Width of inputs in inline form - Bootstrap 4

Question

Good morning, I am trying to set up a inline form with inputs of different widths using Bootstrap 4. I have tried the different options available here: http://v4-alpha.getbootstrap.com/components/forms/.

This is as far as I went:

<div class="container">
    <div class="row">
        <div class="col-xs-1">
            <label for="exampleInputName2" class="col-form-label">Name</label>
        </div>
        <div class="col-xs-2">
            <input type="text" class="form-control" placeholder=".col-xs-2">
        </div>
        <div class="col-xs-3">
            <input type="text" class="form-control" placeholder=".col-xs-3">
        </div>
        <div class="col-xs-4">
            <input type="text" class="form-control" placeholder=".col-xs-4">
        </div>
    </div>
</div> 

But I am not using any form classes or tags.

---------------- EDIT ------------------------

To be more specific, how would you specify the widths of labels and inputs in this example coming from the Bootstrap 4 website?

<form class="form-inline">
  <div class="form-group">
    <label for="exampleInputName2">Name</label>
    <input type="text" class="form-control" id="exampleInputName2" placeholder="Jane Doe">
  </div>
  <div class="form-group">
    <label for="exampleInputEmail2">Email</label>
    <input type="email" class="form-control" id="exampleInputEmail2" placeholder="[email protected]">
  </div>
  <button type="submit" class="btn btn-primary">Send invitation</button>
</form>

Any good and simple example would be welcome.

Thanks

Sylvain

Answer 1

you could also use the Bootstrap 4 width utilities : (.w-25, .w-50, .w-75, .w-100, .mw-100)

<input type="some_type" class="form-control w-25">

Answer 2

See the example below, if you want to use bootstrap v4 grid widths along with the form-inline

<form class="form-inline">
  <div class="form-group row">
    <div class="col-md-5">
      <p class="form-control-static">[email protected]</p>
    </div>
    <div class="col-md-5">
      <input type="password" class="form-control" id="inputPassword2" placeholder="Password">
    </div>
    <div class="col-md-2">
      <button type="submit" class="btn btn-primary">Confirm identity</button>
    </div>
  </div>
</form>

Check the fiddle for more details: https://jsfiddle.net/dx0dzaqj/1/