prevent button submit form onclick

Question

I have a problem on html button tag

This my html code

<form name="data_kirim" action="confirm_order.php" method="POST">

        ..... order input field ....

    <button class="back_button" onclick="window.location.href='keranjang.php'">Back</button>
    <input class="next_button" type="submit" name="submit_data_kirim" value="Next"/>
</form>

How to prevent button to submit this form, because button is using the href to back page,

Can someone help me?

Answer 1

change

type='submit'

to

type='button'