Tech Tips

Search for Class Name

This function scan array a and returns an array of indexes to all elements with class name cn.

<SCRIPT LANGUAGE="JavaScript">
  
   function FindClassName(a,cn) {
        r = new Array();
        j = 0;
        n = a.length;
        for (var i=0; i < n; ++i ) {
          s = a[i];
          if ( s.className == cn) {
            r[j] = i;
            j = j + 1; 
          }
        }
       return r;
   }

</SCRIPT>

Usage example: First the function is called to get an array of all images with class name MyClass. Then one can navigate by index thru all these images to set image img.

<SCRIPT LANGUAGE="JavaScript">

   imgs = FindClassName(document.images,"MyClass");

// navigation

   img.src = document.images[imgs[index]].src;

</SCRIPT>