How can I let a div fill 100% width if no other elements are beside it?

Question

I have simple markup like this (a tab menu):

   

          


        
                      

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Answer 1

You mean like flexbox?

.container {
  display: flex;
  height: 50px;
  margin-bottom: 1em;
}
[class*="tab"] {
  flex: 1;
  border: 1px solid red;
}

<div class="container">
  <div class="tab1"></div>
</div>

<div class="container">
  <div class="tab1"></div>
  <div class="tab2"></div>
</div>

<div class="container">
  <div class="tab1"></div>
  <div class="tab2"></div>
  <div class="tab3"></div>
</div>

Or CSS Tables

.container {
  display: table;
  height: 50px;
  width: 100%;
}
[class*="tab"] {
  display: table-cell;
  border: 1px solid red;
}

<div class="container">
  <div class="tab1"></div>
</div>

<div class="container">
  <div class="tab1"></div>
  <div class="tab2"></div>
</div>

<div class="container">
  <div class="tab1"></div>
  <div class="tab2"></div>
  <div class="tab3"></div>
</div>

Answer 2

Depending on what browsers you need to support, you may be able to use flexbox:

$('.tab').click(function() {
  $(this).css('display', 'none');
});

.container {
  display: flex;
}

.tab {
  border: 1px solid black;
  padding: 5px;
  flex: 1;
  margin: 5px;
}

<p>Click a tab to remove it</p>
<div class="container">
   <div class="tab">Tab 1</div>
   <div class="tab">Tab 2</div>
   <div class="tab">Tab 3</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Answer 3

You can use display:table and display:table-cell see below code

HTML:

<div class="container">
   <div class="tab">Tab 1</div>
   <div class="tab">Tab 2</div>
   <div class="tab">Tab 3</div>
</div>

CSS:

.container {
  display: table;
  width:100%;
}

.tab {
  border: 1px solid black;
  padding: 5px;
  display: table-cell;
  margin: 5px;
}