Description

The script element contains JavaScript code that is executed when the application is loaded. This element must be at the canvas level; that is, it cannot be contained within any subordinate tag. If the src attribute is present, it names a JavaScript file whose contents are compiled into the application.

In the example below, we add a method to the built-in Array class that will let us find the index of elements in an array. Note that Array.find uses === for finding, so that two objects that are similar will not be confused. This is why looking for {example: 'sneaky'} finds nothing, whereas looking for sneaky succeeds.

 <canvas debug="true" height="200" width="400">
   <script>
   <![CDATA[
     // Add a find method to Array
     Array.prototype.find = function ( what ) {
       for (i in this ) {
         if (this[i] === what) {
           return i;
         }       
       }
     }
     
     sneaky = {example: 'sneaky'};
     tryit = ['foo', 42, sneaky, Math.PI, false];
     
     Debug.write("42 is at: " + tryit.find(42));
     Debug.write("false is at: " + tryit.find(false));
     Debug.write("'bar' is at: " + tryit.find('bar'));        
     Debug.write("{example: 'sneaky'} is at: " + tryit.find({example: 'sneaky'}));        
     Debug.write("sneaky is at: " + tryit.find(sneaky));        
   ]]>
   </script>
 </canvas>
 

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JavaScript Synopsis