How to Prevent a Button from Submitting a Form in Firefox?

Preventing Form Submission with Buttons

When working with forms, it's sometimes necessary to add buttons that perform specific actions without triggering the form's submission. In this article, we'll delve into the issue of how to prevent a specific button, like the "remove" button in the provided code snippet, from submitting the form in Firefox while allowing other buttons to do so.

Problem Statement

In the given HTML form, the "add" button functions correctly, while the "remove" button submits the form upon being clicked. This behavior is specific to Firefox and arises because of the default behavior of HTML5 button elements.

Understanding the Issue

HTML5 button elements inherit a default type of "submit," according to the W3 specifications. This means that unless explicitly specified otherwise, buttons have the inherent behavior of submitting their containing form.

Solution: Overriding the Default Type

To prevent the "remove" button from submitting the form, it's necessary to override its default type. This can be achieved by explicitly specifying the type as "button":

<button type="button" onclick="removeItem(); return false;">Remove Last Item</button>

By setting the type attribute to "button," we instruct the button to behave like a standard button element and not submit the form. However, we also need to include an additional return statement:

return false;

This return statement prevents the button's default action (which is to submit the form) from occurring. Combining these two elements ensures that the "remove" button triggers the desired JavaScript function without submitting the form.

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