Alessandro Lacava

Category: CSS

How to display an element to the center of the browser

Posted:   |   Categories: CSS, JavaScript, Programming

Sometimes you might need to display an element, for example a div, to the center of the browser. Here is an example of how you can do it using JavaScript and CSS.

  
function init() {
  // Reference to the element
  var loading = document.getElementById("loading");
  // The div's width, set within the CSS class
  var loadingWidth = loading.offsetWidth;
  // The div's width, set within the CSS class
  var loadingHeight = loading.offsetHeight;
  // The browser's body's width
  var documentWidth = document.body.clientWidth;
  // The browser's body's height
  var documentHeight = document.body.clientHeight;
  // Position the element absolutely
  loading.style.position = "absolute";
  // Center horizontally
  loading.style.left = (documentWidth - loadingWidth) / 2;
  // Center vertically
  loading.style.top = (documentHeight - loadingHeight) / 2;
}

This code supposes you have a div element within your page with id=“loading”, for example:

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How to add scrollbars to a block (e.g. a <div> element)

Posted:   |   Categories: CSS, Programming

If you need to customize a list box then the <select> HTML element might not be enough. In such a case you’d like to have something that simulates the <select> behaviour.

Here is the code to use to obtain a custom list box:

     
<html>
  <head>
  </head>
  
  <body>
    <div style="width: 200px; height: 200px; overflow: auto;">
      <table width="100%" height="100%">
        <script>
          for (var i = 0; i < 30; i++) {
            if (i % 2 == 0) {
              document.write(
              "<tr style='background-color:#0066ff; color: #ffffff'>" +
              "<td>JavaScript</td></tr>");
            }
            else {
              document.write(
              "<tr style='background-color:#ff6600; color: #ffffff'>" +
              "<td>JavaScript</td></tr>");
            }
          }
        </script>
      </table>
    </div>
  </body>
</html>

The key CSS element is overflow. If you use overflow: auto then the scrollbars are displayed only if they are needed. If you want to display them in any case then you need to use overflow: scroll.

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