Perfect 100% width of parent container for a Bootstrap input?

How do I make a Bootstrap input field be exactly 100% as wide as its parent?

As steve-obrien wrote in Bootstrap Issue #1058:

> Setting to 100% does not work when applied directly to an input field as it does not take in to account the padding. So you end up with 100% of the container plus the padding on the input box, so the input box usually breaks outside its container.

That ticket offers various solutions, but I'm looking for the best way to do it -- preferably a CSS class already provided by Bootstrap.

Applying the input-block-level class works great for me, across various screen widths. It is defined by Bootstrap in mixins.less as follows:

// Block level inputs
.input-block-level {
  display: block;
  width: 100%;
  min-height: 28px;        // Make inputs at least the height of their button counterpart
  .box-sizing(border-box); // Makes inputs behave like true block-level elements
}

This is very similar to the style suggested by 'assembler' in his comment on issue #1058.

Just add box-sizing:

input[type="text"] {
    box-sizing: border-box;
}

If you're using C# ASP.NET MVC's default template you may find that site.css overrides some of Bootstraps styles. If you want to use Bootstrap, as I did, having M$ override this (without your knowledge) can be a source of great frustration! Feel free to remove any of the unwanted styles...

/* Set width on the form input elements since they're 100% wide by default */
input,
select,
textarea {
    max-width: 280px;
}

For anyone Googling this, one suggestion is to remove all the input-group class instances. Worked for me in a similar situation. Original code:

<form>
  <div class="bs-callout">
    <div class="row">
      <div class="col-md-4">
        <div class="form-group">
          <div class="input-group">
            <input type="text" class="form-control" name="time" placeholder="Time">
          </div>
        </div>
      </div>
      <div class="col-md-8">
        <div class="form-group">
          <div class="input-group">
            <select name="dtarea" class="form-control">
              <option value="1">Option value 1</option>
            </select>
          </div>
        </div>
      </div>
    </div>
    <div class="row">
      <div class="input-group">
        <input type="text" name="reason" class="form-control" placeholder="Reason">
      </div>
    </div>
  </div>
</form>

New code:

<form>
  <div class="bs-callout">
    <div class="row">
      <div class="col-md-4">
        <div class="form-group">
          <input type="text" class="form-control" name="time" placeholder="Time">
        </div>
      </div>
      <div class="col-md-8">
        <div class="form-group">
          <select name="dtarea" class="form-control">
            <option value="1">Option value 1</option>
          </select>
        </div>
      </div>
    </div>
    <div class="row">
      <input type="text" name="reason" class="form-control" placeholder="Reason">
    </div>
  </div>
</form>

I found a solution that worked in my case:

<input class="form-control" style="min-width: 100%!important;" type="text" />

You only need to override the min-width set 100% and important and the result is this one:

If you don't apply it, you will always get this:

In order to get the desired result, you must set "box-sizing: border-box" vs. the default which is "box-sizing: content-box". This is precisely the issue you are referring to (From MDN):

content-box

This is the initial and default value as specified by the CSS standard. The width and height properties are measured including only the content, but not the padding, border or margin.

border-box

The width and height properties include the content, the padding and border, but not the margin."

---

Reference: https://developer.mozilla.org/en-US/docs/Web/CSS/box-sizing

Compatibility for this CSS is good.

Use .container-fluid, if you want to full-width as parent, spanning the entire width of your viewport.

What about?

    input[type="text"] {
          max-width:none;
   }

Checking that some css file is causing problems. By default bootstrap displays over the entire width. For instance in MVC directory Content is site.css and there is a definition constraining width.

input,select,textarea {
max-width: 280px;}

just add:

width: 100% !important;