Prevent divs from wrapping when parent is too small

Question

How can I stop the divs inside of this parent div from wrapping instead of just being cut off?

Code:

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Answer 1

If I understand your intent correctly, you want the grey slider to 'fade into' the green square, leaving the green square where it is.

For this, you'll want to combine overflow: hidden in conjunction with position: absolute:

var slider = document.getElementById("slider");
var cont1 = document.getElementById("container1");

slider.addEventListener("input", function() {
  cont1.style.width = slider.value + "px";
}, false);

#green {
  position: absolute;
  left: calc(100px + 8px); /* Red offset + body margin */
}

.item {
  width: 100px;
  height: 100px;
  float: left;
}

.container {
  height: 100px;
  background-color: #ccc;
}

<p>use slider to change width of the container</p>
<input id="slider" type="range" max="500">
<div class="container" id="container1" style="width: 300px; overflow: hidden;">
  <div class="item" style="background-color: red;"></div>
  <div id="green" class="item" style="background-color: green;"></div>
</div>

Note that your provided code also has duplicate #item IDs, which is invalid markup. I've changed these to classes in my above example.

Answer 2

Instead of float consider inline-block and you will be able to use the with-space trick:

var slider = document.getElementById("slider"),
  cont1 = document.getElementById("container1"),
  cont2 = document.getElementById("container2");

slider.addEventListener("input", function() {
  cont1.style.width = slider.value + "px";
  cont2.style.width = slider.value + "px";
}, false);

#item {
  width: 100px;
  height: 100px;
  display: inline-block;
}

.container {
  height: 100px;
  background-color: #ccc;
  white-space: nowrap;
  font-size: 0; /*to avoid white-space between inline-block*/
}

<p>use slider to change width of the container</p>
<input id="slider" type="range" max="500">
<p>overflow: hidden</p>
<div class="container" id="container1" style="width: 300px; overflow: hidden;">
  <div id="item" style="background-color: red;"></div>
  <div id="item" style="background-color: green;"></div>
</div>

<p>overflow: visible</p>
<div class="container" id="container2" style="width: 300px; overflow: visible;">
  <div id="item" style="background-color: red;"></div>
  <div id="item" style="background-color: green;"></div>
</div>