from flask import (
Flask,
render_template,
request
)
app = Flask(__name__)
@app.route('/', methods=['GET', 'POST'])
def index():
if request.method == 'POST':
print(request.form.get('value', type=float))
return render_template('index.html')<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<link
rel="stylesheet"
href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css"
integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3"
crossorigin="anonymous">
<style>
/*
Toggle the appearance of the row containing an input field whose property
has been set to disabled.
*/
div.row:has(input.value-control[disabled]) {
display: none;
}
</style>
</head>
<body>
<div class="container my-4">
<form method="post">
<div class="row mb-3">
<!-- The button group to switch between the form parts. -->
<div class="col btn-group" role="group" aria-label="Basic radio toggle button group">
<!-- The data-target and data-parent properties reference the parts to be switched. -->
<input
id="btnradio1"
class="btn-check"
name="btnradio"
type="radio"
autocomplete="off"
data-parent=".value-control"
data-target="#value-control-1"
checked
>
<label class="btn btn-outline-primary" for="btnradio1">100-200 Mhz</label>
<input
id="btnradio2"
class="btn-check"
name="btnradio"
type="radio"
autocomplete="off"
data-parent=".value-control"
data-target="#value-control-2"
>
<label class="btn btn-outline-primary" for="btnradio2">400-500 Mhz</label>
</div>
</div>
<div class="row mb-3">
<label for="value-control-1" class="col-sm-2 col-form-label">Value:</label>
<div class="col-sm-10">
<!--
The references of the radio buttons refer to the class and id attributes
of the input field.
-->
<input
id="value-control-1"
class="form-control value-control"
name="value"
type="number"
step="0.001" min="100" max="200"
placeholder="xxx.xxx 100-200"
required
>
</div>
</div>
<div class="row mb-3">
<label for="value-control-2" class="col-sm-2 col-form-label">Value:</label>
<div class="col-sm-10">
<input
id="value-control-2"
class="form-control value-control"
name="value"
type="number"
step="0.001" min="400" max="500"
placeholder="xxx.xxx 400-500"
required
disabled
>
</div>
</div>
<div class="d-grid">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
</form>
</div>
<script
src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"
integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p"
crossorigin="anonymous"></script>
<script type="text/javascript">
(() => {
// Wait for the document content to load. This listener is not absolutely
// necessary at this point, since the script element is at the end of the document.
window.addEventListener('DOMContentLoaded', () => {
// Select the toggle buttons based on their properties.
const radioSel = 'input[name="btnradio"][data-target][data-parent]';
const radioBtns = document.querySelectorAll(radioSel);
radioBtns.forEach(btn => {
// Register a listener for the change event for each element found.
btn.addEventListener('change', evt => {
// Change the disabled property of the referenced elements.
const parent = document.querySelectorAll(evt.target.dataset.parent);
const target = document.querySelector(evt.target.dataset.target);
parent.forEach(elem => elem.disabled = true );
target && (target.disabled = !evt.target.checked);
});
});
});
})();
</script>
</body>
</html>