Why is my Flask request.form empty?

Accessing Posted Form Values in Flask

When handling form submissions in Flask, accessing posted values requires proper configuration and handling of the form elements. If request.form appears empty or accessing specific form values raises 400 errors, consider the following:

Setting Form Element Names

To successfully post form values, each input element should have a name attribute. This attribute determines the key under which the value will be accessible in the request.form dictionary. In the provided example:

<code class="html"><input id="my_input" type="text" value="{{ email }}"></code>

The input field lacks a name attribute, which is the reason for the empty request.form and 400 error when accessing request.form['my_input'].

Correcting the Form

To fix the issue, add a name attribute to the input field:

<code class="html"><input name="my_input" id="my_input" type="text" value="{{ email }}"></code>

With this modification, the form submission will include a my_input key in request.form, and you can access its value as:

<code class="python">print(request.form['my_input'])  # prints the value of the input field</code>

The above is the detailed content of Why is my Flask request.form empty?. For more information, please follow other related articles on the PHP Chinese website!