The functionality of the Flask form is being hindered by the Materialize button class

Struggling to build a website with Flask and Materialize. Every time I attempt to use the button's class from Materialize, the form action fails to work properly. All of my efforts to resolve the issue only result in altering the image style that I intended to use. Is this just simply not achievable, or am I overlooking something crucial?

This is the code for the application:

@application.route("/test",methods=['GET', 'POST'])
def test():
    if request.method =='POST':
        print("It worked")
    return render_template("test.html", the_title="Test")

And here is the HTML file:

{% extends 'main.html' %}

{% block body %}

<form action="{{ url_for('test') }}" method="post">
    <!--This works-->
    <button name="test1" type="submit">Test1</button>

    <!--This doesn't work-->
    <a class="btn-large light-blue lighten-1"><Test2</a>
</form>

{% endblock %}

Answer №1

We have identified a minor error in the code snippet - an additional < before the link text. The corrected version should appear as follows:

<a class="btn-large light-blue lighten-1">Test2</a>

However, rectifying this alone will not render the link functional. To establish a working link, you must incorporate an href attribute. As shown below:

<a href="/test" class="btn-large light-blue lighten-1">Test2</a></answer1>
<exanswer1><div class="answer accepted" i="65535083" l="4.0" c="1609537626" v="1" a="Y29zdGFwYXJhcw==" ai="14722562">
<p>The initial issue is a small typographical mistake - an extra <code>< before the link text. It should read as follows:

<a class="btn-large light-blue lighten-1">Test2</a>

Even after correction, the link will not be fully functional. An inclusion of the href attribute is necessary for the link to direct to a specific location. For instance:

<a href="/test" class="btn-large light-blue lighten-1">Test2</a>

In this setup, a GET request to the /test route would be made rather than directly submitting the form.

I recommend consulting the Materialize documentation on buttons here:

When you use a button to submit a form, instead of using an input tag, use a button tag with a type submit

To submit a form accurately, it is advisable to utilize a regular button over an a (hyperlink) tag. Despite their visual similarity when styled with Materialize classes, a button is best suited for form submission tasks.

If desired, an a tag can be used for form submission by incorporating JavaScript to add an event listener, which triggers the form submission upon click event.

An illustrative demonstration encompassing various possibilities is provided below.

  • The first button functions as a standard HTML button that submits the form
  • The second button showcases similar functionality but includes Materialize styling
  • The first link initiates a GET request rather than submitting the form
  • The second link facilitates form submission through an event listener that alters its default behavior

document.getElementById('link2').addEventListener('click', (e) => {
  e.currentTarget.parentNode.submit();
});
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>

<form action="{{ url_for('test') }}" method="POST">

  <!-- This is a plain HTML button -->
  <button type="submit" id="btn1">Test1</button>

  <!-- This is a materialize button -->
  <button class="btn-large light-blue lighten-1" type="submit" id="btn2">Test2</button>

  <!-- These are links with materialize style -->
  <a class="btn-large light-blue lighten-1" id="link1" href="/test">Test3</a>
  <a class="btn-large light-blue lighten-1" id="link2">Test4</a>

</form>

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