flask.request.args.get('status')
return 'Toggled' if current_status == 'Untoggled' else 'Untoggled'
This example does the same thing as the pure html/jquery solution, however, it does demonstrate how the backend can be communicated with when using the toggle.
61
I am also new to Flask. And here is the pure python code with flask that I've tried. Looks it work.
in templates/demo.html :
{% extends "bootstrap/base.html" %}
{% import "bootstrap/wtf.html" as wtf %}
{% block content %}
<div class="page-header">
{{ wtf.quick_form(form) }}
</div>
{% endblock %}
in demo.py :
from flask import Flask, render_template, redirect, url_for
from flask_bootstrap import Bootstrap
from flask_wtf import FlaskForm
from wtforms import SubmitField
class PowerState(FlaskForm) :
state = SubmitField('OFF')
app = Flask(__name__)
Bootstrap(app)
app.config['SECRET_KEY'] = 'YOUR SECRET KEY'
@app.route('/', methods=['GET', 'POST'])
def home() :
form = PowerState()
if form.validate_on_submit() :
if form.state.label.text == 'OFF' :
PowerState.state = SubmitField('ON')
elif form.state.label.text == 'ON' :
PowerState.state = SubmitField('OFF')
return redirect(url_for('home'))
return render_template('demo.html', form=form)
then run : flask run
Regards, Alex.Wu
43
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