Bootstrap - Retain Button Styling when implementing Forms - css

Question

I am using a Bootstrap Template (INSPINIA), and integrating it with PHP.
All of the sample data structures use buttons, but to make these interact with the server I need to change them to a submit and wrap them in a form.
Can I best retain the original bootstrap styling of a button, but gain the functionality of a form submit without having to amend bootstraps own CSS?
Original Bootstrap code:
<div class="input-group">
<input type="text" placeholder="Add new task. " class="input input-sm form-control">
<span class="input-group-btn">
<button type="button" class="btn btn-sm btn-white"> <i class="fa fa-plus"></i> Add task</button>
</span>
</div>
What I have ended up with:
<div class="input-group">
<form action="index.php" method="post">
<span class="input-group-btn">
<input type="text" placeholder="Add new task. " name="ToDo" class="input input-sm form-control">
<input type="submit" class="btn btn-sm btn-white" value="Add Task" name="addToDo" />
</span>
</form>
</div>
The above code doesn't look the same and shows some odd behaviour on smaller devices.

Answer 1

You can just change the type of the button to submit, and you're good to go:
<div class="input-group">
<input type="text" placeholder="Add new task. " class="input input-sm form-control">
<span class="input-group-btn">
<button type="submit" class="btn btn-sm btn-white"> <i class="fa fa-plus"></i> Add task</button>
</span>
</div>
You have to add the form tag outside input-group to keep the styling:
<form action="index.php" method="post">
<div class="input-group">
<input type="text" placeholder="Add new task. " class="input input-sm form-control">
<span class="input-group-btn">
<button type="submit" class="btn btn-sm btn-white"> <i class="fa fa-plus"></i> Add task</button>
</span>
</div>
</form>